CentOS7 安装MySQL

官方安装教程：

https://dev.mysql.com/doc/refman/5.7/en/linux-installation-yum-repo.html

1.查看是否已安装

1.查看系统中是否已安装 MySQL 服务

$ rpm -qa | grep mysql
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或

$ yum list installed | grep mysql
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2.如果已安装则删除 MySQL 及其依赖的包

$ yum -y remove mysql-libs.x86_64
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2.下载源

1.下载 mysql57-community-release-el7-8.noarch.rpm 的 YUM 源：

$ wget http://dev.mysql.com/get/mysql57-community-release-el7-8.noarch.rpm
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2.安装 mysql57-community-release-el7-8.noarch.rpm：

$ yum localinstall mysql57-community-release-el7-8.noarch.rpm
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3.检查mysql源是否安装成功

 yum repolist enabled | grep "mysql.*-community.*"
 
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[root@sinotest1 jenkins]# yum repolist enabled | grep "mysql.*-community.*"
mysql-connectors-community/x86_64        MySQL Connectors Community           51                                       
mysql-tools-community/x86_64             MySQL Tools Community                63                                       
mysql57-community/x86_64                 MySQL 5.7 Community Server          267 
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4.安装

1.安装 MySQL：

yum -y install mysql-community-server
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启动mysql:

systemctl start mysqld
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2.查找初始密码：

mysql安装完成之后，在 /var/log/mysqld.log 文件中给root生成了一个默认密码

grep 'temporary password' /var/log/mysqld.log
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打印如下内容：

[root@sinotest1 jenkins]# grep 'temporary password' /var/log/mysqld.log
2018-06-07T02:46:39.003245Z 1 
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