pax_global_header00006660000000000000000000000064130447531150014515gustar00rootroot0000000000000052 comment=1fed13096def5c04de0f3d18c8700f09e3ac897f prometheus-postgres-exporter-0.1.1+ds/000077500000000000000000000000001304475311500200235ustar00rootroot00000000000000prometheus-postgres-exporter-0.1.1+ds/.gitignore000066400000000000000000000001401304475311500220060ustar00rootroot00000000000000.build postgres_exporter postgres_exporter_integration_test *.tar.gz *.test *-stamp .idea *.iml prometheus-postgres-exporter-0.1.1+ds/.travis.yml000066400000000000000000000074471304475311500221500ustar00rootroot00000000000000sudo: required services: - docker language: go go: - '1.7' # Make sure we have p2 and the postgres client. before_install: - sudo wget -O /usr/local/bin/p2 https://github.com/wrouesnel/p2cli/releases/download/r4/p2 && sudo chmod +x /usr/local/bin/p2 - sudo wget -O /usr/local/bin/docker-compose https://github.com/docker/compose/releases/download/1.9.0-rc4/docker-compose-Linux-x86_64 && sudo chmod +x /usr/local/bin/docker-compose - sudo apt-get update && sudo apt-get install postgresql-client-common script: - make all - make docker - make test-integration after_success: - docker login -e $DOCKER_EMAIL -u $DOCKER_USER -p $DOCKER_PASS # Push a tagged build if a tag is found. - if [ ! -z "$TRAVIS_TAG" ]; then docker tag wrouesnel/postgres_exporter:latest wrouesnel/postgres_exporter:$TRAVIS_TAG ; fi # Push a latest version - if [ "$TRAVIS_BRANCH" == "master" ]; then docker push wrouesnel/postgres_exporter ; fi env: global: - secure: 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 - secure: 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 - secure: 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 deploy: provider: releases api_key: secure: 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 file: postgres_exporter on: tags: true branch: master repo: wrouesnel/postgres_exporter prometheus-postgres-exporter-0.1.1+ds/Dockerfile000066400000000000000000000001521304475311500220130ustar00rootroot00000000000000FROM scratch COPY postgres_exporter /postgres_exporter EXPOSE 9187 ENTRYPOINT [ "/postgres_exporter" ] prometheus-postgres-exporter-0.1.1+ds/LICENSE000066400000000000000000000260751304475311500210420ustar00rootroot00000000000000Apache License Version 2.0, January 2004 http://www.apache.org/licenses/ TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 1. 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See the License for the specific language governing permissions and limitations under the License. prometheus-postgres-exporter-0.1.1+ds/Makefile000066400000000000000000000025631304475311500214710ustar00rootroot00000000000000 GO_SRC := $(shell find . -type f -name "*.go") CONTAINER_NAME ?= wrouesnel/postgres_exporter:latest all: vet test postgres_exporter # Simple go build postgres_exporter: $(GO_SRC) CGO_ENABLED=0 go build -a -ldflags "-extldflags '-static' -X main.Version=$(shell git describe --dirty)" -o postgres_exporter . postgres_exporter_integration_test: $(GO_SRC) CGO_ENABLED=0 go test -c -tags integration \ -a -ldflags "-extldflags '-static' -X main.Version=git:$(shell git describe --dirty)" -o postgres_exporter_integration_test . # Take a go build and turn it into a minimal container docker: postgres_exporter docker build -t $(CONTAINER_NAME) . vet: go vet . test: go test -v -cover . test-integration: postgres_exporter postgres_exporter_integration_test tests/test-smoke ./postgres_exporter ./postgres_exporter_integration_test # Do a self-contained docker build - we pull the official upstream container # and do a self-contained build. docker-build: postgres_exporter docker run -v $(shell pwd):/go/src/github.com/wrouesnel/postgres_exporter \ -v $(shell pwd):/real_src \ -e SHELL_UID=$(shell id -u) -e SHELL_GID=$(shell id -g) \ -w /go/src/github.com/wrouesnel/postgres_exporter \ golang:1.7-wheezy \ /bin/bash -c "make >&2 && chown $$SHELL_UID:$$SHELL_GID ./postgres_exporter" docker build -t $(CONTAINER_NAME) . .PHONY: docker-build docker test vet prometheus-postgres-exporter-0.1.1+ds/README.md000066400000000000000000000101251304475311500213010ustar00rootroot00000000000000[![Build Status](https://travis-ci.org/wrouesnel/postgres_exporter.svg?branch=master)](https://travis-ci.org/wrouesnel/postgres_exporter) # PostgresSQL Server Exporter Prometheus exporter for PostgresSQL server metrics. Supported Postgres versions: 9.1 and up. ## Quick Start This package is available for Docker: ``` # Start an example database docker run --net=host -it --rm -e POSTGRES_PASSWORD=password postgres # Connect to it docker run -e DATA_SOURCE_NAME="postgresql://postgres:password@localhost:5432/?sslmode=disable" -p 9187:9187 wrouesnel/postgres_exporter ``` ## Building and running The default make file behavior is to build the binary: ``` make export DATA_SOURCE_NAME="postgresql://login:password@hostname:port/dbname" ./postgres_exporter ``` To build the dockerfile, run `make docker`. This will build the docker image as `wrouesnel/postgres_exporter:latest`. This is a minimal docker image containing *just* postgres_exporter. By default no SSL certificates are included, if you need to use SSL you should either bind-mount `/etc/ssl/certs/ca-certificates.crt` or derive a new image containing them. ### Vendoring Package vendoring is handled with [`govendor`](https://github.com/kardianos/govendor) ### Flags * `web.listen-address` Address to listen on for web interface and telemetry. * `web.telemetry-path` Path under which to expose metrics. * `config.expect-replication-stats` The target database has replication turned on - log errors when replication stats are missing. ### Setting the Postgres server's data source name The PostgresSQL server's [data source name](http://en.wikipedia.org/wiki/Data_source_name) must be set via the `DATA_SOURCE_NAME` environment variable. For running it locally on a default Debian/Ubuntu install, this will work (transpose to init script as appropriate): sudo -u postgres DATA_SOURCE_NAME="user=postgres host=/var/run/postgresql/ sslmode=disable" postgres_exporter See the [github.com/lib/pq](http://github.com/lib/pq) module for other ways to format the connection string. ### Adding new metrics The exporter will attempt to dynamically export additional metrics if they are added in the future, but they will be marked as "untyped". Additional metric maps can be easily created from Postgres documentation by copying the tables and using the following Python snippet: ```python x = """tab separated raw text of a documentation table""" for l in StringIO(x): column, ctype, description = l.split('\t') print """"{0}" : {{ prometheus.CounterValue, prometheus.NewDesc("pg_stat_database_{0}", "{2}", nil, nil) }}, """.format(column.strip(), ctype, description.strip()) ``` Adjust the value of the resultant prometheus value type appropriately. This helps build rich self-documenting metrics for the exporter. ### Adding new metrics via a config file The -extend.query-path command-line argument specifies a YAML file containing additional queries to run. Some examples are provided in [queries.yaml](queries.yaml). ### Running as non-superuser To be able to collect metrics from pg_stat_activity and pg_stat_replication as non-superuser you have to create functions and views to do so. ```sql CREATE USER postgres_exporter PASSWORD 'password'; ALTER USER postgres_exporter SET SEARCH_PATH TO postgres_exporter,pg_catalog; CREATE SCHEMA postgres_exporter AUTHORIZATION postgres_exporter; CREATE FUNCTION postgres_exporter.f_select_pg_stat_activity() RETURNS setof pg_catalog.pg_stat_activity LANGUAGE sql SECURITY DEFINER AS $$ SELECT * from pg_catalog.pg_stat_activity; $$; CREATE FUNCTION postgres_exporter.f_select_pg_stat_replication() RETURNS setof pg_catalog.pg_stat_replication LANGUAGE sql SECURITY DEFINER AS $$ SELECT * from pg_catalog.pg_stat_replication; $$; CREATE VIEW postgres_exporter.pg_stat_replication AS SELECT * FROM postgres_exporter.f_select_pg_stat_replication(); CREATE VIEW postgres_exporter.pg_stat_activity AS SELECT * FROM postgres_exporter.f_select_pg_stat_activity(); GRANT SELECT ON postgres_exporter.pg_stat_replication TO postgres_exporter; GRANT SELECT ON postgres_exporter.pg_stat_activity TO postgres_exporter; ``` prometheus-postgres-exporter-0.1.1+ds/postgres_exporter.go000066400000000000000000001131521304475311500241530ustar00rootroot00000000000000package main import ( "database/sql" "errors" "flag" "fmt" "io/ioutil" "math" "net/http" "os" "regexp" "strconv" "sync" "time" "gopkg.in/yaml.v2" "github.com/blang/semver" _ "github.com/lib/pq" "github.com/prometheus/client_golang/prometheus" "github.com/prometheus/common/log" ) var Version string = "0.0.1" var ( listenAddress = flag.String( "web.listen-address", ":9187", "Address to listen on for web interface and telemetry.", ) metricPath = flag.String( "web.telemetry-path", "/metrics", "Path under which to expose metrics.", ) queriesPath = flag.String( "extend.query-path", "", "Path to custom queries to run.", ) onlyDumpMaps = flag.Bool( "dumpmaps", false, "Do not run, simply dump the maps.", ) ) // Metric name parts. const ( // Namespace for all metrics. namespace = "pg" // Subsystems. exporter = "exporter" // Metric label used for static string data thats handy to send to Prometheus // e.g. version staticLabelName = "static" ) // landingPage contains the HTML served at '/'. // TODO: Make this nicer and more informative. var landingPage = []byte(` Postgres exporter

Postgres exporter

Metrics

`) type ColumnUsage int // Implements the yaml.Unmarshaller interface func (this *ColumnUsage) UnmarshalYAML(unmarshal func(interface{}) error) error { var value string if err := unmarshal(&value); err != nil { return err } columnUsage, err := stringToColumnUsage(value) if err != nil { return err } *this = columnUsage return nil } const ( DISCARD ColumnUsage = iota // Ignore this column LABEL ColumnUsage = iota // Use this column as a label COUNTER ColumnUsage = iota // Use this column as a counter GAUGE ColumnUsage = iota // Use this column as a gauge MAPPEDMETRIC ColumnUsage = iota // Use this column with the supplied mapping of text values DURATION ColumnUsage = iota // This column should be interpreted as a text duration (and converted to milliseconds) ) // Special case matric mappings const ( // Which metric mapping should be acquired using "SHOW" queries SHOW_METRIC = "pg_runtime_variables" ) // Regex used to get the "short-version" from the postgres version field. var versionRegex = regexp.MustCompile(`^\w+ (\d+\.\d+\.\d+)`) var lowestSupportedVersion = semver.MustParse("9.1.0") // Parses the version of postgres into the short version string we can use to // match behaviors. func parseVersion(versionString string) (semver.Version, error) { submatches := versionRegex.FindStringSubmatch(versionString) if len(submatches) > 1 { return semver.Make(submatches[1]) } return semver.Version{}, errors.New(fmt.Sprintln("Could not find a postgres version in string:", versionString)) } // User-friendly representation of a prometheus descriptor map type ColumnMapping struct { usage ColumnUsage `yaml:"usage"` description string `yaml:"description"` mapping map[string]float64 `yaml:"metric_mapping"` // Optional column mapping for MAPPEDMETRIC supportedVersions semver.Range `yaml:"pg_version"` // Semantic version ranges which are supported. Unsupported columns are not queried (internally converted to DISCARD). } func (this *ColumnMapping) UnmarshalYAML(unmarshal func(interface{}) error) error { type plain ColumnMapping if err := unmarshal((*plain)(this)); err != nil { return err } return nil } // Groups metric maps under a shared set of labels type MetricMapNamespace struct { labels []string // Label names for this namespace columnMappings map[string]MetricMap // Column mappings in this namespace } // Stores the prometheus metric description which a given column will be mapped // to by the collector type MetricMap struct { discard bool // Should metric be discarded during mapping? vtype prometheus.ValueType // Prometheus valuetype desc *prometheus.Desc // Prometheus descriptor conversion func(interface{}) (float64, bool) // Conversion function to turn PG result into float64 } // Metric descriptors for dynamically created metrics. var variableMaps = map[string]map[string]ColumnMapping{ "pg_runtime_variable": map[string]ColumnMapping{ "max_connections": {GAUGE, "Sets the maximum number of concurrent connections.", nil, nil}, "max_files_per_process": {GAUGE, "Sets the maximum number of simultaneously open files for each server process.", nil, nil}, "max_function_args": {GAUGE, "Shows the maximum number of function arguments.", nil, nil}, "max_identifier_length": {GAUGE, "Shows the maximum identifier length.", nil, nil}, "max_index_keys": {GAUGE, "Shows the maximum number of index keys.", nil, nil}, "max_locks_per_transaction": {GAUGE, "Sets the maximum number of locks per transaction.", nil, nil}, "max_pred_locks_per_transaction": {GAUGE, "Sets the maximum number of predicate locks per transaction.", nil, nil}, "max_prepared_transactions": {GAUGE, "Sets the maximum number of simultaneously prepared transactions.", nil, nil}, //"max_stack_depth" : { GAUGE, "Sets the maximum number of concurrent connections.", nil }, // No dehumanize support yet "max_standby_archive_delay": {DURATION, "Sets the maximum delay before canceling queries when a hot standby server is processing archived WAL data.", nil, nil}, "max_standby_streaming_delay": {DURATION, "Sets the maximum delay before canceling queries when a hot standby server is processing streamed WAL data.", nil, nil}, "max_wal_senders": {GAUGE, "Sets the maximum number of simultaneously running WAL sender processes.", nil, nil}, }, } // TODO: revisit this with the semver system func dumpMaps() { for name, cmap := range metricMaps { query, ok := queryOverrides[name] if !ok { fmt.Println(name) } else { for _, queryOverride := range query { fmt.Println(name, queryOverride.versionRange, queryOverride.query) } } for column, details := range cmap { fmt.Printf(" %-40s %v\n", column, details) } fmt.Println() } } var metricMaps = map[string]map[string]ColumnMapping{ "pg_stat_bgwriter": map[string]ColumnMapping{ "checkpoints_timed": {COUNTER, "Number of scheduled checkpoints that have been performed", nil, nil}, "checkpoints_req": {COUNTER, "Number of requested checkpoints that have been performed", nil, nil}, "checkpoint_write_time": {COUNTER, "Total amount of time that has been spent in the portion of checkpoint processing where files are written to disk, in milliseconds", nil, nil}, "checkpoint_sync_time": {COUNTER, "Total amount of time that has been spent in the portion of checkpoint processing where files are synchronized to disk, in milliseconds", nil, nil}, "buffers_checkpoint": {COUNTER, "Number of buffers written during checkpoints", nil, nil}, "buffers_clean": {COUNTER, "Number of buffers written by the background writer", nil, nil}, "maxwritten_clean": {COUNTER, "Number of times the background writer stopped a cleaning scan because it had written too many buffers", nil, nil}, "buffers_backend": {COUNTER, "Number of buffers written directly by a backend", nil, nil}, "buffers_backend_fsync": {COUNTER, "Number of times a backend had to execute its own fsync call (normally the background writer handles those even when the backend does its own write)", nil, nil}, "buffers_alloc": {COUNTER, "Number of buffers allocated", nil, nil}, "stats_reset": {COUNTER, "Time at which these statistics were last reset", nil, nil}, }, "pg_stat_database": map[string]ColumnMapping{ "datid": {LABEL, "OID of a database", nil, nil}, "datname": {LABEL, "Name of this database", nil, nil}, "numbackends": {GAUGE, "Number of backends currently connected to this database. This is the only column in this view that returns a value reflecting current state; all other columns return the accumulated values since the last reset.", nil, nil}, "xact_commit": {COUNTER, "Number of transactions in this database that have been committed", nil, nil}, "xact_rollback": {COUNTER, "Number of transactions in this database that have been rolled back", nil, nil}, "blks_read": {COUNTER, "Number of disk blocks read in this database", nil, nil}, "blks_hit": {COUNTER, "Number of times disk blocks were found already in the buffer cache, so that a read was not necessary (this only includes hits in the PostgreSQL buffer cache, not the operating system's file system cache)", nil, nil}, "tup_returned": {COUNTER, "Number of rows returned by queries in this database", nil, nil}, "tup_fetched": {COUNTER, "Number of rows fetched by queries in this database", nil, nil}, "tup_inserted": {COUNTER, "Number of rows inserted by queries in this database", nil, nil}, "tup_updated": {COUNTER, "Number of rows updated by queries in this database", nil, nil}, "tup_deleted": {COUNTER, "Number of rows deleted by queries in this database", nil, nil}, "conflicts": {COUNTER, "Number of queries canceled due to conflicts with recovery in this database. (Conflicts occur only on standby servers; see pg_stat_database_conflicts for details.)", nil, nil}, "temp_files": {COUNTER, "Number of temporary files created by queries in this database. All temporary files are counted, regardless of why the temporary file was created (e.g., sorting or hashing), and regardless of the log_temp_files setting.", nil, nil}, "temp_bytes": {COUNTER, "Total amount of data written to temporary files by queries in this database. All temporary files are counted, regardless of why the temporary file was created, and regardless of the log_temp_files setting.", nil, nil}, "deadlocks": {COUNTER, "Number of deadlocks detected in this database", nil, nil}, "blk_read_time": {COUNTER, "Time spent reading data file blocks by backends in this database, in milliseconds", nil, nil}, "blk_write_time": {COUNTER, "Time spent writing data file blocks by backends in this database, in milliseconds", nil, nil}, "stats_reset": {COUNTER, "Time at which these statistics were last reset", nil, nil}, }, "pg_stat_database_conflicts": map[string]ColumnMapping{ "datid": {LABEL, "OID of a database", nil, nil}, "datname": {LABEL, "Name of this database", nil, nil}, "confl_tablespace": {COUNTER, "Number of queries in this database that have been canceled due to dropped tablespaces", nil, nil}, "confl_lock": {COUNTER, "Number of queries in this database that have been canceled due to lock timeouts", nil, nil}, "confl_snapshot": {COUNTER, "Number of queries in this database that have been canceled due to old snapshots", nil, nil}, "confl_bufferpin": {COUNTER, "Number of queries in this database that have been canceled due to pinned buffers", nil, nil}, "confl_deadlock": {COUNTER, "Number of queries in this database that have been canceled due to deadlocks", nil, nil}, }, "pg_locks": map[string]ColumnMapping{ "datname": {LABEL, "Name of this database", nil, nil}, "mode": {LABEL, "Type of Lock", nil, nil}, "count": {GAUGE, "Number of locks", nil, nil}, }, "pg_stat_replication": map[string]ColumnMapping{ "procpid": {DISCARD, "Process ID of a WAL sender process", nil, semver.MustParseRange("<9.2.0")}, "pid": {DISCARD, "Process ID of a WAL sender process", nil, semver.MustParseRange(">=9.2.0")}, "usesysid": {DISCARD, "OID of the user logged into this WAL sender process", nil, nil}, "usename": {DISCARD, "Name of the user logged into this WAL sender process", nil, nil}, "application_name": {DISCARD, "Name of the application that is connected to this WAL sender", nil, nil}, "client_addr": {LABEL, "IP address of the client connected to this WAL sender. If this field is null, it indicates that the client is connected via a Unix socket on the server machine.", nil, nil}, "client_hostname": {DISCARD, "Host name of the connected client, as reported by a reverse DNS lookup of client_addr. This field will only be non-null for IP connections, and only when log_hostname is enabled.", nil, nil}, "client_port": {DISCARD, "TCP port number that the client is using for communication with this WAL sender, or -1 if a Unix socket is used", nil, nil}, "backend_start": {DISCARD, "with time zone Time when this process was started, i.e., when the client connected to this WAL sender", nil, nil}, "backend_xmin": {DISCARD, "The current backend's xmin horizon.", nil, nil}, "state": {LABEL, "Current WAL sender state", nil, nil}, "sent_location": {DISCARD, "Last transaction log position sent on this connection", nil, nil}, "write_location": {DISCARD, "Last transaction log position written to disk by this standby server", nil, nil}, "flush_location": {DISCARD, "Last transaction log position flushed to disk by this standby server", nil, nil}, "replay_location": {DISCARD, "Last transaction log position replayed into the database on this standby server", nil, nil}, "sync_priority": {DISCARD, "Priority of this standby server for being chosen as the synchronous standby", nil, nil}, "sync_state": {DISCARD, "Synchronous state of this standby server", nil, nil}, "slot_name": {LABEL, "A unique, cluster-wide identifier for the replication slot", nil, semver.MustParseRange(">=9.2.0")}, "plugin": {DISCARD, "The base name of the shared object containing the output plugin this logical slot is using, or null for physical slots", nil, nil}, "slot_type": {DISCARD, "The slot type - physical or logical", nil, nil}, "datoid": {DISCARD, "The OID of the database this slot is associated with, or null. Only logical slots have an associated database", nil, nil}, "database": {DISCARD, "The name of the database this slot is associated with, or null. Only logical slots have an associated database", nil, nil}, "active": {DISCARD, "True if this slot is currently actively being used", nil, nil}, "active_pid": {DISCARD, "Process ID of a WAL sender process", nil, nil}, "xmin": {DISCARD, "The oldest transaction that this slot needs the database to retain. VACUUM cannot remove tuples deleted by any later transaction", nil, nil}, "catalog_xmin": {DISCARD, "The oldest transaction affecting the system catalogs that this slot needs the database to retain. VACUUM cannot remove catalog tuples deleted by any later transaction", nil, nil}, "restart_lsn": {DISCARD, "The address (LSN) of oldest WAL which still might be required by the consumer of this slot and thus won't be automatically removed during checkpoints", nil, nil}, "pg_current_xlog_location": {DISCARD, "pg_current_xlog_location", nil, nil}, "pg_xlog_location_diff": {GAUGE, "Lag in bytes between master and slave", nil, semver.MustParseRange(">=9.2.0")}, }, "pg_stat_activity": map[string]ColumnMapping{ "datname": {LABEL, "Name of this database", nil, nil}, "state": {LABEL, "connection state", nil, semver.MustParseRange(">=9.2.0")}, "count": {GAUGE, "number of connections in this state", nil, nil}, "max_tx_duration": {GAUGE, "max duration in seconds any active transaction has been running", nil, nil}, }, } // Override querys are run in-place of simple namespace look ups, and provide // advanced functionality. But they have a tendency to postgres version specific. // There aren't too many versions, so we simply store customized versions using // the semver matching we do for columns. type OverrideQuery struct { versionRange semver.Range query string } // Overriding queries for namespaces above. // TODO: validate this is a closed set in tests, and there are no overlaps var queryOverrides = map[string][]OverrideQuery{ "pg_locks": []OverrideQuery{ { semver.MustParseRange(">0.0.0"), `SELECT pg_database.datname,tmp.mode,COALESCE(count,0) as count FROM ( VALUES ('accesssharelock'), ('rowsharelock'), ('rowexclusivelock'), ('shareupdateexclusivelock'), ('sharelock'), ('sharerowexclusivelock'), ('exclusivelock'), ('accessexclusivelock') ) AS tmp(mode) CROSS JOIN pg_database LEFT JOIN (SELECT database, lower(mode) AS mode,count(*) AS count FROM pg_locks WHERE database IS NOT NULL GROUP BY database, lower(mode) ) AS tmp2 ON tmp.mode=tmp2.mode and pg_database.oid = tmp2.database ORDER BY 1`, }, }, "pg_stat_replication": []OverrideQuery{ { semver.MustParseRange(">=9.2.0"), ` SELECT *, pg_current_xlog_location(), pg_xlog_location_diff(pg_current_xlog_location(), replay_location)::float FROM pg_stat_replication `, }, { semver.MustParseRange("<9.2.0"), ` SELECT *, pg_current_xlog_location() FROM pg_stat_replication `, }, }, "pg_stat_activity": []OverrideQuery{ // This query only works { semver.MustParseRange(">=9.2.0"), ` SELECT pg_database.datname, tmp.state, COALESCE(count,0) as count, COALESCE(max_tx_duration,0) as max_tx_duration FROM ( VALUES ('active'), ('idle'), ('idle in transaction'), ('idle in transaction (aborted)'), ('fastpath function call'), ('disabled') ) AS tmp(state) CROSS JOIN pg_database LEFT JOIN ( SELECT datname, state, count(*) AS count, MAX(EXTRACT(EPOCH FROM now() - xact_start))::float AS max_tx_duration FROM pg_stat_activity GROUP BY datname,state) AS tmp2 ON tmp.state = tmp2.state AND pg_database.datname = tmp2.datname `, }, // No query is applicable for 9.1 that gives any sensible data. }, } // Convert the query override file to the version-specific query override file // for the exporter. func makeQueryOverrideMap(pgVersion semver.Version, queryOverrides map[string][]OverrideQuery) map[string]string { resultMap := make(map[string]string) for name, overrideDef := range queryOverrides { // Find a matching semver. We make it an error to have overlapping // ranges at test-time, so only 1 should ever match. matched := false for _, queryDef := range overrideDef { if queryDef.versionRange(pgVersion) { resultMap[name] = queryDef.query matched = true break } } if !matched { log.Warnln("No query matched override for", name, "- disabling metric space.") resultMap[name] = "" } } return resultMap } // Add queries to the metricMaps and queryOverrides maps. Added queries do not // respect version requirements, because it is assumed that the user knows // what they are doing with their version of postgres. // // This function modifies metricMap and queryOverrideMap to contain the new // queries. // TODO: test code for all this. // TODO: use proper struct type system // TODO: the YAML this supports is "non-standard" - we should move away from it. func addQueries(queriesPath string, pgVersion semver.Version, exporterMap map[string]MetricMapNamespace, queryOverrideMap map[string]string) error { var extra map[string]interface{} content, err := ioutil.ReadFile(queriesPath) if err != nil { return err } err = yaml.Unmarshal(content, &extra) if err != nil { return err } // Stores the loaded map representation metricMaps := make(map[string]map[string]ColumnMapping) newQueryOverrides := make(map[string]string) for metric, specs := range extra { log.Debugln("New user metric namespace from YAML:", metric) for key, value := range specs.(map[interface{}]interface{}) { switch key.(string) { case "query": query := value.(string) newQueryOverrides[metric] = query case "metrics": for _, c := range value.([]interface{}) { column := c.(map[interface{}]interface{}) for n, a := range column { var columnMapping ColumnMapping // Fetch the metric map we want to work on. metricMap, ok := metricMaps[metric] if !ok { // Namespace for metric not found - add it. metricMap = make(map[string]ColumnMapping) metricMaps[metric] = metricMap } // Get name. name := n.(string) for attrKey, attrVal := range a.(map[interface{}]interface{}) { switch attrKey.(string) { case "usage": usage, err := stringToColumnUsage(attrVal.(string)) if err != nil { return err } columnMapping.usage = usage case "description": columnMapping.description = attrVal.(string) } } // TODO: we should support this columnMapping.mapping = nil // Should we support this for users? columnMapping.supportedVersions = nil metricMap[name] = columnMapping } } } } } // Convert the loaded metric map into exporter representation partialExporterMap := makeDescMap(pgVersion, metricMaps) // Merge the two maps (which are now quite flatteend) for k, v := range partialExporterMap { _, found := exporterMap[k] if found { log.Debugln("Overriding metric", k, "from user YAML file.") } else { log.Debugln("Adding new metric", k, "from user YAML file.") } exporterMap[k] = v } // Merge the query override map for k, v := range newQueryOverrides { _, found := queryOverrideMap[k] if found { log.Debugln("Overriding query override", k, "from user YAML file.") } else { log.Debugln("Adding new query override", k, "from user YAML file.") } queryOverrideMap[k] = v } return nil } // Turn the MetricMap column mapping into a prometheus descriptor mapping. func makeDescMap(pgVersion semver.Version, metricMaps map[string]map[string]ColumnMapping) map[string]MetricMapNamespace { var metricMap = make(map[string]MetricMapNamespace) for namespace, mappings := range metricMaps { thisMap := make(map[string]MetricMap) // Get the constant labels var constLabels []string for columnName, columnMapping := range mappings { if columnMapping.usage == LABEL { constLabels = append(constLabels, columnName) } } for columnName, columnMapping := range mappings { // Check column version compatibility for the current map // Force to discard if not compatible. if columnMapping.supportedVersions != nil { if !columnMapping.supportedVersions(pgVersion) { // It's very useful to be able to see what columns are being // rejected. log.Debugln(columnName, "is being forced to discard due to version incompatibility.") thisMap[columnName] = MetricMap{ discard: true, conversion: func(in interface{}) (float64, bool) { return math.NaN(), true }, } continue } } // Determine how to convert the column based on its usage. switch columnMapping.usage { case DISCARD, LABEL: thisMap[columnName] = MetricMap{ discard: true, conversion: func(in interface{}) (float64, bool) { return math.NaN(), true }, } case COUNTER: thisMap[columnName] = MetricMap{ vtype: prometheus.CounterValue, desc: prometheus.NewDesc(fmt.Sprintf("%s_%s", namespace, columnName), columnMapping.description, constLabels, nil), conversion: func(in interface{}) (float64, bool) { return dbToFloat64(in) }, } case GAUGE: thisMap[columnName] = MetricMap{ vtype: prometheus.GaugeValue, desc: prometheus.NewDesc(fmt.Sprintf("%s_%s", namespace, columnName), columnMapping.description, constLabels, nil), conversion: func(in interface{}) (float64, bool) { return dbToFloat64(in) }, } case MAPPEDMETRIC: thisMap[columnName] = MetricMap{ vtype: prometheus.GaugeValue, desc: prometheus.NewDesc(fmt.Sprintf("%s_%s", namespace, columnName), columnMapping.description, constLabels, nil), conversion: func(in interface{}) (float64, bool) { text, ok := in.(string) if !ok { return math.NaN(), false } val, ok := columnMapping.mapping[text] if !ok { return math.NaN(), false } return val, true }, } case DURATION: thisMap[columnName] = MetricMap{ vtype: prometheus.GaugeValue, desc: prometheus.NewDesc(fmt.Sprintf("%s_%s_milliseconds", namespace, columnName), columnMapping.description, constLabels, nil), conversion: func(in interface{}) (float64, bool) { var durationString string switch t := in.(type) { case []byte: durationString = string(t) case string: durationString = t default: log.Errorln("DURATION conversion metric was not a string") return math.NaN(), false } if durationString == "-1" { return math.NaN(), false } d, err := time.ParseDuration(durationString) if err != nil { log.Errorln("Failed converting result to metric:", columnName, in, err) return math.NaN(), false } return float64(d / time.Millisecond), true }, } } } metricMap[namespace] = MetricMapNamespace{constLabels, thisMap} } return metricMap } // convert a string to the corresponding ColumnUsage func stringToColumnUsage(s string) (u ColumnUsage, err error) { switch s { case "DISCARD": u = DISCARD case "LABEL": u = LABEL case "COUNTER": u = COUNTER case "GAUGE": u = GAUGE case "MAPPEDMETRIC": u = MAPPEDMETRIC case "DURATION": u = DURATION default: err = fmt.Errorf("wrong ColumnUsage given : %s", s) } return } // Convert database.sql types to float64s for Prometheus consumption. Null types are mapped to NaN. string and []byte // types are mapped as NaN and !ok func dbToFloat64(t interface{}) (float64, bool) { switch v := t.(type) { case int64: return float64(v), true case float64: return v, true case time.Time: return float64(v.Unix()), true case []byte: // Try and convert to string and then parse to a float64 strV := string(v) result, err := strconv.ParseFloat(strV, 64) if err != nil { return math.NaN(), false } return result, true case string: result, err := strconv.ParseFloat(v, 64) if err != nil { log.Infoln("Could not parse string:", err) return math.NaN(), false } return result, true case nil: return math.NaN(), true default: return math.NaN(), false } } // Convert database.sql to string for Prometheus labels. Null types are mapped to empty strings. func dbToString(t interface{}) (string, bool) { switch v := t.(type) { case int64: return fmt.Sprintf("%v", v), true case float64: return fmt.Sprintf("%v", v), true case time.Time: return fmt.Sprintf("%v", v.Unix()), true case nil: return "", true case []byte: // Try and convert to string return string(v), true case string: return v, true default: return "", false } } // Exporter collects Postgres metrics. It implements prometheus.Collector. type Exporter struct { dsn string userQueriesPath string duration, error prometheus.Gauge totalScrapes prometheus.Counter // Last version used to calculate metric map. If mismatch on scrape, // then maps are recalculated. lastMapVersion semver.Version // Currently active variable map variableMap map[string]MetricMapNamespace // Currently active metric map metricMap map[string]MetricMapNamespace // Currently active query overrides queryOverrides map[string]string mappingMtx sync.RWMutex } // NewExporter returns a new PostgreSQL exporter for the provided DSN. func NewExporter(dsn string, userQueriesPath string) *Exporter { return &Exporter{ dsn: dsn, userQueriesPath: userQueriesPath, duration: prometheus.NewGauge(prometheus.GaugeOpts{ Namespace: namespace, Subsystem: exporter, Name: "last_scrape_duration_seconds", Help: "Duration of the last scrape of metrics from PostgresSQL.", }), totalScrapes: prometheus.NewCounter(prometheus.CounterOpts{ Namespace: namespace, Subsystem: exporter, Name: "scrapes_total", Help: "Total number of times PostgresSQL was scraped for metrics.", }), error: prometheus.NewGauge(prometheus.GaugeOpts{ Namespace: namespace, Subsystem: exporter, Name: "last_scrape_error", Help: "Whether the last scrape of metrics from PostgreSQL resulted in an error (1 for error, 0 for success).", }), variableMap: nil, metricMap: nil, queryOverrides: nil, } } // Describe implements prometheus.Collector. func (e *Exporter) Describe(ch chan<- *prometheus.Desc) { // We cannot know in advance what metrics the exporter will generate // from Postgres. So we use the poor man's describe method: Run a collect // and send the descriptors of all the collected metrics. The problem // here is that we need to connect to the Postgres DB. If it is currently // unavailable, the descriptors will be incomplete. Since this is a // stand-alone exporter and not used as a library within other code // implementing additional metrics, the worst that can happen is that we // don't detect inconsistent metrics created by this exporter // itself. Also, a change in the monitored Postgres instance may change the // exported metrics during the runtime of the exporter. metricCh := make(chan prometheus.Metric) doneCh := make(chan struct{}) go func() { for m := range metricCh { ch <- m.Desc() } close(doneCh) }() e.Collect(metricCh) close(metricCh) <-doneCh } // Collect implements prometheus.Collector. func (e *Exporter) Collect(ch chan<- prometheus.Metric) { e.scrape(ch) ch <- e.duration ch <- e.totalScrapes ch <- e.error } func newDesc(subsystem, name, help string) *prometheus.Desc { return prometheus.NewDesc( prometheus.BuildFQName(namespace, subsystem, name), help, nil, nil, ) } // Query the SHOW variables from the query map // TODO: make this more functional func queryShowVariables(ch chan<- prometheus.Metric, db *sql.DB, variableMap map[string]MetricMapNamespace) []error { log.Debugln("Querying SHOW variables") nonFatalErrors := []error{} for _, mapping := range variableMap { for columnName, columnMapping := range mapping.columnMappings { // Check for a discard request on this value if columnMapping.discard { continue } // Use SHOW to get the value row := db.QueryRow(fmt.Sprintf("SHOW %s;", columnName)) var val interface{} err := row.Scan(&val) if err != nil { nonFatalErrors = append(nonFatalErrors, errors.New(fmt.Sprintln("Error scanning runtime variable:", columnName, err))) continue } fval, ok := columnMapping.conversion(val) if !ok { nonFatalErrors = append(nonFatalErrors, errors.New(fmt.Sprintln("Unexpected error parsing column: ", namespace, columnName, val))) continue } ch <- prometheus.MustNewConstMetric(columnMapping.desc, columnMapping.vtype, fval) } } return nonFatalErrors } // Query within a namespace mapping and emit metrics. Returns fatal errors if // the scrape fails, and a slice of errors if they were non-fatal. func queryNamespaceMapping(ch chan<- prometheus.Metric, db *sql.DB, namespace string, mapping MetricMapNamespace, queryOverrides map[string]string) ([]error, error) { // Check for a query override for this namespace query, found := queryOverrides[namespace] if !found { // No query override - do a simple * search. query = fmt.Sprintf("SELECT * FROM %s;", namespace) } // Was this query disabled (i.e. nothing sensible can be queried on this // version of PostgreSQL? if query == "" { // Return success (no pertinent data) return []error{}, nil } // Don't fail on a bad scrape of one metric rows, err := db.Query(query) if err != nil { return []error{}, errors.New(fmt.Sprintln("Error running query on database: ", namespace, err)) } defer rows.Close() var columnNames []string columnNames, err = rows.Columns() if err != nil { return []error{}, errors.New(fmt.Sprintln("Error retrieving column list for: ", namespace, err)) } // Make a lookup map for the column indices var columnIdx = make(map[string]int, len(columnNames)) for i, n := range columnNames { columnIdx[n] = i } var columnData = make([]interface{}, len(columnNames)) var scanArgs = make([]interface{}, len(columnNames)) for i := range columnData { scanArgs[i] = &columnData[i] } nonfatalErrors := []error{} for rows.Next() { err = rows.Scan(scanArgs...) if err != nil { return []error{}, errors.New(fmt.Sprintln("Error retrieving rows:", namespace, err)) } // Get the label values for this row var labels = make([]string, len(mapping.labels)) for idx, columnName := range mapping.labels { labels[idx], _ = dbToString(columnData[columnIdx[columnName]]) } // Loop over column names, and match to scan data. Unknown columns // will be filled with an untyped metric number *if* they can be // converted to float64s. NULLs are allowed and treated as NaN. for idx, columnName := range columnNames { if metricMapping, ok := mapping.columnMappings[columnName]; ok { // Is this a metricy metric? if metricMapping.discard { continue } value, ok := dbToFloat64(columnData[idx]) if !ok { nonfatalErrors = append(nonfatalErrors, errors.New(fmt.Sprintln("Unexpected error parsing column: ", namespace, columnName, columnData[idx]))) continue } // Generate the metric ch <- prometheus.MustNewConstMetric(metricMapping.desc, metricMapping.vtype, value, labels...) } else { // Unknown metric. Report as untyped if scan to float64 works, else note an error too. desc := prometheus.NewDesc(fmt.Sprintf("%s_%s", namespace, columnName), fmt.Sprintf("Unknown metric from %s", namespace), nil, nil) // Its not an error to fail here, since the values are // unexpected anyway. value, ok := dbToFloat64(columnData[idx]) if !ok { nonfatalErrors = append(nonfatalErrors, errors.New(fmt.Sprintln("Unparseable column type - discarding: ", namespace, columnName, err))) continue } log.Debugln(columnName, labels) ch <- prometheus.MustNewConstMetric(desc, prometheus.UntypedValue, value, labels...) } } } return nonfatalErrors, nil } // Iterate through all the namespace mappings in the exporter and run their // queries. func queryNamespaceMappings(ch chan<- prometheus.Metric, db *sql.DB, metricMap map[string]MetricMapNamespace, queryOverrides map[string]string) map[string]error { // Return a map of namespace -> errors namespaceErrors := make(map[string]error) for namespace, mapping := range metricMap { log.Debugln("Querying namespace: ", namespace) nonFatalErrors, err := queryNamespaceMapping(ch, db, namespace, mapping, queryOverrides) // Serious error - a namespace disappeard if err != nil { namespaceErrors[namespace] = err log.Infoln(err) } // Non-serious errors - likely version or parsing problems. if len(nonFatalErrors) > 0 { for _, err := range nonFatalErrors { log.Infoln(err.Error()) } } } return namespaceErrors } // Check and update the exporters query maps if the version has changed. func (e *Exporter) checkMapVersions(ch chan<- prometheus.Metric, db *sql.DB) error { log.Debugln("Querying Postgres Version") versionRow := db.QueryRow("SELECT version();") var versionString string err := versionRow.Scan(&versionString) if err != nil { return errors.New(fmt.Sprintln("Error scanning version string:", err)) } semanticVersion, err := parseVersion(versionString) // Check if semantic version changed and recalculate maps if needed. if semanticVersion.NE(e.lastMapVersion) || e.variableMap == nil || e.metricMap == nil { log.Infoln("Semantic Version Changed:", e.lastMapVersion.String(), "->", semanticVersion.String()) e.mappingMtx.Lock() e.variableMap = makeDescMap(semanticVersion, variableMaps) e.metricMap = makeDescMap(semanticVersion, metricMaps) e.queryOverrides = makeQueryOverrideMap(semanticVersion, queryOverrides) e.lastMapVersion = semanticVersion if e.userQueriesPath != "" { if err := addQueries(e.userQueriesPath, semanticVersion, e.metricMap, e.queryOverrides); err != nil { log.Errorln("Failed to reload user queries:", e.userQueriesPath, err) } } e.mappingMtx.Unlock() } // Output the version as a special metric versionDesc := prometheus.NewDesc(fmt.Sprintf("%s_%s", namespace, staticLabelName), "Version string as reported by postgres", []string{"version", "short_version"}, nil) ch <- prometheus.MustNewConstMetric(versionDesc, prometheus.UntypedValue, 1, versionString, semanticVersion.String()) return nil } func (e *Exporter) scrape(ch chan<- prometheus.Metric) { defer func(begun time.Time) { e.duration.Set(time.Since(begun).Seconds()) }(time.Now()) e.error.Set(0) e.totalScrapes.Inc() db, err := sql.Open("postgres", e.dsn) if err != nil { log.Infoln("Error opening connection to database:", err) e.error.Set(1) return } defer db.Close() // Check if map versions need to be updated if err := e.checkMapVersions(ch, db); err != nil { log.Warnln("Postgres version could not be determined. Proceeding with outdated query maps.") e.error.Set(1) } // Lock the exporter maps e.mappingMtx.RLock() defer e.mappingMtx.RUnlock() // Handle querying the show variables nonFatalErrors := queryShowVariables(ch, db, e.variableMap) if len(nonFatalErrors) > 0 { e.error.Set(1) } errMap := queryNamespaceMappings(ch, db, e.metricMap, e.queryOverrides) if len(errMap) > 0 { e.error.Set(1) } } func main() { flag.Parse() if *onlyDumpMaps { dumpMaps() return } dsn := os.Getenv("DATA_SOURCE_NAME") if len(dsn) == 0 { log.Fatal("couldn't find environment variable DATA_SOURCE_NAME") } exporter := NewExporter(dsn, *queriesPath) prometheus.MustRegister(exporter) http.Handle(*metricPath, prometheus.Handler()) http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) { w.Write(landingPage) }) log.Infof("Starting Server: %s", *listenAddress) log.Fatal(http.ListenAndServe(*listenAddress, nil)) } prometheus-postgres-exporter-0.1.1+ds/postgres_exporter_integration_test.go000066400000000000000000000034561304475311500276220ustar00rootroot00000000000000// These are specialized integration tests. We only build them when we're doing // a lot of additional work to keep the external docker environment they require // working. // +build integration package main import ( "os" "testing" . "gopkg.in/check.v1" "github.com/prometheus/client_golang/prometheus" "database/sql" _ "github.com/lib/pq" "fmt" ) // Hook up gocheck into the "go test" runner. func Test(t *testing.T) { TestingT(t) } type IntegrationSuite struct{ e *Exporter } var _ = Suite(&IntegrationSuite{}) func (s *IntegrationSuite) SetUpSuite(c *C) { dsn := os.Getenv("DATA_SOURCE_NAME") c.Assert(dsn, Not(Equals), "") exporter := NewExporter(dsn, "") c.Assert(exporter, NotNil) // Assign the exporter to the suite s.e = exporter prometheus.MustRegister(exporter) } // TODO: it would be nice if this didn't mostly just recreate the scrape function func (s *IntegrationSuite) TestAllNamespacesReturnResults(c *C) { // Setup a dummy channel to consume metrics ch := make(chan prometheus.Metric, 100) go func() { for _ = range ch {} }() // Open a database connection db, err := sql.Open("postgres", s.e.dsn) c.Assert(db, NotNil) c.Assert(err, IsNil) defer db.Close() // Do a version update err = s.e.checkMapVersions(ch, db) c.Assert(err, IsNil) // Check the show variables work nonFatalErrors := queryShowVariables(ch, db, s.e.variableMap) if !c.Check(len(nonFatalErrors), Equals, 0) { fmt.Println("## NONFATAL ERRORS FOUND") for _, err := range nonFatalErrors { fmt.Println(err) } } // This should never happen in our test cases. errMap := queryNamespaceMappings(ch, db, s.e.metricMap, s.e.queryOverrides) if !c.Check(len(errMap), Equals, 0) { fmt.Println("## NAMESPACE ERRORS FOUND") for namespace, err := range errMap { fmt.Println(namespace, ":", err) } } }prometheus-postgres-exporter-0.1.1+ds/postgres_exporter_test.go000066400000000000000000000044251304475311500252140ustar00rootroot00000000000000// +build !integration package main import ( "testing" . "gopkg.in/check.v1" "github.com/blang/semver" ) // Hook up gocheck into the "go test" runner. func Test(t *testing.T) { TestingT(t) } type FunctionalSuite struct{ e *Exporter } var _ = Suite(&FunctionalSuite{}) func (s *FunctionalSuite) SetUpSuite(c *C) { } func (s *FunctionalSuite) TestSemanticVersionColumnDiscard(c *C) { testMetricMap := map[string]map[string]ColumnMapping{ "test_namespace" : map[string]ColumnMapping{ "metric_which_stays" : {COUNTER, "This metric should not be eliminated", nil, nil}, "metric_which_discards" : {COUNTER, "This metric should be forced to DISCARD", nil, nil}, }, } { // No metrics should be eliminated resultMap := makeDescMap(semver.MustParse("0.0.1"), testMetricMap) c.Check( resultMap["test_namespace"].columnMappings["metric_which_stays"].discard, Equals, false, ) c.Check( resultMap["test_namespace"].columnMappings["metric_which_discards"].discard, Equals, false, ) } { // Update the map so the discard metric should be eliminated discardable_metric := testMetricMap["test_namespace"]["metric_which_discards"] discardable_metric.supportedVersions = semver.MustParseRange(">0.0.1") testMetricMap["test_namespace"]["metric_which_discards"] = discardable_metric // Discard metric should be discarded resultMap := makeDescMap(semver.MustParse("0.0.1"), testMetricMap) c.Check( resultMap["test_namespace"].columnMappings["metric_which_stays"].discard, Equals, false, ) c.Check( resultMap["test_namespace"].columnMappings["metric_which_discards"].discard, Equals, true, ) } { // Update the map so the discard metric should be kept but has a version discardable_metric := testMetricMap["test_namespace"]["metric_which_discards"] discardable_metric.supportedVersions = semver.MustParseRange(">0.0.1") testMetricMap["test_namespace"]["metric_which_discards"] = discardable_metric // Discard metric should be discarded resultMap := makeDescMap(semver.MustParse("0.0.2"), testMetricMap) c.Check( resultMap["test_namespace"].columnMappings["metric_which_stays"].discard, Equals, false, ) c.Check( resultMap["test_namespace"].columnMappings["metric_which_discards"].discard, Equals, false, ) } }prometheus-postgres-exporter-0.1.1+ds/queries.yaml000066400000000000000000000100431304475311500223620ustar00rootroot00000000000000pg_replication: query: "SELECT EXTRACT(EPOCH FROM (now() - pg_last_xact_replay_timestamp()))::INT as lag" metrics: - lag: usage: "GAUGE" description: "Replication lag behind master in seconds" pg_postmaster: query: "SELECT pg_postmaster_start_time as start_time_seconds from pg_postmaster_start_time()" metrics: - start_time_seconds: usage: "GAUGE" description: "Time at which postmaster started" pg_settings_shared_buffers: query: "SELECT 8192*setting::int as bytes from pg_settings where name = 'shared_buffers'" metrics: - bytes: usage: "GAUGE" description: "Size of shared_buffers" pg_settings_checkpoint: query: "select (select setting::int from pg_settings where name = 'checkpoint_segments') as segments, (select setting::int from pg_settings where name = 'checkpoint_timeout') as timeout_seconds, (select setting::float from pg_settings where name = 'checkpoint_completion_target') as completion_target" metrics: - segments: usage: "GAUGE" description: "Number of checkpoint segments" - timeout_seconds: usage: "GAUGE" description: "Checkpoint timeout in seconds" - completion_target: usage: "GAUGE" description: "Checkpoint completion target, ranging from 0 to 1" pg_stat_user_tables: query: "SELECT schemaname, relname, seq_scan, seq_tup_read, idx_scan, idx_tup_fetch, n_tup_ins, n_tup_upd, n_tup_del, n_tup_hot_upd, n_live_tup, n_dead_tup, n_mod_since_analyze, last_vacuum, last_autovacuum, last_analyze, last_autoanalyze, vacuum_count, autovacuum_count, analyze_count, autoanalyze_count FROM pg_stat_user_tables" metrics: - schemaname: usage: "LABEL" description: "Name of the schema that this table is in" - relname: usage: "LABEL" description: "Name of this table" - seq_scan: usage: "COUNTER" description: "Number of sequential scans initiated on this table" - seq_tup_read: usage: "COUNTER" description: "Number of live rows fetched by sequential scans" - idx_scan: usage: "COUNTER" description: "Number of index scans initiated on this table" - idx_tup_fetch: usage: "COUNTER" description: "Number of live rows fetched by index scans" - n_tup_ins: usage: "COUNTER" description: "Number of rows inserted" - n_tup_upd: usage: "COUNTER" description: "Number of rows updated" - n_tup_del: usage: "COUNTER" description: "Number of rows deleted" - n_tup_hot_upd: usage: "COUNTER" description: "Number of rows HOT updated (i.e., with no separate index update required)" - n_live_tup: usage: "GAUGE" description: "Estimated number of live rows" - n_dead_tup: usage: "GAUGE" description: "Estimated number of dead rows" - n_mod_since_analyze: usage: "GAUGE" description: "Estimated number of rows changed since last analyze" - last_vacuum: usage: "GAUGE" description: "Last time at which this table was manually vacuumed (not counting VACUUM FULL)" - last_autovacuum: usage: "GAUGE" description: "Last time at which this table was vacuumed by the autovacuum daemon" - last_analyze: usage: "GAUGE" description: "Last time at which this table was manually analyzed" - last_autoanalyze: usage: "GAUGE" description: "Last time at which this table was analyzed by the autovacuum daemon" - vacuum_count: usage: "COUNTER" description: "Number of times this table has been manually vacuumed (not counting VACUUM FULL)" - autovacuum_count: usage: "COUNTER" description: "Number of times this table has been vacuumed by the autovacuum daemon" - analyze_count: usage: "COUNTER" description: "Number of times this table has been manually analyzed" - autoanalyze_count: usage: "COUNTER" description: "Number of times this table has been analyzed by the autovacuum daemon" prometheus-postgres-exporter-0.1.1+ds/tests/000077500000000000000000000000001304475311500211655ustar00rootroot00000000000000prometheus-postgres-exporter-0.1.1+ds/tests/docker-postgres-replication/000077500000000000000000000000001304475311500266075ustar00rootroot00000000000000prometheus-postgres-exporter-0.1.1+ds/tests/docker-postgres-replication/Dockerfile000077500000000000000000000004651304475311500306110ustar00rootroot00000000000000FROM postgres:9.6 MAINTAINER Daniel Dent (https://www.danieldent.com) ENV PG_MAX_WAL_SENDERS 8 ENV PG_WAL_KEEP_SEGMENTS 8 COPY setup-replication.sh /docker-entrypoint-initdb.d/ COPY docker-entrypoint.sh /docker-entrypoint.sh RUN chmod +x /docker-entrypoint-initdb.d/setup-replication.sh /docker-entrypoint.sh prometheus-postgres-exporter-0.1.1+ds/tests/docker-postgres-replication/Dockerfile.p2000066400000000000000000000004751304475311500311270ustar00rootroot00000000000000FROM postgres:{{VERSION}} MAINTAINER Daniel Dent (https://www.danieldent.com) ENV PG_MAX_WAL_SENDERS 8 ENV PG_WAL_KEEP_SEGMENTS 8 COPY setup-replication.sh /docker-entrypoint-initdb.d/ COPY docker-entrypoint.sh /docker-entrypoint.sh RUN chmod +x /docker-entrypoint-initdb.d/setup-replication.sh /docker-entrypoint.sh prometheus-postgres-exporter-0.1.1+ds/tests/docker-postgres-replication/README.md000066400000000000000000000006131304475311500300660ustar00rootroot00000000000000# Replicated postgres cluster in docker. Upstream is forked from https://github.com/DanielDent/docker-postgres-replication My version lives at https://github.com/wrouesnel/docker-postgres-replication This very simple docker-compose file lets us stand up a replicated postgres cluster so we can test streaming. # TODO: Pull in p2 and template the Dockerfile so we can test multiple versions. prometheus-postgres-exporter-0.1.1+ds/tests/docker-postgres-replication/docker-compose.yml000066400000000000000000000012631304475311500322460ustar00rootroot00000000000000 version: '2' services: pg-master: build: '.' image: 'danieldent/postgres-replication' restart: 'always' environment: POSTGRES_USER: 'postgres' POSTGRES_PASSWORD: 'postgres' PGDATA: '/var/lib/postgresql/data/pgdata' volumes: - '/var/lib/postgresql/data' expose: - '5432' pg-slave: build: '.' image: 'danieldent/postgres-replication' restart: 'always' environment: POSTGRES_USER: 'postgres' POSTGRES_PASSWORD: 'postgres' PGDATA: '/var/lib/postgresql/data/pgdata' REPLICATE_FROM: 'pg-master' volumes: - '/var/lib/postgresql/data' expose: - '5432' links: - 'pg-master' prometheus-postgres-exporter-0.1.1+ds/tests/docker-postgres-replication/docker-entrypoint.sh000077500000000000000000000076031304475311500326340ustar00rootroot00000000000000#!/bin/bash # Backwards compatibility for old variable names (deprecated) if [ "x$PGUSER" != "x" ]; then POSTGRES_USER=$PGUSER fi if [ "x$PGPASSWORD" != "x" ]; then POSTGRES_PASSWORD=$PGPASSWORD fi # Forwards-compatibility for old variable names (pg_basebackup uses them) if [ "x$PGPASSWORD" = "x" ]; then export PGPASSWORD=$POSTGRES_PASSWORD fi # Based on official postgres package's entrypoint script (https://hub.docker.com/_/postgres/) # Modified to be able to set up a slave. The docker-entrypoint-initdb.d hook provided is inadequate. set -e if [ "${1:0:1}" = '-' ]; then set -- postgres "$@" fi if [ "$1" = 'postgres' ]; then mkdir -p "$PGDATA" chmod 700 "$PGDATA" chown -R postgres "$PGDATA" mkdir -p /run/postgresql chmod g+s /run/postgresql chown -R postgres /run/postgresql # look specifically for PG_VERSION, as it is expected in the DB dir if [ ! -s "$PGDATA/PG_VERSION" ]; then if [ "x$REPLICATE_FROM" == "x" ]; then eval "gosu postgres initdb $POSTGRES_INITDB_ARGS" else until ping -c 1 -W 1 ${REPLICATE_FROM} do echo "Waiting for master to ping..." sleep 1s done until gosu postgres pg_basebackup -h ${REPLICATE_FROM} -D ${PGDATA} -U ${POSTGRES_USER} -vP -w do echo "Waiting for master to connect..." sleep 1s done fi # check password first so we can output the warning before postgres # messes it up if [ ! -z "$POSTGRES_PASSWORD" ]; then pass="PASSWORD '$POSTGRES_PASSWORD'" authMethod=md5 else # The - option suppresses leading tabs but *not* spaces. :) cat >&2 <<-'EOWARN' **************************************************** WARNING: No password has been set for the database. This will allow anyone with access to the Postgres port to access your database. In Docker's default configuration, this is effectively any other container on the same system. Use "-e POSTGRES_PASSWORD=password" to set it in "docker run". **************************************************** EOWARN pass= authMethod=trust fi if [ "x$REPLICATE_FROM" == "x" ]; then { echo; echo "host replication all 0.0.0.0/0 $authMethod"; } | gosu postgres tee -a "$PGDATA/pg_hba.conf" > /dev/null { echo; echo "host all all 0.0.0.0/0 $authMethod"; } | gosu postgres tee -a "$PGDATA/pg_hba.conf" > /dev/null # internal start of server in order to allow set-up using psql-client # does not listen on external TCP/IP and waits until start finishes gosu postgres pg_ctl -D "$PGDATA" \ -o "-c listen_addresses='localhost'" \ -w start : ${POSTGRES_USER:=postgres} : ${POSTGRES_DB:=$POSTGRES_USER} export POSTGRES_USER POSTGRES_DB psql=( psql -v ON_ERROR_STOP=1 ) if [ "$POSTGRES_DB" != 'postgres' ]; then "${psql[@]}" --username postgres <<-EOSQL CREATE DATABASE "$POSTGRES_DB" ; EOSQL echo fi if [ "$POSTGRES_USER" = 'postgres' ]; then op='ALTER' else op='CREATE' fi "${psql[@]}" --username postgres <<-EOSQL $op USER "$POSTGRES_USER" WITH SUPERUSER $pass ; EOSQL echo fi psql+=( --username "$POSTGRES_USER" --dbname "$POSTGRES_DB" ) echo for f in /docker-entrypoint-initdb.d/*; do case "$f" in *.sh) echo "$0: running $f"; . "$f" ;; *.sql) echo "$0: running $f"; "${psql[@]}" < "$f"; echo ;; *.sql.gz) echo "$0: running $f"; gunzip -c "$f" | "${psql[@]}"; echo ;; *) echo "$0: ignoring $f" ;; esac echo done if [ "x$REPLICATE_FROM" == "x" ]; then gosu postgres pg_ctl -D "$PGDATA" -m fast -w stop fi echo echo 'PostgreSQL init process complete; ready for start up.' echo fi # We need this health check so we know when it's started up. touch /tmp/.postgres_init_complete exec gosu postgres "$@" fi exec "$@" prometheus-postgres-exporter-0.1.1+ds/tests/docker-postgres-replication/setup-replication.sh000077500000000000000000000010101304475311500326050ustar00rootroot00000000000000#!/bin/bash if [ "x$REPLICATE_FROM" == "x" ]; then cat >> ${PGDATA}/postgresql.conf < ${PGDATA}/recovery.conf <&2 exit 1 fi if [ -z $port ]; then echo "No port specified." 1>&2 exit 1 fi local wait_start=$(date +%s) echo "Waiting for postgres to start listening..." while ! pg_isready --host=$ip --port=$port &> /dev/null; do if [ $(( $(date +%s) - $wait_start )) -gt $TIMEOUT ]; then echo "Timed out waiting for postgres to start!" 1>&2 exit 1 fi sleep 1 done } wait_for_exporter() { local wait_start=$(date +%s) echo "Waiting for exporter to start..." while ! nc -z localhost $exporter_port ; do if [ $(( $(date +%s) - $wait_start )) -gt $TIMEOUT ]; then echo "Timed out waiting for exporter!" 1>&2 exit 1 fi sleep 1 done } smoketest_postgres() { local version=$1 local CONTAINER_NAME=postgres_exporter-test-smoke local TIMEOUT=30 local IMAGE_NAME=postgres local CUR_IMAGE=$IMAGE_NAME:$version echo "#######################" echo "Standalone Postgres $version" echo "#######################" local docker_cmd="docker run -d -e POSTGRES_PASSWORD=$POSTGRES_PASSWORD -p 127.0.0.1:55432:5432 $CUR_IMAGE" echo "Docker Cmd: $docker_cmd" CONTAINER_NAME=$($docker_cmd) trap "docker logs $CONTAINER_NAME ; docker kill $CONTAINER_NAME ; docker rm -v $CONTAINER_NAME; exit 1" EXIT INT TERM wait_for_postgres localhost 55432 DATA_SOURCE_NAME="postgresql://postgres:$POSTGRES_PASSWORD@localhost:55432/?sslmode=disable" $test_binary --log.level=debug || exit $? # exporter_pid=$! # trap "docker logs $CONTAINER_NAME ; docker kill $CONTAINER_NAME ; docker rm $CONTAINER_NAME ; kill $exporter_pid; exit 1" EXIT INT TERM # wait_for_exporter # # wget -q -O - http://localhost:$exporter_port/metrics 1> /dev/null # if [ "$?" != "0" ]; then # echo "Failed on postgres $version ($DOCKER_IMAGE)" 1>&2 # kill $exporter_pid # exit 1 # fi # # kill $exporter_pid docker kill $CONTAINER_NAME docker rm -v $CONTAINER_NAME trap - EXIT INT TERM echo "#######################" echo "Replicated Postgres $version" echo "#######################" old_pwd=$(pwd) cd docker-postgres-replication VERSION=$version p2 -t Dockerfile.p2 -o Dockerfile if [ "$?" != "0" ]; then echo "Templating failed" 1>&2 exit 1 fi trap "docker-compose logs; docker-compose down ; docker-compose rm -v; exit 1" EXIT INT TERM local compose_cmd="POSTGRES_PASSWORD=$POSTGRES_PASSWORD docker-compose up -d --force-recreate --build" echo "Compose Cmd: $compose_cmd" eval $compose_cmd master_container=$(docker-compose ps -q pg-master) slave_container=$(docker-compose ps -q pg-slave) master_ip=$(docker inspect -f '{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' $master_container) slave_ip=$(docker inspect -f '{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' $slave_container) echo "Got master IP: $master_ip" wait_for_postgres $master_ip 5432 wait_for_postgres $slave_ip 5432 DATA_SOURCE_NAME="postgresql://postgres:$POSTGRES_PASSWORD@$master_ip:5432/?sslmode=disable" $test_binary --log.level=debug || exit $? 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