Varnish exporter for Prometheus
varnishstat -j JSON output on each Prometheus collect and exposes all reported metrics. Metrics with multiple backends or varnish defined identifiers (e.g.
VBE.*.happy SMA.*.c_bytes LCK.*.creat) and other metrics with similar structure (e.g.
MAIN.fetch_*) are combined under a single metric name with distinguishable labels. Vanish naming conventions are preserved as much as possible to be familiar to Varnish users when building queries, while at the same time trying to following Prometheus conventions like lower casing and using
Handles runtime Varnish changes like adding new backends via vlc reload. Removed backends are reported by
varnishstat until Varnish is restarted.
Advanced users can use
-n -N, they are passed to
I have personally tested the following versions of Varnish to work
6.0.0, 5.2.1, 5.1.2, 4.1.1, 4.1.0, 4.0.3 and 3.0.5. Missing category groupings in 3.x like
MAIN. are detected and added automatically for label names to be consistent across versions, assuming of course that the Varnish project does not remove/change the stats.
I won't make any backwards compatibility promises at this point. Your built queries can break on new versions if metric names or labels are refined. If you find bugs or have feature requests feel free to create issues or send PRs.
Installing and running
You can find the latest binary releases for linux, darwin, windows, freebsd, openbsd and netbsd from the github releases page.
By default the exporter listens on port 9131. See
prometheus_varnish_exporter -h for available options.
To test that
varnishstat is found on the host machine and to preview all exported metrics run
Could not get hold of varnishd, is it running?
2020/12/18 20:22:33 [FATAL] Startup test: varnishstat scrape failed: exit status 1
User you are executing as can't find or access varnish services.
sudo is a hammer that works, see for proper solutions #62.
Scraping metrics from Varnish running in a docker container is possible since 1.4.1. Resolve your Varnish container name with
docker ps and run the following. This will use
docker exec <container-name> to execute varnishstat inside the spesified container.
prometheus_varnish_exporter -docker-container-name <container_name>
I still don't have a easy, clear and user friendly way of running this exporter in a docker container. For community efforts and solutions see this issue.
You can download my dashboard seen in the above picture here. I use it at work with our production Varnish instances. I would be interested in your dashboards if you wish to share them or improvement ideas to my current one.
Varnish 4 and VCL UUIDs
Starting with version 1.2
server labels are always set. For backend-related metrics and Varnish 4 the
server tag will be set to the VCL UUIDs for that backend. Note that there might be multiple VCLs loaded at the same time and the
server tag might not be meaningful in that case.
To aggregate all loaded VCLs into per-backend metric the following Prometheus recording rules are recommended:
backend:varnish_backend_bereq_bodybytes:sum = sum(varnish_backend_bereq_bodybytes) without (server) backend:varnish_backend_bereq_hdrbytes:sum = sum(varnish_backend_bereq_hdrbytes) without (server) backend:varnish_backend_beresp_bodybytes:sum = sum(varnish_backend_beresp_bodybytes) without (server) backend:varnish_backend_beresp_hdrbytes:sum = sum(varnish_backend_beresp_hdrbytes) without (server) backend:varnish_backend_conn:sum = sum(varnish_backend_conn) without (server) backend:varnish_backend_happy:sum = sum(varnish_backend_happy) without (server) backend:varnish_backend_pipe_hdrbytes:sum = sum(varnish_backend_pipe) without (server) backend:varnish_backend_pipe_in:sum = sum(varnish_backend_pipe_in) without (server) backend:varnish_backend_pipe_out:sum = sum(varnish_backend_pipe_out) without (server) backend:varnish_backend_req:sum = sum(varnish_backend_req) without (server)
One time setup
This repot support go modules so out of
GOPATH builds are supported. This makes development and buildings easier for go "novices".
You need go 1.11 or higher, otherwise you can keep using
GOPATH based development (see old README).
- Install latest go or use OS repos
# clone git clone email@example.com:jonnenauha/prometheus_varnish_exporter.git cd prometheus_varnish_exporter # build binary to current directory go build # release with cross compilation ./build.sh <version>