创建mysql的yum源文件,其他默认的yum源的配置文件不用动

vi mysql.repo 

[mysql]
name=mysql
baseurl=https://mirrors.cloud.tencent.com/mysql/yum/mysql-5.6-community-el7-x86_64/
enabled=1
gpgcheck=0

yum clean all
yum makecache fast

yum install -y mysql-community-server

yum -y install mysql-community-server ansible

systemctl start mysqld

默认没有密码

mysql -u root -p

添加密码

grant all on *.* to root@'%' identified by 'Tredis';
grant all on *.* to root@'localhost' identified by 'Tredis';
grant all on *.* to root@'test' identified by 'myPassword';
flush privileges;

卸载MySQL的步骤：
1.查看是否安装Mysql
[atguigu@hadoop102 module]$ rpm -qa | grep -i mysql
MySQL-client-5.6.24-1.el6.x86_64
MySQL-server-5.6.24-1.el6.x86_64
2.查看MySQL服务是否启动，关闭
[atguigu@hadoop102 module]$ sudo service mysql status
[sudo] password for atguigu:
MySQL running (2681) [确定]

[atguigu@hadoop102 module]$ sudo service mysql stop
Shutting down MySQL… [确定]
3.卸载MySQL安装的组件
[atguigu@hadoop102 module]$ sudo rpm -e MySQL-server-5.6.24-1.el6.x86_64
[sudo] password for atguigu:
[atguigu@hadoop102 module]$ sudo rpm -e MySQL-client-5.6.24-1.el6.x86_64
4.查找并删除MySQL相关的文件
[atguigu@hadoop102 module]$ whereis mysql
mysql: /usr/lib64/mysql

[atguigu@hadoop102 module]$ sudo find / -name mysql
/var/lib/mysql
/var/lib/mysql/mysql
/usr/lib64/mysql

[atguigu@hadoop102 module]$ sudo rm -rf /var/lib/mysql
[atguigu@hadoop102 module]$

sudo rm -rf /usr/lib64/mysql

2.4 MySql安装
2.4.1 安装包准备
1．查看mysql是否安装，如果安装了，卸载mysql
（1）查看
[root@hadoop102 桌面]# rpm -qa|grep mysql
mysql-libs-5.1.73-7.el6.x86_64
（2）卸载
[root@hadoop102 桌面]# rpm -e --nodeps mysql-libs-5.1.73-7.el6.x86_64
2．解压mysql-libs.zip文件到当前目录
[root@hadoop102 software]# unzip mysql-libs.zip
[root@hadoop102 software]# ls
mysql-libs.zip
mysql-libs
3．进入到mysql-libs文件夹下
[root@hadoop102 mysql-libs]# ll
总用量 76048
-rw-r–r--. 1 root root 18509960 3月 26 2015 MySQL-client-5.6.24-1.el6.x86_64.rpm
-rw-r–r--. 1 root root 3575135 12月 1 2013 mysql-connector-java-5.1.27.tar.gz
-rw-r–r--. 1 root root 55782196 3月 26 2015 MySQL-server-5.6.24-1.el6.x86_64.rpm
2.4.2 安装MySql服务器
1．安装mysql服务端
[root@hadoop102 mysql-libs]# rpm -ivh MySQL-server-5.6.24-1.el6.x86_64.rpm
2．查看产生的随机密码
[root@hadoop102 mysql-libs]# cat /root/.mysql_secret
OEXaQuS8IWkG19Xs
3．查看mysql状态
[root@hadoop102 mysql-libs]# service mysql status
4．启动mysql
[root@hadoop102 mysql-libs]# service mysql start
2.4.3 安装MySql客户端
1．安装mysql客户端
[root@hadoop102 mysql-libs]# rpm -ivh MySQL-client-5.6.24-1.el6.x86_64.rpm
2．链接mysql
[root@hadoop102 mysql-libs]# mysql -uroot -pOEXaQuS8IWkG19Xs
3．修改密码
mysql>SET PASSWORD=PASSWORd('000000');
4．退出mysql
mysql>exit
2.4.4 MySql中user表中主机配置
配置只要是root用户+密码，在任何主机上都能登录MySQL数据库。
1．进入mysql
[root@hadoop102 mysql-libs]# mysql -uroot -p000000
2．显示数据库
mysql>show databases;
3．使用mysql数据库
mysql>use mysql;
4．展示mysql数据库中的所有表
mysql>show tables;
5．展示user表的结构
mysql>desc user;
6．查询user表
mysql>select User, Host, Password from user;
7．修改user表，把Host表内容修改为%
mysql>update user set host='%' where host='localhost';
8．删除root用户的其他host
mysql>delete from user where Host='hadoop102';
mysql>delete from user where Host='127.0.0.1';
mysql>delete from user where Host='::1';
9．刷新
mysql>flush privileges;
10．退出
mysql>quit;