Install GitLab

wget -q --no-check-certificate https://raw.githubusercontent.com/panticz/installit/master/install.gitlab.sh -O - | bash -

#!/bin/bash

# ensure that this script is run by root
if [ $(id -u) -ne 0 ]; then
    sudo $0
    exit
fi

# install required packages
apt-get install -y ca-certificates curl cron

#  bypass the apt-cacher-ng proxy
echo 'Acquire::HTTP::Proxy::packages.gitlab.com "DIRECT";' > /etc/apt/apt.conf.d/99_gitlab

# download GitLab installation script
curl -s https://packages.gitlab.com/install/repositories/gitlab/gitlab-ce/script.deb.sh | bash

# workaround for PostgreSQL shmmax issue
echo "kernel.shmmax=17179869184" >> /etc/sysctl.d/90-shmmax.conf
/sbin/sysctl -p /etc/sysctl.d/90-shmmax.conf

# install GitLab Community Edition
apt-get install -y gitlab-ce

# configure domain
sed -i "s|gitlab.example.com|$(hostname -A | tr -d ' ')|g" /etc/gitlab/gitlab.rb
gitlab-ctl reconfigure

Login
http://YOUR_SERVER_IP
user: root
pass: 5iveL!fe

Downloads: GitLab CE Download Archives
https://about.gitlab.com/downloads/archives/

# check instalation
gitlab-rake gitlab:check

# GitLab APT repository
https://packages.gitlab.com/gitlab/gitlab-ce

# rebuild an authorized_keys file
gitlab-rake gitlab:shell:setup

# install specific version
sudo apt-get install -y gitlab-ce=7.10.1~omnibus.1-1

Links
https://packages.gitlab.com/gitlab/gitlab-ce/install
https://packages.gitlab.com/gitlab/gitlab-ce/
https://about.gitlab.com/downloads/
https://gitlab.com/gitlab-org/omnibus-gitlab/blob/master/README.md#installation
https://www.gitlab.com/2014/02/14/gitlab-is-now-simple-to-install/
https://about.gitlab.com/downloads/archives/ - old GitLab packages archive