This walkthrough covers the basic setup and configuration for monitoring a NATS server using the NATS Prometheus exporter, Prometheus, and Grafana.
For this walkthrough, you'll need to install the NATS Prometheus Exporter, NATS Server, Prometheus, and Grafana
go get github.com/nats-io/nats-server
You'll need Prometheus installed; refer to the Prometheus download and installation instructions.
For this walkthough you'll also need to download and install Grafana.
Ensure you are working in the walkthrough directory:
cd walkthrough
It is helpful to start four console windows, one for each component.
Be sure to include the a monitoring port:
nats-server -m 8222
Next, launch the NATS prometheus exporter. Here we configure the same monitor port we specified when launching the NATS server. If a NATS server is not running, the exporter will retry to connect to the NATS server indefinitely.
prometheus-nats-exporter -varz -jsz=all http://localhost:8222
You should see something like this:
[21690] 2017/05/02 10:10:37.461404 [INF] Prometheus exporter listening at 0.0.0.0:7777
prometheus
Prometheus will use the configuration file located in this directory.
You'll see something like this:
INFO[0000] Starting prometheus (version=1.3.1, branch=, revision=) source=main.go:75
INFO[0000] Build context (go=go1.7.3, user=brew@yosemitevm.local, date=20161105-11:15:15) source=main.go:76
INFO[0000] Loading configuration file prometheus.yml source=main.go:247
INFO[0000] Loading series map and head chunks... source=storage.go:354
INFO[0000] 0 series loaded. source=storage.go:359
INFO[0000] Listening on :9090 source=web.go:240
WARN[0000] No AlertManagers configured, not dispatching any alerts source=notifier.go:176
INFO[0000] Starting target manager... source=targetmanager.go:76
For this walkthrough we use the default URL, http://localhost:9090
.
Start your Grafana server. Your settings may differ. Try starting with the server config included in the Grafana tarball.
grafana-server --config=/usr/local/etc/grafana/grafana.ini --homepath /usr/local/share/grafana cfg:default.paths.logs=/usr/local/var/log/grafana cfg:default.paths.data=/usr/local/var/lib/grafana cfg:default.paths.plugins=/usr/local/var/lib/grafana/plugins
Note, your configuration and startup may vary
Look for a log line like this to find the Grafana URL:
INFO[05-02|10:36:04] Server Listening logger=server address=0.0.0.0:3000 protocol=http subUrl=
Connect to Grafana, using the correct host and port. The default Grafana user is admin
and the default password is admin
.
Add a Prometheus data source with the following parameters:
- Name: NATS-Prometheus
- Type: Prometheus
- Url:
http://localhost:9090
(default, unless changed above)
Leave the rest as defaults.
Next import the NATS dashboard, grafana-nats-dash.json
into Grafana, and associate the
Prometheus datasource you just created. You should start seeing data graph as follows (note that
selecting a view of the last five minutes will be more exciting).
Experiment running benchmarks and applications and you'll see a dashboard like the one below!
If you're using JetStream, you can import the JetStream dashboard (grafana-jetstream-dash.json
) too:
⚠️ Note for Helm Deployments: When deploying the Prometheus NATS exporter via the standard Helm charts, the metrics prefix is overridden fromgnatsd
&jetstream
tonats
. You can either simply do a find & replace for these prefixes and replace them in the dashboard, or use thegrafana-jetstream-dash-helm.json
file (where this has been done already).