Estimated reading time: 8 minutes ![For For](/uploads/1/2/4/8/124852299/293452052.png)
![Prometheus app Prometheus app](/uploads/1/2/4/8/124852299/181799824.jpg)
Prometheus is an open-source systems monitoring andalerting toolkit. You can configure Docker as a Prometheus target. This topicshows you how to configure Docker, set up Prometheus to run as a Dockercontainer, and monitor your Docker instance using Prometheus.
Warning: The available metrics and the names of those metrics are inactive development and may change at any time.
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Currently, you can only monitor Docker itself. You cannot currently monitor yourapplication using the Docker target.
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Configure Docker
To configure the Docker daemon as a Prometheus target, you need to specify the
metrics-address
. The best way to do this is via the daemon.json
, which islocated at one of the following locations by default. If the file does notexist, create it.- Linux:
/etc/docker/daemon.json
- Windows Server:
C:ProgramDatadockerconfigdaemon.json
- Docker Desktop for Mac / Docker Desktop for Windows: Click the Docker icon in the toolbar,select Preferences, then select Daemon. Click Advanced.
If the file is currently empty, paste the following:
![For For](/uploads/1/2/4/8/124852299/293452052.png)
If the file is not empty, add those two keys, making sure that the resultingfile is valid JSON. Be careful that every line ends with a comma (
,
) exceptfor the last line.Save the file, or in the case of Docker Desktop for Mac or Docker Desktop for Windows, save theconfiguration. Restart Docker.
Docker now exposes Prometheus-compatible metrics on port 9323.
Configure and run Prometheus
Prometheus runs as a Docker service on a Docker swarm.
Prerequisites
- One or more Docker engines are joined into a Docker swarm, using
docker swarm init
on one manager anddocker swarm join
on other managers and worker nodes. - You need an internet connection to pull the Prometheus image.
Copy one of the following configuration files and save it to
/tmp/prometheus.yml
(Linux or Mac) or C:tmpprometheus.yml
(Windows). Thisis a stock Prometheus configuration file, except for the addition of the Dockerjob definition at the bottom of the file. Docker Desktop for Mac and Docker Desktop for Windowsneed a slightly different configuration.Next, start a single-replica Prometheus service using this configuration.
Verify that the Docker target is listed at http://localhost:9090/targets/.
![Prometheus app Prometheus app](/uploads/1/2/4/8/124852299/181799824.jpg)
You can’t access the endpoint URLs directly if you use Docker Desktop for Mac or Docker Desktop for Windows.
Use Prometheus
Prometheus Ios Tool
Create a graph. Click the Graphs link in the Prometheus UI. Choose a metricfrom the combo box to the right of the Execute button, and clickExecute. The screenshot below shows the graph for
engine_daemon_network_actions_seconds_count
.The above graph shows a pretty idle Docker instance. Your graph might lookdifferent if you are running active workloads.
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To make the graph more interesting, create some network actions by startinga service with 10 tasks that just ping Docker non-stop (you can change theping target to anything you like):
Wait a few minutes (the default scrape interval is 15 seconds) and reloadyour graph.
When you are ready, stop and remove the
ping_service
service, so that youare not flooding a host with pings for no reason.Wait a few minutes and you should see that the graph falls back to the idlelevel.
Next steps
- Read the Prometheus documentation
- Set up some alerts