centos7 安装 mysql5.7.25

一、检查是否安装了mysql和mariadb，若已经安装就需要卸载。

[root@localhost ~]# rpm -qa|grep mariadb 　　// 查询出来已安装的mariadb
[root@localhost ~]# rpm -e --nodeps 文件名 　　// 卸载mariadb，文件名为上述命令查询出来的文件
[root@localhost ~]# rm /etc/my.cnf　　　　　　//删除配置文件

二、添加mysql用户及用户组

[root@localhost ~]# groupadd mysql    //创建mysql用户组
[root@localhost ~]# useradd -g mysql mysql      //创建mysql用户，并添加到mysql用户组

三、解压文件，并移动到指定的目录下

[root@localhost ~]# tar -zvxf mysql-5.7.25-linux-glibc2.12-x86_64.tar.gz
[root@localhost ~]# mv 解压出来的文件夹名 mysql
[root@localhost ~]# mv mysql /usr/local/

四、创建配置文件

[root@localhost support-files]# vim /etc/my.cnf
#通过vim编辑器编辑my.cnf代码如下：

[mysqld]
sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES

basedir = /usr/local/mysql
datadir = /usr/local/mysql/data
port = 3306
socket = /tmp/mysql.sock
character-set-server=utf8

log-error = /usr/local/mysql/data/mysqld.log
pid-file = /usr/local/mysql/data/mysqld.pid

五、初始化数据库

[root@localhost ~]# cd /usr/local/mysql/bin/
[root@localhost bin]# ./mysqld --initialize --user=mysql --basedir=/usr/local/mysql/ --datadir=/usr/local/mysql/data/

六、查看初始默认密码

[root@localhost bin]# cat /usr/local/mysql/data/mysqld.log       
2019-06-05T07:08:28.263392Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2019-06-05T07:08:28.263457Z 0 [Warning] 'NO_ZERO_DATE', 'NO_ZERO_IN_DATE' and 'ERROR_FOR_DIVISION_BY_ZERO' sql modes should be used with strict mode. They will be merged with strict mode in a future release.
2019-06-05T07:08:28.263462Z 0 [Warning] 'NO_AUTO_CREATE_USER' sql mode was not set.
2019-06-05T07:08:28.961752Z 0 [Warning] InnoDB: New log files created, LSN=45790
2019-06-05T07:08:29.039265Z 0 [Warning] InnoDB: Creating foreign key constraint system tables.
2019-06-05T07:08:29.095290Z 0 [Warning] No existing UUID has been found, so we assume that this is the first time that this server has been started. Generating a new UUID: b858de41-8760-11e9-84f3-00505681edfc.
2019-06-05T07:08:29.096413Z 0 [Warning] Gtid table is not ready to be used. Table 'mysql.gtid_executed' cannot be opened.
2019-06-05T07:08:29.096953Z 1 [Note] A temporary password is generated for root@localhost: kXJh+_RMu52K

七、将启动脚本放到开机初始化目录

[root@localhost ~]# cp /usr/local/mysql/support-files/mysql.server /etc/init.d/mysql

八、启动mysql

[root@localhost ~]# service mysql start
Starting MySQL. SUCCESS! 

九、使用root账号和默认密码登录mysql

[root@localhost ~]# cd /usr/local/mysql/bin/
[root@localhost bin]# ./mysql -uroot -p
Enter password: 
Welcome to the MySQL monitor.  Commands end with ; or g.
Your MySQL connection id is 2
Server version: 5.7.25

Copyright (c) 2000, 2019, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or 'h' for help. Type 'c' to clear the current input statement.

mysql> 

十、修改root密码

mysql> set password=password('root');
Query OK, 0 rows affected, 1 warning (0.00 sec)

mysql> grant all privileges on *.* to root@'%' identified by '1234567890';
Query OK, 0 rows affected, 1 warning (0.01 sec)

mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)

十一、添加远程访问权限

mysql> GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' IDENTIFIED BY '1234567890' WITH GRANT OPTION;
Query OK, 0 rows affected, 1 warning (0.00 sec)

十二、重启mysql

[root@localhost bin]# service mysql restart
Shutting down MySQL.. SUCCESS! 
Starting MySQL. SUCCESS!