Gitlab minimal memory installation via docker.

docker-compose.yml

web:
  image: 'gitlab/gitlab-ee:latest'
  restart: always
  hostname: 'gitlab.example.com'
  environment:
    GITLAB_OMNIBUS_CONFIG: |
      external_url 'https://gitlab.example.com'
      # Add any other gitlab.rb configuration here, each on its own line
      puma['worker_processes'] = 0
      sidekiq['max_concurrency'] = 10
      prometheus_monitoring['enable'] = false
      gitlab_rails['env'] = {'MALLOC_CONF' => 'dirty_decay_ms:1000, muzzy_decay_ms:1000'}
      gitaly['cgroups_count'] = 2
      gitaly['cgroups_mountpoint'] = '/sys/fs/cgroup'
      gitaly['cgroups_hierarchy_root'] = 'gitaly'
      gitaly['cgroups_memory_enabled'] = true
      gitaly['cgroups_memory_limit'] = 250000
      gitaly['cgroups_cpu_enabled'] = true
      gitaly['cgroups_cpu_shares'] = 512
      gitaly['concurrency'] = [{'rpc' => "/gitaly.SmartHTTPService/PostReceivePack", 'max_per_repo' => 3}, {'rpc' => "/gitaly.SSHService/SSHUploadPack", 'max_per_repo' => 3}]
      gitaly['env'] = {'LD_PRELOAD' => '/opt/gitlab/embedded/lib/libjemalloc.so', 'MALLOC_CONF' => 'dirty_decay_ms:1000,muzzy_decay_ms:1000', 'GITALY_COMMAND_SPAWN_MAX_PARALLEL' => '2'}
  ports:
    - '80:80'
    - '443:443'
  volumes:
    - '/var/lib/gitlab/config:/etc/gitlab'
    - '/var/lib/gitlab/logs:/var/log/gitlab'
    - '/var/lib/gitlab/data:/var/opt/gitlab'

@vogdb:
Follow up: After updating to recent GitLab (GitLab CE ≥ 15.8.1), the memory issues (system lock ups that require rebooting) went away.

@strarsis thank you for the feedback. I will try it too.

@vogdb: Reminder: When updating GitLab, update first to latest minor release (e.g. from 14.8.2 to 14.8.9), then start GitLab and when it is running (Docker container status from health: starting to healthy), update to first minor version of the next major release (e.g. from 14.8.9. to 15.0.0). Then repeat until you reached the desired (usually the latest) GitLab release. Jumping releases often won't work and you have to downgrade back to the previous version and go up by minor version, as described above.

@strarsis ok, will do. Thanks again.

@vogdb: Note that with GitLab 17 the options sidekiq['max_concurrency'] and gitaly['ruby_max_rss'] were removed and have to be removed from docker-compose.yml in order to allow GitLab to start up (reconfiguration step during startup).

@strarsis Thanks! I'm still on the latest 15 >_<