Docker
Docker
Plugin: go.d.plugin Module: docker
Overview
This collector monitors Docker containers state, health status and more.
It connects to the Docker instance via a TCP or UNIX socket and executes the following commands:
This collector is supported on all platforms.
This collector supports collecting metrics from multiple instances of this integration, including remote instances.
Requires netdata user to be in the docker group.
Default Behavior
Auto-Detection
It discovers instances running on localhost by attempting to connect to a known Docker UNIX socket: /var/run/docker.sock.
Limits
The default configuration for this integration does not impose any limits on data collection.
Performance Impact
Enabling collect_container_size may result in high CPU usage depending on the version of Docker Engine.
Setup
Prerequisites
No action required.
Configuration
File
The configuration file name for this integration is go.d/docker.conf.
You can edit the configuration file using the edit-config script from the
Netdata config directory.
cd /etc/netdata 2>/dev/null || cd /opt/netdata/etc/netdata
sudo ./edit-config go.d/docker.conf
Options
The following options can be defined globally: update_every, autodetection_retry.
| Name | Description | Default | Required |
|---|---|---|---|
| update_every | Data collection frequency. | 1 | no |
| autodetection_retry | Recheck interval in seconds. Zero means no recheck will be scheduled. | 0 | no |
| address | Docker daemon’s listening address. When using a TCP socket, the format is: tcp://[ip]:[port] | unix:///var/run/docker.sock | yes |
| timeout | Request timeout in seconds. | 2 | no |
| collect_container_size | Whether to collect container writable layer size. | no | no |
Examples
Basic
An example configuration.
jobs:
- name: local
address: 'unix:///var/run/docker.sock'
Multi-instance
Note: When you define multiple jobs, their names must be unique.
Collecting metrics from local and remote instances.
jobs:
- name: local
address: 'unix:///var/run/docker.sock'
- name: remote
address: 'tcp://203.0.113.10:2375'
Metrics
Metrics grouped by scope.
The scope defines the instance that the metric belongs to. An instance is uniquely identified by a set of labels.
Per Docker instance
These metrics refer to the entire monitored application.
This scope has no labels.
Metrics:
| Metric | Dimensions | Unit |
|---|---|---|
| docker.containers_state | running, paused, stopped | containers |
| docker.containers_health_status | healthy, unhealthy, not_running_unhealthy, starting, no_healthcheck | containers |
| docker.images | active, dangling | images |
| docker.images_size | size | bytes |
Per container
Metrics related to containers. Each container provides its own set of the following metrics.
Labels:
| Label | Description |
|---|---|
| container_name | The container’s name |
| image | The image name the container uses |
Metrics:
| Metric | Dimensions | Unit |
|---|---|---|
| docker.container_state | running, paused, exited, created, restarting, removing, dead | state |
| docker.container_health_status | healthy, unhealthy, not_running_unhealthy, starting, no_healthcheck | status |
| docker.container_writeable_layer_size | writeable_layer | size |
Alerts
The following alerts are available:
| Alert name | On metric | Description |
|---|---|---|
| docker_container_unhealthy | docker.container_health_status | ${label:container_name} docker container health status is unhealthy |
Troubleshooting
Debug Mode
To troubleshoot issues with the docker collector, run the go.d.plugin with the debug option enabled. The output
should give you clues as to why the collector isn’t working.
-
Navigate to the
plugins.ddirectory, usually at/usr/libexec/netdata/plugins.d/. If that’s not the case on your system, opennetdata.confand look for thepluginssetting under[directories].cd /usr/libexec/netdata/plugins.d/ -
Switch to the
netdatauser.sudo -u netdata -s -
Run the
go.d.pluginto debug the collector:./go.d.plugin -d -m docker
Getting Logs
If you’re encountering problems with the docker collector, follow these steps to retrieve logs and identify potential issues:
- Run the command specific to your system (systemd, non-systemd, or Docker container).
- Examine the output for any warnings or error messages that might indicate issues. These messages should provide clues about the root cause of the problem.
System with systemd
Use the following command to view logs generated since the last Netdata service restart:
journalctl _SYSTEMD_INVOCATION_ID="$(systemctl show --value --property=InvocationID netdata)" --namespace=netdata --grep docker
System without systemd
Locate the collector log file, typically at /var/log/netdata/collector.log, and use grep to filter for collector’s name:
grep docker /var/log/netdata/collector.log
Note: This method shows logs from all restarts. Focus on the latest entries for troubleshooting current issues.
Docker Container
If your Netdata runs in a Docker container named “netdata” (replace if different), use this command:
docker logs netdata 2>&1 | grep docker