openvpn_exporter

This repository provides code for a simple Prometheus metrics exporter for OpenVPN. Right now it can parse files generated by OpenVPN's --status, having one of the following formats:

Client statistics,
Server statistics with --status-version 2 (comma delimited),
Server statistics with --status-version 3 (tab delimited).

As it is not uncommon to run multiple instances of OpenVPN on a single system (e.g., multiple servers, multiple clients or a mixture of both), this exporter can be configured to scrape and export the status of multiple status files, using the -openvpn.status_paths command line flag. Paths need to be comma separated. Metrics for all status files are exported over TCP port 9176.

Please refer to this utility's main() function for a full list of supported command line flags.

Exposed metrics example

Client statistics

For clients status files, the exporter generates metrics that may look like this:

openvpn_client_auth_read_bytes_total{status_path="..."} 3.08854782e+08
openvpn_client_post_compress_bytes_total{status_path="..."} 4.5446864e+07
openvpn_client_post_decompress_bytes_total{status_path="..."} 2.16965355e+08
openvpn_client_pre_compress_bytes_total{status_path="..."} 4.538819e+07
openvpn_client_pre_decompress_bytes_total{status_path="..."} 1.62596168e+08
openvpn_client_tcp_udp_read_bytes_total{status_path="..."} 2.92806201e+08
openvpn_client_tcp_udp_write_bytes_total{status_path="..."} 1.97558969e+08
openvpn_client_tun_tap_read_bytes_total{status_path="..."} 1.53789941e+08
openvpn_client_tun_tap_write_bytes_total{status_path="..."} 3.08764078e+08
openvpn_status_update_time_seconds{status_path="..."} 1.490092749e+09
openvpn_up{status_path="..."} 1

Server statistics

For server status files (both version 2 and 3), the exporter generates metrics that may look like this:

openvpn_server_client_received_bytes_total{common_name="...",connection_time="...",real_address="...",status_path="...",username="...",virtual_address="..."} 139583
openvpn_server_client_sent_bytes_total{common_name="...",connection_time="...",real_address="...",status_path="...",username="...",virtual_address="..."} 710764
openvpn_server_route_last_reference_time_seconds{common_name="...",real_address="...",status_path="...",virtual_address="..."} 1.493018841e+09
openvpn_status_update_time_seconds{status_path="..."} 1.490089154e+09
openvpn_up{status_path="..."} 1
openvpn_server_connected_clients 1

Usage

  -ignore.individuals
        If ignoring metrics for individuals
  -openvpn.status_paths string
        Paths at which OpenVPN places its status files. (default "examples/client.status,examples/server2.status,examples/server3.status")
  -version
        Show version information and exit
  -web.listen-address string
        Address to listen on for web interface and telemetry. (default ":9176")
  -web.telemetry-path string
        Path under which to expose metrics. (default "/metrics")

E.g:

openvpn_exporter -openvpn.status_paths /etc/openvpn/server.status

Docker

To use with docker, the openvpn server status file must be mounted in the container.

docker run --rm \
  -p 9176:9176 \
  -v /etc/openvpn/server.status:/server.status:ro \
  theohbrothers/openvpn_exporter:latest -openvpn.status_paths /server.status

Metrics should be available at http://localhost:9176/metrics.

Get a standalone executable binary

You can download the pre-compiled binaries from the releases page.

Development

Requires make, docker, and docker-compose if you want all make commands to be working.

Requires go only if you are developing.

# Print usage
make help

# Build
make build # Defaults to linux amd64
make build GOOS=linux GOARCH=arm64 # For arm64

# Build docker image
make build-image # Defaults to linux amd64
make build-image GOOS=linux GOARCH=arm64 # For arm64

# Build multiarch docker images
make buildx-image # Build
make buildx-image REGISTRY=xxx REGISTRY_USER=xxx BUILDX_PUSH=true BUILDX_TAG_LATEST=true # Build and push

# Start a shell in a container
make shell

# Test
make test

# Cleanup
make clean