官网安装说明
https://about.gitlab.com/install/#centos-7

1.第一步

sudo yum install -y curl policycoreutils-python openssh-server
sudo systemctl enable sshd
sudo systemctl start sshd
sudo firewall-cmd --permanent --add-service=http
sudo systemctl reload firewalld

2.第二步

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

3.第三步

curl https://packages.gitlab.com/install/repositories/gitlab/gitlab-ee/script.rpm.sh | sudo bash
yum install -y gitlab-ee
gitlab-ctl reconfigure //如果没有启动gitlab再执行，我的没有启动
ps:这个时候就可以通过服务器的地址直接访问了,第一次进入需要修改密码,用户名root

4.启动/暂停/重启

gitlab-ctl start
gitlab-ctl stop
gitlab-ctl restart

5.修改端口

vim /etc/gitlab/gitlab.rb
external_url 'http://我的服务器地址:8081'
nginx['listen_port'] = 8081
vim /var/opt/gitlab/nginx/conf/gitlab-http.conf
listen *:8081;
server_name localhost;
if ($http_host = "") {
set $http_host_with_default "localhost:8081";
}
然后执行
gitlab-ctl restart