Hi aro odoo,

Please follow below steps as 'root' user,.
Hope this will work for you.

Step 1 — Add Odoo user to the system
sudo adduser --system --shell=/bin/bash --home-dir=/opt/odoo -m odoo

Step 2 — Make Configuration Directory and Log Directory
sudo mkdir /etc/odoo && mkdir /var/log/odoo/

Step 3 — Installing Necessary OS Packages
sudo yum install https://centos7.iuscommunity.org/ius-release.rpm -y && sudo yum update -y && yum upgrade -y && sudo yum groupinstall 'Development Tools' -y && sudo yum install python36u python36u-devel python36-pillow python36-lxml npm nodejs libxml2-devel libjpeg-devel libxml2 libxslt libxslt-devel wget libpng libjpeg openssl icu libX11 libXext libXrender xorg-x11-fonts-Type1 xorg-x11-fonts-75dpi python3-pip python3-setuptools git openldap-devel -y

Step 4 — Installing Node Packages
sudo npm install -g less less-plugin-clean-css -y

Step 5 — PostgreSQL Installation
rpm -Uvh https://yum.postgresql.org/10/redhat/rhel-7-x86_64/pgdg-centos10-10-2.noarch.rpm && yum install postgresql10-server postgresql10 -y && /usr/pgsql-10/bin/postgresql-10-setup initdb && systemctl start postgresql-10.service && systemctl enable postgresql-10.service

Step 6 — Creating PostgreSQL user for Odoo
sudo su - postgres -c "createuser -s odoo"

Step 7 — Installing wkhtmltopdf
cd /tmp && wget https://github.com/wkhtmltopdf/wkhtmltopdf/releases/download/0.12.5/wkhtmltox-0.12.5-1.centos7.x86_64.rpm && rpm -Uvh wkhtmltox-0.12.5-1.centos7.x86_64.rpm && sudo ln -s /usr/local/bin/wkhtmltopdf /usr/bin/ && sudo ln -s /usr/local/bin/wkhtmltoimage /usr/bin/

Step 8 — Cloning Odoo 14 From Source Repository
git clone --depth=1 --branch=14.0 https://github.com/odoo/odoo.git /opt/odoo/odoo

Step 9 — Change Ownership of Odoo Directory
sudo chown odoo:odoo /opt/odoo/ -R && sudo chown odoo:odoo /var/log/odoo/ -R

Step 10 — Installing Python Packages Required by Odoo
cd /opt/odoo/odoo && sudo pip3 install -r requirements.txt

Step 11 — Starting Odoo and Creating Config File
sudo su - odoo -c "/opt/odoo/odoo/odoo-bin --addons-path=/opt/odoo/odoo/addons -s --stop-after-init"

Step 12 — Moving Config File To Config Directory and Modify Config Params
sudo mv /opt/odoo/.odoorc /etc/odoo/odoo.conf
sudo sed -i "s,^\(logfile = \).*,\1"/var/log/odoo/odoo-server.log"," /etc/odoo/odoo.conf
sudo sed -i "s,^\(logrotate = \).*,\1"True"," /etc/odoo/odoo.conf
sudo sed -i "s,^\(proxy_mode = \).*,\1"True"," /etc/odoo/odoo.conf
sudo ln -s /opt/odoo/odoo/odoo-bin /usr/bin/odoo

Step 13 — Setting Up Odoo To Start at OS StartUp
sudo cp /opt/odoo/odoo/debian/odoo.service /etc/systemd/system/odoo.service && chmod +x /etc/systemd/system/odoo.service && sudo systemctl daemon-reload && sudo systemctl start odoo && sudo systemctl enable odoo && chkconfig --levels 2345 odoo on

Thanks & Regards,
Email: odoo@aktivsoftware.com
Skype: kalpeshmaheshwari