June 13, 2013 I want to send an email to the host in the back segment (for example, the one that doesn't have an EIP in the VPC, or the one you want to smell in the back, such as a DB or NAS) to name resolution, email, yum, wget, time synchronization, etc.! I will give a rough summary of the settings in this case. For the time being, there are two patterns. NAT (using NAT instances for AWS) pattern and 、...
May 29, 2013 
4 min readHello. This time, I will mainly talk about mysql database recovery (in this blog). The person in charge said, "It seems that myisam is faster than innodb in waordpress, so I tried to benchmark it by tinkering with the parameters of innodb's my.cnf before changing it." ...
May 7, 2013 6 min read**Performance verification when setting up raid0 with Amazon EBS** I want to verify whether or not EBS is fast It seems that there is a theory that this is quite the case if it is multi or large in the test. We will also consider how to migrate to the existing one (starting from separating directories such as binary logs. Official User Guide (EBSPerformance) EBS itself is redundant, so it seems that raid0 is fine. ...
April 26, 2013 **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. ...
April 23, 2013 **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. ...
