cpu-ksar

How to Install Nagios 4.3.4 on RHEL / CentOS

Nagios is an awesome Open Source monitoring tool, its provides you more comprehensive monitoring environment to always keep an eye on your all machines / networks whether you are in a your data center or just your small labs. With Nagios, you can monitor your remote hosts and their services remotely on a single window. […]

MySQL Master-Master Replication Bug – ERROR 1872

Description: When i tried to configurate a crash safe slave with MTS and GTID based replication, but after a OS crash replication failed to be start. error log: ——————————— 2016-10-26 21:00:23 2699 [Warning] Neither –relay-log nor –relay-log-index were used; so replication may break when this MySQL server acts as a slave and has his hostname […]

Password Validation Plugin in MySQL

The validate_password plugin serves to test passwords and improve security. The plugin exposes a set of system variables that enable you to define password policy. First check the plugin directory of MySQL. mysql> show variables like “plugin%”; +—————+————————–+ | Variable_name | Value | +—————+————————–+ | plugin_dir | /usr/lib64/mysql/plugin/ | +—————+————————–+ 1 row in set (0.00 […]