2021 CentOS 6.8 install MySQL 5.5

1. Add rpm source

wget dev.mysql.com/get/mysql-community-release-el6-5.noarch.rpm
yum localinstall mysql-community-release-el6-5.noarch.rpm

yum-config-manager --disable mysql57-community
yum-config-manager --disable mysql56-community
yum-config-manager --enable mysql55-community

2. Install the yum command toolkit

yum -y install yum-utils

3. Install Mysql 5.5

Install mysql server

yum install mysql-community-server

Start mysql

service mysqld start

Initialize password

mysql_secure_installation