Linux下mysql的安装

在centos上安装Mysql5.5.31的安装过程，
安装之前请删除已经安装的mysql，方法请看http://zhenjw.iteye.com/admin/blogs/1897885

在mysql官网下的是server和client的安装文件
MySQL-server-5.5.31-2.linux2.6.x86_64.rpm
MySQL-client-5.5.31-2.linux2.6.x86_64.rpm

linux下的安装命令

rpm -ivh MySQL-server-5.5.31-2.linux2.6.x86_64.rpm MySQL-client-5.5.31-2.linux2.6.x86_64.rpm


提示安装完成后，输入mysql 看是否安装成功

mysql

[root@localhost mysql]# mysql
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2)

[root@localhost mysql]# service mysql start
Starting MySQL.. SUCCESS!
[root@localhost mysql]#

[root@localhost mysql]# mysql
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 1
Server version: 5.5.31 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>

首次安装时，默认密码为空，可以使用如下命令修改root密码，
[root@localhost mysql]# mysqladmin -u root password 123456
[root@localhost mysql]# mysql -u root -p



rpm包安装的MySQL是不会安装/etc/my.cnf文件的，解决方法，只需要复制/usr/share/mysql目录下的my-huge.cnf 文件到/etc目录，并改名为my.cnf即可

cp /usr/share/mysql/my-huge.cnf /etc/my.cnf



配置远程访问

处于安全考虑，Mysql默认是不允许远程访问的，可以使用下面开启远程访问

//赋予任何主机访问数据的权限
mysql>GRANT ALL PRIVILEGES ON *.* TO 'root'@'%'WITH GRANT OPTION;

//使修改生效
mysql>FLUSH PRIVILEGES;

如果依然不能远程访问的话，那就很可能防火墙的原因了，可以在防火墙中开启3306端口或者干脆关掉防火墙。