1.准备一台Centos7环境。
如果是Window环境参考以下博客：

[WINDOWS7五步快速搭建Centos7环境](https://blog.csdn.net/doegoo/article/details/80061524)

2.安装前准备

参考官方文档：
[https://about.gitlab.com/installation/#centos-7]
安装相关工具类：
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

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

3.配置国内YUM源

参考清华源：
[清华源官网](https://mirror.tuna.tsinghua.edu.cn/help/gitlab-ce/)
执行以下命令：
新建 /etc/yum.repos.d/gitlab-ce.repo，内容为
[gitlab-ce]
name=Gitlab CE Repository
baseurl=https://mirrors.tuna.tsinghua.edu.cn/gitlab-ce/yum/el$releasever/
gpgcheck=0
enabled=1

执行命令：
sudo yum makecache
sudo yum install gitlab-ce

4.安装gitlab-ce

sudo EXTERNAL_URL="http://gitlab.自已的域名.com" yum install -y gitlab-ee
或者：
sudo yum install -y gitlab-ee

5.启动gitlab-ce

sudo gitlab-ctl reconfigure
可使用 sudo vim /etc/gitlab/gitlab.rb 修改配置在执行以上命令重新加载
sudo gitlab-ctl status查看状态 出现在以下状态安装成功：
[vagrant@localhost ~]$ sudo gitlab-ctl status
run: gitaly: (pid 593) 1377s; run: log: (pid 592) 1377s
run: gitlab-monitor: (pid 611) 1377s; run: log: (pid 602) 1377s
run: gitlab-workhorse: (pid 610) 1377s; run: log: (pid 599) 1377s
run: logrotate: (pid 609) 1377s; run: log: (pid 591) 1377s
run: nginx: (pid 607) 1377s; run: log: (pid 594) 1377s
run: node-exporter: (pid 601) 1377s; run: log: (pid 600) 1377s
run: postgres-exporter: (pid 587) 1377s; run: log: (pid 586) 1377s
run: postgresql: (pid 589) 1377s; run: log: (pid 588) 1377s
run: prometheus: (pid 606) 1377s; run: log: (pid 605) 1377s
run: redis: (pid 608) 1377s; run: log: (pid 590) 1377s
run: redis-exporter: (pid 583) 1377s; run: log: (pid 582) 1377s
run: sidekiq: (pid 585) 1377s; run: log: (pid 584) 1377s
run: unicorn: (pid 604) 1377s; run: log: (pid 603) 1377s