Linux

MBR Backup

[root@testsvr01~]#  dd if=/dev/sda1 of=/opt/mbr_backup bs=512 count=1

0+1 records in
0+1 records out
115 bytes (115 B) copied, 0.0001912 s, 601 kB/s

[root@testsvr01~]#

[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

[root@testsvr01~]# df -Th | grep "^/dev"
/dev/mapper/rhel-root xfs        50G  8.8G   42G  18% /
/dev/vda1             xfs       497M  199M  299M  40% /boot
/dev/mapper/rhel-home xfs        46G  8.9G   37G  20% /home
[root@testsvr01~]#

[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

[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

• Check Available Disk

[root@testsvr01~]# lsblk
NAME          MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
sda             8:0    0   60G  0 disk
├─sda1          8:1    0    1G  0 part /boot
└─sda2          8:2    0   59G  0 part
  ├─rhel-root 253:0    0 35.6G  0 lvm  /
  ├─rhel-swap 253:1    0    6G  0 lvm  [SWAP]
  └─rhel-home 253:2    0 17.4G  0 lvm  /home
sdb             8:16   0  250G  0 disk
sdc             8:32   0  250G  0 disk

• List available Nginx Version

[root@testsvr01 ~]# yum module list nginx

• 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

• List available PHP Version

[root@testsvr01 ~]# yum module list php