MHA 切換的2個異常(masterha_master_switch line 53)

MHA 切換的2個異常(masterha_master_switch line 53)

MHA 在測試手動容錯移轉和線上切換的過程中，碰到了2個比較詭異的問題，在使用IP地址調用的時候均無法測試成功，出現了Detected dead master xxx does not match with specified dead master以及xxx is not alive。下面是這2個錯誤問題的描述及解決方案。

1、MHA設定檔
[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、手動容錯移轉時的錯誤提示
[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=<dead_master_ip> is not set. Using 192.168.1.6.
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、線上切換時的錯誤提示
[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 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)

It is better to execute FLUSH NO_WRITE_TO_BINLOG TABLES on the master before switching. Is it ok to execute on vdbsrv1(192.168.1.6:3306)? (YES/no): yes
Tue Apr 21 11:50:41 2015 - [info] Executing FLUSH NO_WRITE_TO_BINLOG TABLES. This may take long time..
Tue Apr 21 11:50:41 2015 - [info]  ok.
Tue Apr 21 11:50:41 2015 - [info] Checking MHA is not monitoring or doing failover..
Tue Apr 21 11:50:41 2015 - [info] Checking replication health on vdbsrv2..
Tue Apr 21 11:50:41 2015 - [info]  ok.
Tue Apr 21 11:50:41 2015 - [info] Checking replication health on vdbsrv3..
Tue Apr 21 11:50:41 2015 - [info]  ok.
Tue Apr 21 11:50:41 2015 - [error][/usr/lib/perl5/site_perl/5.8.8/MHA/MasterRotate.pm, ln228] 192.168.1.8 is not alive!
Tue Apr 21 11:50:41 2015 - [error][/usr/lib/perl5/site_perl/5.8.8/MHA/MasterRotate.pm, ln613] Failed to get new master!
Tue Apr 21 11:50:41 2015 - [error][/usr/lib/perl5/site_perl/5.8.8/MHA/MasterRotate.pm, ln652] Got ERROR:  at /usr/bin/masterha_master_switch line 53

 

4、解決方案
      直接將IP地址替換為主機名稱後問題解決，不再示範。

      按官方文檔描述，參數--dead_master_host=(hostname)，而不是可以用IP地址。

      If these parameters are not set, --dead_master_ip will be the result of gethostbyname(dead_master_host), and --dead_master_port will be 3306.

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