1、停止unicorn、sidekiq：gitlab-ctl 衡痕贤伎stop unicorngitlab-ctl stop sidekiq
2、如果从7.3.0升级，记得关闭nginx：gitlab-ctl stop nginx
3、创建数据备份，防止更新失败：gitlab-rake gitlab:backup:create
4、安装升级包：rpm -Uvhgitlab-7.4.2_omnibus-1.el6.x86_64.rpm
5、重新加载配置：gitlab-ctl reconfigure
6、重启Gitlab服务：gitlab-ctl restart
