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==========运维之路

• 环境如下

[root@Centos ~]# cat /etc/redhat-release CentOS Linux release 7.5.1804 (Core) [root@Centos ~]# systemctl status firewalld.service    firewalld.service - firewalld - dynamic firewall daemon   Loaded: loaded (/usr/lib/systemd/system/firewalld.service; disabled; vendor preset: enabled)   Active: inactive (dead)     Docs: man:firewalld(1)[root@Centos ~]# getenforce Disabled

• 添加 Yum 源

[root@Centos ~]# rpm -ivh https://dev.mysql.com/get/mysql80-community-release-el7-1.noarch.rpm

• 检查 Yum 源
  默认版本为 Mysql 8.0

[root@Centos ~]# yum repolist all | grep mysqlmysql80-community/x86_64           MySQL 8.0 Community Server    enabled:     33mysql80-community-source           MySQL 8.0 Community Server -  disabled

• 选择 Mysql 版本
  默认版本为 Mysql 8.0 ，这里改为 Mysql 5.7

[root@Centos ~]# yum-config-manager --disable mysql80-community[root@Centos ~]# yum-config-manager --enable mysql57-community# 或者[root@Centos ~]# vi /etc/yum.repos.d/mysql-community.repo [mysql57-community]name=MySQL 5.7 Community Serverbaseurl=http://repo.mysql.com/yum/mysql-5.7-community/el/6/$basearch/enabled=1              #enabled等于1即为选择该版本gpgcheck=1gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql [mysql80-community]name=MySQL 8.0 Community Serverbaseurl=http://repo.mysql.com/yum/mysql-8.0-community/el/6/$basearch/enabled=0              #将默认8.0版本关闭gpgcheck=1gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql

• 下载 Mysql

[root@Centos ~]# yum install -y mysql-community-server

• 启动 Mysql

[root@Centos ~]# systemctl start mysqld

• 获取密码

[root@Centos ~]# grep 'temporary password' /var/log/mysqld.log2018-09-07T09:18:38.526311Z 1 [Note] A temporary password is generated for root@localhost: m;:)n3;*:1wE

• 连接 Mysql

[root@Centos ~]# mysql -uroot -pEnter password:        #输入上一步获取到的密码 m;:)n3;*:1wE

• 更改密码

# 新密码不少于8位，至少有1个大小写字母，1个数字，1个特殊字符mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY 'MyNewPass4!';Query OK, 0 rows affected (0.00 sec)

• 来自官方文档

https://dev.mysql.com/doc/refman/8.0/en/linux-installation-yum-repo.html