文档地址：https://packages.gitlab.com/gitlab/gitlab-ce

一、安装gitlab所需依赖(如果没有)

$ sudo yum install curl openssh-server openssh-clients postfix cronie  

安装之前可以先检查一下系统是否已经安装了上面的工具，如果已安装过就不用再安装了。

二、安装gitlab

$ curl -s https://packages.gitlab.com/install/repositories/gitlab/gitlab-ce/script.rpm.sh | sudo bash
$ dnf install -y gitlab-ce

三、配置ssl证书

$ mkdir -p /etc/gitlab/ssl

$ cd /etc/gitlab/ssl

$ openssl genrsa -out "/etc/gitlab/ssl/gitlab.example.com.key" 2048

$ openssl req -new -key "/etc/gitlab/ssl/gitlab.lwt.com.key" -out "/etc/gitlab/ssl/gitlab.lwt.com.csr"

$ openssl x509 -req -days 365 -in "/etc/gitlab/ssl/gitlab.lwt.com.csr" -signkey "/etc/gitlab/ssl/gitlab.lwt.com.key" -out "/etc/gitlab/ssl/gitlab.lwt.com.crt"

$ openssl dhparam -out /etc/gitlab/ssl/dhparams.pem 2048
# 修改权限
$ chmod 600 *

# 修改gitlab.rb中的下面三项配置为前面步骤所创建的文件
# nginx['ssl_certificate'] = "/etc/gitlab/ssl/gitlab.example.com.crt"
# nginx['ssl_certificate_key'] = "/etc/gitlab/ssl/gitlab.lwt.com.key"
# nginx['ssl_dhparam'] = "/etc/gitlab/ssl/dhparams.pem"
$ vim /etc/gitlab/gitlab.rb

四、 初始化gitlab相关配置

# 初始化gitlab相关配置
$ gitlab-ctl reconfigure

五、修改/var/opt/gitlab/nginx/conf/gitlab-http.conf

server_name gitlab.example.com;
rewrite ^(.*)$ https://$host$1 permangent

六、重启gitlab服务

$ sudo gitlab-ctl restart

七、将gitlab服务器ip地址和上面配置的域名（gitlab.example.com）的对于关系配置到客户端电脑上（可选，可以直接使用ip访问）

window:(C:\Windows\System32\drivers\etc\hosts)

gitlabip gitlab.example.com

linux:(vim /etc/hosts)

gitlabip gitlab.example.com

ps：在Centos8上安装新版本的gitlab好像需要内存在2G以上，内存不足2G时初始化配置时会报错：

* Errno::ENOMEM occurred in delayed notification: execute[reload all sysctl conf] (package::sysctl line 18) had an error: Errno::ENOMEM: Cannot allocate memory - fork(2)
* Errno::ENOMEM occurred in delayed notification: runit_service[gitlab-workhorse] (gitlab::gitlab-workhorse line 49) had an error: Errno::ENOMEM: Cannot allocate memory - fork(2)