How to Start-Stop MySQL Server on CentOS Server

This small post is to explain how you can start/stop/restart MySQL server from command line on CentOS Server.
Stop MySQL Server

# /etc/init.d/mysqld stop
Start MySQL Server

# /etc/init.d/mysqld start
Restart MySQL Server

# /etc/init.d/mysqld restart
Hope you find this small tip useful


Restore MySQL Database from FileSystem Backup

Always backup your  MySQL database with mysqldump but if you didn’t you can restore it from file system.

If your backup include the /var/lib/mysql directory, if so then you should be able to restore the database. Each database is contained in a separate subdirectory off /var/lib/mysql, so look for one named with the name of your database (WordPress or any other). To restore it, shutdown the mysql server first

sudo /etc/init.d/mysql stop

Copy the backup-ed directory into the same location on your new server, then restart mysql server

sudo /etc/init.d/mysql start

Note:- that its much better to take actual database dumps using the mysqldump command than to rely on this method. so for the future, you should schedule something like this:

mysqldump -h host -u user -ppassword --databases database1 database2 > myfile.dump

 


How can I downgrade my version of PHP ?

Iphp 5.3 on Fedora 17 or Redhat using atomic repo.

You will need to remove php and httpd first (not compulsory)

yum remove php
yum remove httpd

Add the following at the end of /etc/yum.conf(if required)

exclude=php*5.4*

Install php from atomic repo

wget -q -O - http://www.atomicorp.com/installers/atomic | sh
yum install php

More details at 
http://www6.atomicorp.com/channels/atomic/fedora/17/x86_64/RPMS/