GoCD Server Docker image

An alpine based docker image for GoCD server.

Issues, feedback?

Please make sure to log them at https://github.com/gocd/gocd.

Usage

Start the container with this:

docker run -d -p8153:8153 gocd/gocd-server:v21.2.0

This will expose container ports 8153(http) onto your server. You can now open http://localhost:8153

Available configuration options

Mounting volumes

The GoCD server will store all configuration, pipeline history database, artifacts, plugins, and logs into /godata. If you'd like to provide secure credentials like SSH private keys among other things, you can mount /home/go

docker run -v /path/to/godata:/godata -v /path/to/home-dir:/home/go gocd/gocd-server:v21.2.0

Note: Ensure that /path/to/home-dir and /path/to/godata is accessible by the go user in container (go user - uid 1000).

Installing plugins

All plugins can be installed under /godata.

Installing plugins using an environment configuration

To install plugins, just add an ENV variable with the prefix GOCD_PLUGIN_INSTALL_ and your name as suffix and the value being the download URL. The plugin will only be downloaded if not yet present.

An example example would be GOCD_PLUGIN_INSTALL_docker-elastic-agents=https://github.com/gocd-contrib/docker-elastic-agents/releases/download/v0.8.0/docker-elastic-agents-0.8.0.jar:

docker run \
  -e GOCD_PLUGIN_INSTALL_docker-elastic-agents=https://github.com/gocd-contrib/docker-elastic-agents/releases/download/v0.8.0/docker-elastic-agents-0.8.0.jar \
  gocd/gocd-server:v21.2.0

To install multiple plugins, add several -e arguments as such:

docker run \
  -e GOCD_PLUGIN_INSTALL_a-plugin=https://example.com/a-plugin.jar \
  -e GOCD_PLUGIN_INSTALL_b-plugin=https://example.com/b-plugin.jar \
  gocd/gocd-server:v21.2.0

Installing plugins using a custom entry-point script (see below)

mkdir -p /godata/plugins/external
curl --location --fail https://example.com/plugin.jar > /path/to/godata/plugins/external/plugin.jar
chown -R 1000 /godata/plugins/external

Loading configuration from existing git repo

To load existing configuration from git repo, just add an ENV variable CONFIG_GIT_REPO. Auth token may be used to access private repo. Branch master would be cloned by default. To load another branch, define an ENV variable CONFIG_GIT_BRANCH. If /godata/config already is git repo then CONFIG_GIT_REPO will be ignored. Cloned repo must contain all files from /godata/config dir.

docker run \
  -e CONFIG_GIT_REPO=https://gocd_user:<password_or_auth_token>/config.git \
  -e CONFIG_GIT_BRANCH=branch_with_config \
  gocd/gocd-server:v21.2.0

Checkouted content would overwrite files in /godata/config/.

Running custom entrypoint scripts

To execute custom script(s) during the container boostrap, but before the GoCD server starts just add -v /path/to/your/script.sh:/docker-entrypoint.d/your-script.sh like so:

docker run -v /path/to/your/script.sh:/docker-entrypoint.d/your-script.sh ... gocd/gocd-server:v21.2.0

If you have several scripts in a directory that you'd like to execute:

docker run -v /path/to/script-dir:/docker-entrypoint.d ... gocd/gocd-server:v21.2.0

Note: Ensure that your scripts are executable chmod a+x — you can add as many scripts as you like, bash is available on the container. If your script uses other scripting language (perl, python), please ensure that the scripting language is installed in the container.

Installing addons

All addons can be installed under /godata.

mkdir -p /path/to/godata/addons
curl --location --fail https://example.com/addon.jar > /path/to/godata/addons/plugin.jar
chown -R 1000 /path/to/godata/addons

Tweaking JVM options (memory, heap etc)

JVM options can be tweaked using the environment variable GOCD_SERVER_JVM_OPTS.

docker run -e GOCD_SERVER_JVM_OPTS="-Xmx4096mb -Dfoo=bar" gocd/gocd-server:v21.2.0

Under the hood

The GoCD server runs as the go user, the location of the various directories is:

Determine Server IP and Ports on Host

Once the GoCD server is up, we should be able to determine its ip address and the ports mapped onto the host by doing the following: The IP address and ports of the GoCD server in a docker container are important to know as they will be used by the GoCD agents to connect to it. If you have started the container with

docker run --name server -it -p8153:8153 gocd/gocd-server:v21.2.0

Then, the below commands will determine to GoCD server IP, server port and ssl port

docker inspect --format='{{(index (index .NetworkSettings.IPAddress))}}' server
docker inspect --format='{{(index (index .NetworkSettings.Ports "8153/tcp") 0).HostPort}}' server

Running GoCD Containers as Non Root

With release v19.6.0, GoCD containers will run as non-root user, by default. The Dockerized GoCD application will run with user go (uid: 1000) and group root (gid: 0) instead of running as user root (uid: 0) and group root (gid: 0). For more information, checkout Running Dockerized GoCD Containers as Non Root blog post.

Troubleshooting

The GoCD server does not come up

• Check if the docker container is running docker ps -a
• Check the STDOUT to see if there is any output that indicates failures docker logs CONTAINER_ID
• Check the server logs docker exec -it CONTAINER_ID tail -f /godata/logs/go-server.log (or check the log file in the volume mount, if you're using one)

License

Copyright 2021 ThoughtWorks, Inc.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.