Centos MySQL数据库部署

mysql 下载地址

添加MySQL yum源

rpm -Uvh https://dev.mysql.com/get/mysql80-community-release-el7-3.noarch.rpm

获取https://dev.mysql.com/get/mysql80-community-release-el7-3.noarch.rpm
警告：/var/tmp/rpm-tmp.1Ws4Ob: 头V3 DSA/SHA1 Signature, 密钥 ID 5072e1f5: NOKEY
准备中...                          ################################# [100%]
正在升级/安装...
   1:mysql80-community-release-el7-3  ################################# [100%]

直接yum -y install mysql安装的是mariadb
此链接是mysql官网链接，请放心使用。

查看yum源中所有MySQL版本

yum repolist all | grep mysql

mysql57-community/x86_64           MySQL 5.7 Community Server       禁用
mysql57-community-source           MySQL 5.7 Community Server - Sou 禁用
mysql80-community/x86_64           MySQL 8.0 Community Server       启用:    177
mysql80-community-source           MySQL 8.0 Community Server - Sou 禁用

启用5.7版本，禁用8.0版本MySQL

1.yum -y install yum-utils（安装yum-config-manager指令）
2.yum-config-manager --disable mysql80-community
3.yum-config-manager --enable mysql57-community
4.yum repolist all | grep mysql

mysql57-community/x86_64           MySQL 5.7 Community Server       启用:    424
mysql57-community-source           MySQL 5.7 Community Server - Sou 禁用
mysql80-community/x86_64           MySQL 8.0 Community Server       禁用
mysql80-community-source           MySQL 8.0 Community Server - Sou 禁用

安装mysql

yum -y install mysql-community-server
下载有点慢  请耐心等到。。。

起服务，开机自启

systemctl start mysqld
systemctl enable mysqld

查看mysql初始密码

grep password /var/log/mysqld.log

2020-05-11T08:15:04.517710Z 1 [Note] A temporary password is generated for root@localhost: %JbzXj?0OGZJ

%JbzXj?0OGZJ 初始密码（随机生成的）

修改初始密码

mysqladmin -uroot -p'%JbzXj?0OGZJ' password

mysqladmin: [Warning] Using a password on the command line interface can be insecure.
New password:
Confirm new password:
warning: Since password will be sent to server in plain text, use ssl connection to ensure password safety.

输入命令mysqladmin -uroot -p’%JbzXj?0OGZJ’ password 按回车再输入新密码，新密码最好要数字+字母+大写字母，不然容易报错！！！

登陆数据库，并授权root

1.mysql -uroot -p新密码（登陆）
2.grant all on *.*(所有库表) to root@'%'（所有登录方式） identified by ‘密码’；

此处密码也要复杂一点，不然密码太简单容易报错！！！切记！！！