centos7 安装mysql5.7（二进制安装）

一、卸载默认安装的mariadb

[root@localhost ~]# yum remove mariadb* -y

二、添加mysql用户

[root@localhost ~]# useradd -s /sbin/nologin -M mysql
#-s 指定shell
#-M 不创建家目录

三、解压tar文件并移动到指定目录

[root@localhost ~]# tar zxvf mysql-5.7.25-linux-glibc2.12-x86_64.tar.gz 
[root@localhost ~]# mv mysql-5.7.25-linux-glibc2.12-x86_64 mysql
[root@localhost ~]# mv mysql /usr/local/mysql

四、修改目录所属

[root@localhost ~]# chown -R mysql:mysql /usr/local/mysql/

五、初始化mysql

[root@localhost ~]# /usr/local/mysql/bin/mysqld --initialize --user=mysql --basedir=/usr/local/mysql --datadir=/usr/local/mysql/data
2019-08-08T01:26:04.343294Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2019-08-08T01:26:04.491621Z 0 [Warning] InnoDB: New log files created, LSN=45790
2019-08-08T01:26:04.530234Z 0 [Warning] InnoDB: Creating foreign key constraint system tables.
2019-08-08T01:26:04.587027Z 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: 7d4db01d-b97b-11e9-8ac2-000c290afcba.
2019-08-08T01:26:04.588261Z 0 [Warning] Gtid table is not ready to be used. Table 'mysql.gtid_executed' cannot be opened.
2019-08-08T01:26:04.590350Z 1 [Note] A temporary password is generated for root@localhost: 2op_Dr?L)klu 

六、创建系统服务，并修改参数

[root@localhost ~]# cp /usr/local/mysql/support-files/mysql.server  /etc/init.d/mysqld
[root@localhost ~]# vi /etc/init.d/mysqld 
basedir=/usr/local/mysql
datadir=/usr/local/mysql/data
#修改上边俩行参数，添加指定的mysql目录和数据目录

七、编辑配置文件

[root@localhost ~]# vi /etc/my.cnf 
[mysqld]
user= mysql
port= 3306
socket=/tmp/mysql.sock
basedir=/usr/local/mysql
datadir=/usr/local/mysql/data
log-error=/usr/local/mysql/data/mysql.log
pid-file=/usr/local/mysql/data/mysql.pid
character-set-server=utf8
collation-server=utf8_bin

八、添加环境变量

[root@localhost ~]# vi .bash_profile
PATH=$PATH:$HOME/bin:/usr/local/mysql/bin
#添加上边这行环境变量
[root@localhost ~]# source .bash_profile 

九、启动mysql

[root@localhost ~]# /etc/init.d/mysqld start
Starting MySQL. SUCCESS! 

十、修改mysql密码及允许远程登录

[root@localhost ~]# mysql -uroot -p
Enter password:     #密码为初始化时，自动生成的密码
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> set password=password('123456');
Query OK, 0 rows affected, 1 warning (0.00 sec)

mysql> use mysql;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Database changed

mysql> select host,user from user; 
+-----------+---------------+
| host      | user          |
+-----------+---------------+
| localhost | mysql.session |
| localhost | mysql.sys     |
| localhost | root          |
+-----------+---------------+
3 rows in set (0.00 sec)

mysql> update user set host='%' where user='root';
Query OK, 1 row affected (0.00 sec)
Rows matched: 1  Changed: 1  Warnings: 0

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

十一、添加系统服务及设置自启动

[root@localhost ~]# chkconfig --add mysqld
[root@localhost ~]# chkconfig --level 35 mysqld on

注：记得关闭防火墙或者添加防火墙策略