2021-06-15-【centos7 + MySQL5.7 安装】centos7 安装MySQL5.7

第一步、下载MySQL 安装包：

[root@localhost local]# wget https://dev.mysql.com/get/mysql57-community-release-el7-11.noarch.rpm

安装mysql 安装源：

[root@localhost local]#  yum -y localinstall mysql57-community-release-el7-11.noarch.rpm 

第二步，在线安装MySQL

[root@localhost local]# yum -y install mysql-community-server

等待时间比较久 note:如果这里发生错误centos7.8安装mysql5.7时Error: Unable to find a match: mysql-community-server

解决：
先执行：yum module disable mysql
再执行：yum -y install mysql-community-server

第三步、启动mysql 服务

[root@localhost local]# systemctl start mysqld

第四步，设置开机启动

[root@localhost local]# systemctl enable mysqld
 
[root@localhost local]# systemctl daemon-reload

第五步，修改root登录密码

mysql安装完成之后，会在/var/log/mysqld.log文件中给root生成了一个临时的默认密码。

[root@localhost local]# vim /var/log/mysqld.log

记住初始密码：
修改root 密码

[root@localhost local]# mysql -u root -p



mysql>  ALTER USER  root @ localhost  IDENTIFIED BY  daasan7ujm^YHN ;
Query OK, 0 rows affected (0.00 sec)
# 设置远程登录
mysql> GRANT ALL PRIVILEGES ON *.* TO  root @ %  IDENTIFIED BY  daasan7ujm^YHN  WITH GRANT OPTION;
Query OK, 0 rows affected, 1 warning (0.00 sec)

第六步，退出

mysql> exit

第七步，防火墙开放3306端口

自行百度

第八步，重启防火墙。

[root@localhost sysconfig]# service iptables  restart

第九步，配置mysql默认编码为utf-8

[root@localhost sysconfig]# vim /etc/my.cnf

添加如下代码

character_set_server=utf8
init_connect= SET NAMES utf8 

:wq 保存退出

第十步，重启MySQL

[root@localhost data]# systemctl restart mysqld

第十一步， root 用户登录查看编码

[root@localhost sysconfig]#  mysql -u root -p
Enter password: 
Welcome to the MySQL monitor.  Commands end with ; or g.
Your MySQL connection id is 2
Server version: 5.7.29 MySQL Community Server (GPL)

Copyright (c) 2000, 2020, 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> show variables like  %character% ;
+--------------------------+----------------------------+
| Variable_name            | Value                      |
+--------------------------+----------------------------+
| character_set_client     | utf8                       |
| character_set_connection | utf8                       |
| character_set_database   | utf8                       |
| character_set_filesystem | binary                     |
| character_set_results    | utf8                       |
| character_set_server     | utf8                       |
| character_set_system     | utf8                       |
| character_sets_dir       | /usr/share/mysql/charsets/ |
+--------------------------+----------------------------+
8 rows in set (0.00 sec)

done!