centos mysql安装与卸载

下载解压

1. 下载mysql

2. 解压重命名

   tar -zxvf mysql-5.7.25-linux-glibc2.12-x86_64.tar.gz -C /usr/local/
   mv /usr/local/mysql-5.7.25-linux-glibc2.12-x86_64/ /usr/local/mysql
   

3. 创建data目录

   mkdir /usr/local/mysql/data
   

创建mysql用户和用户组

1. 创建用户组

   groupadd mysql
   

2. 创建用户

   useradd mysql -g mysql
   

3. 将/usr/local/mysql目录的所有者及所属组改为mysql

   chown -R mysql.mysql /usr/local/mysql
   

配置

1. 初始化（此步骤可能出现缺少依赖，安装对应依赖即可）

   /usr/local/mysql/bin/mysqld --user=mysql --basedir=/usr/local/mysql/ --datadir=/usr/local/mysql/data --initialize
   

   [Note] A temporary password is generated for root@localhost: A4fn_Us%o% 注：执行初始化后会生成一个临时密码, 临时密码：A4fn_Us%o%

2. 编辑/etc/my.cnf配置文件

   vim /etc/my.cnf
   

   [mysqld]
   #创建的data目录
   datadir=/usr/local/mysql/data
   #mysql安装目录
   basedir=/usr/local/mysql
   socket=/tmp/mysql.sock
          
   #跳过密码验证
   #skip-grant-tables
   character-set-server=utf8
   symbolic-links=0
          
   [mysqld_safe]
   log-error=/var/log/mysqld.log
   pid-file=/var/run/mysqld/mysqld.pid
   

启动服务

1. 将mysql添加到服务脚本中

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

2. 启动

    service mysql start
   

重置密码及开启远程连接

1. 连接mysql: 密码为初始化生成的临时密码

   /usr/local/mysql/bin/mysql -u root -p 
   

2. 重置密码

   mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY '重置的密码';  
   

3. 开启远程连接

   mysql> use mysql;
   mysql> update user set host='%' where user = 'root';
   mysql> flush privileges;
   mysql> exit;
   

卸载

1. 停止mysql服务

   service mysql stop
   

2. 删除mysql目录

   find / -name mysql -exec rm -rf {} \;
   sudo rm /etc/my.cnf
   

3. 删除mysql用户和用户组

   id mysql
   userdel mysql
   groupdel mysql
   

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