Tips1: 禁止登录
登录服务器修改数据库

$ sudo -u gitlab-psql /opt/gitlab/embedded/bin/psql -h /var/opt/gitlab/postgresql gitlabhq_production    
update application_settings set signin_enabled=true;

Tips2: 忘记密码 登录服务器，进入console修改

$ sudo gitlab-rails console production  
user = User.find(1)  
user.password = "xxxxx"  
user.save