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Will Rouesnel 054d825c7d Vendor all dependencies, add docker build to makefile.

Vendor and store all dependencies. This allows us to have a makefile which
builds to a minimized docker image.

2016-03-12 21:16:17 +11:00

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PostgresSQL Server Exporter

Prometheus exporter for PostgresSQL server metrics. Supported Postgres versions: 9.1 and up.

Quick Start

This package is available for Docker:

docker run -e DATA_SOURCE_NAME="login:password@(hostname:port)/dbname" -p 9113:9113 wrouesnel/postgres_exporter

Building and running

The default make file behavior is to build the binary:

make
export DATA_SOURCE_NAME="login:password@(hostname:port)/dbname"
./postgres_exporter <flags>

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

Flags

Name	Description
web.listen-address	Address to listen on for web interface and telemetry.
web.telemetry-path	Path under which to expose metrics.

Setting the Postgres server's data source name

The PostgresSQL server's data source name must be set via the DATA_SOURCE_NAME environment variable. The format of this variable is described at https://github.com/go-sql-driver/mysql#dsn-data-source-name.

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:

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.

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