How to enable IPv6 or Dual Stack for self-hosted GitLab instance
The default installation for a self-hosted GitLab does not enable IPv6
You can verify it by running below command:
ss -tunpl | grep 443
tcp LISTEN 0 511 0.0.0.0:443 0.0.0.0:*As you can see above, GitLab only listened the 0.0.0.0 address which means only IPv4 request is available.
If you want IPv6 enabled, you can update file /etc/gitlab/gitlab.rb,
and uncomment below configuration.
# nginx['listen_addresses'] = ['*', '[::]']
# registry_nginx['listen_addresses'] = ['*', '[::]']
# mattermost_nginx['listen_addresses'] = ['*', '[::]']
# pages_nginx['listen_addresses'] = ['*', '[::]']This configuration tells Nginx(GitLab) to listen any address and '[::]'(which is the 0.0.0.0 address in IPv6).
After that, run reconfigure to activate the updated config:
gitlab-ctl reconfigureNow you can check whether GitLab is listening on IPv6:
ss -tunpl | grep 443
tcp LISTEN 0 511 0.0.0.0:443 0.0.0.0:* users:(("nginx",pid=1856703,fd=7),("nginx",pid=1856702,fd=7),("nginx",pid=1856701,fd=7),("nginx",pid=1856700,fd=7),("nginx",pid=1856699,fd=7))
tcp LISTEN 0 511 [::]:443 [::]:* users:(("nginx",pid=1856703,fd=8),("nginx",pid=1856702,fd=8),("nginx",pid=1856701,fd=8),("nginx",pid=1856700,fd=8),("nginx",pid=1856699,fd=8))If you see [::]:443 in the output, you know IPv6 is ready for you.