mysql> SHOW SLAVE STATUS\G;
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.199.151
Master_User: t1
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin.000001
Read_Master_Log_Pos: 151
Relay_Log_File: t1-relay-bin.000001
Relay_Log_Pos: 4
Relay_Master_Log_File:
Slave_IO_Running: Yes
Slave_SQL_Running: No
Replicate_Do_DB:
Replicate_Ignore_DB:
Replicate_Do_Table:
Replicate_Ignore_Table:
Replicate_Wild_Do_Table:
Replicate_Wild_Ignore_Table:
Last_Errno: 1
Last_Error: Unable to use slave's temporary directory /var/tmp | - Can't read dir of '/var/tmp |/' (Errcode: 2 - No such file or directory)
Skip_Counter: 0
Exec_Master_Log_Pos: 0
Relay_Log_Space: 562
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: NULL
Master_SSL_Verify_Server_Cert: No
Last_IO_Errno: 0
Last_IO_Error:
Last_SQL_Errno: 12
Last_SQL_Error: Unable to use slave's temporary directory /var/tmp | - Can't read dir of '/var/tmp |/' (Errcode: 2 - No such file or directory)
Replicate_Ignore_Server_Ids:
Master_Server_Id: 11
Master_UUID: 3fb17f98-e5e3-11e5-a895-000c29c89983
Master_Info_File: mysql.slave_master_info
SQL_Delay: 0
SQL_Remaining_Delay: NULL
Slave_SQL_Running_State:
Master_Retry_Count: 86400
Master_Bind:
Last_IO_Error_Timestamp:
Last_SQL_Error_Timestamp: 160309 19:33:03
Master_SSL_Crl:
Master_SSL_Crlpath:
Retrieved_Gtid_Set:
Executed_Gtid_Set:
Auto_Position: 1
1 row in set (0.00 sec)
ERROR:
No query specified
环境：
centos 6.5
mysql 5.6.10
主 ---主----从---从---从
也适用：
主----------从
主从切换之后，出现上面问题：
解决：
vim /etc/my.cnf
basedir = /usr/local/mysql
datadir = /mydata/data
#slave_load_tmpdir = /var/tmp #注释
#tmpdir = /var/tmp #注释
pid-file = /mydata/data/t1.pid
socket=/tmp/mysql.sock
port=3306
# read_rnd_buffer_size = 2M
mysql出问题，找不到问题排错建议：
先看 主机名.err ,然后再思考my.cnf配置参数，建议精通。
对应此文章答案：
http://blog.csdn.net/u010098331/article/details/50837688（问题答案）