centos7 安装与卸载 Mysql 5.7.27(详细完整教程）

目录

卸载

安装

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卸载

1、关闭MySQL服务

 systemctl stop mysqld

2、使用 rpm 命令查看已安装的安装包 

[name@VM-20-12-centos mysql1]$ rpm -qa|grep mysql

 3、使用yum卸载安装的mysql

[name@VM-20-12-centos mysql1]$ sudo yum remove  mysql mysql-server mysql-libs mysql-server

4、查询剩余的安装包

[name@VM-20-12-centos mysql1]$ rpm -qa|grep mysql

 5、移除掉这些安装包

[name@VM-20-12-centos mysql1]$ sudo rpm -ev mysql-community-release-el7-5.noarch
[name@VM-20-12-centos mysql1]$ sudo rpm -ev mysql-community-common-5.6.51-2.el7.x86_64

 6、检查残余安装包

[name@VM-20-12-centos mysql1]$ ls

7、删除残余的安装包 

sudo rm -rf mysql*

8、继续查找是否还有残留文件

[name@VM-20-12-centos mysql1]$ sudo find / -name mysql

 9、移除这些残留文件

[name@VM-20-12-centos mysql1]$ sudo rm -rf /etc/selinux/targeted/active/modules/100/mysql
[name@VM-20-12-centos mysql1]$ sudo rm -rf /usr/share/mysql
[name@VM-20-12-centos mysql1]$ sudo rm -rf /var/lib/mysql
[name@VM-20-12-centos mysql1]$ sudo rm -rf /var/lib/mysql/mysql

10.最后检查 

[name@VM-20-12-centos mysql1]$ rpm -qa|grep mysql
[name@VM-20-12-centos mysql1]$ sudo find / -name mysql
[name@VM-20-12-centos mysql1]$ ls

安装

1. 下载 MySQL yum包

wget http://repo.mysql.com/mysql57-community-release-el7-10.noarch.rpm

2.安装MySQL源

[name@VM-20-12-centos mysql1]$ sudo rpm -Uvh mysql57-community-release-el7-10.noarch.rpm

 3.安装MySQL服务端,需要等待一些时间

[name@VM-20-12-centos mysql1]$ yum -y install mysql-community-server --nogpgcheck

4.启动MySQL 

[name@VM-20-12-centos mysql1]$ systemctl start mysqld.service

 

5.检查是否启动成功 

[name@VM-20-12-centos mysql1]$ systemctl status mysqld.service

 6.获取临时密码，MySQL5.7为root用户随机生成了一个密码

[name@VM-20-12-centos mysql1]$ sudo grep 'temporary password' /var/log/mysqld.log 

7.通过临时密码登录MySQL，进行修改密码操作

[name@VM-20-12-centos mysql1]$ mysql -uroot -p

8.因为MySQL的密码规则需要很复杂，我们一般自己设置的不会设置成这样，所以我们全局修改一下 

mysql> set global validate_password_policy=0;
mysql> set global validate_password_length=1;

这时候我们就可以自己设置想要的密码了

mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY 'yourpassword';

 

9.授权其他机器远程登录 

mysql> GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' IDENTIFIED BY 'yourpassword' WITH GRANT 
OPTION;
mysql> FLUSH PRIVILEGES;
 

10.开启开机自启动

先退出mysql命令行，然后输入以下命令

[name@VM-20-12-centos mysql1]$ systemctl enable mysqld
[name@VM-20-12-centos mysql1]$ systemctl daemon-reload

 11.设置MySQL的字符集为UTF-8，令其支持中文

[name@VM-20-12-centos mysql1]$ sudo vim /etc/my.cnf

 改成如下,然后保存

# For advice on how to change settings please see
# http://dev.mysql.com/doc/refman/5.7/en/server-configuration-defaults.html
 
[mysql]
default-character-set=utf8
 
[mysqld]
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
default-storage-engine=INNODB
character_set_server=utf8
 
symbolic-links=0
 
log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid

 12.重启一下MySQL,令配置生效

[name@VM-20-12-centos mysql1]$ service mysqld restart

13.确保你在终端命令行可以输入中文

[name@VM-20-12-centos mysql1]$  env |grep LANG

14.数据库的操作 

（1）查看mysql是否启动：service mysqld status
启动mysql：service mysqld start
停止mysql：service mysqld stop
重启mysql：service mysqld restart
（2）查看临时密码：grep password /var/log/mysqld.log

查看数据库是否服务起来

[name@VM-20-12-centos mysql1]$ ps ajx | grep mysql

[name@VM-20-12-centos mysql1]$ sudo netstat -nltp

客户端和服务端对应的路径

到这里就安装成功啦!!!赶快开始数据库的学习吧。