Check if your server meets the hardware requirements. GitLab packages are built for 64bit systems. For 32bit OS, consider alternative installation methods.

1. Install and configure the necessary dependencies

If you install Postfix to send email please select 'Internet Site' during setup. Instead of using Postfix you can also use Sendmail or configure a custom SMTP server. If you wish to use Exim, please configure it as an SMTP server.

On Centos 6 and 7, the commands below will also open HTTP and SSH access in the system firewall.

sudo yum install curl openssh-server postfix cronie
sudo service postfix start
sudo chkconfig postfix on
sudo lokkit -s http -s ssh

2. Add the GitLab package server and install the package

curl https://packages.gitlab.com/install/repositories/gitlab/gitlab-ce/script.rpm.sh | sudo bash
sudo yum install gitlab-ce

If you are not comfortable installing the repository through a piped script, you can find the  entire script here.

Alternatively you can  select and download the package manually and install using

rpm -i gitlab-ce-XXX.rpm

3. Configure and start GitLab

sudo gitlab-ctl reconfigure

4. Browse to the hostname and login

Username: root 
Password: 5iveL!fe

 For configuration and troubleshooting options please see the Omnibus GitLab documentation

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