1. 安装依赖

sudo yum install curl openssh-server openssh-clients postfix cronie
sudo service postfix start  
sudo chkconfig postfix on  
sudo lokkit -s http -s ssh

2. 添加GitLab package server

curl -s https://packages.gitlab.com/install/repositories/gitlab/gitlab-ce/script.rpm.sh | sudo bash  
sudo yum install gitlab-ce-8.5.0-ce.1.el6.x86_64

3. 安装

sudo rpm -i gitlab-ce-8.5.0-ce.1.el6.x86_64.rpm

4. 配置

sudo gitlab-ctl reconfigure

5. 配置邮件服务

sudo yum install postfix
yum install cyrus*