卸载MySQL

卸载MySQL5.7

1、关闭MySQL5.7服务

service mysqld stop

2、查看MySQL安装

rpm -qa|grep -i mysql

mysql-community-libs-5.7.35-1.el7.x86_64

mysql-community-libs-compat-5.7.35-1.el7.x86_64

mysql-community-common-5.7.35-1.el7.x86_64

mysql57-community-release-el7-11.noarch

mysql-community-server-5.7.35-1.el7.x86_64

mysql-community-client-5.7.35-1.el7.x86_64

 3、卸载MySQL服务

rpm -ev --nodeps mysql-community-libs-5.7.35-1.el7.x86_64
rpm -ev --nodeps mysql-community-libs-compat-5.7.35-1.el7.x86_64
rpm -ev --nodeps mysql-community-common-5.7.35-1.el7.x86_64
rpm -ev --nodeps mysql57-community-release-el7-11.noarch
rpm -ev --nodeps mysql-community-server-5.7.35-1.el7.x86_64
rpm -ev --nodeps mysql-community-client-5.7.35-1.el7.x86_64

4、查看MySQL服务

rpm -qa|grep -i mysql

安装MySQL5.7

 1、准备MySQL5.7安装包

mysql-5.7.35-linux-glibc2.12-x86_64.tar.gz

上传文件至/opt/

 2、解压文件

tar -xvf mysql-5.7.35-linux-glibc2.12-x86_64.tar.gz

3、移动并重命名

mv mysql-5.7.26-linux-glibc2.12-x86_64 /usr/local/mysql

4、创建mysql用户组和用户并修改权限

groupadd mysql
useradd -r -g mysql mysql

5、创建数据目录并赋予权限

mkdir -p  /data/mysql            
chown mysql:mysql -R /data/mysql 

6、配置my.cnf

vim /etc/my.cnf

bind-address=0.0.0.0

port=3306

user=mysql

basedir=/usr/local/mysql

datadir=/data/mysql

socket=/tmp/mysql.sock

log-error=/data/mysql/mysql.err

pid-file=/data/mysql/mysql.pid

#character config

character_set_server=utf8mb4

symbolic-links=0

explicit_defaults_for_timestamp=true

 7、初始化数据库

7.1 进入mysql的bin目录

cd /usr/local/mysql/bin/

7.2 初始化

./mysqld --defaults-file=/etc/my.cnf --basedir=/usr/local/mysql/ --datadir=/data/mysql/ --user=mysql --initialize

7.3 查看密码

cat /data/mysql/mysql.err

 8、启动mysql并修改root密码

8.1 将mysql.server复制至/etc/init.d/mysql

cp /usr/local/mysql/support-files/mysql.server /etc/init.d/mysql

8.2 启动mysql服务

service mysql start
ps -ef | grep mysql

8.3 登录mysql

./mysql -u root -p   #bin目录下

8.4 修改密码

SET PASSWORD = PASSWORD('root');
ALTER USER 'root'@'localhost' PASSWORD EXPIRE NEVER;
FLUSH PRIVILEGES; 

Q:Client does not support....consider upgrading Mysql client 的解决办法

USE mysql;
ALTER USER ‘root’@‘localhost’ IDENTIFIED WITH mysql_native_password BY ‘你自己的密码’;
FLUSH PRIVILEGES;

8.5 设置允许远程登录

use mysql
update user set host = '%' where user = 'root'; 
FLUSH PRIVILEGES;  

9、配置命令环境（链接文件）

ln -s  /usr/local/mysql/bin/mysql    /usr/bin