
This container inherits from travix/gocd-agent-gcloud:latest and adds the following packages
To run this docker container use the following command
shdocker run -d travix/gocd-agent-gcloud-python-2.7:latest
In order to configure the agent for use in your cluster with other than default settings you can pass in the following environment variables
| Name | Description | Default value |
|---|---|---|
| GO_SERVER | The host name or ip address of the server to connect to | localhost |
| GO_SERVER_PORT | The http port of the go server | 8153 |
| AGENT_MEM | The -Xms value for the java vm | 128m |
| AGENT_MAX_MEM | The -Xmx value for the java vm | 256m |
| AGENT_KEY | The secret key set on the server for auto-registration of the agent | |
| AGENT_RESOURCES | The resource tags for the agent in case of auto-registration | |
| AGENT_ENVIRONMENTS | The environments the agent is assigned to in case of auto-registration | |
| AGENT_HOSTNAME | The hostname used for the agent; normally it's the hosts actual hostname | |
| DOCKER_GID_ON_HOST | To mount docker socket and use it without sudo the go user needs to be added to the docker group; pass in the gid from the guest os with this variable |
To connect the agent to your server with other than default ip or hostname
shdocker run -d \ -e "GO_SERVER=gocd.yourdomain.com" \ travix/gocd-agent-gcloud-python-2.7:latest
If you've set up your server for autoregistration of agents pass in the same value for environment variable AGENT_KEY when starting the agent
shdocker run -d \ -e "GO_SERVER=gocd.yourdomain.com" \ -e "AGENT_KEY=388b633a88de126531afa41eff9aa69e" \ travix/gocd-agent-gcloud-python-2.7:latest
You can also set resource tags, gocd environment and hostname for the agent when autoregistering
shdocker run -d \ -e "GO_SERVER=gocd.yourdomain.com" \ -e "AGENT_KEY=388b633a88de126531afa41eff9aa69e" \ -e "AGENT_RESOURCES=deploy-x,deploy-z" \ -e "AGENT_ENVIRONMENTS=Production" \ -e "AGENT_HOSTNAME=deploy-agent-01" \ travix/gocd-agent-gcloud-python-2.7:latest
To mount docker socket and be able to use it sudo-less inside the container use the following
shdocker run -d \ -e "GO_SERVER=gocd.yourdomain.com" \ -e "DOCKER_GID_ON_HOST=$(getent group docker | cut -d: -f3)" \ -v /var/run/docker.sock:/var/run/docker.sock \ -v /usr/bin/docker:/usr/bin/docker \ travix/gocd-agent-gcloud-python-2.7:latest
Do be aware that mounting docker inside your container poses a large security risk as the container indirectly has access to the whole machine in this way.
In order to keep working copies over a restart and use ssh keys from the host machine you can mount the following directories
| Directory | Description | Importance |
|---|---|---|
| /var/lib/go-agent/pipelines | This directory holds the working copies for all pipelines that have run on this agent | You want to have this cleaned up regularly anyway, so no real need to mount it |
| /var/log/go-agent | All output logs go here, but there also written to standard out in the container | Preferably collect logs from standard out |
| /var/go/.ssh | The ssh keys to connect to version control systems like github and bitbucket | As it's better not to embed these keys in the container you likely need to mount this |
| /var/go/.gcloud | The google cloud service account key files can be stored here | As it's better not to embed these keys in the container you likely need to mount this |
| /var/run/docker.sock | To mount the docker socket of the guest os | Note: mounting this is a security risk! |
| /usr/bin/docker | To mount the docker binary of the guest os | Note: mounting this is a security risk! |
Start the container like this to mount the directories
shdocker run -d \ -e "GO_SERVER=gocd.yourdomain.com" \ -e "AGENT_KEY=388b633a88de126531afa41eff9aa69e" \ -e "AGENT_RESOURCES=deploy-x,deploy-z" \ -e "AGENT_ENVIRONMENTS=Production" \ -e "AGENT_HOSTNAME=deploy-agent-01" \ -v /mnt/persistent-disk/gocd-agent/pipelines:/var/lib/go-agent/pipelines -v /mnt/persistent-disk/gocd-agent/logs:/var/log/go-agent -v /mnt/persistent-disk/gocd-agent/ssh:/var/go/.ssh -v /mnt/persistent-disk/gocd-agent/gcloud:/var/go/.gcloud -v /var/run/docker.sock:/var/run/docker.sock \ -v /usr/bin/docker:/usr/bin/docker \ travix/gocd-agent-gcloud-python-2.7:latest
To make sure the process in the container can read and write to those directories create a user and group with same gid and uid on the host machine
shgroupadd -r -g 999 go useradd -r -g go -u 999 go
And then change the owner of the host directories
shchown -R go:go /mnt/persistent-disk/gocd-agent/pipelines chown -R go:go /mnt/persistent-disk/gocd-agent/ssh chown -R go:go /mnt/persistent-disk/gocd-agent/gcloud
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