ubuntu mysql 5.6 安装与双机热备 问题及解决方案汇总2

主机配备salve：
主机上 Mysql 执行：
grant replication slave on *.* to slave@'172.36.8.%' identified by 'passwd';




修改主从配置：


1）主机操作
#mysql -uroot -passwd
mysql>create database yccs_admin;
mysql>grant replication slave on *.* to 'root'@'192.168.0.124' identified by 'passwd';
编辑my.cny
在【mysqld】中去除下面注释：
servier-id  = 1
log_bin  = /var/log/mysql/mysql-bin.log
binlog-do-db= your_dbname           //如果有多个数据库需要同步，重复此参数，每个数据库一行
binlog-ignore-db=mysql //不同步的数据库
重新启动mysql
service mysql restart
通过命令查看：
show master status ；  //通过该命令获取file和position，这个在配置slave的时候有用
2）从机配置
编辑【mysqld】
server-id  = 2
replicate-do-db=your_dbname
replicate-ignore-db=mysql
slave-skip-errors= 1062   //加上这条
从新启动mysql服务
service mysql restart
登录并创建数据库：
mysql -uroot -ppasswd
create database yccs_admin；
3）在主从服务器上执行
主： mysql> flush master;    flush  logs;
从：mysql> flush slave; flush logs;
4)在从服务器上执行如下命令
mysql>stop slave;
mysql>change master to master_host='192.168.0.123',master_user=’root',master_password='passwd',master_port=3306,
master_log_file='mysql-bin.000001',master_log_pos=107;
mysql>start slave;
mysql>show slave status\G
如果slave_IO_running:yes     slave_sql_running:yes,那说明没有问题了，就可以再主机上面建库建表写测试数据了，然后
在从机器上查看有没有数据同步过来。

期间会遇到一些问题：

从机上执行：

show slave status\G;

      Last_IO_Errno: 1236
                Last_IO_Error: Got fatal error 1236 from master when reading data from binary log: 'binlog truncated in the middle of event; consider out of disk space on master; the first event 'mysql-bin.000001' at 107, the last event read from '/var/log/mysql/mysql-bin.000001' at 107, the last byte read from '/var/log/mysql/mysql-bin.000001' at 126.'
               Last_SQL_Errno: 0
               Last_SQL_Error:

ERROR:

mysql主从库不同步解决方法
遇到这样的错误如：“Last_IO_Error: Got fatal error 1236 from master when reading data from binary log: 'Could not find first log file name in binary log index file'”等或由于清数据导致主从库不同步了，解决办法如下：
先进入slave中执行:"slave stop;"来停止从库同步；
再去master中执行:"flush logs;"来清空日志；
然后在master中执行:"show master status;"查看下主库的状态，主要是日志的文件和position；
mysql> show master status;
+------------------+----------+--------------+------------------+-------------------+
| File             | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+------------------+----------+--------------+------------------+-------------------+
| mysql-bin.000006 |      120 | DATABASSE     | mysql            |                   |
+------------------+----------+--------------+------------------+-------------------+
1 row in set (0.00 sec)

然后回到slave中，执行:"CHANGE MASTER TO MASTER_LOG_FILE='log-bin.000004',MASTER_LOG_POS=106;"，文件和位置对应master中的;
最后在slave中执行:"slave start;"来启动同步。
当你幸福的时候，我不在，当我幸福的时候，你也不在

change master to master_host='172.16.8.66',master_user='root',master_password='PASSWD',master_port=3306,master_log_file='mysql-bin.000006',master_log_pos=120;


mysql> show slave status\G;
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 172.16.。。
                  Master_User: root
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000006
          Read_Master_Log_Pos: 120
               Relay_Log_File: ubuntu-relay-bin.000002
                Relay_Log_Pos: 283
        Relay_Master_Log_File: mysql-bin.000006
             Slave_IO_Running: Yes
            Slave_SQL_Running: Yes
              Replicate_Do_DB: DATABASE
          Replicate_Ignore_DB: mysql
           Replicate_Do_Table:
       Replicate_Ignore_Table:
      Replicate_Wild_Do_Table:
  Replicate_Wild_Ignore_Table:
                   Last_Errno: 0
                   Last_Error:
                 Skip_Counter: 0
          Exec_Master_Log_Pos: 120
              Relay_Log_Space: 457
              Until_Condition: None
               Until_Log_File:
                Until_Log_Pos: 0
           Master_SSL_Allowed: No
           Master_SSL_CA_File:
           Master_SSL_CA_Path:
              Master_SSL_Cert:
            Master_SSL_Cipher:
               Master_SSL_Key:
        Seconds_Behind_Master: 0
Master_SSL_Verify_Server_Cert: No
                Last_IO_Errno: 0
                Last_IO_Error:
               Last_SQL_Errno: 0
               Last_SQL_Error:
  Replicate_Ignore_Server_Ids:
             Master_Server_Id: 1
                  Master_UUID: 8750084d-3197-11e3-863d-0050569b1e91
             Master_Info_File: /opt/mysql/data/master.info
                    SQL_Delay: 0
          SQL_Remaining_Delay: NULL
      Slave_SQL_Running_State: Slave has read all relay log; waiting for the slave I/O thread to update it
           Master_Retry_Count: 86400
                  Master_Bind:
      Last_IO_Error_Timestamp:
     Last_SQL_Error_Timestamp:
               Master_SSL_Crl:
           Master_SSL_Crlpath:
           Retrieved_Gtid_Set:
            Executed_Gtid_Set:
                Auto_Position: 0
1 row in set (0.00 sec)

ERROR:
No query specified

主从同步问题已经解决；