Hi Stephane,

Ofcourse this is possible! You would first install a V8 on port xxxx and then install a V9 on another port. You will have two Odoo's running on two ports with two different folder locations. I'll write out a little guide. First create a new file to run a V8 installation:

sudo nano odoo-installer.sh

Then place the following code inside:

#!/bin/bash

################################################################################

# Script for installing Odoo V8 on Ubuntu 14.04 LTS (could be used for other version too)

# Author: Yenthe Van Ginneken

#-------------------------------------------------------------------------------

# This script will install Odoo on your Ubuntu 14.04 server. It can install multiple Odoo instances

# in one Ubuntu because of the different xmlrpc_ports

#-------------------------------------------------------------------------------

# Make a new file:

# sudo nano odoo-install.sh

# Place this content in it and then make the file executable:

# sudo chmod +x odoo-install.sh

# Execute the script to install Odoo:

# ./odoo-install

################################################################################

 

##fixed parameters

#odoo

OE_USER="odoo"

OE_HOME="/$OE_USER"

OE_HOME_EXT="/$OE_USER/$OE_USER-server"

#The default port where this Odoo instance will run under (provided you use the command -c in the terminal)

#Set to true if you want to install it, false if you don't need it or have it already installed.

INSTALL_WKHTMLTOPDF="True"



#Choose the Odoo version which you want to install. For example: 8.0, 7.0 or saas-6. When using 'trunk' the master version will be installed.

#IMPORTANT! This script will work fine for any Odoo version except V9. 9.0 needs extra libraries. Please use the script found at

#https://github.com/Yenthe666/InstallScript/tree/master/V9

OE_VERSION="8.0"



#set the superadmin password

OE_SUPERADMIN="admin"

OE_CONFIG="$OE_USER-server"



#--------------------------------------------------

# Update Server

#--------------------------------------------------

echo -e "\n---- Update Server ----"

sudo apt-get update

sudo apt-get upgrade -y



#--------------------------------------------------

# Install PostgreSQL Server

#--------------------------------------------------

echo -e "\n---- Install PostgreSQL Server ----"

sudo apt-get install postgresql -y

	

echo -e "\n---- PostgreSQL $PG_VERSION Settings  ----"

sudo sed -i s/"#listen_addresses = 'localhost'"/"listen_addresses = '*'"/g /etc/postgresql/9.3/main/postgresql.conf



echo -e "\n---- Creating the ODOO PostgreSQL User  ----"

sudo su - postgres -c "createuser -s $OE_USER" 2> /dev/null || true



#--------------------------------------------------

# Install Dependencies

#--------------------------------------------------

echo -e "\n---- Install tool packages ----"

sudo apt-get install wget subversion git bzr bzrtools python-pip -y

	

echo -e "\n---- Install python packages ----"

sudo apt-get install python-dateutil python-feedparser python-ldap python-libxslt1 python-lxml python-mako python-openid python-psycopg2 python-pybabel python-pychart python-pydot python-pyparsing python-reportlab python-simplejson python-tz python-vatnumber python-vobject python-webdav python-werkzeug python-xlwt python-yaml python-zsi python-docutils python-psutil python-mock python-unittest2 python-jinja2 python-pypdf python-decorator python-requests python-passlib python-pil -y

	

echo -e "\n---- Install python libraries ----"

sudo pip install gdata



#--------------------------------------------------

# Install Wkhtmltopdf if needed

#--------------------------------------------------

if [ $INSTALL_WKHTMLTOPDF = "True" ]; then

echo -e "\n---- Install wkhtml and place on correct place for ODOO 8 ----"

sudo wget http://download.gna.org/wkhtmltopdf/0.12/0.12.1/wkhtmltox-0.12.1_linux-trusty-amd64.deb

sudo dpkg -i wkhtmltox-0.12.1_linux-trusty-amd64.deb

sudo cp /usr/local/bin/wkhtmltopdf /usr/bin

sudo cp /usr/local/bin/wkhtmltoimage /usr/bin

else

  echo "Wkhtmltopdf isn't installed due to the choice of the user!"

fi

	

echo -e "\n---- Create ODOO system user ----"

sudo adduser --system --quiet --shell=/bin/bash --home=$OE_HOME --gecos 'ODOO' --group $OE_USER

#The user should also be added to the sudo'ers group.

sudo adduser $OE_USER sudo



echo -e "\n---- Create Log directory ----"

sudo mkdir /var/log/$OE_USER

sudo chown $OE_USER:$OE_USER /var/log/$OE_USER



#--------------------------------------------------

# Install ODOO

#--------------------------------------------------

echo -e "\n==== Installing ODOO Server ===="

sudo git clone --branch $OE_VERSION https://www.github.com/odoo/odoo $OE_HOME_EXT/



echo -e "\n---- Create custom module directory ----"

sudo su $OE_USER -c "mkdir $OE_HOME/custom"

sudo su $OE_USER -c "mkdir $OE_HOME/custom/addons"



echo -e "\n---- Setting permissions on home folder ----"

sudo chown -R $OE_USER:$OE_USER $OE_HOME/*



echo -e "* Create server config file"

sudo cp $OE_HOME_EXT/debian/openerp-server.conf /etc/$OE_CONFIG.conf

sudo chown $OE_USER:$OE_USER /etc/$OE_CONFIG.conf

sudo chmod 640 /etc/$OE_CONFIG.conf



echo -e "* Change server config file"

sudo sed -i s/"db_user = .*"/"db_user = $OE_USER"/g /etc/$OE_CONFIG.conf

sudo sed -i s/"; admin_passwd.*"/"admin_passwd = $OE_SUPERADMIN"/g /etc/$OE_CONFIG.conf

sudo su root -c "echo 'logfile = /var/log/$OE_USER/$OE_CONFIG$1.log' >> /etc/$OE_CONFIG.conf"

sudo su root -c "echo 'addons_path=$OE_HOME_EXT/addons,$OE_HOME/custom/addons' >> /etc/$OE_CONFIG.conf"



echo -e "* Create startup file"

sudo su root -c "echo '#!/bin/sh' >> $OE_HOME_EXT/start.sh"

sudo su root -c "echo 'sudo -u $OE_USER $OE_HOME_EXT/openerp-server --config=/etc/$OE_CONFIG.conf' >> $OE_HOME_EXT/start.sh"

sudo chmod 755 $OE_HOME_EXT/start.sh



#--------------------------------------------------

# Adding ODOO as a deamon (initscript)

#--------------------------------------------------



echo -e "* Create init file"

echo '#!/bin/sh' >> ~/$OE_CONFIG

echo '### BEGIN INIT INFO' >> ~/$OE_CONFIG

echo '# Provides: $OE_CONFIG' >> ~/$OE_CONFIG

echo '# Required-Start: $remote_fs $syslog' >> ~/$OE_CONFIG

echo '# Required-Stop: $remote_fs $syslog' >> ~/$OE_CONFIG

echo '# Should-Start: $network' >> ~/$OE_CONFIG

echo '# Should-Stop: $network' >> ~/$OE_CONFIG

echo '# Default-Start: 2 3 4 5' >> ~/$OE_CONFIG

echo '# Default-Stop: 0 1 6' >> ~/$OE_CONFIG

echo '# Short-Description: Enterprise Business Applications' >> ~/$OE_CONFIG

echo '# Description: ODOO Business Applications' >> ~/$OE_CONFIG

echo '### END INIT INFO' >> ~/$OE_CONFIG

echo 'PATH=/bin:/sbin:/usr/bin' >> ~/$OE_CONFIG

echo "DAEMON=$OE_HOME_EXT/openerp-server" >> ~/$OE_CONFIG

echo "NAME=$OE_CONFIG" >> ~/$OE_CONFIG

echo "DESC=$OE_CONFIG" >> ~/$OE_CONFIG

echo '' >> ~/$OE_CONFIG

echo '# Specify the user name (Default: odoo).' >> ~/$OE_CONFIG

echo "USER=$OE_USER" >> ~/$OE_CONFIG

echo '' >> ~/$OE_CONFIG

echo '# Specify an alternate config file (Default: /etc/openerp-server.conf).' >> ~/$OE_CONFIG

echo "CONFIGFILE=\"/etc/$OE_CONFIG.conf\"" >> ~/$OE_CONFIG

echo '' >> ~/$OE_CONFIG

echo '# pidfile' >> ~/$OE_CONFIG

echo 'PIDFILE=/var/run/$NAME.pid' >> ~/$OE_CONFIG

echo '' >> ~/$OE_CONFIG

echo '# Additional options that are passed to the Daemon.' >> ~/$OE_CONFIG

echo 'DAEMON_OPTS="-c $CONFIGFILE"' >> ~/$OE_CONFIG

echo '[ -x $DAEMON ] || exit 0' >> ~/$OE_CONFIG

echo '[ -f $CONFIGFILE ] || exit 0' >> ~/$OE_CONFIG

echo 'checkpid() {' >> ~/$OE_CONFIG

echo '[ -f $PIDFILE ] || return 1' >> ~/$OE_CONFIG

echo 'pid=`cat $PIDFILE`' >> ~/$OE_CONFIG

echo '[ -d /proc/$pid ] && return 0' >> ~/$OE_CONFIG

echo 'return 1' >> ~/$OE_CONFIG

echo '}' >> ~/$OE_CONFIG

echo '' >> ~/$OE_CONFIG

echo 'case "${1}" in' >> ~/$OE_CONFIG

echo 'start)' >> ~/$OE_CONFIG

echo 'echo -n "Starting ${DESC}: "' >> ~/$OE_CONFIG

echo 'start-stop-daemon --start --quiet --pidfile ${PIDFILE} \' >> ~/$OE_CONFIG

echo '--chuid ${USER} --background --make-pidfile \' >> ~/$OE_CONFIG

echo '--exec ${DAEMON} -- ${DAEMON_OPTS}' >> ~/$OE_CONFIG

echo 'echo "${NAME}."' >> ~/$OE_CONFIG

echo ';;' >> ~/$OE_CONFIG

echo 'stop)' >> ~/$OE_CONFIG

echo 'echo -n "Stopping ${DESC}: "' >> ~/$OE_CONFIG

echo 'start-stop-daemon --stop --quiet --pidfile ${PIDFILE} \' >> ~/$OE_CONFIG

echo '--oknodo' >> ~/$OE_CONFIG

echo 'echo "${NAME}."' >> ~/$OE_CONFIG

echo ';;' >> ~/$OE_CONFIG

echo '' >> ~/$OE_CONFIG

echo 'restart|force-reload)' >> ~/$OE_CONFIG

echo 'echo -n "Restarting ${DESC}: "' >> ~/$OE_CONFIG

echo 'start-stop-daemon --stop --quiet --pidfile ${PIDFILE} \' >> ~/$OE_CONFIG

echo '--oknodo' >> ~/$OE_CONFIG

echo 'sleep 1' >> ~/$OE_CONFIG

echo 'start-stop-daemon --start --quiet --pidfile ${PIDFILE} \' >> ~/$OE_CONFIG

echo '--chuid ${USER} --background --make-pidfile \' >> ~/$OE_CONFIG

echo '--exec ${DAEMON} -- ${DAEMON_OPTS}' >> ~/$OE_CONFIG

echo 'echo "${NAME}."' >> ~/$OE_CONFIG

echo ';;' >> ~/$OE_CONFIG

echo '*)' >> ~/$OE_CONFIG

echo 'N=/etc/init.d/${NAME}' >> ~/$OE_CONFIG

echo 'echo "Usage: ${NAME} {start|stop|restart|force-reload}" >&2' >> ~/$OE_CONFIG

echo 'exit 1' >> ~/$OE_CONFIG

echo ';;' >> ~/$OE_CONFIG

echo '' >> ~/$OE_CONFIG

echo 'esac' >> ~/$OE_CONFIG

echo 'exit 0' >> ~/$OE_CONFIG



echo -e "* Security Init File"

sudo mv ~/$OE_CONFIG /etc/init.d/$OE_CONFIG

sudo chmod 755 /etc/init.d/$OE_CONFIG

sudo chown root: /etc/init.d/$OE_CONFIG



echo -e "* Change default xmlrpc port"

sudo su root -c "echo 'xmlrpc_port = $OE_PORT' >> /etc/$OE_CONFIG.conf"



echo -e "* Start ODOO on Startup"

sudo update-rc.d $OE_CONFIG defaults



echo -e "* Starting Odoo Service"

sudo su root -c "/etc/init.d/$OE_CONFIG start"

echo "-----------------------------------------------------------"

echo "Done! The Odoo server is up and running. Specifications:"

echo "Port: $OE_PORT"

echo "User service: $OE_USER"

echo "User PostgreSQL: $OE_USER"

echo "Code location: $OE_USER"

echo "Addons folder: $OE_USER/$OE_CONFIG/addons/"

echo "Start Odoo service: sudo service $OE_CONFIG start"

echo "Stop Odoo service: sudo service $OE_CONFIG stop"

echo "Restart Odoo service: sudo service $OE_CONFIG restart"

echo "-----------------------------------------------------------"

Now make that file executable:

sudo chmod +x odoo-installer.sh

and execute it:

./odoo-installer.sh

Now repeat this proces for V9 with my V9 installation script from Github. Just change the default xmlrpc-port to 8070 for example and then start your V9 installation.

Yenthe