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rpm -qa mariadb*

yum remove mariadb-libs-5.5.56-2.el7.x86_64-y

rpm -ivh mysql-community-common-5.7.9-1.el7.x86_64.rpm

rpm -ivh  mysql-community-libs-5.7.9-1.el7.x86_64.rpm

rpm -ivh mysql-community-libs-compat-5.7.9-1.el7.x86_64.rpm

rpm -ivh  mysql-community-devel-5.7.9-1.el7.x86_64.rpm

rpm -ivh mysql-community-client-5.7.9-1.el7.x86_64.rpm

错误：

[root@s153mysqlrpm]# rpm -ivh mysql-community-server-5.7.9-1.el7.x86_64.rpm

警告：mysql-community-server-5.7.9-1.el7.x86_64.rpm:头V3 DSA/SHA1 Signature, 密钥 ID 5072e1f5: NOKEY

错误：依赖检测失败：

        net-tools 被mysql-community-server-5.7.9-1.el7.x86_64 需要

[root@s153mysqlrpm]#

解决办法：

yum -yinstall net-tools

rpm-ivh mysql-community-server-5.7.9-1.el7.x86_64.rpm

问题:unblock with'mysqladmin flush-hosts'Connection closed by foreign host

解决办法：

http://www.cnblogs.com/susuyu/archive/2013/05/28/3104249.html

mysql>start slave;

ERROR1872 (HY000): Slave failed to initialize relay log info structure from therepository

解决办法：重新做主从

stopslave;

resetslave;

changemaster to

master_host='masterip',

master_user='slave',

master_password='123456',

master_port=3306,

master_log_file='mysql-bin.000145',

master_log_pos=193963694;

showslave status \G 报错

 Got fatal error 1236 from master when readingdata from binary log: 'A

 slave with the same server_uuid as this slavehas connected to the master;

 the first event 'mysql-bin.000155' at193963604, the last event read from

 './mysql-bin.000155' at 123, the last byteread from './mysql-bin.000155' at 193963604.'

showvariables like 'server_id';

mv datadir/auto.cnf /tmp

systemctl restart mysqld

主要是拷贝auto.cnf 重复

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