CentOS7下安装Mysql5.7(完整教程-yum源)

1、首先：若之前装过MysqL请先删除再进行安装：

2、安装wget

yum -y install wget

3、下载MysqL的源

wget http://dev.MysqL.com/get/MysqL57-community-release-el7-7.noarch.rpm

4、安装yum库

yum localinstall -y MysqL57-community-release-el7-7.noarch.rpm

5、安装MysqL

yum install -y MysqL-community-server

6、启动MysqL服务

systemctl start MysqLd.service

7、查看MysqL服务状态

systemctl status MysqLd.service

8、MysqL5.7在安装时第一次安装后会初始化一个随机密码，以下为查看初始随机密码的方式

grep 'temporary password' /var/log/MysqLd.log

9、先通过上面的密码来登录 MysqL并修改密码

MysqL -u root -p

10、如果报错

ERROR 2002 (HY000): Can't connect to local MysqL server through socket '/var/lib/MysqL/MysqL .sock' (2)

ERROR 2003 (HY000): Can't connect to MysqL server on '127.0.0.1' (111)

/etc/rc.d/init.d/MysqLd: line 259: cd: /usr/local/MysqL: No such file or directory

######1、先停止服务
[root@ecs-dc15 src]# systemctl stop MysqLd.service
[root@ecs-dc15 src]# systemctl status MysqLd.service
● MysqLd.service - MysqL Server
   Loaded: loaded (/usr/lib/systemd/system/MysqLd.service; enabled; vendor preset: disabled)
   Active: inactive (dead) since Thu 2020-05-07 10:58:16 CST; 1s ago
     Docs: man:MysqLd(8)
           http://dev.MysqL.com/doc/refman/en/using-systemd.html

May 07 10:39:43 ecs-dc15 systemd[1]: Starting LSB: start and stop MysqL...
May 07 10:39:43 ecs-dc15 systemd[1]: Started LSB: start and stop MysqL.
May 07 10:58:16 ecs-dc15 systemd[1]: Stopped MysqL Server.
#####2、重新开启
[root@ecs-dc15 src]# systemctl start MysqLd.service
[root@ecs-dc15 src]# systemctl status MysqLd.service
● MysqLd.service - MysqL Server
   Loaded: loaded (/usr/lib/systemd/system/MysqLd.service; enabled; vendor preset: disabled)
   Active: active (running) since Thu 2020-05-07 10:58:31 CST; 1s ago
     Docs: man:MysqLd(8)
           http://dev.MysqL.com/doc/refman/en/using-systemd.html
  Process: 7653 ExecStart=/usr/sbin/MysqLd --daemonize --pid-file=/var/run/MysqLd/MysqLd.pid $MysqLD_OPTS (code=exited, status=0/SUCCESS)
  Process: 7600 ExecStartPre=/usr/bin/MysqLd_pre_systemd (code=exited, status=0/SUCCESS)
 Main PID: 7656 (MysqLd)
   CGroup: /system.slice/MysqLd.service
           └─7656 /usr/sbin/MysqLd --daemonize --pid-file=/var/run/MysqLd/MysqLd.pid

May 07 10:58:26 ecs-dc15 systemd[1]: Starting MysqL Server...
May 07 10:58:31 ecs-dc15 systemd[1]: Started MysqL Server.

11、回到第8步，查看初始密码并修改密码

输入修改密码的命令：ALTER USER 'root'@'localhost' IDENTIFIED BY 'your password';
注意：MysqL5.7默认密码策略要求密码必须是 大小写字母 ，数字 ，特殊字母的组合，至少8位
设置MysqL可以被远程连接，在MysqL中运行命令：
在MysqL中运行：GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' IDENTIFIED BY 'your password' WITH GRANT OPTION;

云服务器的话，要去控制台修改安全组配置，添加3306端口开放

最后，用Navicat远程连接数据库

CentOS7下安装Mysql5.7(完整教程-yum源)

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