mysql 安装以及卸载 CentOS 6.9

mysql官网下载地址：https://dev.mysql.com/downloads/mysql/

本次操作系统是    阿里云服务器 CentOS 6.9 64位

下载得到tar 包： mysql-5.7.21-1.el6.x86_64.rpm-bundle.tar

该连接是我安装mysql时的参照文章：：：https://blog.csdn.net/liyf155/article/details/61419623

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安装前检查服务器是否已安装MySQL，如已安装则将其卸载:

rpm -qa|grep mysql

mysql-libs-5.1.71-1.el6.x86_64

rpm -e --nodeps mysql-libs-5.1.71-1.el6.x86_64 //卸载

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将下载的文件进行解压：

tar -xf mysql-5.7.12-1.el6.x86_64.rpm-bundle.tar

按顺序依次安装：

1. rpm -ivh mysql-community-common-5.7.12-1.el6.x86_64.rpm

2. rpm -ivh mysql-community-libs-5.7.12-1.el6.x86_64.rpm

3. rpm -ivh mysql-community-devel-5.7.12-1.el6.x86_64.rpm

4. rpm -ivh mysql-community-client-5.7.12-1.el6.x86_64.rpm

5. rpm -ivh mysql-community-server-5.7.12-1.el6.x86_64.rpm

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http://blog.sina.com.cn/s/blog_714afb2b0102vx7l.html

如果出现这种报错：

file /usr/lib64/mysql/libmysqlclient.so.16.0.0 from install of mysql-libs-5.1.61-4.el6.x86_64 conflicts with file from package Percona-Server-shared-51-5.1.71-rel14.9.589.rhel6.x86_64
file /usr/lib64/mysql/libmysqlclient_r.so.16.0.0 from install of mysql-libs-5.1.61-4.el6.x86_64 conflicts with file from package Percona-Server-shared-51-5.1.71-rel14.9.589.rhel6.x86_64

解决方法：
yum -y remove Percona-Server-shared-51-5.1.71-rel14.9.589.rhel6.x86_64

然后继续安装

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service mysqld start ————————》启动服务

grep 'temporary password' /var/log / mysqld . log ————————》获取初始密码

mysql > set global validate_password_policy =0 ; —————— 》更改密码策略，默认 1 表示必须符合长度，且必须含有数字，小写或大写字母，特殊字符

mysql > set global validate_password_length =4 ; —————— 》更改密码长度，表示密码最小长度为4

mysql > SET PASSWORD FOR 'root'@'localhost' = PASSWORD('1234567'); —————— 》设置密码

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vim /etc/my.cnf ————》启动binlog日志

[mysqld]

log_bin=mysql-bin

server_id=1

MySQL 设置密码的三种方法：

其设置密码有三种方法:

a. ./mysqladmin -u root -p oldpassword newpasswd(记住这个命令是在/usr/local/mysql/bin中外部命令)

b. SET PASSWORD FOR root=PASSWORD(’new password’);（对登录数据库后这种方式）

c. UPDATE user SET password=PASSWORD(”new password”) WHERE user=’root’; 　（对登录数据库后这种方式）

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卸载mysql的方法：

首先停用mysql：　　service mysqld stop

第一步：卸载所有mysql包

[root@iZbp1ddkszxcmrqic0imjwZ ~]# rpm -qa | grep mysql

mysql-community-common-5.7.21-1.el6.x86_64

mysql-community-devel-5.7.21-1.el6.x86_64

mysql-community-server-5.7.21-1.el6.x86_64

mysql-community-libs-5.7.21-1.el6.x86_64

mysql-community-client-5.7.21-1.el6.x86_64

卸载命令： rpm -e --nodeps  mysql包

第二步：卸载mysql所有目录文件

[root@iZbp1ddkszxcmrqic0imjwZ ~]# find / -name mysql

/usr/share/mysql

/usr/include/mysql

/usr/include/mysql/mysql

/usr/bin/mysql

/usr/lib64/mysql

/root/mysql

/var/lib/mysql

/var/lib/mysql/mysql

/etc/logrotate.d/mysql

卸载命令： rm -rf  mysql路径

第三步：卸载my.cnf. 和  /var/log/mysqld.log  文件

rm -rf /etc/my.cnf

ok.  mysql卸载完成。。如果遇到本文中没有的错误，请及时留言和百度。