Gluster on Debian

Remote all installation and config of gluster
apt-get purge --auto-remove glusterfs-server

Install gluster on servers, (server1, server2)
apt-get install glusterfs-server

On server1
gluster peer probe server2

On server2
gluster peer probe server1

On server1
gluster volume create gv0 replica 2 server1:/path/to/folderserver1 server2:/path/to/folderserver2

gluster volume start gv0 

On server2
mount -t glusterfs server2:/gv0 /path/to/sharedir 

sharedir is represent for broadcast to 2 folderserver1 and folderserver2, data store in sharedir is replicated to folderserver1 and folderserver2

Install Gitlab on Debian 7

Install Gitlab

sudo apt-get install curl
curl -sS https://packages.gitlab.com/install/repositories/gitlab/gitlab-ce/script.deb.sh | sudo bash
sudo apt-get install gitlab-ce
sudo gitlab-ctl reconfigure

Open file /etc/gitlab/gitlab.rb
sudo nano /etc/gitlab/gitlab.rb

Change lines

external_url 'http://yougitdomain.com'

gitlab_rails['gitlab_email_from'] = 'notification@yourdomain.com'
gitlab_rails['gitlab_email_display_name'] = 'Notification'
gitlab_rails['gitlab_email_reply_to'] = 'notification@yourdomain.com'

gitlab_rails['smtp_enable'] = true
gitlab_rails['smtp_address'] = "smtp.gmail.com"
gitlab_rails['smtp_port'] = 587
gitlab_rails['smtp_user_name'] = "yourgmail@gmail.com"
gitlab_rails['smtp_password'] = "yourpassword"
gitlab_rails['smtp_domain'] = "smtp.gmail.com"
gitlab_rails['smtp_authentication'] = "login"
gitlab_rails['smtp_enable_starttls_auto'] = true
gitlab_rails['smtp_tls'] = false
gitlab_rails['smtp_openssl_verify_mode'] = 'peer'
gitlab_rails['smtp_ca_path'] = "/etc/ssl/certs"
gitlab_rails['smtp_ca_file'] = "/etc/ssl/certs/ca-certificates.crt"

nginx['listen_port'] = 5555 #replace by your port

Reconfig Gitlab
sudo gitlab-ctl reconfigure

Gitlab will run on port 5555 (as above config)

Troubleshoot: when restart OS, maybe Gitlab cannot start, you will install systemd to auto boot Gitlab

sudo apt-get install systemd

Install Haproxy from source on Debian 7

apt-get install build-essential make g++ libssl-dev

tar xvf haproxy-1.6.5.tar.gz

cd haproxy-1.6.5

make TARGET=linux2628  USE_OPENSSL=yes USE_ZLIB=yes

make install

cp /usr/local/sbin/haproxy /usr/sbin/
cp examples/haproxy.init /etc/init.d/haproxy
chmod 755 /etc/init.d/haproxy
mkdir -p /etc/haproxy
mkdir -p /run/haproxy
mkdir -p /var/lib/haproxy
touch /var/lib/haproxy/stats
useradd -r haproxy