操作系统是ubuntu12.04，先下载gitlab deb，https://www.gitlab.com/downloads/

参考地址：https://gitlab.com/gitlab-org/omnibus-gitlab/blob/master/README.md

apt-get install postfix
wget https://downloads-packages.s3.amazonaws.com/gitlab_6.7.2-omnibus-1.ubuntu.12.04_amd64.deb
sudo dpkg -i gitlab_6.7.2-omnibus-1.ubuntu.12.04_amd64.deb
sudo gitlab-ctl reconfigure