yumでmysqlをAWSのEC2上にインストール

$ sudo yum install mysql-server
... 省略

AWS用のmy.cnfがあるみたいなのでそれにする

$ sudo mv /usr/share/mysql/my-medium.cnf /etc/my.cnf

やっぱutf-8ですよね。

$ sudo vim /etc/my.cnf
... 省略
character-set-server=utf8

そして起動してみた。けどエラー。。。

$ sudo /etc/rc.d/init.d/mysqld start
MySQL Daemon failed to start.
mysqld を起動中:                                           [失敗]

失敗しか言わない!ので、エラーログみてみます。

$ sudo view /var/log/mysqld.log
... 省略
130707 22:45:53 [ERROR] /usr/libexec/mysqld: Can't find file: './mysql/host.frm' (errno: 13)
130707 22:45:53 [ERROR] Fatal error: Can't open and lock privilege tables: Can't find file: './mysql/host.frm' (errno: 13)

/var/lib/mysqlの権限がroot:rootなのがダメみたい。なんでやねん!!ということでmysql:mysqlに変更

$ sudo chown -R mysql:mysql /var/lib/mysql

再び起動してみる。

$ sudo /etc/ini.d/mysqld start
mysqld を起動中:                                           [  OK  ]

わーい!ヽ(=´▽`=)ノ

パスワード変更など

と、ここで終わると危ないので、rootのパスワードとか変更するためにmysql_secure_installationしますよ。

$ mysql_secure_installation

NOTE: RUNNING ALL PARTS OF THIS SCRIPT IS RECOMMENDED FOR ALL MySQL
      SERVERS IN PRODUCTION USE!  PLEASE READ EACH STEP CAREFULLY!

In order to log into MySQL to secure it, we'll need the current
password for the root user.  If you've just installed MySQL, and
you haven't set the root password yet, the password will be blank,
so you should just press enter here.

Enter current password for root (enter for none):
OK, successfully used password, moving on...

Setting the root password ensures that nobody can log into the MySQL
root user without the proper authorisation.

root パスワード変えるので[y]いれて新しいパスワードを2回入力


Set root password? [Y/n] y
New password:
Re-enter new password:
Password updated successfully!
Reloading privilege tables..
 ... Success!

ルートユーザー以外のデフォルトユーザは削除しますので[y]で。


By default, a MySQL installation has an anonymous user, allowing anyone
to log into MySQL without having to have a user account created for
them.  This is intended only for testing, and to make the installation
go a bit smoother.  You should remove them before moving into a
production environment.

Remove anonymous users? [Y/n] y
 ... Success!

リモートからのルートログインはしませんので[n]で。


Normally, root should only be allowed to connect from 'localhost'.  This
ensures that someone cannot guess at the root password from the network.
	
Disallow root login remotely? [Y/n] n
 ... Success!

テスト用のデータベースもイラナイので削除[y]で。


By default, MySQL comes with a database named 'test' that anyone can
access.  This is also intended only for testing, and should be removed
before moving into a production environment.
	
Remove test database and access to it? [Y/n] y
 - Dropping test database...
 ... Success!
 - Removing privileges on test database...
 ... Success!

いますぐ設定反映させます。[y]で。


Reloading the privilege tables will ensure that all changes made so far
will take effect immediately.
	
Reload privilege tables now? [Y/n] y
 ... Success!
	
Cleaning up...
	
	
	
All done!  If you've completed all of the above steps, your MySQL
installation should now be secure.
	
Thanks for using MySQL!

おつ!!

mysqlコンソール起動してみる

$ mysql -u root -p
Enter password:
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 12
Server version: 5.5.31-log MySQL Community Server (GPL)

Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql>

大丈夫そうです。

一応testテーブル削除されてるかとか確認。

mysql>show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| mysql              |
| performance_schema |
+--------------------+
3 rows in set (0.00 sec)

OK!!!バッチリですね。