1.

sudo yum install -y curl policycoreutils-python openssh-server perl
# Enable OpenSSH server daemon if not enabled: sudo systemctl status sshd
sudo systemctl enable sshd
sudo systemctl start sshd
# Check if opening the firewall is needed with: sudo systemctl status firewalld
sudo firewall-cmd --permanent --add-service=http
sudo firewall-cmd --permanent --add-service=https
sudo systemctl reload firewalld

2.

sudo yum install postfix
sudo systemctl enable postfix
sudo systemctl start postfix

3.

curl https://packages.gitlab.com/install/repositories/gitlab/gitlab-ee/script.rpm.sh | sudo bash

4.

EXTERNAL_URL="自己的主机 + 端口" yum install -y gitlab-ee

5.

去 /etc/gitlab/initial_root_password 下获取初始密码，这个密码 24 小时有效。所以，在安装完成后使用 root 账号和这个密码登录，进行密码修改。

常用命令

gitlab-ctl start # 启动 gitlab