# sudo vim /etc/gitlab/gitlab.rb

external_url 'http://10.10.10.10:81'  // Change to your IP
unicorn['port'] = 81
nginx['listen_port'] = 81
ci_nginx['listen_port'] = 81
mattermost_nginx['listen_port'] = 81
pages_nginx['listen_port'] = 81

# sudo gitalb-ctl reconfigure