centos6.8 mysql5.7 rpm安装与完全卸载

一、查看centos版本

cat /etc/issue

安装mysql5.7

#下载rpm包
wget https://dev.mysql.com/get/Downloads/MySQL-5.7/mysql-5.7.19-1.el6.x86_64.rpm-bundle.tar
 
#创建mysql目录
mkdir /home/mysql
 
#解压
tar -xvf mysql-5.7.19-1.el6.x86_64.rpm-bundle.tar -C /home/mysql
 
#安装numactl和mysql
yum install -y numactl
 
cd /home/mysql
按以下顺序安装相关rpm：
安装cdh时需要
[root@arno-cents mysql]# rpm -ivh mysql-community-common-5.7.19-1.el6.x86_64.rpm
warning: mysql-community-common-5.7.19-1.el6.x86_64.rpm: Header V3 DSA/SHA1 Signature, key ID 5072e1f5: NOKEY
Preparing...                ########################################### [100%]
   1:mysql-community-common ########################################### [100%]
 
[root@arno-cents mysql]# rpm -ivh mysql-community-libs-5.7.19-1.el6.x86_64.rpm
warning: mysql-community-libs-5.7.19-1.el6.x86_64.rpm: Header V3 DSA/SHA1 Signature, key ID 5072e1f5: NOKEY
Preparing...                ########################################### [100%]
   1:mysql-community-libs   ########################################### [100%]
 
[root@arno-cents mysql]# rpm -ivh mysql-community-libs-compat-5.7.19-1.el6.x86_64.rpm
warning: mysql-community-libs-compat-5.7.19-1.el6.x86_64.rpm: Header V3 DSA/SHA1 Signature, key ID 5072e1f5: NOKEY
Preparing...                ########################################### [100%]
   1:mysql-community-libs-co########################################### [100%]
 
 
 
[root@arno-cents mysql]# rpm -ivh mysql-community-client-5.7.19-1.el6.x86_64.rpm
warning: mysql-community-client-5.7.19-1.el6.x86_64.rpm: Header V3 DSA/SHA1 Signature, key ID 5072e1f5: NOKEY
Preparing...                ########################################### [100%]
   1:mysql-community-client ########################################### [100%]
 
[root@arno-cents mysql]# rpm -ivh mysql-community-server-5.7.19-1.el6.x86_64.rpm
warning: mysql-community-server-5.7.19-1.el6.x86_64.rpm: Header V3 DSA/SHA1 Signature, key ID 5072e1f5: NOKEY
Preparing...                ########################################### [100%]
   1:mysql-community-server ########################################### [100%]
 
 
#启动mysql
 service mysqld start
#查看默认生成的密码
sudo grep 'temporary password' /var/log/mysqld.log
#登陆mysql
mysql -uroot -p
 
#第一次重设密码
ALTER USER 'root'@'localhost' IDENTIFIED BY '123456';
 
#修改host值
mysql>use mysql;
mysql> update user set host = '%' where user ='root';
mysql>flush privileges;
mysql> select host,user from user where user='root';
 
#修改为简单密码
#只验证密码长度
set global validate_password_policy=0;
mysql>flush privileges;
#查看密码长度
select @@validate_password_length;
修改默认密码的长度（这里修改为6）
set global validate_password_length=6;
mysql>flush privileges;
#重设密码为passwd
ALTER USER 'root'@'%' IDENTIFIED BY 'passwd';
mysql>flush privileges;
exit;
#设置开机自启动
chkconfig mysqld on
 
#重新用新密码登陆
mysql -uroot -ppasswd
 
mysql>  Grant all privileges on *.* to 'root'@'%' identified by 'passwd' with grant option;
Query OK, 0 rows affected, 1 warning (0.00 sec)
 
mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec) 

不按指定顺序安装mysql相关包会报如下类错误:

error: Failed dependencies:
        mysql-community-libs(x86-64) >= 5.7.9 is needed by mysql-community-client-5.7.13-1.el7.x86_64
        mariadb is obsoleted by mysql-community-client-5.7.13-1.el7.x86_64
 yum -y remove mysql-libs-*

使用Yum安装东西时，如果有强制退出过yum或yum异常结束，再下次使用yum命令时会提示：There are unfinished transactions remaining. You might consider running yum-complete-transaction first to finish them。
可以通过以下方法处理：

yum -y install yum-utils

yum clean all

yum-complete-transaction --cleanup-only
一 、yum方式安装的mysql

yum remove mysql mysql-server mysql-libs compat-mysql51
 
rm -rf /var/lib/mysql
 
rm /etc/my.cnf

查看是否还有mysql软件：

rpm -qa|grep mysql

如果存在的话，继续删除即可。

二、rpm方式安装的mysql

a）查看系统中是否以rpm包安装的mysql：

[root@arno-cents mysql]# rpm -qa | grep -i mysql
mysql-community-libs-5.7.19-1.el6.x86_64
mysql-community-client-5.7.19-1.el6.x86_64
mysql-community-server-5.7.19-1.el6.x86_64
mysql-community-common-5.7.19-1.el6.x86_64

b)依次卸载mysql

[root@arno-cents mysql]#rpm -e mysql-community-libs-5.7.19-1.el6.x86_64
[root@arno-cents mysql]# rpm -e ...

d)删除分散mysql文件夹

[root@arno-cents mysql]#  whereis mysql  
 
mysql: /usr/lib/mysql   /usr/share/mysql

清空相关mysql的所有目录以及文件

rm -rf /usr/lib/mysql
rm -rf /usr/share/mysql

[root@arno-cents mysql]#find / -name mysql
 
rm -rf  ...