MHA 自动故障转移步骤及过程剖析

    MHA是众多使用MySQL数据库企业高可用的不二选择，它简单易用，功能强大，实现了基于MySQL replication架构的自动主从故障转移，本文主要描述了MHA自动切换的步骤，对切换过程做了演示以及进行了适当的分析，供大家参考和理解MHA以及MySQL的原理。

1、MHA自动切换的步骤 a、MHA manager启动时的校验阶段    根据配置文件校验复制配置以及识别当前的master    导致监控终止情形：复制配置异常，存在的异常slave，一些需要的脚本脚本异常    MHA manager启动前可以通过masterha_check_ssh以及masterha_check_repl检测

b、监控master server阶段    MHA manager启动成功后，输出日志[info] Ping(SELECT) succeeded, waiting until MySQL doesn't respond..    MHA会定期ping master，缺省的间隔为1秒，直到master死掉    MHA manager不会监控slave的状态，任意的Stopping/Restarting/Adding/Removing slaves不影响当前MHA监控    当添加或移除slave节点时，建议修改配置文件以及重启MHA manager 

c、侦测到master server异常阶段    3次连续ping master失败，参数secondary_check_script可用于double check

d、开启failover阶段    MHA再次读取配置文件(防止主从配置已更改)，校验master以及当前masetr的从库    MHA也会校验诸如复制异常以及是否存在一些从库有不同的主    启动failover（排除上次failover失败或者failover时间间隔太短）

e、隔离master server阶段（可选）

   如果配置文件定义了IP漂移脚本则此时会关闭master IP    如果配置文件定义了关闭master脚本，则调用脚本关闭master以避免脑裂

f、恢复一个新的master    从slave节点获取最新的end_log_pos (Read_Master_Log_Pos)位置    从上一步获取的位置开始，读取及保存crashed master全部二进制日志文件（ssh可达）    决定新的master（根据配置文件定义的优先级别）    产生差量的binary/relay log events并且apply到新的master

g、激活一个新的master    如果配置文件定义了IP漂移脚本则此时会将IP漂移到新master

i、恢复剩余的slave    对所有从库并行地产生差量binary/relay log events    并用apply差量binary/relay log events到各从库    启动复制 j、通知切换结果（可选）    邮件发送    备份作业，管理工具调整等

2、MHA配置信息  [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=/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

[root@vdbsrv1 ~]# more /etc/hosts 127.0.0.1    localhost.localdomain localhost 192.168.1.6  vdbsrv1  #master 192.168.1.7  vdbsrv2  #slave1 192.168.1.8  vdbsrv3  #slave2 192.168.1.12 vdbsrv4  #manager

mysql> show slave hosts; +-----------+---------+------+-----------+--------------------------------------+ | Server_id | Host    | Port | Master_id | Slave_UUID                           | +-----------+---------+------+-----------+--------------------------------------+ |      1001 | vdbsrv2 | 3306 |         1 | 75bef614-e342-11e4-921d-000c295fb2eb | |      1002 | vdbsrv3 | 3306 |         1 | 091f79b8-e386-11e4-93d5-000c2943c830 | +-----------+---------+------+-----------+--------------------------------------+ 2 rows in set (0.00 sec)

3、演示切换 ###开启主库VIP [root@vdbsrv4 ~]# ssh vdbsrv1 "/sbin/ifconfig eth0:0 192.168.1.13 netmask 255.255.255.0 up"

###开启MHA manager [root@vdbsrv4 ~]# nohup masterha_manager --conf=/etc/masterha/app1.cnf &

###使用sysbench产生事务 [root@vdbsrv1 ~]# sysbench --test=oltp           \ > --oltp-table-size=5000000      \ > --oltp-read-only=off           \ > --init-rng=on                  \ > --num-threads=16               \ > --max-requests=0               \ > --oltp-dist-type=uniform       \ > --max-time=180                 \ > --mysql-user=root              \ > --mysql-socket=/tmp/mysql.sock \ > --mysql-password=''            \ > --db-driver=mysql              \ > --mysql-table-engine=innodb    \ > --oltp-test-mode=complex       \ > --mysql-db=replicatedb run sysbench 0.4.12:  multi-threaded system evaluation benchmark

###从库vdbsrv2停止io进程以模拟io滞后 [root@vdbsrv2 ~]# mysql -e 'stop slave io_thread' [root@vdbsrv2 ~]# mysql -e 'show slave status\G' | egrep 'Slave_IO|Slave_SQL'                Slave_IO_State:              Slave_IO_Running: No           ###Author : Leshami             Slave_SQL_Running: Yes          ###Blog   : http://blog.csdn.net/leshami       Slave_SQL_Running_State: Slave has read all relay log; waiting for the slave I/O thread to update it

###2分钟后从库vdbsrv2启动io进程 [root@vdbsrv2 ~]# mysql -e 'start slave io_thread'

###从库vdbsrv3停止io进程以模拟io滞后 [root@vdbsrv3 ~]# mysql -e 'stop slave io_thread'

###模拟主库宕机 [root@vdbsrv4 ~]# ssh vdbsrv1 "killall -r mysqld"

###主库的sysbench被强制断开且伴随下列错误提示 [root@vdbsrv1 ~]#      ....... Doing OLTP test. Running mixed OLTP test Using Uniform distribution Using "BEGIN" for starting transactions Using auto_inc on the id column Threads started! ALERT: failed to execute mysql_stmt_execute(): Err1317 Query execution was interrupted FATAL: database error, exiting... ALERT: failed to execute mysql_stmt_execute(): Err1317 Query execution was interrupted FATAL: database error, exiting...

###查看VIP漂移情况 [root@vdbsrv4 app1]# grep VIP /var/log/masterha/app1/manager.log Disabling the VIP on old master: vdbsrv1 Enabling the VIP - 192.168.1.13/24 on the new master - vdbsrv2

###登陆到主机vdbsrv2 mysql mysql> show variables like '%hostname%'; +---------------+---------+ | Variable_name | Value   | +---------------+---------+ | hostname      | vdbsrv2 | +---------------+---------+ 1 row in set (0.00 sec)

###此时vdbsrv2已提升为master，vdbsrv3指向了vdbsrv2 mysql> show slave hosts; +-----------+---------+------+-----------+--------------------------------------+ | Server_id | Host    | Port | Master_id | Slave_UUID                           | +-----------+---------+------+-----------+--------------------------------------+ |      1002 | vdbsrv3 | 3306 |      1001 | 091f79b8-e386-11e4-93d5-000c2943c830 | +-----------+---------+------+-----------+--------------------------------------+ 1 row in set (0.00 sec)

4、MHA日志初步剖析

[root@vdbsrv4 ~]# ls -hltr /var/log/masterha/* total 32K -rw-r--r-- 1 root root 143 Apr 20 14:30 saved_master_binlog_from_vdbsrv1_3306_20150420143022.binlog -rw-r--r-- 1 root root 26K Apr 20 14:30 manager.log -rw-r--r-- 1 root root   0 Apr 20 14:30 app1.failover.complete

###具体日志信息manager.log

Mon Apr 20 14:27:41 2015 - [info] MHA::MasterMonitor version 0.56. Mon Apr 20 14:27:42 2015 - [info] GTID failover mode = 0 Mon Apr 20 14:27:42 2015 - [info] Dead Servers: Mon Apr 20 14:27:42 2015 - [info] Alive Servers: Mon Apr 20 14:27:42 2015 - [info]   vdbsrv1(192.168.1.6:3306) Mon Apr 20 14:27:42 2015 - [info]   vdbsrv2(192.168.1.7:3306) Mon Apr 20 14:27:42 2015 - [info]   vdbsrv3(192.168.1.8:3306) Mon Apr 20 14:27:42 2015 - [info] Alive Slaves: Mon Apr 20 14:27:42 2015 - [info]   vdbsrv2(192.168.1.7:3306)  Version=5.6.22-log (oldest major version between slaves) log-bin:enabled Mon Apr 20 14:27:42 2015 - [info]     Replicating from 192.168.1.6(192.168.1.6:3306) Mon Apr 20 14:27:42 2015 - [info]   vdbsrv3(192.168.1.8:3306)  Version=5.6.22-log (oldest major version between slaves) log-bin:enabled Mon Apr 20 14:27:42 2015 - [info]     Replicating from 192.168.1.6(192.168.1.6:3306) Mon Apr 20 14:27:42 2015 - [info] Current Alive Master: vdbsrv1(192.168.1.6:3306) Mon Apr 20 14:27:42 2015 - [info] Checking slave configurations.. Mon Apr 20 14:27:42 2015 - [info]  read_only=1 is not set on slave vdbsrv2(192.168.1.7:3306). Mon Apr 20 14:27:42 2015 - [info] Checking replication filtering settings.. Mon Apr 20 14:27:42 2015 - [info]  binlog_do_db= , binlog_ignore_db= Mon Apr 20 14:27:42 2015 - [info]  Replication filtering check ok. Mon Apr 20 14:27:42 2015 - [info] GTID (with auto-pos) is not supported Mon Apr 20 14:27:42 2015 - [info] Starting SSH connection tests.. Mon Apr 20 14:27:43 2015 - [info] All SSH connection tests passed successfully. Mon Apr 20 14:27:43 2015 - [info] Checking MHA Node version.. Mon Apr 20 14:27:44 2015 - [info]  Version check ok. Mon Apr 20 14:27:44 2015 - [info] Checking SSH publickey authentication settings on the current master.. Mon Apr 20 14:27:44 2015 - [info] HealthCheck: SSH to vdbsrv1 is reachable. Mon Apr 20 14:27:44 2015 - [info] Master MHA Node version is 0.56. Mon Apr 20 14:27:44 2015 - [info] Checking recovery script configurations on vdbsrv1(192.168.1.6:3306).. Mon Apr 20 14:27:44 2015 - [info]   Executing command: save_binary_logs --command=test --start_pos=4 --binlog_dir=/data/mysqldata      --output_file=/var/tmp/save_binary_logs_test --manager_version=0.56 --start_file=mysql-bin.000020 Mon Apr 20 14:27:44 2015 - [info]   Connecting to root@192.168.1.6(vdbsrv1:22)..   Creating /var/tmp if not exists..    ok.   Checking output directory is accessible or not..    ok.   Binlog found at /data/mysqldata, up to mysql-bin.000020 Mon Apr 20 14:27:44 2015 - [info] Binlog setting check done. Mon Apr 20 14:27:44 2015 - [info] Checking SSH publickey authentication and checking recovery script configurations on all alive slave servers.. Mon Apr 20 14:27:44 2015 - [info]   Executing command : apply_diff_relay_logs --command=test --slave_user='mha' --slave_host=vdbsrv2  --slave_ip=192.168.1.7 --slave_port=3306 --workdir=/var/tmp --target_version=5.6.22-log --manager_version=0.56  --relay_log_info=/data/mysqldata/relay-log.info  --relay_dir=/data/mysqldata/  --slave_pass=xxx Mon Apr 20 14:27:44 2015 - [info]   Connecting to root@192.168.1.7(vdbsrv2:22)..   Checking slave recovery environment settings..     Opening /data/mysqldata/relay-log.info ... ok.     Relay log found at /data/mysqldata, up to vdbsrv2-relay-bin.000002     Temporary relay log file is /data/mysqldata/vdbsrv2-relay-bin.000002     Testing mysql connection and privileges.. done.     Testing mysqlbinlog output.. done.     Cleaning up test file(s).. done. Mon Apr 20 14:27:45 2015 - [info]   Executing command : apply_diff_relay_logs --command=test --slave_user='mha'   --slave_host=vdbsrv3 --slave_ip=192.168.1.8 --slave_port=3306 --workdir=/var/tmp --target_version=5.6.22-log   --manager_version=0.56 --relay_log_info=/data/mysqldata/relay-log.info  --relay_dir=/data/mysqldata/  --slave_pass=xxx Mon Apr 20 14:27:45 2015 - [info]   Connecting to root@192.168.1.8(vdbsrv3:22)..   Checking slave recovery environment settings..     Opening /data/mysqldata/relay-log.info ... ok.     Relay log found at /data/mysqldata, up to vdbsrv3-relay-bin.000002     Temporary relay log file is /data/mysqldata/vdbsrv3-relay-bin.000002     Testing mysql connection and privileges.. done.     Testing mysqlbinlog output.. done.     Cleaning up test file(s).. done. Mon Apr 20 14:27:45 2015 - [info] Slaves settings check done. Mon Apr 20 14:27:45 2015 - [info] vdbsrv1(192.168.1.6:3306) (current master)  +--vdbsrv2(192.168.1.7:3306)  +--vdbsrv3(192.168.1.8:3306)

Mon Apr 20 14:27:45 2015 - [info] Checking master_ip_failover_script status: Mon Apr 20 14:27:45 2015 - [info]   /tmp/master_ip_failover --command=status --ssh_user=root --orig_master_host=vdbsrv1   --orig_master_ip=192.168.1.6 --orig_master_port=3306

IN SCRIPT TEST====/sbin/ifconfig eth0:0 down==/sbin/ifconfig eth0:0 192.168.1.13/24===

Checking the Status of the script.. OK Mon Apr 20 14:27:45 2015 - [info]  OK. Mon Apr 20 14:27:45 2015 - [warning] shutdown_script is not defined. Mon Apr 20 14:27:45 2015 - [info] Set master ping interval 1 seconds. Mon Apr 20 14:27:45 2015 - [warning] secondary_check_script is not defined. It is highly recommended setting it to check master            reachability from two or more routes. Mon Apr 20 14:27:45 2015 - [info] Starting ping health check on vdbsrv1(192.168.1.6:3306).. Mon Apr 20 14:27:45 2015 - [info] Ping(SELECT) succeeded, waiting until MySQL doesn't respond.. Mon Apr 20 14:30:19 2015 - [warning] Got error on MySQL select ping: 2013 (Lost connection to MySQL server during query) ###侦测到错误 Mon Apr 20 14:30:19 2015 - [info] Executing SSH check script: save_binary_logs --command=test --start_pos=4 --binlog_dir=/data/mysqldata  --output_file=/var/tmp/save_binary_logs_test --manager_version=0.56 --binlog_prefix=mysql-bin Mon Apr 20 14:30:19 2015 - [info] HealthCheck: SSH to vdbsrv1 is reachable. Mon Apr 20 14:30:20 2015 - [warning] Got error on MySQL connect: 2003 (Can't connect to MySQL server on '192.168.1.6' (111)) Mon Apr 20 14:30:20 2015 - [warning] Connection failed 2 time(s).. Mon Apr 20 14:30:21 2015 - [warning] Got error on MySQL connect: 2003 (Can't connect to MySQL server on '192.168.1.6' (111)) Mon Apr 20 14:30:21 2015 - [warning] Connection failed 3 time(s).. Mon Apr 20 14:30:22 2015 - [warning] Got error on MySQL connect: 2003 (Can't connect to MySQL server on '192.168.1.6' (111)) Mon Apr 20 14:30:22 2015 - [warning] Connection failed 4 time(s).. Mon Apr 20 14:30:22 2015 - [warning] Master is not reachable from health checker! Mon Apr 20 14:30:22 2015 - [warning] Master vdbsrv1(192.168.1.6:3306) is not reachable! Mon Apr 20 14:30:22 2015 - [warning] SSH is reachable. Mon Apr 20 14:30:22 2015 - [info] Connecting to a master server failed. Reading configuration file /etc/masterha_default.cnf and   /etc/masterha/app1.cnf again, and trying to connect to all servers to check server status.. Mon Apr 20 14:30:22 2015 - [warning] Global configuration file /etc/masterha_default.cnf not found. Skipping. Mon Apr 20 14:30:22 2015 - [info] Reading application default configuration from /etc/masterha/app1.cnf.. Mon Apr 20 14:30:22 2015 - [info] Reading server configuration from /etc/masterha/app1.cnf.. Mon Apr 20 14:30:22 2015 - [info] GTID failover mode = 0 Mon Apr 20 14:30:22 2015 - [info] Dead Servers: Mon Apr 20 14:30:22 2015 - [info]   vdbsrv1(192.168.1.6:3306) Mon Apr 20 14:30:22 2015 - [info] Alive Servers: Mon Apr 20 14:30:22 2015 - [info]   vdbsrv2(192.168.1.7:3306) Mon Apr 20 14:30:22 2015 - [info]   vdbsrv3(192.168.1.8:3306) Mon Apr 20 14:30:22 2015 - [info] Alive Slaves: Mon Apr 20 14:30:22 2015 - [info]   vdbsrv2(192.168.1.7:3306)  Version=5.6.22-log (oldest major version between slaves) log-bin:enabled Mon Apr 20 14:30:22 2015 - [info]     Replicating from 192.168.1.6(192.168.1.6:3306) Mon Apr 20 14:30:22 2015 - [info]   vdbsrv3(192.168.1.8:3306)  Version=5.6.22-log (oldest major version between slaves) log-bin:enabled Mon Apr 20 14:30:22 2015 - [info]     Replicating from 192.168.1.6(192.168.1.6:3306) Mon Apr 20 14:30:22 2015 - [info] Checking slave configurations.. Mon Apr 20 14:30:22 2015 - [info]  read_only=1 is not set on slave vdbsrv2(192.168.1.7:3306). Mon Apr 20 14:30:22 2015 - [info] Checking replication filtering settings.. Mon Apr 20 14:30:22 2015 - [info]  Replication filtering check ok. Mon Apr 20 14:30:22 2015 - [info] Master is down! Mon Apr 20 14:30:22 2015 - [info] Terminating monitoring script. Mon Apr 20 14:30:22 2015 - [info] Got exit code 20 (Master dead). Mon Apr 20 14:30:22 2015 - [info] MHA::MasterFailover version 0.56. Mon Apr 20 14:30:22 2015 - [info] Starting master failover. Mon Apr 20 14:30:22 2015 - [info] Mon Apr 20 14:30:22 2015 - [info] * Phase 1: Configuration Check Phase.. Mon Apr 20 14:30:22 2015 - [info] Mon Apr 20 14:30:22 2015 - [info] GTID failover mode = 0 Mon Apr 20 14:30:22 2015 - [info] Dead Servers: Mon Apr 20 14:30:22 2015 - [info]   vdbsrv1(192.168.1.6:3306) Mon Apr 20 14:30:22 2015 - [info] Checking master reachability via MySQL(double check)... Mon Apr 20 14:30:22 2015 - [info]  ok. Mon Apr 20 14:30:22 2015 - [info] Alive Servers: Mon Apr 20 14:30:22 2015 - [info]   vdbsrv2(192.168.1.7:3306) Mon Apr 20 14:30:22 2015 - [info]   vdbsrv3(192.168.1.8:3306) Mon Apr 20 14:30:22 2015 - [info] Alive Slaves: Mon Apr 20 14:30:22 2015 - [info]   vdbsrv2(192.168.1.7:3306)  Version=5.6.22-log (oldest major version between slaves) log-bin:enabled Mon Apr 20 14:30:22 2015 - [info]     Replicating from 192.168.1.6(192.168.1.6:3306) Mon Apr 20 14:30:22 2015 - [info]   vdbsrv3(192.168.1.8:3306)  Version=5.6.22-log (oldest major version between slaves) log-bin:enabled Mon Apr 20 14:30:22 2015 - [info]     Replicating from 192.168.1.6(192.168.1.6:3306) Mon Apr 20 14:30:22 2015 - [info] Starting Non-GTID based failover. Mon Apr 20 14:30:22 2015 - [info] Mon Apr 20 14:30:22 2015 - [info] ** Phase 1: Configuration Check Phase completed. Mon Apr 20 14:30:22 2015 - [info] Mon Apr 20 14:30:22 2015 - [info] * Phase 2: Dead Master Shutdown Phase.. ###隔离master server Mon Apr 20 14:30:22 2015 - [info] Mon Apr 20 14:30:22 2015 - [info] Forcing shutdown so that applications never connect to the current master.. Mon Apr 20 14:30:22 2015 - [info] Executing master IP deactivation script: Mon Apr 20 14:30:22 2015 - [info]   /tmp/master_ip_failover --orig_master_host=vdbsrv1 --orig_master_ip=192.168.1.6 --orig_master_port=3306   --command=stopssh --ssh_user=root  IN SCRIPT TEST====/sbin/ifconfig eth0:0 down==/sbin/ifconfig eth0:0 192.168.1.13/24===

Disabling the VIP on old master: vdbsrv1 Mon Apr 20 14:30:22 2015 - [info]  done. Mon Apr 20 14:30:22 2015 - [warning] shutdown_script is not set. Skipping explicit shutting down of the dead master. Mon Apr 20 14:30:22 2015 - [info] * Phase 2: Dead Master Shutdown Phase completed. Mon Apr 20 14:30:22 2015 - [info] Mon Apr 20 14:30:22 2015 - [info] * Phase 3: Master Recovery Phase.. Mon Apr 20 14:30:22 2015 - [info] Mon Apr 20 14:30:22 2015 - [info] * Phase 3.1: Getting Latest Slaves Phase.. Mon Apr 20 14:30:22 2015 - [info] Mon Apr 20 14:30:22 2015 - [info] The latest binary log file/position on all slaves is mysql-bin.000020:315514388 Mon Apr 20 14:30:22 2015 - [info] Latest slaves (Slaves that received relay log files to the latest): Mon Apr 20 14:30:22 2015 - [info]   vdbsrv2(192.168.1.7:3306)  Version=5.6.22-log (oldest major version between slaves) log-bin:enabled Mon Apr 20 14:30:22 2015 - [info]     Replicating from 192.168.1.6(192.168.1.6:3306) Mon Apr 20 14:30:22 2015 - [info] The oldest binary log file/position on all slaves is mysql-bin.000020:313962621 Mon Apr 20 14:30:22 2015 - [info] Oldest slaves: Mon Apr 20 14:30:22 2015 - [info]   vdbsrv3(192.168.1.8:3306)  Version=5.6.22-log (oldest major version between slaves) log-bin:enabled Mon Apr 20 14:30:22 2015 - [info]     Replicating from 192.168.1.6(192.168.1.6:3306) Mon Apr 20 14:30:22 2015 - [info] Mon Apr 20 14:30:22 2015 - [info] * Phase 3.2: Saving Dead Master's Binlog Phase.. Mon Apr 20 14:30:22 2015 - [info] Mon Apr 20 14:30:23 2015 - [info] Fetching dead master's binary logs.. ###从dead master提取binlog Mon Apr 20 14:30:23 2015 - [info] Executing command on the dead master vdbsrv1(192.168.1.6:3306): save_binary_logs --command=save  --start_file=mysql-bin.000020  --start_pos=315514388 --binlog_dir=/data/mysqldata  --output_file=/var/tmp/saved_master_binlog_from_vdbsrv1_3306_20150420143022.binlog --handle_raw_binlog=1 --disable_log_bin=0  --manager_version=0.56   Creating /var/tmp if not exists..    ok.  Concat binary/relay logs from mysql-bin.000020 pos 315514388 to mysql-bin.000020 EOF into    /var/tmp/saved_master_binlog_from_vdbsrv1_3306_20150420143022.binlog ..  Binlog Checksum enabled   Dumping binlog format description event, from position 0 to 120.. ok. Dumping effective binlog data from /data/mysqldata/mysql-bin.000020 position 315514388 to tail(315514411).. ok.  Binlog Checksum enabled  Concat succeeded. Mon Apr 20 14:30:23 2015 - [info] scp from root@192.168.1.6:/var/tmp/saved_master_binlog_from_vdbsrv1_3306_20150420143022.binlog to   local:/var/log/masterha/app1/saved_master_binlog_from_vdbsrv1_3306_20150420143022.binlog succeeded. ###复制dump的binlog到监控节点 Mon Apr 20 14:30:23 2015 - [info] HealthCheck: SSH to vdbsrv2 is reachable. Mon Apr 20 14:30:24 2015 - [info] HealthCheck: SSH to vdbsrv3 is reachable. Mon Apr 20 14:30:24 2015 - [info] Mon Apr 20 14:30:24 2015 - [info] * Phase 3.3: Determining New Master Phase.. Mon Apr 20 14:30:24 2015 - [info] Mon Apr 20 14:30:24 2015 - [info] Finding the latest slave that has all relay logs for recovering other slaves.. ###寻找最近的slave中继日志 Mon Apr 20 14:30:24 2015 - [info] Checking whether vdbsrv2 has relay logs from the oldest position..             ###用于恢复其他slave Mon Apr 20 14:30:24 2015 - [info] Executing command: apply_diff_relay_logs --command=find --latest_mlf=mysql-bin.000020 --latest_rmlp=315514388   --target_mlf=mysql-bin.000020 --target_rmlp=313962621 --server_id=1001 --workdir=/var/tmp --timestamp=20150420143022   --manager_version=0.56 --relay_log_info=/data/mysqldata/relay-log.info  --relay_dir=/data/mysqldata/      Opening /data/mysqldata/relay-log.info ... ok.     Relay log found at /data/mysqldata, up to vdbsrv2-relay-bin.000003  Fast relay log position search succeeded.  Target relay log file/position found. start_file:vdbsrv2-relay-bin.000003, start_pos:6265486. Target relay log FOUND! Mon Apr 20 14:30:24 2015 - [info] OK. vdbsrv2 has all relay logs. Mon Apr 20 14:30:24 2015 - [info] Searching new master from slaves..  ###寻找及决定新的master Mon Apr 20 14:30:24 2015 - [info]  Candidate masters from the configuration file: Mon Apr 20 14:30:24 2015 - [info]  Non-candidate masters: Mon Apr 20 14:30:24 2015 - [info] New master is vdbsrv2(192.168.1.7:3306) Mon Apr 20 14:30:24 2015 - [info] Starting master failover..          ###执行failover Mon Apr 20 14:30:24 2015 - [info] From: vdbsrv1(192.168.1.6:3306) (current master)  +--vdbsrv2(192.168.1.7:3306)  +--vdbsrv3(192.168.1.8:3306)

To: vdbsrv2(192.168.1.7:3306) (new master)  +--vdbsrv3(192.168.1.8:3306) Mon Apr 20 14:30:24 2015 - [info] Mon Apr 20 14:30:24 2015 - [info] * Phase 3.3: New Master Diff Log Generation Phase.. Mon Apr 20 14:30:24 2015 - [info] Mon Apr 20 14:30:24 2015 - [info]  This server has all relay logs. No need to generate diff files from the latest slave. Mon Apr 20 14:30:24 2015 - [info] Sending binlog.. Mon Apr 20 14:30:25 2015 - [info] scp from local:/var/log/masterha/app1/saved_master_binlog_from_vdbsrv1_3306_20150420143022.binlog to   root@vdbsrv2:/var/tmp/saved_master_binlog_from_vdbsrv1_3306_20150420143022.binlog succeeded. Mon Apr 20 14:30:25 2015 - [info] Mon Apr 20 14:30:25 2015 - [info] * Phase 3.4: Master Log Apply Phase.. Mon Apr 20 14:30:25 2015 - [info] Mon Apr 20 14:30:25 2015 - [info] *NOTICE: If any error happens from this phase, manual recovery is needed. Mon Apr 20 14:30:25 2015 - [info] Starting recovery on vdbsrv2(192.168.1.7:3306).. Mon Apr 20 14:30:25 2015 - [info]  Generating diffs succeeded. Mon Apr 20 14:30:25 2015 - [info] Waiting until all relay logs are applied. Mon Apr 20 14:30:36 2015 - [info]  done. Mon Apr 20 14:30:36 2015 - [info] Getting slave status.. Mon Apr 20 14:30:36 2015 - [info] This slave(vdbsrv2)'s Exec_Master_Log_Pos equals to Read_Master_Log_Pos(mysql-bin.000020:315514388).   No need to recover from Exec_Master_Log_Pos. Mon Apr 20 14:30:36 2015 - [info] Connecting to the target slave host vdbsrv2, running recover script..  ###基于新主库Apply差量日志 Mon Apr 20 14:30:36 2015 - [info] Executing command: apply_diff_relay_logs --command=apply --slave_user='mha' --slave_host=vdbsrv2   --slave_ip=192.168.1.7  --slave_port=3306 --apply_files=/var/tmp/saved_master_binlog_from_vdbsrv1_3306_20150420143022.binlog   --workdir=/var/tmp --target_version=5.6.22-log --timestamp=20150420143022 --handle_raw_binlog=1 --disable_log_bin=0   --manager_version=0.56 --slave_pass=xxx Mon Apr 20 14:30:36 2015 - [info] Applying differential binary/relay log files /var/tmp/saved_master_binlog_from_vdbsrv1_3306_20150420143022.binlog on vdbsrv2:3306.   This may take long time... Applying log files succeeded. Mon Apr 20 14:30:36 2015 - [info]  All relay logs were successfully applied. Mon Apr 20 14:30:36 2015 - [info] Getting new master's binlog name and position.. Mon Apr 20 14:30:36 2015 - [info]  mysql-bin.000011:241926689 Mon Apr 20 14:30:36 2015 - [info]  All other slaves should start replication from here. Statement should be: CHANGE MASTER TO   MASTER_HOST='vdbsrv2 or 192.168.1.7', MASTER_PORT=3306, MASTER_LOG_FILE='mysql-bin.000011', MASTER_LOG_POS=241926689, MASTER_USER='repl',   MASTER_PASSWORD='xxx'; Mon Apr 20 14:30:36 2015 - [info] Executing master IP activate script:  ###IP漂移 Mon Apr 20 14:30:36 2015 - [info]   /tmp/master_ip_failover --command=start --ssh_user=root --orig_master_host=vdbsrv1 --orig_master_ip=192.168.1.6   --orig_master_port=3306 --new_master_host=vdbsrv2 --new_master_ip=192.168.1.7 --new_master_port=3306 --new_master_user='mha'   --new_master_password='xxx'  Unknown option: new_master_user Unknown option: new_master_password

IN SCRIPT TEST====/sbin/ifconfig eth0:0 down==/sbin/ifconfig eth0:0 192.168.1.13/24===

Enabling the VIP - 192.168.1.13/24 on the new master - vdbsrv2 Mon Apr 20 14:30:36 2015 - [info]  OK. Mon Apr 20 14:30:36 2015 - [info] ** Finished master recovery successfully. Mon Apr 20 14:30:36 2015 - [info] * Phase 3: Master Recovery Phase completed. Mon Apr 20 14:30:36 2015 - [info] Mon Apr 20 14:30:36 2015 - [info] * Phase 4: Slaves Recovery Phase.. Mon Apr 20 14:30:36 2015 - [info] Mon Apr 20 14:30:36 2015 - [info] * Phase 4.1: Starting Parallel Slave Diff Log Generation Phase.. Mon Apr 20 14:30:36 2015 - [info] Mon Apr 20 14:30:36 2015 - [info] -- Slave diff file generation on host vdbsrv3(192.168.1.8:3306) started, pid: 7726.   Check tmp log /var/log/masterha/app1/vdbsrv3_3306_20150420143022.log if it takes time.. Mon Apr 20 14:30:37 2015 - [info] Mon Apr 20 14:30:37 2015 - [info] Log messages from vdbsrv3 ... Mon Apr 20 14:30:37 2015 - [info] Mon Apr 20 14:30:36 2015 - [info] Server vdbsrv3 received relay logs up to: mysql-bin.000020:313962621 Mon Apr 20 14:30:36 2015 - [info] Need to get diffs from the latest slave(vdbsrv2) up to: mysql-bin.000020:315514388   (using the latest slave's relay logs) ###此时vdbsrv3需要从vdbsrv2获取差量日志 Mon Apr 20 14:30:36 2015 - [info] Connecting to the latest slave host vdbsrv2, generating diff relay log files.. Mon Apr 20 14:30:36 2015 - [info] Executing command: apply_diff_relay_logs --command=generate_and_send --scp_user=root --scp_host=192.168.1.8   --latest_mlf=mysql-bin.000020 --latest_rmlp=315514388 --target_mlf=mysql-bin.000020 --target_rmlp=313962621 --server_id=1001   --diff_file_readtolatest=/var/tmp/relay_from_read_to_latest_vdbsrv3_3306_20150420143022.binlog --workdir=/var/tmp --timestamp=20150420143022   --handle_raw_binlog=1 --disable_log_bin=0 --manager_version=0.56 --relay_log_info=/data/mysqldata/relay-log.info --relay_dir=/data/mysqldata/ Mon Apr 20 14:30:37 2015 - [info]     Opening /data/mysqldata/relay-log.info ... ok.     Relay log found at /data/mysqldata, up to vdbsrv2-relay-bin.000003  Fast relay log position search succeeded.  Target relay log file/position found. start_file:vdbsrv2-relay-bin.000003, start_pos:6265486.  Concat binary/relay logs from vdbsrv2-relay-bin.000003 pos 6265486 to vdbsrv2-relay-bin.000003 EOF into    /var/tmp/relay_from_read_to_latest_vdbsrv3_3306_20150420143022.binlog ..  ###注，此时是从vdbsrv2中继日志获取  Binlog Checksum enabled  Binlog Checksum enabled   Dumping binlog format description event, from position 0 to 283.. ok.   Dumping effective binlog data from /data/mysqldata/vdbsrv2-relay-bin.000003 position 6265486 to tail(7817253).. ok.  Binlog Checksum enabled  Binlog Checksum enabled  Concat succeeded.  Generating diff relay log succeeded. Saved at /var/tmp/relay_from_read_to_latest_vdbsrv3_3306_20150420143022.binlog .  scp vdbsrv2:/var/tmp/relay_from_read_to_latest_vdbsrv3_3306_20150420143022.binlog to root@192.168.1.8(22) succeeded. Mon Apr 20 14:30:37 2015 - [info]  Generating diff files succeeded. Mon Apr 20 14:30:37 2015 - [info] End of log messages from vdbsrv3. Mon Apr 20 14:30:37 2015 - [info] -- Slave diff log generation on host vdbsrv3(192.168.1.8:3306) succeeded. Mon Apr 20 14:30:37 2015 - [info] Generating relay diff files from the latest slave succeeded. Mon Apr 20 14:30:37 2015 - [info] Mon Apr 20 14:30:37 2015 - [info] * Phase 4.2: Starting Parallel Slave Log Apply Phase.. Mon Apr 20 14:30:37 2015 - [info] Mon Apr 20 14:30:37 2015 - [info] -- Slave recovery on host vdbsrv3(192.168.1.8:3306) started, pid: 7735.   Check tmp log /var/log/masterha/app1/vdbsrv3_3306_20150420143022.log if it takes time.. Mon Apr 20 14:30:43 2015 - [info] Mon Apr 20 14:30:43 2015 - [info] Log messages from vdbsrv3 ... Mon Apr 20 14:30:43 2015 - [info] Mon Apr 20 14:30:37 2015 - [info] Sending binlog..  ###这部分则是在原master宕机后未发送的binlog部分 Mon Apr 20 14:30:38 2015 - [info] scp from local:/var/log/masterha/app1/saved_master_binlog_from_vdbsrv1_3306_20150420143022.binlog to   root@vdbsrv3:/var/tmp/saved_master_binlog_from_vdbsrv1_3306_20150420143022.binlog succeeded. Mon Apr 20 14:30:38 2015 - [info] Starting recovery on vdbsrv3(192.168.1.8:3306).. Mon Apr 20 14:30:38 2015 - [info]  Generating diffs succeeded. Mon Apr 20 14:30:38 2015 - [info] Waiting until all relay logs are applied. Mon Apr 20 14:30:38 2015 - [info]  done. Mon Apr 20 14:30:38 2015 - [info] Getting slave status.. Mon Apr 20 14:30:38 2015 - [info] This slave(vdbsrv3)'s Exec_Master_Log_Pos equals to Read_Master_Log_Pos(mysql-bin.000020:313962621).   No need to recover from Exec_Master_Log_Pos. Mon Apr 20 14:30:38 2015 - [info] Connecting to the target slave host vdbsrv3, running recover script.. Mon Apr 20 14:30:38 2015 - [info] Executing command: apply_diff_relay_logs --command=apply --slave_user='mha' --slave_host=vdbsrv3   --slave_ip=192.168.1.8  --slave_port=3306 --apply_files=/var/tmp/relay_from_read_to_latest_vdbsrv3_3306_20150420143022.binlog,   /var/tmp/saved_master_binlog_from_vdbsrv1_3306_20150420143022.binlog --workdir=/var/tmp --target_version=5.6.22-log   --timestamp=20150420143022 --handle_raw_binlog=1 --disable_log_bin=0 --manager_version=0.56 --slave_pass=xxx Mon Apr 20 14:30:43 2015 - [info]  Concat all apply files to /var/tmp/total_binlog_for_vdbsrv3_3306.20150420143022.binlog ..  Copying the first binlog file /var/tmp/relay_from_read_to_latest_vdbsrv3_3306_20150420143022.binlog to    /var/tmp/total_binlog_for_vdbsrv3_3306.20150420143022.binlog.. ok.   Dumping binlog head events (rotate events), skipping format description events from   /var/tmp/saved_master_binlog_from_vdbsrv1_3306_20150420143022.binlog..  Binlog Checksum enabled dumped up to pos 120. ok.  /var/tmp/saved_master_binlog_from_vdbsrv1_3306_20150420143022.binlog has effective binlog events from pos 120.   Dumping effective binlog data from /var/tmp/saved_master_binlog_from_vdbsrv1_3306_20150420143022.binlog position 120 to tail(143).. ok.  Concat succeeded. All apply target binary logs are concatinated at /var/tmp/total_binlog_for_vdbsrv3_3306.20150420143022.binlog . Applying differential binary/relay log files /var/tmp/relay_from_read_to_latest_vdbsrv3_3306_20150420143022.binlog,   /var/tmp/saved_master_binlog_from_vdbsrv1_3306_20150420143022.binlog on vdbsrv3:3306. This may take long time... Applying log files succeeded. Mon Apr 20 14:30:43 2015 - [info]  All relay logs were successfully applied. Mon Apr 20 14:30:43 2015 - [info]  Resetting slave vdbsrv3(192.168.1.8:3306) and starting replication from the new master vdbsrv2(192.168.1.7:3306).. Mon Apr 20 14:30:43 2015 - [info]  Executed CHANGE MASTER. Mon Apr 20 14:30:43 2015 - [info]  Slave started. Mon Apr 20 14:30:43 2015 - [info] End of log messages from vdbsrv3. Mon Apr 20 14:30:43 2015 - [info] -- Slave recovery on host vdbsrv3(192.168.1.8:3306) succeeded. Mon Apr 20 14:30:43 2015 - [info] All new slave servers recovered successfully. Mon Apr 20 14:30:43 2015 - [info] Mon Apr 20 14:30:43 2015 - [info] * Phase 5: New master cleanup phase.. Mon Apr 20 14:30:43 2015 - [info] Mon Apr 20 14:30:43 2015 - [info] Resetting slave info on the new master.. Mon Apr 20 14:30:43 2015 - [info]  vdbsrv2: Resetting slave info succeeded. Mon Apr 20 14:30:43 2015 - [info] Master failover to vdbsrv2(192.168.1.7:3306) completed successfully. Mon Apr 20 14:30:43 2015 - [info]

----- Failover Report -----

app1: MySQL Master failover vdbsrv1(192.168.1.6:3306) to vdbsrv2(192.168.1.7:3306) succeeded

Master vdbsrv1(192.168.1.6:3306) is down!   ###整个failover总时间14:30:43-14:30:19=24s

Check MHA Manager logs at vdbsrv4:/var/log/masterha/app1/manager.log for details.

Started automated(non-interactive) failover. Invalidated master IP address on vdbsrv1(192.168.1.6:3306) The latest slave vdbsrv2(192.168.1.7:3306) has all relay logs for recovery. Selected vdbsrv2(192.168.1.7:3306) as a new master. vdbsrv2(192.168.1.7:3306): OK: Applying all logs succeeded. vdbsrv2(192.168.1.7:3306): OK: Activated master IP address. vdbsrv3(192.168.1.8:3306): Generating differential relay logs up to vdbsrv2(192.168.1.7:3306)succeeded. Generating relay diff files from the latest slave succeeded. vdbsrv3(192.168.1.8:3306): OK: Applying all logs succeeded. Slave started, replicating from vdbsrv2(192.168.1.7:3306) vdbsrv2(192.168.1.7:3306): Resetting slave info succeeded. Master failover to vdbsrv2(192.168.1.7:3306) completed successfully.