MHA 在测试手动故障转移和在线切换的过程中，碰到了2个比较诡异的问题，在使用IP地址调用的时候均无法测试成功，出现了Detected dead master xxx does not match with specified dead master以及xxx is not alive。下面是这2个错误问题的描述及解决方案。
1、MHA配置文件
[root@vdbsrv4 ~]# more /etc/masterha/app1.cnf
[server default]
manager_workdir=/var/log/masterha/app1
manager_log=/var/log/masterha/app1/manager.log
user=mha
password=xxx
ssh_user=root
repl_user=repl?
repl_password=repl?
ping_interval=1
shutdown_script=""
master_ip_online_change_script=""
report_script=""
#master_ip_failover_script=/usr/bin/master_ip_failover
master_ip_failover_script=/tmp/master_ip_failover
?
[server1]
hostname=vdbsrv1
master_binlog_dir=/data/mysqldata
[server2]
hostname=vdbsrv2
master_binlog_dir=/data/mysqldata
[server3]
hostname=vdbsrv3
master_binlog_dir=/data/mysqldata/
#candidate_master=1
?
2、手动故障转移时的错误提示
[root@vdbsrv4 ~]# masterha_master_switch --master_state=dead --conf=/etc/masterha/app1.cnf --dead_master_host=192.168.1.6 \
> --dead_master_port=3306 --new_master_host=192.168.1.8 --new_master_port=3306 --ignore_last_failover
--dead_master_ip=
Wed Apr 21 09:08:30 2015 - [warning] Global configuration file /etc/masterha_default.cnf not found. Skipping.
Wed Apr 21 09:08:30 2015 - [info] Reading application default configuration from /etc/masterha/app1.cnf..
Wed Apr 21 09:08:30 2015 - [info] Reading server configuration from /etc/masterha/app1.cnf..
Wed Apr 21 09:08:30 2015 - [info] MHA::MasterFailover version 0.56.
Wed Apr 21 09:08:30 2015 - [info] Starting master failover.
Wed Apr 21 09:08:30 2015 - [info]
Wed Apr 21 09:08:30 2015 - [info] * Phase 1: Configuration Check Phase..
Wed Apr 21 09:08:30 2015 - [info]
Wed Apr 21 09:08:31 2015 - [info] GTID failover mode = 0
Wed Apr 21 09:08:31 2015 - [error][/usr/lib/perl5/site_perl/5.8.8/MHA/MasterFailover.pm, ln2083] Detected dead master vdbsrv1(192.168.1.6:3306)
? does not match with specified dead master 192.168.1.6(192.168.1.6:3306)!
Wed Apr 21 09:08:31 2015 - [error][/usr/lib/perl5/site_perl/5.8.8/MHA/MasterFailover.pm, ln2151]
? Got ERROR:? at /usr/bin/masterha_master_switch line 53
?
3、在线切换时的错误提示
[root@vdbsrv4 ~]# masterha_master_switch --conf=/etc/masterha/app1.cnf --master_state=alive --new_master_host=192.168.1.8 \
> --orig_master_is_new_slave --running_updates_limit=10000
Tue Apr 21 11:50:14 2015 - [info] MHA::MasterRotate version 0.56.
Tue Apr 21 11:50:14 2015 - [info] Starting online master switch..
Tue Apr 21 11:50:14 2015 - [info]
Tue Apr 21 11:50:14 2015 - [info] * Phase 1: Configuration Check Phase..
Tue Apr 21 11:50:14 2015 - [info]
Tue Apr 21 11:50:14 2015 - [warning] Global configuration file /etc/masterha_default.cnf not found. Skipping.
Tue Apr 21 11:50:14 2015 - [info] Reading application default configuration from /etc/masterha/app1.cnf..
Tue Apr 21 11:50:14 2015 - [info] Reading server configuration from /etc/masterha/app1.cnf..
Tue Apr 21 11:50:14 2015 - [info] GTID failover mode = 0
Tue Apr 21 11:50:14 2015 - [info] Current Alive Master: vdbsrv1(192.168.1.6:3306)
Tue Apr 21 11:50:14 2015 - [info] Alive Slaves:
Tue Apr 21 11:50:14 2015 - [info]? vdbsrv2(192.168.1.7:3306)? Version=5.6.22-log (oldest major version between slaves) log-bin:enabled
Tue Apr 21 11:50:14 2015 - [info]? ? Replicating from 192.168.1.6(192.168.1.6:3306)
Tue Apr 21 11:50:14 2015 - [info]? vdbsrv3(192.168.1.8:3306)? Version=5.6.22-log (oldest