cd /var
mkdir repo && cd repo
mkdir site.git && cd site.git
git init --bare
cd hooks
vi post-receive
create post-receive file with below script
#!/bin/sh
git --work-tree=/var/www/domain.com --git-dir=/var/repo/site.git checkout -f
chmod +x post-receive
chown username ppit-services-helpdesk.git
ssh://user@192.168.100.1/var/repo/pp-helpdesk.git