yum -y install policycoreutils openssh-server openssh-clients postfix2.启动ssh服务&设置为开机启动
systemctl enable sshd && sudo systemctl start sshd3.设置postfix开机自启，并启动，postfix支持gitlab发信功能
systemctl enable postfix && systemctl start postfix4.进入opt文件夹
cd /opt5.安装jdk
安装网址：CentOS7 64位虚拟机安装JDK完整步骤_顶尖高中生的博客-CSDN博客_虚拟机centos7安装jdk
6.yum安装policycoreutils-pythonyum install policycoreutils-python -y7.安装gitlab
rpm -ivh gitlab-ce-12.4.2-ce.0.el6.x86_64.rpm8.修改gitlab配置
vim /etc/gitlab/gitlab.rb
修改内容如下：
external_url 'http://主机地址:82' nginx['listen_port'] = 829.重载配置及启动gitlab
gitlab-ctl reconfigure
gitlab-ctl restart10.关闭防火墙
systemctl stop firewalld
