sudo yum install curl openssh-server
sudo systemctl enable sshd
sudo systemctl start sshd
sudo yum install postfix
sudo systemctl enable postfix
sudo systemctl start postfix
sudo firewall-cmd --permanent --add-service=http
sudo systemctl reload firewalld
curl https://packages.gitlab.com/install/repositories/gitlab/gitlab-ce/script.rpm.sh | sudo bash
sudo yum install gitlab-ce
sudo gitlab-ctl reconfigure
假如GitLab在访问的时候经常502，原因可能是内存不足，可以配置虚拟内存
sudo dd if=/dev/zero of=/swapfile bs=1024 count=2048k
sudo mkswap /swapfile
sudo swapon /swapfile
sudo vim /etc/fstab
访问http://xx.xx.xx.xx/，注册用户配置group和project即可