一、卸载MySQL

关闭目前的mysql服务

#/etc/init.d/mysqld stop

确保已正常关闭

#ps -ef | grep mysql

查询mysql的安装情况:

#rpm -qa | grep mysql

将列出来的删除。

#rpm -e mysql-server.x86_64

这里有些朋友可能会出错,形如:

[root@centos-dev halc]# rpm -e mysql-libs-5.1.69-1.el6_4.i686
error: Failed dependencies:
    libmysqlclient.so.16 is needed by (installed) postfix-2:2.6.6-2.2.el6_1.i686
    libmysqlclient.so.16(libmysqlclient_16) is needed by (installed) postfix-2:2.6.6-2.2.el6_1.i686
    mysql-libs is needed by (installed) postfix-2:2.6.6-2.2.el6_1.i686

用这个就好了

#rpm -e --nodeps mysql-libs-5.1.69-1.el6_4.i686

二、安装MariaDB的方法

1.创建/etc/yum.repos.d/MariaDB.repo文件

vim /etc/yum.repos.d/MariaDB.repo

#centos 6.9复制下列代码
[mariadb]
name = MariaDB
baseurl = http://mirrors.ustc.edu.cn/mariadb/yum/5.5/centos6-amd64
gpgkey=http://mirrors.ustc.edu.cn/mariadb/yum/RPM-GPG-KEY-MariaDB
gpgcheck=1

2.准备好repo文件后可以使用yum来安装了

# yum install MariaDB-server MariaDB-client

3.自定义数据目录和服务端口,所以移除默认的数据目录(不需要自定义的请直接执行第8步

# rm -rf /var/lib/mysql

4.创建新的数据目录

# mkdir /var/data/db/mariadb

5.修改配置文件/etc/my.cnf.d/mysql-clients.cnf,重点是[client],其他的可以参考

[client]
port        = 3307
socket      = /var/data/db/mariadb/mysql.sock

[mysql]
no-auto-rehash

[mysqldump]
quick
max_allowed_packet = 64M

[myisamchk]
key_buffer_size = 128M
sort_buffer_size = 128M
read_buffer = 2M
write_buffer = 2M

[mysqlhotcopy]
interactive-timeout

6.修改配置文件/etc/my.cnf.d/server.cnf,这里的性能参数来自my-large.ini文件

[mysqld]
port            = 3307
datadir         = /var/data/db/mariadb
socket          = /var/data/db/mariadb/mysql.sock
skip-external-locking
key_buffer_size = 256M
max_allowed_packet = 64M
table_open_cache = 256
sort_buffer_size = 1M
read_buffer_size = 1M
read_rnd_buffer_size = 4M
myisam_sort_buffer_size = 64M
thread_cache_size = 8
query_cache_size= 16M
thread_concurrency = 8
log-bin=mysql-bin
binlog_format=mixed
server-id   = 1

7.初始化数据

# mysql_install_db --defaults-file=/etc/my.cnf --datadir=/var/data/db/mariadb/ --user=mysql

8.启动服务

# service mysql start

9.设置ROOT密码

# mysqladmin -u root password "8888888"

10.登陆mysql

# mysql -uroot -p

11.授权root远程登录

#root可从任何IP登陆,注意修改密码:'888888' 
mysql>GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' IDENTIFIED BY '888888' WITH GRANT OPTION;

#root可从指定IP登陆,注意修改密码:'888888'、IP:'192.168.1.188'
mysql>GRANT ALL PRIVILEGES ON *.* TO 'root'@'192.168.1.188' IDENTIFIED BY '888888' WITH GRANT OPTION;
mysql>FLUSH PRIVILEGES;
最后修改:2018 年 05 月 04 日 01 : 46 PM
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