MHA masterha_check_repl 检测过程

    MHA部署及配置是否OK，我们可以借助于MHA自带的masterha_check_ssh以及masterha_check_repl脚本来检测。masterha_check_repl检测是保证MHA成功切换的重要一步。本文主要描述了masterha_check_repl这个检测脚本到底做了些什么事情。有助于更好的理解MHA的相关原理及过程等。

1、当前的主从环境 [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

###os环境 [root@vdbsrv4 ~]# more /etc/issue CentOS release 5.9 (Final) Kernel \r on an \m

###mysql环境 [root@vdbsrv4 ~]# mysql -e "show variables like 'version'" +---------------+------------+ | Variable_name | Value      | +---------------+------------+ | version       | 5.6.22-log | +---------------+------------+

[root@vdbsrv4 ~]# masterha_manager --version masterha_manager version 0.56.

2、当前的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

3、masterha_check_repl检测步骤 a、读取配置文件 b、检测配置文件中列出的mysql服务器(识别主从) c、检测从库配置信息     read_only参数     relay_log_purge参数     复制过滤规则 d、ssh等效性验证  e、检测主库保存binlog脚本(save_binary_logs) ，主要是用于在master死掉后从binlog读取日志 f、检测各从库能否apply差量binlog(apply_diff_relay_logs) g、检测IP切换，如果有部署脚本

4、实际检测过程  [root@vdbsrv4 ~]# masterha_check_repl --conf=/etc/masterha/app1.cnf Fri Apr 17 18:48:41 2015 - [warning] Global configuration file /etc/masterha_default.cnf not found. Skipping. Fri Apr 17 18:48:41 2015 - [info] Reading application default configuration from /etc/masterha/app1.cnf.. Fri Apr 17 18:48:41 2015 - [info] Reading server configuration from /etc/masterha/app1.cnf.. ###读取配置文件 Fri Apr 17 18:48:41 2015 - [info] MHA::MasterMonitor version 0.56. Fri Apr 17 18:48:42 2015 - [info] GTID failover mode = 0 Fri Apr 17 18:48:42 2015 - [info] Dead Servers:   ###开始检测配置文件中列出的mysql服务器(识别主从) Fri Apr 17 18:48:42 2015 - [info] Alive Servers: Fri Apr 17 18:48:42 2015 - [info]   vdbsrv1(192.168.1.6:3306) Fri Apr 17 18:48:42 2015 - [info]   vdbsrv2(192.168.1.7:3306) Fri Apr 17 18:48:42 2015 - [info]   vdbsrv3(192.168.1.8:3306) Fri Apr 17 18:48:42 2015 - [info] Alive Slaves: Fri Apr 17 18:48:42 2015 - [info]   vdbsrv2(192.168.1.7:3306)  Version=5.6.22-log (oldest major version between slaves) log-bin:enabled Fri Apr 17 18:48:42 2015 - [info]     Replicating from 192.168.1.6(192.168.1.6:3306) Fri Apr 17 18:48:42 2015 - [info]   vdbsrv3(192.168.1.8:3306)  Version=5.6.22-log (oldest major version between slaves) log-bin:enabled Fri Apr 17 18:48:42 2015 - [info]     Replicating from 192.168.1.6(192.168.1.6:3306) Fri Apr 17 18:48:42 2015 - [info] Current Alive Master: vdbsrv1(192.168.1.6:3306) Fri Apr 17 18:48:42 2015 - [info] Checking slave configurations..  ###检测从库配置信息 Fri Apr 17 18:48:42 2015 - [info]  read_only=1 is not set on slave vdbsrv2(192.168.1.7:3306). Fri Apr 17 18:48:42 2015 - [warning]  relay_log_purge=0 is not set on slave vdbsrv2(192.168.1.7:3306). Fri Apr 17 18:48:42 2015 - [info]  read_only=1 is not set on slave vdbsrv3(192.168.1.8:3306). Fri Apr 17 18:48:42 2015 - [warning]  relay_log_purge=0 is not set on slave vdbsrv3(192.168.1.8:3306). Fri Apr 17 18:48:42 2015 - [info] Checking replication filtering settings..    ###检测复制过滤规则 Fri Apr 17 18:48:42 2015 - [info]  binlog_do_db= , binlog_ignore_db= Fri Apr 17 18:48:42 2015 - [info]  Replication filtering check ok. Fri Apr 17 18:48:42 2015 - [info] GTID (with auto-pos) is not supported Fri Apr 17 18:48:42 2015 - [info] Starting SSH connection tests..              ###ssh等效性验证 Fri Apr 17 18:48:43 2015 - [info] All SSH connection tests passed successfully. Fri Apr 17 18:48:43 2015 - [info] Checking MHA Node version.. Fri Apr 17 18:48:44 2015 - [info]  Version check ok. Fri Apr 17 18:48:44 2015 - [info] Checking SSH publickey authentication settings on the current master.. Fri Apr 17 18:48:44 2015 - [info] HealthCheck: SSH to vdbsrv1 is reachable. Fri Apr 17 18:48:44 2015 - [info] Master MHA Node version is 0.56. Fri Apr 17 18:48:44 2015 - [info] Checking recovery script configurations on vdbsrv1(192.168.1.6:3306)..###检测主库保存binlog脚本 Fri Apr 17 18:48:44 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.000012 Fri Apr 17 18:48:44 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.000012 Fri Apr 17 18:48:44 2015 - [info] Binlog setting check done.  ###以下部分检测各从库能否apply差量binlog Fri Apr 17 18:48:44 2015 - [info] Checking SSH publickey authentication and checking recovery script configurations on all alive slave servers.. Fri Apr 17 18:48:44 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 Fri Apr 17 18:48:44 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.000006     Temporary relay log file is /data/mysqldata/vdbsrv2-relay-bin.000006     Testing mysql connection and privileges.. done.  #Author : Leshami     Testing mysqlbinlog output.. done.               #Blog   : http://blog.csdn.net/leshami     Cleaning up test file(s).. done. Fri Apr 17 18:48:44 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 Fri Apr 17 18:48:44 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.000006     Temporary relay log file is /data/mysqldata/vdbsrv3-relay-bin.000006     Testing mysql connection and privileges.. done.     Testing mysqlbinlog output.. done.     Cleaning up test file(s).. done. Fri Apr 17 18:48:45 2015 - [info] Slaves settings check done. Fri Apr 17 18:48:45 2015 - [info] vdbsrv1(192.168.1.6:3306) (current master)  +--vdbsrv2(192.168.1.7:3306)  +--vdbsrv3(192.168.1.8:3306)

Fri Apr 17 18:48:45 2015 - [info] Checking replication health on vdbsrv2.. Fri Apr 17 18:48:45 2015 - [info]  ok. Fri Apr 17 18:48:45 2015 - [info] Checking replication health on vdbsrv3.. Fri Apr 17 18:48:45 2015 - [info]  ok. Fri Apr 17 18:48:45 2015 - [info] Checking master_ip_failover_script status:  ###检测IP切换 Fri Apr 17 18:48:45 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 Fri Apr 17 18:48:45 2015 - [info]  OK. Fri Apr 17 18:48:45 2015 - [warning] shutdown_script is not defined. Fri Apr 17 18:48:45 2015 - [info] Got exit code 0 (Not master dead).

MySQL Replication Health is OK.