How to Install Odoo 15 on CentOS 8 / AlmaLinux 8 Print

This article will show you how to install Odoo 15 on CentOS 8 / AlmaLinux 8

Prerequisites

• Operating system: CentOS 8 or AlmaLinux 8
• Access: Ability to connect to the server via SSH.
• Permissions: a user with root privileges (i.e. able to use the 'sudo' command).

Note: Although you can execute all the commands below from the root user, it is highly recommended that you use a separate user with 'sudo' privileges.

Step 1: Log in to AlmaLinux 8 server via SSH as the root user:

ssh root@IP_Address -p Port_number

Replace ‘IP_Address’ and ‘Port_number’ with your server’s respective IP address and SSH port number. 

Step 2: Update the System

Once you’re connected to your server, update the list of available packages using the following command.

sudo dnf update -y

Step 3: Install Python and other dependencies

Now, you need to install Python and other required dependencies on your server. 

sudo dnf install python3 python3-devel git gcc git redhat-rpm-config libxslt-devel bzip2-devel openldap-devel libjpeg-devel freetype-devel -y

Step 4: Install wkhtmltopdf package

Wkhtmltopdf is the package that allows Odoo 15 to print PDF reports. It converts HTML (web page markup) to PDF, but it's not present in the official package list nor the EPEL repository. 

sudo dnf install https://github.com/wkhtmltopdf/wkhtmltopdf/releases/download/0.12.5/wkhtmltox-0.12.5-1.centos8.x86_64.rpm

Once all the packages are installed, It is high time for PostgreSQL and Odoo installation. Steps for its installation are given below.

Next, you will need to install the PostgreSQL package on your server. 

Step 5: Create a Dedicated Linux User for Odoo

You need to create a dedicated Linux user in order to keep Odoo's permissions strict and pre-defined. 

The following command will create a user named odoo and a user group of the same name. The home directory for the user will be /opt/odoo, and Bash will be the default shell. 

sudo useradd -m -U -r -d /opt/odoo -s /bin/bash odoo

Note: you can choose any name for the user, but make sure to use that same name in the next step, when you will be creating a database user.

Step 6: Install PostgreSQL

You can install PostgreSQL with the following command:

sudo dnf install @postgresql:12 –y

Step 7: Initialize PostgreSQL database

sudo /usr/bin/postgresql-setup initdb

Step 8: Start the PostgreSQL process and make sure the database process is always running

sudo systemctl start postgresql
sudo systemctl enable postgresql

Step 9: Create a new PostgreSQL user (remember to use the user name from the previous step)

Now the user will have the right place to create a new PostgreSQL user set up for Odoo with the following command:

sudo su - postgres -c "createuser -s odoo"

Step 10: Odoo Installation

Secondly for Odoo installation, log in to the Odoo user and download the Odoo 15.

sudo su - odoo
git clone https://www.github.com/odoo/odoo --depth 1 --branch 15.0 /opt/odoo/odoo15
cd /opt/odoo

Step 11: Set new Python virtual environment and its activation

The virtual environment is needed to separate Odoo's Python modules from the system's Python modules so that the two don’t interfere with each other.

python3 -m venv odoo15-venv

source odoo15-venv/bin/activate

Step 12: Install required dependencies

Install required dependencies or Python module

pip3 install -r odoo15/requirements.txt

Step 13: Deactivate dependencies

Deactivate the virtual environment and return to the previous system user (you won't need to do anything under the odoo user anymore)

deactivate

Step 14: Prepare for Custom Odoo Addons

Create a separate directory for custom Odoo addons and change its owner to the odoo user

sudo mkdir /opt/odoo/odoo15-custom-addons
sudo mkdir /var/log/odoo15 && touch /var/log/odoo15/odoo.log
exit

Step 15: Create a Configuration File for Your Odoo Instance

Now, the time comes to configure the Odoo by using various commands:

sudo nano /etc/odoo15.conf

Add the following lines:

[options]
admin_passwd = odoo_master_password
db_host = False
db_port = False
db_user = odoo
db_password = False
xmlrpc_port = 8069
logfile = /var/log/odoo15/odoo.log
logrotate = True
addons_path = /opt/odoo/odoo15/addons,/opt/odoo/odoo15-custom-addons

Close the after the configuration of the Odoo, but don’t forget to save it.

Step 16: Create a System Service File for Odoo

A system service file for Odoo can be obtained with the following command:

sudo nano /etc/systemd/system/odoo.service

Add the following lines:

[Unit]
Description=Odoo15
#Requires=postgresql-10.6.service
#After=network.target postgresql-10.6.service
 
[Service]
Type=simple
SyslogIdentifier=odoo15
PermissionsStartOnly=true
User=odoo
Group=odoo
ExecStart=/opt/odoo/odoo15-venv/bin/python3 /opt/odoo/odoo15/odoo-bin -c /etc/odoo.conf
StandardOutput=journal+console
 
[Install]
WantedBy=multi-user.target

Save and close the file then reload the systemd daemon to apply the changes:

sudo systemctl daemon-reload

Next, start the Odoo service and enable it to start at system reboot:

sudo systemctl start odoo
sudo systemctl enable odoo

Now verify the status of the Odoo service with the following command:

sudo systemctl status odoo

You should get the following output:

odoo.service - Odoo15
   Loaded: loaded (/etc/systemd/system/odoo.service; disabled; vendor preset: disabled)
   Active: active (running) since Sun 2021-06-06 09:41:58 EDT; 4s ago
 Main PID: 23729 (python3)
    Tasks: 4 (limit: 25014)
   Memory: 55.6M
   CGroup: /system.slice/odoo.service
           └─23729 /opt/odoo/odoo15-venv/bin/python3 /opt/odoo/odoo15/odoo-bin -c /etc/odoo.conf
Nov 25 21:41:58 AlmaLinux systemd[1]: Started Odoo15.

At this point, Odoo is started and listening on port 8069. You can check it with the following command:

ss -antpl | grep 8069  

You should get the following output:

LISTEN    0         128                0.0.0.0:8069             
0.0.0.0:*        users:(("python3",pid=23729,fd=4)) 

Step 17: Configure Firewall

The firewall will allow you to port 8069. But here, you can also use the following command:

sudo firewall-cmd --permanent --zone=public --add-port=8069/tcp

Now just apply the changes:

sudo firewall-cmd --reload

Step 18: Access Odoo Web UI

Insert your Odoo master password, database, admin username, password, email, and click on the Create Database button. You should see the Odoo dashboard on the following page:

Congratulations! You have successfully installed Odoo 15 on AlmaLinux 8.