找到mysql5.6的centos的repo源，终于解决mysql的安装问题：
1.确保centos安装了wget，没有的话安装wget
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yum install wget |
2.下载mysql的repo源
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wget http://repo.mysql.com/mysql-community-release-el7-5.noarch.rpm |
3.安装mysql-community-release-el7-5.noarch.rpm包
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rpm -ivh mysql-community-release-el7-5.noarch.rpm |
4.安装这个包后，会获得两个mysql的yum repo源
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[root@localhost ~]# ls -1 /etc/yum.repos.d/mysql-community*/etc/yum.repos.d/mysql-community.repo/etc/yum.repos.d/mysql-community-source.repo[root@localhost ~]# |
5.然后安装mysql
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yum install mysql-server |