[root@testsvr01~]# rpm -q kernel
kernel-3.10.0-1160.15.2.el7.x86_64
kernel-3.10.0-1160.21.1.el7.x86_64
kernel-3.10.0-1160.24.1.el7.x86_64
kernel-3.10.0-1160.36.2.el7.x86_64
kernel-3.10.0-1160.71.1.el7.x86_64
[root@ehapp01 ~]# package-cleanup --oldkernels --count=1
Loaded plugins: fastestmirror, langpacks
--> Running transaction check
---> Package kernel.x86_64 0:3.10.0-1160.15.2.el7 will be erased
---> Package kernel.x86_64 0:3.10.0-1160.21.1.el7 will be erased

This step should have been completed upon the installation of PostgreSQL, but if you haven’t, you can complete it with:

Install Repository

yum -y install https://download.postgresql.org/pub/repos/yum/12/redhat/rhel-7-x86_64/pgdg-redhat-repo-latest.noarch.rpm

Now you are ready to install pgAdmin with:

Install Dependencies

[root@testsvr01~]# yum-config-manager   --add-repo   https://download.docker.com/linux/centos/docker-ce.repo
[root@testsvr01~]# yum install docker-ce
Retrieving key from https://download.docker.com/linux/centos/gpg
Importing GPG key 0x621E9F35:
 Userid     : "Docker Release (CE rpm) <docker@docker.com>"
 Fingerprint: 060a 61c9 1b55 8a7f 742b 77aa c52f eb6b 621e 9f35
 From       : https://download.docker.com/linux/centos/gpg
Is this ok [y/N]: y
Running transaction check
Running transaction test

• Install Remi Repository

[root@testsvr01 ~]# yum install http://rpms.remirepo.net/enterprise/remi-release-7.rpm

[root@testsvr01 ~]# yum -y install yum-utils

• Enable PHP 8.1 Repo

root@testsvr01 ~]# yum-config-manager --enable remi-php81

• Install PHP 

[root@testsvr01 ~]# yum install php -y

• Create New flaskapp.service File Under /etc/systemd/system/ Directory

[root@pythonsvr01 ~]# vi /etc/systemd/system/flaskapp.service
[Unit]
Description=Flask Python Application Container
After=network.target

[Service]
Type=idle

Environment=CONFIGURATION_SETUP=config.ProductionConfig
Environment=FLASK_ENV=production

ExecStart=/bin/bash -c '/usr/bin/python3.6 /opt/flaskapp/app.py'
ExecStop=/bin/kill -15 $MAINPID

This step should have been completed upon the installation of Drupal 8 for getting PHPMailer function

Install Composer

# curl -sS https://getcomposer.org/installer | php

Move Composer binary to usr bin path

# mv composer.phar /usr/bin/composer

Check Composer Version

# composer --version

Go to Drupal root Directory and execute

Drupal Installation Directory - /var/www/html

This step should have been completed upon the installation of MySQL 5.7, but if you haven’t, you can complete it with:

System Updates

yum update

Install Repository

yum -y install yum localinstall https://dev.mysql.com/get/mysql57-community-release-el7-9.noarch.rpm

Now you are ready to install MySQL 5.7 with:

yum -y install mysql-community-server

Firewall Configuration

[root@testdbsvr01~]# dnf install -y https://download.postgresql.org/pub/repos/yum/reporpms/EL-8-x86_64/pgdg-redhat-repo-latest.noarch.rpm
[root@testdbsvr01~]# dnf -qy module disable postgresql

[root@testdbsvr01~]# dnf install -y postgresql12-server

[root@testdbsvr01~]# dnf install -y postgresql12-contrib

[root@testdbsvr01~]# /usr/pgsql-12/bin/postgresql-12-setup initdb
Initializing database ... OK

• List available Nginx Version

[root@testsvr01 ~]# yum module list nginx

• Check Disk IOPS using dd command in Linux

[root@testsvr01~]# dd if=/dev/zero of=/tmp/temp.img bs=2G count=1 oflag=dsync status=progress
2147479552 bytes (2.1 GB) copied, 3.478083 s, 617 MB/s
0+1 records in
0+1 records out
2147479552 bytes (2.1 GB) copied, 3.4785 s, 617 MB/s
[root@testsvr01~]#