### Summary DNS services are not available in the gitlab/gitlab-ce:latest container when run with parameters dewcribed in [Install GitLab using Docker Engine](https://docs.gitlab.com/omnibus/docker/README.html#install-gitlab-using-docker-engine) ### Steps to reproduce 1) execute: ```bash docker run --detach \ --hostname gitlab.gorrunyo.org \ --publish 4431:443 --publish 8081:80 --publish 2201:22 \ --name gitlab \ --restart unless-stopped \ --mount type=volume,src=gitlab-etc,dst=/etc/gitlab,volume-driver=local \ --mount type=volume,src=gitlab-log,dst=/var/log/gitlab,volume-driver=local \ --mount type=bind,src=/datapool/gitlab,dst=/var/opt/gitlab \ gitlab/gitlab-ee:latest ``` 2) Modify /etc/gitlab/gitlab.rb to enable mail functions. ```ruby ### Email Settings gitlab_rails['gitlab_email_enabled'] = true gitlab_rails['gitlab_email_from'] = 'gitlab.domain.org' gitlab_rails['gitlab_email_display_name'] = 'GitLab(Domain)' gitlab_rails['gitlab_email_reply_to'] = 'noreply@gdomain.org' gitlab_rails['gitlab_email_subject_suffix'] = '' gitlab_rails['gitlab_email_smime_enabled'] = false gitlab_rails['gitlab_email_smime_key_file'] = '/etc/gitlab/ssl/gitlab_smime.key' gitlab_rails['gitlab_email_smime_cert_file'] = '/etc/gitlab/ssl/gitlab_smime.crt' gitlab_rails['gitlab_email_smime_ca_certs_file'] = '/etc/gitlab/ssl/gitlab_smime_cas.crt' ### Reply by email ###! Allow users to comment on issues and merge requests by replying to ###! notification emails. ###! Docs: https://docs.gitlab.com/ee/administration/reply_by_email.html gitlab_rails['incoming_email_enabled'] = true #### Incoming Email Address ####! The email address including the `%{key}` placeholder that will be replaced ####! to reference the item being replied to. ####! **The placeholder can be omitted but if present, it must appear in the ####! "user" part of the address (before the `@`).** gitlab_rails['incoming_email_address'] = "user+%{key}@gmail.com" #### Email account username ####! **With third party providers, this is usually the full email address.** ####! **With self-hosted email servers, this is usually the user part of the ####! email address.** gitlab_rails['incoming_email_email'] = "user@gmail.com" #### Email account password gitlab_rails['incoming_email_password'] = "password" #### IMAP Settings gitlab_rails['incoming_email_host'] = "imap.gmail.com" gitlab_rails['incoming_email_port'] = 993 gitlab_rails['incoming_email_ssl'] = true gitlab_rails['incoming_email_start_tls'] = false #### Incoming Mailbox Settings (via `mail_room`) ####! The mailbox where incoming mail will end up. Usually "inbox". gitlab_rails['incoming_email_mailbox_name'] = "inbox" ### GitLab email server settings ###! Docs: https://docs.gitlab.com/omnibus/settings/smtp.html ###! **Use smtp instead of sendmail/postfix.** gitlab_rails['smtp_enable'] = true gitlab_rails['smtp_address'] = "smtp.gmail.com" gitlab_rails['smtp_port'] = 587 gitlab_rails['smtp_user_name'] = "user@gmail.com" gitlab_rails['smtp_password'] = "password" gitlab_rails['smtp_domain'] = "smtp.gmail.com" gitlab_rails['smtp_authentication'] = "login" gitlab_rails['smtp_enable_starttls_auto'] = true gitlab_rails['smtp_tls'] = false gitlab_rails['smtp_openssl_verify_mode'] = 'peer' ``` ### What is the current *bug* behavior? Gitlab cannot contact SMTP server Open console and execute: ```bash root@gitlab:/# ssh <local-dns-server-FQN> ssh: Could not resolve hostname uranus: Temporary failure in name resolution ``` but when executing: ```bash root@gitlab:/# ssh <local-dns-server-IP> The authenticity of host 'xxx.xxx.xxx.xxx (xxx.xxx.xxx.xxx)' can't be established. ECDSA key fingerprint is SHA256:xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx Are you sure you want to continue connecting (yes/no)? ``` ### What is the expected *correct* behavior? Gitlab can access SMTP server and send emails ### Relevant logs and/or screenshots ```log ==> /var/log/gitlab/mailroom/current <==, 2020-08-03_02:57:36.36007 bundler: failed to load command: mail_room (/opt/gitlab/embedded/bin/mail_room), 2020-08-03_02:57:36.36015 SocketError: getaddrinfo: Temporary failure in name resolution, 2020-08-03_02:57:36.36016 /opt/gitlab/embedded/lib/ruby/2.6.0/socket.rb:227:in `getaddrinfo', 2020-08-03_02:57:36.36018 /opt/gitlab/embedded/lib/ruby/2.6.0/socket.rb:227:in `foreach', 2020-08-03_02:57:36.36019 /opt/gitlab/embedded/lib/ruby/2.6.0/socket.rb:631:in `tcp', 2020-08-03_02:57:36.36020 /opt/gitlab/embedded/lib/ruby/2.6.0/net/imap.rb:1132:in `tcp_socket', 2020-08-03_02:57:36.36021 /opt/gitlab/embedded/lib/ruby/2.6.0/net/imap.rb:1089:in `initialize', 2020-08-03_02:57:36.36023 /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/gitlab-mail_room-0.0.6/lib/mail_room/connection.rb:80:in `new', 2020-08-03_02:57:36.36024 /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/gitlab-mail_room-0.0.6/lib/mail_room/connection.rb:80:in `imap', 2020-08-03_02:57:36.36025 /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/gitlab-mail_room-0.0.6/lib/mail_room/connection.rb:90:in `log_in', 2020-08-03_02:57:36.36027 /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/gitlab-mail_room-0.0.6/lib/mail_room/connection.rb:72:in `setup', 2020-08-03_02:57:36.36028 /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/gitlab-mail_room-0.0.6/lib/mail_room/connection.rb:8:in `initialize', 2020-08-03_02:57:36.36029 /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/gitlab-mail_room-0.0.6/lib/mail_room/mailbox_watcher.rb:59:in `new', 2020-08-03_02:57:36.36032 /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/gitlab-mail_room-0.0.6/lib/mail_room/mailbox_watcher.rb:59:in `connection', 2020-08-03_02:57:36.36033 /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/gitlab-mail_room-0.0.6/lib/mail_room/mailbox_watcher.rb:29:in `run', 2020-08-03_02:57:36.36035 /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/gitlab-mail_room-0.0.6/lib/mail_room/coordinator.rb:19:in `each', 2020-08-03_02:57:36.36036 /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/gitlab-mail_room-0.0.6/lib/mail_room/coordinator.rb:19:in `run', 2020-08-03_02:57:36.36037 /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/gitlab-mail_room-0.0.6/lib/mail_room/cli.rb:58:in `start', 2020-08-03_02:57:36.36038 /opt/gitlab/embedded/lib/ruby/gems/2.6.0/gems/gitlab-mail_room-0.0.6/bin/mail_room:5:in `<top (required)>', 2020-08-03_02:57:36.36040 /opt/gitlab/embedded/bin/mail_room:23:in `load', 2020-08-03_02:57:36.36041 /opt/gitlab/embedded/bin/mail_room:23:in `<top (required)>', 2020-08-03_02:57:36.37098 Runit: waiting 5 seconds before restarting mail_room, ``` ### Output of checks (If you are reporting a bug on GitLab.com, write: This bug happens on GitLab.com) #### Results of GitLab environment info <details> <summary>Expand for output related to GitLab environment info</summary> <pre> (For installations with omnibus-gitlab package run and paste the output of: `sudo gitlab-rake gitlab:env:info`) (For installations from source run and paste the output of: `sudo -u git -H bundle exec rake gitlab:env:info RAILS_ENV=production`) </pre> </details> #### Results of GitLab application Check <details> <summary>Expand for output related to the GitLab application check</summary> <pre> Checking GitLab subtasks ... Checking GitLab Shell ... GitLab Shell: ... GitLab Shell version >= 13.3.0 ? ... OK (13.3.0) Running /opt/gitlab/embedded/service/gitlab-shell/bin/check Internal API available: OK Redis available via internal API: OK gitlab-shell self-check successful Checking GitLab Shell ... Finished Checking Gitaly ... Gitaly: ... default ... OK Checking Gitaly ... Finished Checking Sidekiq ... Sidekiq: ... Running? ... yes Number of Sidekiq processes ... 1 Checking Sidekiq ... Finished Checking Incoming Email ... Incoming Email: ... Checking Reply by email ... IMAP server credentials are correct? ... Checking gitlab.gorrunyo@gmail.com no Try fixing it: An error occurred: SocketError: getaddrinfo: Temporary failure in name resolution Check that the information in config/gitlab.yml is correct For more information see: doc/administration/reply_by_email.md Please fix the error above and rerun the checks. Init.d configured correctly? ... skipped MailRoom running? ... skipped Checking Reply by email ... Finished Checking Incoming Email ... Finished Checking LDAP ... LDAP: ... LDAP is disabled in config/gitlab.yml Checking LDAP ... Finished Checking GitLab App ... Git configured correctly? ... yes Database config exists? ... yes All migrations up? ... yes Database contains orphaned GroupMembers? ... no GitLab config exists? ... yes GitLab config up to date? ... yes Log directory writable? ... yes Tmp directory writable? ... yes Uploads directory exists? ... yes Uploads directory has correct permissions? ... yes Uploads directory tmp has correct permissions? ... yes Init script exists? ... skipped (omnibus-gitlab has no init script) Init script up-to-date? ... skipped (omnibus-gitlab has no init script) Projects have namespace: ... can't check, you have no projects Redis version >= 4.0.0? ... yes Ruby version >= 2.5.3 ? ... yes (2.6.6) Git version >= 2.22.0 ? ... yes (2.27.0) Git user has default SSH configuration? ... yes Active users: ... 2 Is authorized keys file accessible? ... yes GitLab configured to store new projects in hashed storage? ... yes All projects are in hashed storage? ... yes Elasticsearch version 6.x - 7.x? ... skipped (elasticsearch is disabled) Checking GitLab App ... Finished Checking GitLab subtasks ... Finished </pre> </details> ### Possible fixes (If you can, link to the line of code that might be responsible for the problem)