1、gitlab是什么
gitlab是git仓库的管理工具，提供web页面方便用户使用。
gitlab-ce和gitlab-ee，ce是社区版，ee是企业版，企业版有些功能需要付费使用。
2、从官方仓库上安装gitlab
添加官方仓库： curl -L https://packages.gitlab.com/install/repositories/gitlab/gitlab-ce/script.rpm.sh | sudo bash
3、安装postfix sudo yum install postfix
sudo systemctl enable postfix
sudo systemctl start postfix
4、安装gitlab yum install gitlab-ce
5、安装完成后会有提示信息Thank you for installing GitLab!
GitLab was unable to detect a valid hostname for your instance.
Please configure a URL for your GitLab instance by setting `external_url`
configuration in /etc/gitlab/gitlab.rb file.
Then, you can start your GitLab instance by running the following command:
sudo gitlab-ctl reconfigure
For a comprehensive list of configuration options please see the Omnibus GitLab readme
https://gitlab.com/gitlab-org/omnibus-gitlab/blob/master/README.md
GitLab now ships with a newer version of PostgreSQL (11.7), but it is not yet
enabled by default. To upgrade, please see:
https://docs.gitlab.com/omnibus/settings/database.html#upgrade-packaged-postgresql-server
6、编辑/etc/gitlab/gitlab.rb
将：# nginx['listen_port'] = nil
修改为：nginx['listen_port'] = 8888
将：external_url 'http://gitlab.example.com'
修改为：external_url 'http://你的IP地址:8888'
注：这里external_url需要加上端口，否则使用http克隆和查看文件，链接里会没有端口