Change hostname and static IP on Centos 7

Change hostname

  • Edit file: /etc/sysconfig/network
  • Add the servername in /etc/hosts file
  • Run hostname command
    sudo hostname
  • Restart network service
    sudo /etc/init.d/network restart
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PHP extensions

Useful extensions:

php-xml php-gd php-curl php-mcrypt php-mbstring php-gettext

For mysql: php-mysql
For Apache2: libapache2-mod-php

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Remove old kernels on Linux

Display current kernel

  $ uname -r
  $ uname -mrs

On ubuntu

  • List all installed kernels
    $ dpkg --list | grep linux-image
  • Remove old kernels
    $ sudo apt-get autoremove
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Linux System Monitor Commands

Checking service/process

if ps ax | grep -v grep | grep $SERVICE > /dev/null; then echo -n "\"$SERVICE\" : \"running\","; else echo -n "\"$SERVICE\" : \"not running\","; fi
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