
It's been a long time since I've updated. This is Miyashita of the platform. I made a presentation in one of the events called July Tech Festa 2013 held the other day. I will upload the materials I used at that time, so if you are interested, please read it. \[slideshare id=24320385&doc=mysqlha-130716215401-phpapp02\]...

**MHA operation confirmation and switchover verification** This is the continuation of the previous article. Test to switch as shown in the following diagram. *This verification consists of 1 master, 2 slaves, and 1 manager. (Multi-stage configuration is avoided because it will be obscene to restore in the event of an intermediate node failure) If you put the manager in the slave, it seems that there is a possibility that it will not switch well if you put purge\_relay\_logs on it. ...

**Introduction Settings of MHA (MasterHigh AvailabilityManager)** Versions used: mha4mysql-manager-0.53-0, MySQL-5.5 (1) Explanation of simple advantages and other benefits MHA is a product that uses the latest slave as the master in the event of a master failure in mysql to compensate for the differences of other slaves and change the direction of the master. ...