Run docker-compose in user jenkins

[hieuhtr]

Problem:

• Jenkins CI Instance

• Have a job in jenkins need to run docker-compose build

  jenkins@CI:~/workspace/staging-backend$ docker-compose build
  redis uses an image, skipping
  elasticsearch uses an image, skipping  
  mysql uses an image, skipping
  Building webapp
  ERROR: Couldn't connect to Docker daemon at http+docker://localunixsocket - is it running?
  
  If it's at a non-standard location, specify the URL with the DOCKER_HOST environment variable.

• More details (confusing error logs)

  jenkins@CI:~/workspace/staging-backend$ docker-compose --verbose build
  compose.config.config.find: Using configuration files: ./docker-compose.yml
  docker.auth.find_config_file: Trying paths: ['/var/lib/jenkins/.docker/config.json', '/var/lib/jenkins/.dockercfg']
  docker.auth.find_config_file: No config file found
  Traceback (most recent call last):
  File "bin/docker-compose", line 3, in <module>
  File "compose/cli/main.py", line 68, in main
  File "compose/cli/main.py", line 115, in perform_command
  File "compose/cli/command.py", line 37, in project_from_options
  File "compose/cli/command.py", line 99, in get_project
  File "compose/cli/command.py", line 74, in get_client
  File "site-packages/docker/api/daemon.py", line 177, in version
  File "site-packages/docker/utils/decorators.py", line 46, in inner
  File "site-packages/docker/api/client.py", line 189, in _get
  File "site-packages/requests/sessions.py", line 488, in get
  File "site-packages/requests/sessions.py", line 475, in request
  File "site-packages/requests/sessions.py", line 596, in send
  File "site-packages/requests/adapters.py", line 473, in send
  requests.exceptions.ConnectionError: ('Connection aborted.', error(13, 'Permission denied'))
  Failed to execute script docker-compose

Root cause & Solution:

User jenkins doesn't have permission to read/write docker unix socket

$ ls -l /var/run/docker.sock
srw-rw---- 1 root docker 0 Aug 14 09:21 /var/run/docker.sock

Switch to user ubuntu/root to add user jenkins to docker group Try to run the following command to add to the group

$ sudo usermod -a -G docker jenkins

Run the following command to find out what groups you belong to

# groups $USER
$ groups ubuntu
ubuntu : ubuntu adm dialout cdrom floppy sudo audio dip video plugdev netdev lxd docker

Restart jenkins service, and logout-login jenkins to apply

Export environment:

$ export DOCKER_HOST=127.0.0.1