Collects Docker container runtime metrics
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snap collector plugin - Docker

This plugin collects runtime metrics from Docker containers and its host machine. It gathers information about resource usage and performance characteristics.

It's used in the Snap framework.

  1. Getting Started
  2. Documentation
  3. Community Support
  4. Contributing
  5. License
  6. Acknowledgements

Getting Started

In order to use this plugin you need Docker Engine installed. Visit Install Docker Engine for detailed instructions how to do it.

Operating systems


You can get the pre-built binaries for your OS and architecture at snap's GitHub Releases page.

To build the plugin binary:

Fork Clone repo into $GOPATH/src/

$ git clone<yourGithubID>/snap-plugin-collector-docker.git

Build the plugin by running make within the cloned repo:

$ make

It may take a while to pull dependencies if you haven't had them already.

This builds the plugin in /build/

Configuration and Usage

Configuration parameters

  • Set environment variable PROCFS_MOUNT to point to the path where proc of host is mounted.


There are a number of other resources you can review to learn to use this plugin:

Notice, that this plugin using default docker server endpoint unix:///var/run/docker.sock to communicate with docker deamon. However, adding support for custom endpoints is on Roadmap.

Client instance ready for communication with the given // server endpoint. It will use the latest remote API version available in the // server.

Collected Metrics

The list of collected metrics is described in


Similar to dream levels in the movie Inception, we have different levels of examples:

  • LEVEL 0: Snap running on your system (Linux only).
  • LEVEL 1: Snap runs in a container.
  • LEVEL 2: Snap runs in a docker-in-docker container.

For the sake of ease-of-use, these examples are presented in reverse order.

Run example in a docker-in-docker container


Run example in a docker container (Linux or Darwin only)


Run example on your Linux system

Check if there is some running docker container(s):

$ docker ps

CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES
7720efd76bb8        ubuntu              "/bin/bash"         35 minutes ago      Up 35 minutes                           prickly_spence
ad5221e8ae73        ubuntu              "/bin/bash"         36 minutes ago      Up 36 minutes                           suspicious_mirzakhani

In one terminal window, start the Snap daemon (in this case with logging set to 1 and trust disabled):

$ snapd -l 1 -t 0

In another terminal window: Load snap-plugin-collector-docker plugin:

$ snapctl plugin load build/linux/x86_64/snap-plugin-collector-docker

Get file plugin for publishing, appropriate for Linux or Darwin:

$ wget


$ wget

Load file plugin for publishing:

$ snapctl plugin load snap-plugin-publisher-file

Another terminal window, you can list all of available metrics:

$ snapctl metric list

Create task manifest for writing to a file. You can also use an asterisk - see examples/tasks/docker-file.json for which all exposed metrics for all containers will be collected:

  "version": 1,
  "schedule": {
    "type": "simple",
    "interval": "1s"
  "workflow": {
    "collect": {
      "metrics": {
        "/intel/docker/*": {}
      "config": {},
      "publish": [
          "plugin_name": "file",
          "config": {
            "file": "/tmp/snap-docker-file.log"

Create a task by the following command:

$ snapctl task create -t examples/tasks/docker-file.json

Using Task Manifest to create task
Task created
ID: da941d6f-e137-4ef8-97cd-e2b73a8559fb
Name: Task-da941d6f-e137-4ef8-97cd-e2b73a8559fb
State: Running

See output from snapctl task watch

(notice, that below only the fragment of task watcher output has been presented)

$ snapctl task watch da941d6f-e137-4ef8-97cd-e2b73a8559fb

Watching Task (da941d6f-e137-4ef8-97cd-e2b73a8559fb):

NAMESPACE                                                                    DATA           TIMESTAMP

/intel/docker/7720efd76bb8/cgroups/cpu_stats/cpu_usage/total_usage           2.146646e+07       2016-06-21 12:44:09.551811277 +0200 CEST
/intel/docker/7720efd76bb8/cgroups/cpu_stats/cpu_usage/usage_in_kernelmode   1e+07              2016-06-21 12:44:09.552107446 +0200 CEST
/intel/docker/7720efd76bb8/cgroups/cpu_stats/cpu_usage/usage_in_usermode     0                  2016-06-21 12:44:09.552146203 +0200 CEST
/intel/docker/ad5221e8ae73/cgroups/cpu_stats/cpu_usage/total_usage           2.146646e+07       2016-06-21 12:44:09.551811277 +0200 CEST
/intel/docker/ad5221e8ae73/cgroups/cpu_stats/cpu_usage/usage_in_kernelmode   1e+07              2016-06-21 12:44:09.552107446 +0200 CEST
/intel/docker/ad5221e8ae73/cgroups/cpu_stats/cpu_usage/usage_in_usermode     0                  2016-06-21 12:44:09.552146203 +0200 CEST
/intel/docker/root/cgroups/cpu_stats/cpu_usage/total_usage                   2.88984998661e+12  2016-06-21 12:44:09.551811277 +0200 CEST
/intel/docker/root/cgroups/cpu_stats/cpu_usage/usage_in_kernelmode           6.38e+11            2016-06-21 12:44:09.552107446 +0200 CEST
/intel/docker/root/cgroups/cpu_stats/cpu_usage/usage_in_usermode             9.4397e+11          2016-06-21 12:44:09.552146203 +0200 CEST

(Keys ctrl+c terminate task watcher)

These data are published to file and stored there (in this example in /tmp/snap-docker-file.log).


This plugin is in active development. As we lauch this plugin, we have a few item in mind for the next release:

  • Support for custom docker endpoints different that default unix:///var/run/docker.sock As we launch this plugin, we do not have any outstanding requirements for the next release. If you have a feature request, please add it as an issue and/or submit a pull request.

Community Support

This repository is one of many plugins in the snap framework: a powerful telemetry framework. See the full project at To reach out to other users, head to the main framework


We love contributions!

There's more than one way to give back, from examples to blogs to code updates. See our recommended process in


snap, along with this plugin, is an Open Source software released under the Apache 2.0 License.


Thank you! Your contribution is incredibly important to us.