1. install docker
   apt-get install docker.io - old ver (works good); see docker site for newer ver

2. install gitlab-ci-multi-runner (instructions in off repo)

3. connect runner to coordinator via command: gitlab-runner register (and follow instructions)
   user "shell" mode

4. edit visudo via command: visudo
   add to the end of the file: gitlab-runner ALL=(ALL) NOPASSWD: ALL
   save file and exit
   (this allows executing sudo commands without asking for password for runner)

5. in coordinator machine - in GitLab web interface set runner to run particular proj

NOW you can user runner

additional software

6. htop - monitor activity, process manager
7. dstat - log cpu,mem,nwk usage

1. symptm: build output hangs and build never ends; runner logs 400 Bad Request err (when submitting log to coordinator)
   SOLUTION:
   make sure /tmp partition size if enough for build log outputs
   sometimes its 1MB and it's not enougth for long build logs
   TO MAKE THIS PARTITION LARGER (100MB) exec commands:
   sudo umount /tmp
   sudo mount -t tmpfs -o size=104857600,mode=1777 overflow /tmp