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Mysql5.5部署MHA

發布時間：2023/12/31 数据库 36 豆豆

生活随笔收集整理的這篇文章主要介紹了 Mysql5.5部署MHA 小編覺得挺不錯的,現在分享給大家,幫大家做個參考.

MHA分管理節點和數據庫節點，數據庫節點由mysql主從或者主主從構成，當主庫掛掉后，管理節點會自動將從節點提升為主節點；管理節點的角色類似于oracle數據庫中的fast start failover中的observer，但mha上層可以通過keepalive部署VIP，程序連接數據庫使用VIP，從而實現后臺數據庫的故障切換透明化

MHA節點包含三個腳本，依賴perl模塊；
save_binary_logs:保存和復制當掉的主服務器二進制日志；
apply_diff_relay_logs:識別差異的relay log事件，并應用于其他salve服務器；
purge_relay_logs:清除relay log文件；
需要在所有mysql服務器上安裝MHA節點，MHA管理服務器也需要安裝。MHA管理節點模塊內部依賴MHA節點模塊；
MHA管理節點通過ssh連接管理mysql服務器和執行MHA節點腳本。MHA節點依賴perl的DBD::mysql模塊;

本文環境介紹，操作系統均為rhel5.4
主庫：192.168.123.13/dg53.yang.com
備庫：192.168.123.14/dg54.yang.com
管理節點：192.168.123.15/dg55.yang.com

在開始之前，請先配置好服務器間的時間同步和名稱解析

一:在數據庫節點安裝mha node

[root@dg53?~]#?rpm?-ivh?http://dl.fedoraproject.org/pub/epel/5/i386/epel-release-5-4.noarch.rpm ?

Retrieving?http://dl.fedoraproject.org/pub/epel/5/i386/epel-release-5-4.noarch.rpm ?

warning:?/var/tmp/rpm-xfer.yqwfYT:?Header?V3?DSA?signature:?NOKEY,?key?ID?217521f6 ?

Preparing...????????????????###########################################?[100%] ?

???1:epel-release???????????###########################################?[100%] ?

[root@dg53?~]#?ls?/etc/yum.repos.d/ ?

base.repo??epel.repo??epel-testing.repo??rhel-debuginfo.repo ?

[root@dg53?~]#?yum?-y?install?perl-DBD-MySQL??ncftp ?

[root@dg53?~]#??wget?http://mysql-master-ha.googlecode.com/files/mha4mysql-node-0.52.tar.gz?-P?/usr/local/src/tarbag/ ?

[root@dg53?~]#?cd?/usr/local/src/tarbag/ ?

[root@dg53?tarbag]#?tar?-zxvpf?mha4mysql-node-0.52.tar.gz?-C?../software/ ?

[root@dg53?tarbag]#?cd?../software/mha4mysql-node-0.52/ ?

[root@dg53?mha4mysql-node-0.52]#?perl?Makefile.PL? ?

[root@dg53?mha4mysql-node-0.52]#?make?&&?make?install?

二：管理節點
1：按照步驟一安裝mha node

2:安裝mha manager

[root@dg55?~]#?yum?-y?install?perl-Config-Tiny?perl-Params-Validate?perl-Log-Dispatch?perl-Parallel-ForkManager ?

[root@dg55?~]#?wget?http://mysql-master-ha.googlecode.com/files/mha4mysql-manager-0.52.tar.gz?-P?/usr/local/src/tarbag/ ?

[root@dg55?~]#?cd?/usr/local/src/tarbag/ ?

[root@dg55?tarbag]#?tar?-zxvpf?mha4mysql-manager-0.52.tar.gz?-C?../software/ ?

[root@dg55?tarbag]#?cd?../software/mha4mysql-manager-0.52/ ?

[root@dg55?mha4mysql-manager-0.52]#?perl?Makefile.PL ?

[root@dg55?mha4mysql-manager-0.52]#?make?&&?make?install?

3:編輯配置文件

[root@dg55?mha4mysql-manager-0.52]#?mkdir?/etc/masterha ?

[root@dg55?mha4mysql-manager-0.52]#?mkdir?-p?/masterha/app1 ?

[root@dg55?mha4mysql-manager-0.52]#?cp?samples/conf/*?/etc/masterha/ ?

[root@dg55?mha4mysql-manager-0.52]#?cat?/etc/masterha/app1.cnf? ?

[server?default] ?

manager_workdir=/masterha/app1 ?

manager_log=/masterha/app1/manager.log ?

user=root?

password=123456?

ssh_user=root?

repl_user=r_test?

repl_password=123456?

ping_interval=1?

shutdown_script=""?

#master_ip_failover_script="/usr/local/bin/master_ip_failover"?

master_ip_online_change_script=""?

report_script=""?

[server1] ?

hostname=192.168.123.13 ?

master_binlog_dir="/mydata"?

candidate_master=1?

[server2] ?

hostname=192.168.123.14 ?

master_binlog_dir="/mydata"?

candidate_master=1?

4:配置manager節點和node節點以及node節點間的ssh公鑰信任

[root@dg55?~]#?ssh-keygen?-t?rsa ?

[root@dg55?~]#?ssh-copy-id?-i?/root/.ssh/id_rsa.pub?root@192.168.123.13 ?

[root@dg55?~]#?ssh-copy-id?-i?/root/.ssh/id_rsa.pub?root@192.168.123.14 ?

[root@dg55?~]#?ssh?192.168.123.13?"ifconfig?|grep?'inet?addr'?|head?-1" ?

??????????inet?addr:192.168.123.13??Bcast:192.168.123.255??Mask:255.255.255.0 ?

[root@dg55?~]#?ssh?192.168.123.14?"ifconfig?|grep?'inet?addr'?|head?-1" ?

??????????inet?addr:192.168.123.14??Bcast:192.168.123.255??Mask:255.255.255.0?

5：測試ssh連接

[root@dg55?~]#?masterha_check_ssh?--conf=/etc/masterha/app1.cnf? ?

Wed?Jun??6?11:11:25?2012?-?[warning]?Global?configuration?file?/etc/masterha_default.cnf?not?found.?Skipping. ?

Wed?Jun??6?11:11:25?2012?-?[info]?Reading?application?default?configurations?from?/etc/masterha/app1.cnf.. ?

Wed?Jun??6?11:11:25?2012?-?[info]?Reading?server?configurations?from?/etc/masterha/app1.cnf.. ?

Wed?Jun??6?11:11:25?2012?-?[info]?Starting?SSH?connection?tests.. ?

Wed?Jun??6?11:11:25?2012?-?[debug]? ?

Wed?Jun??6?11:11:25?2012?-?[debug]??Connecting?via?SSH?from?root@192.168.123.13(192.168.123.13)?to?root@192.168.123.14(192.168.123.14).. ?

Wed?Jun??6?11:11:25?2012?-?[debug]???ok. ?

Wed?Jun??6?11:11:26?2012?-?[debug]? ?

Wed?Jun??6?11:11:25?2012?-?[debug]??Connecting?via?SSH?from?root@192.168.123.14(192.168.123.14)?to?root@192.168.123.13(192.168.123.13).. ?

Wed?Jun??6?11:11:26?2012?-?[debug]???ok. ?

Wed?Jun??6?11:11:26?2012?-?[info]?All?SSH?connection?tests?passed?successfully.?

6：測試主從復制情況，默認使用root用戶連接

mysql>?select?user,host,password?from?mysql.user; ?

+--------+----------------+-------------------------------------------+ ?

|?user???|?host???????????|?password??????????????????????????????????| ?

+--------+----------------+-------------------------------------------+ ?

|?root???|?localhost??????|???????????????????????????????????????????|? ?

|?root???|?dg53.yang.com??|???????????????????????????????????????????|? ?

|?root???|?127.0.0.1??????|???????????????????????????????????????????|? ?

|?root???|?::1????????????|???????????????????????????????????????????|? ?

|????????|?localhost??????|???????????????????????????????????????????|? ?

|????????|?dg53.yang.com??|???????????????????????????????????????????|? ?

|?r_test?|?192.168.123.14?|?*6BB4837EB74329105EE4568DDA7DC67ED2CA2AD9?|? ?

+--------+----------------+-------------------------------------------+ ?

7?rows?in?set?(0.08?sec) ?

mysql>?use?mysql; ?

Database?changed ?

mysql>?update?user?set?host='192.168.123.%'?where?user='r_test'; ?

Query?OK,?1?row?affected?(0.05?sec) ?

Rows?matched:?1??Changed:?1??Warnings:?0 ?

mysql>?commit; ?

Query?OK,?0?rows?affected?(0.01?sec) ?

mysql>?update?user?set?host='192.168.123.%'?where?host='localhost'?and?user='root'?and?password=''; ?

Query?OK,?0?rows?affected?(0.00?sec) ?

Rows?matched:?1??Changed:?1??Warnings:?0 ?

mysql>?update?user?set?password=PASSWORD('123456')?where?user='root'?and?host='192.168.123.%'; ?

Query?OK,?0?rows?affected?(0.00?sec) ?

Rows?matched:?1??Changed:?0??Warnings:?0 ?

mysql>?flush?privileges; ?

Query?OK,?0?rows?affected?(0.02?sec) ?

[root@dg53?~]#?whereis?mysqlbinlog ?

mysqlbinlog:?/usr/bin/mysqlbinlog ?

[root@dg53?~]#?mv?/usr/bin/mysql*?/tmp ?

[root@dg54?~]#?mv?/usr/bin/mysql*?/tmp ?

[root@dg53?~]#?ln?-s?/usr/local/mysql5.5.25/bin/*?/usr/local/bin/ ?

[root@dg54?~]#?ln?-s?/usr/local/mysql5.5.25/bin/*?/usr/local/bin/ ?

[root@dg55?~]#?masterha_check_repl?--conf=/etc/masterha/app1.cnf? ?

Wed?Jun??6?12:39:03?2012?-?[warning]?Global?configuration?file?/etc/masterha_default.cnf?not?found.?Skipping. ?

Wed?Jun??6?12:39:03?2012?-?[info]?Reading?application?default?configurations?from?/etc/masterha/app1.cnf.. ?

Wed?Jun??6?12:39:03?2012?-?[info]?Reading?server?configurations?from?/etc/masterha/app1.cnf.. ?

Wed?Jun??6?12:39:03?2012?-?[info]?MHA::MasterMonitor?version?0.52. ?

Wed?Jun??6?12:39:03?2012?-?[info]?Dead?Servers: ?

Wed?Jun??6?12:39:03?2012?-?[info]?Alive?Servers: ?

Wed?Jun??6?12:39:03?2012?-?[info]???192.168.123.13(192.168.123.13:3306) ?

Wed?Jun??6?12:39:03?2012?-?[info]???192.168.123.14(192.168.123.14:3306) ?

Wed?Jun??6?12:39:03?2012?-?[info]?Alive?Slaves: ?

Wed?Jun??6?12:39:03?2012?-?[info]???192.168.123.14(192.168.123.14:3306)??Version=5.5.25-log?(oldest?major?version?between?slaves)?log-bin:enabled ?

Wed?Jun??6?12:39:03?2012?-?[info]?????Replicating?from?192.168.123.13(192.168.123.13:3306) ?

Wed?Jun??6?12:39:03?2012?-?[info]?????Primary?candidate?for?the?new?Master?(candidate_master?is?set) ?

Wed?Jun??6?12:39:03?2012?-?[info]?Current?Alive?Master:?192.168.123.13(192.168.123.13:3306) ?

Wed?Jun??6?12:39:03?2012?-?[info]?Checking?slave?configurations.. ?

Wed?Jun??6?12:39:03?2012?-?[warning]??read_only=1?is?not?set?on?slave?192.168.123.14(192.168.123.14:3306). ?

Wed?Jun??6?12:39:03?2012?-?[warning]??relay_log_purge=0?is?not?set?on?slave?192.168.123.14(192.168.123.14:3306). ?

Wed?Jun??6?12:39:03?2012?-?[info]?Checking?replication?filtering?settings.. ?

Wed?Jun??6?12:39:03?2012?-?[info]??binlog_do_db=?bbs,test,?binlog_ignore_db=?mysql?

Wed?Jun??6?12:39:03?2012?-?[info]??Replication?filtering?check?ok. ?

Wed?Jun??6?12:39:03?2012?-?[info]?Starting?SSH?connection?tests.. ?

Wed?Jun??6?12:39:05?2012?-?[info]?All?SSH?connection?tests?passed?successfully. ?

Wed?Jun??6?12:39:05?2012?-?[info]?Checking?MHA?Node?version.. ?

Wed?Jun??6?12:39:05?2012?-?[info]??Version?check?ok. ?

Wed?Jun??6?12:39:05?2012?-?[info]?Checking?SSH?publickey?authentication?and?checking?recovery?script?configurations?on?the?current?master.. ?

Wed?Jun??6?12:39:05?2012?-?[info]???Executing?command:?save_binary_logs?--command=test?--start_file=mysql-bin.000011?--start_pos=4?--binlog_dir=/mydata?--output_file=/var/tmp/save_binary_logs_test?--manager_version=0.52? ?

Wed?Jun??6?12:39:05?2012?-?[info]???Connecting?to?root@192.168.123.13(192.168.123.13)..? ?

??Creating?/var/tmp?if?not?exists..????ok. ?

??Checking?output?directory?is?accessible?or?not.. ?

???ok. ?

??Binlog?found?at?/mydata,?up?to?mysql-bin.000011 ?

Wed?Jun??6?12:39:06?2012?-?[info]?Master?setting?check?done. ?

Wed?Jun??6?12:39:06?2012?-?[info]?Checking?SSH?publickey?authentication?and?checking?recovery?script?configurations?on?all?alive?slave?servers.. ?

Wed?Jun??6?12:39:06?2012?-?[info]???Executing?command?:?apply_diff_relay_logs?--command=test?--slave_user=root?--slave_host=192.168.123.14?--slave_ip=192.168.123.14?--slave_port=3306?--workdir=/var/tmp?--target_version=5.5.25-log?--manager_version=0.52?--relay_log_info=/mydata/relay-log.info??--slave_pass=xxx?

Wed?Jun??6?12:39:06?2012?-?[info]???Connecting?to?root@192.168.123.14(192.168.123.14)..? ?

??Checking?slave?recovery?environment?settings.. ?

????Opening?/mydata/relay-log.info?...?ok. ?

????Relay?log?found?at?/mydata,?up?to?dg54-relay-bin.000019 ?

????Temporary?relay?log?file?is?/mydata/dg54-relay-bin.000019 ?

????Testing?mysql?connection?and?privileges..?done. ?

????Testing?mysqlbinlog?output..?done. ?

????Cleaning?up?test?file(s)..?done. ?

Wed?Jun??6?12:39:06?2012?-?[info]?Slaves?settings?check?done. ?

Wed?Jun??6?12:39:06?2012?-?[info]? ?

192.168.123.13?(current?master) ?

?+--192.168.123.14 ?

Wed?Jun??6?12:39:06?2012?-?[info]?Checking?replication?health?on?192.168.123.14.. ?

Wed?Jun??6?12:39:06?2012?-?[info]??ok. ?

Wed?Jun??6?12:39:06?2012?-?[warning]?master_ip_failover_script?is?not?defined. ?

Wed?Jun??6?12:39:06?2012?-?[warning]?shutdown_script?is?not?defined. ?

Wed?Jun??6?12:39:06?2012?-?[info]?Got?exit?code?0?(Not?master?dead). ?

MySQL?Replication?Health?is?OK.?

7：啟動管理節點進程

[root@dg55?~]#?nohup?masterha_manager?--conf=/etc/masterha/app1.cnf?>?/tmp/mha_manager.log??<?/dev/null?2>&1?& ?

[1]?25516 ?

[root@dg55?~]#?masterha_check_status?--conf=/etc/masterha/app1.cnf? ?

app1?(pid:25516)?is?running(0:PING_OK),?master:192.168.123.13?

三：測試failover過程
1：當前主庫為192.168.123.13，關閉主庫

mysql>?show?slave?hosts; ?

+-----------+------+------+-----------+ ?

+-----------+------+------+-----------+ ?

|?????????2?|??????|?3306?|?????????1?| ?

+-----------+------+------+-----------+ ?

1?row?in?set?(0.00?sec) ?

[root@dg53?~]#?service?mysqld?stop ?

Shutting?down?MySQL...[??OK??]?

2：在管理節點上觀察日志輸出

[root@dg55 ~]# tail -f /masterha/app1/manager.log
Wed Jun? 6 14:50:48 2012 - [info]
192.168.123.13 (current master)
?+--192.168.123.14

Wed Jun? 6 14:50:48 2012 - [warning] master_ip_failover_script is not defined.
Wed Jun? 6 14:50:48 2012 - [warning] shutdown_script is not defined.
Wed Jun? 6 14:50:48 2012 - [info] Set master ping interval 1 seconds.
Wed Jun? 6 14:50:48 2012 - [warning] secondary_check_script is not defined. It is highly recommended setting it to check master reachability from two or more routes.
Wed Jun? 6 14:50:48 2012 - [info] Starting ping health check on 192.168.123.13(192.168.123.13:3306)..
Wed Jun? 6 14:50:48 2012 - [info] Ping succeeded, sleeping until it doesn't respond..

Wed Jun? 6 14:51:32 2012 - [warning] Got error on MySQL ping: 2006 (MySQL server has gone away)
Wed Jun? 6 14:51:32 2012 - [info] HealthCheck: SSH to 192.168.123.13 is reachable.
Wed Jun? 6 14:51:33 2012 - [warning] Got error on MySQL connect: 2013 (Lost connection to MySQL server at 'reading initial communication packet', system error: 111)
Wed Jun? 6 14:51:33 2012 - [warning] Connection failed 1 time(s)..
Wed Jun? 6 14:51:34 2012 - [warning] Got error on MySQL connect: 2013 (Lost connection to MySQL server at 'reading initial communication packet', system error: 111)
Wed Jun? 6 14:51:34 2012 - [warning] Connection failed 2 time(s)..
Wed Jun? 6 14:51:35 2012 - [warning] Got error on MySQL connect: 2013 (Lost connection to MySQL server at 'reading initial communication packet', system error: 111)
Wed Jun? 6 14:51:35 2012 - [warning] Connection failed 3 time(s)..
Wed Jun? 6 14:51:35 2012 - [warning] Master is not reachable from health checker!
Wed Jun? 6 14:51:35 2012 - [warning] Master 192.168.123.13(192.168.123.13:3306) is not reachable!
Wed Jun? 6 14:51:35 2012 - [warning] SSH is reachable.
Wed Jun? 6 14:51:35 2012 - [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..
Wed Jun? 6 14:51:35 2012 - [warning] Global configuration file /etc/masterha_default.cnf not found. Skipping.
Wed Jun? 6 14:51:35 2012 - [info] Reading application default configurations from /etc/masterha/app1.cnf..
Wed Jun? 6 14:51:35 2012 - [info] Reading server configurations from /etc/masterha/app1.cnf..
Wed Jun? 6 14:51:35 2012 - [info] Dead Servers:
Wed Jun? 6 14:51:35 2012 - [info]?? 192.168.123.13(192.168.123.13:3306)
Wed Jun? 6 14:51:35 2012 - [info] Alive Servers:
Wed Jun? 6 14:51:35 2012 - [info]?? 192.168.123.14(192.168.123.14:3306)
Wed Jun? 6 14:51:35 2012 - [info] Alive Slaves:
Wed Jun? 6 14:51:35 2012 - [info]?? 192.168.123.14(192.168.123.14:3306)? Version=5.5.25-log (oldest major version between slaves) log-bin:enabled
Wed Jun? 6 14:51:35 2012 - [info]???? Replicating from 192.168.123.13(192.168.123.13:3306)
Wed Jun? 6 14:51:35 2012 - [info]???? Primary candidate for the new Master (candidate_master is set)
Wed Jun? 6 14:51:35 2012 - [info] Checking slave configurations..
Wed Jun? 6 14:51:35 2012 - [warning]? read_only=1 is not set on slave 192.168.123.14(192.168.123.14:3306).
Wed Jun? 6 14:51:35 2012 - [warning]? relay_log_purge=0 is not set on slave 192.168.123.14(192.168.123.14:3306).
Wed Jun? 6 14:51:35 2012 - [info] Checking replication filtering settings..
Wed Jun? 6 14:51:35 2012 - [info]? Replication filtering check ok.
Wed Jun? 6 14:51:35 2012 - [info] Master is down!
Wed Jun? 6 14:51:35 2012 - [info] Terminating monitoring script.
Wed Jun? 6 14:51:35 2012 - [info] Got exit code 20 (Master dead).
Wed Jun? 6 14:51:35 2012 - [info] MHA::MasterFailover version 0.52.
Wed Jun? 6 14:51:35 2012 - [info] Starting master failover.
Wed Jun? 6 14:51:35 2012 - [info]
Wed Jun? 6 14:51:35 2012 - [info] * Phase 1: Configuration Check Phase..
Wed Jun? 6 14:51:35 2012 - [info]
Wed Jun? 6 14:51:35 2012 - [info] Dead Servers:
Wed Jun? 6 14:51:35 2012 - [info]?? 192.168.123.13(192.168.123.13:3306)
Wed Jun? 6 14:51:35 2012 - [info] Checking master reachability via mysql(double check)..
Wed Jun? 6 14:51:35 2012 - [info]? ok.
Wed Jun? 6 14:51:35 2012 - [info] Alive Servers:
Wed Jun? 6 14:51:35 2012 - [info]?? 192.168.123.14(192.168.123.14:3306)
Wed Jun? 6 14:51:35 2012 - [info] Alive Slaves:
Wed Jun? 6 14:51:35 2012 - [info]?? 192.168.123.14(192.168.123.14:3306)? Version=5.5.25-log (oldest major version between slaves) log-bin:enabled
Wed Jun? 6 14:51:35 2012 - [info]???? Replicating from 192.168.123.13(192.168.123.13:3306)
Wed Jun? 6 14:51:35 2012 - [info]???? Primary candidate for the new Master (candidate_master is set)
Wed Jun? 6 14:51:35 2012 - [info] ** Phase 1: Configuration Check Phase completed.
Wed Jun? 6 14:51:35 2012 - [info]
Wed Jun? 6 14:51:35 2012 - [info] * Phase 2: Dead Master Shutdown Phase..
Wed Jun? 6 14:51:35 2012 - [info]
Wed Jun? 6 14:51:35 2012 - [info] Forcing shutdown so that applications never connect to the current master..
Wed Jun? 6 14:51:35 2012 - [warning] master_ip_failover_script is not set. Skipping invalidating dead master ip address.
Wed Jun? 6 14:51:35 2012 - [warning] shutdown_script is not set. Skipping explicit shutting down of the dead master.
Wed Jun? 6 14:51:35 2012 - [info] * Phase 2: Dead Master Shutdown Phase completed.
Wed Jun? 6 14:51:35 2012 - [info]
Wed Jun? 6 14:51:35 2012 - [info] * Phase 3: Master Recovery Phase..
Wed Jun? 6 14:51:35 2012 - [info]
Wed Jun? 6 14:51:35 2012 - [info] * Phase 3.1: Getting Latest Slaves Phase..
Wed Jun? 6 14:51:35 2012 - [info]
Wed Jun? 6 14:51:35 2012 - [info] The latest binary log file/position on all slaves is mysql-bin.000021:107
Wed Jun? 6 14:51:35 2012 - [info] Latest slaves (Slaves that received relay log files to the latest):
Wed Jun? 6 14:51:35 2012 - [info]?? 192.168.123.14(192.168.123.14:3306)? Version=5.5.25-log (oldest major version between slaves) log-bin:enabled
Wed Jun? 6 14:51:35 2012 - [info]???? Replicating from 192.168.123.13(192.168.123.13:3306)
Wed Jun? 6 14:51:35 2012 - [info]???? Primary candidate for the new Master (candidate_master is set)
Wed Jun? 6 14:51:35 2012 - [info] The oldest binary log file/position on all slaves is mysql-bin.000021:107
Wed Jun? 6 14:51:35 2012 - [info] Oldest slaves:
Wed Jun? 6 14:51:35 2012 - [info]?? 192.168.123.14(192.168.123.14:3306)? Version=5.5.25-log (oldest major version between slaves) log-bin:enabled
Wed Jun? 6 14:51:35 2012 - [info]???? Replicating from 192.168.123.13(192.168.123.13:3306)
Wed Jun? 6 14:51:35 2012 - [info]???? Primary candidate for the new Master (candidate_master is set)
Wed Jun? 6 14:51:35 2012 - [info]
Wed Jun? 6 14:51:35 2012 - [info] * Phase 3.2: Saving Dead Master's Binlog Phase..
Wed Jun? 6 14:51:35 2012 - [info]
Wed Jun? 6 14:51:35 2012 - [info] Fetching dead master's binary logs..
Wed Jun? 6 14:51:35 2012 - [info] Executing command on the dead master 192.168.123.13(192.168.123.13:3306): save_binary_logs --command=save --start_file=mysql-bin.000021? --start_pos=107 --binlog_dir=/mydata --output_file=/var/tmp/saved_master_binlog_from_192.168.123.13_3306_20120606145135.binlog --handle_raw_binlog=1 --disable_log_bin=0 --manager_version=0.52
? Creating /var/tmp if not exists..??? ok.
?Concat binary/relay logs from mysql-bin.000021 pos 107 to mysql-bin.000021 EOF into /var/tmp/saved_master_binlog_from_192.168.123.13_3306_20120606145135.binlog ..
? Dumping binlog format description event, from position 0 to 107.. ok.
? Dumping effective binlog data from /mydata/mysql-bin.000021 position 107 to tail(126).. ok.
?Concat succeeded.
Wed Jun? 6 14:51:36 2012 - [info] scp from root@192.168.123.13:/var/tmp/saved_master_binlog_from_192.168.123.13_3306_20120606145135.binlog to local:/masterha/app1/saved_master_binlog_from_192.168.123.13_3306_20120606145135.binlog succeeded.
Wed Jun? 6 14:51:36 2012 - [info] HealthCheck: SSH to 192.168.123.14 is reachable.
Wed Jun? 6 14:51:37 2012 - [info]
Wed Jun? 6 14:51:37 2012 - [info] * Phase 3.3: Determining New Master Phase..
Wed Jun? 6 14:51:37 2012 - [info]
Wed Jun? 6 14:51:37 2012 - [info] Finding the latest slave that has all relay logs for recovering other slaves..
Wed Jun? 6 14:51:37 2012 - [info] All slaves received relay logs to the same position. No need to resync each other.
Wed Jun? 6 14:51:37 2012 - [info] Searching new master from slaves..
Wed Jun? 6 14:51:37 2012 - [info]? Candidate masters from the configuration file:
Wed Jun? 6 14:51:37 2012 - [info]?? 192.168.123.14(192.168.123.14:3306)? Version=5.5.25-log (oldest major version between slaves) log-bin:enabled
Wed Jun? 6 14:51:37 2012 - [info]???? Replicating from 192.168.123.13(192.168.123.13:3306)
Wed Jun? 6 14:51:37 2012 - [info]???? Primary candidate for the new Master (candidate_master is set)
Wed Jun? 6 14:51:37 2012 - [info]? Non-candidate masters:
Wed Jun? 6 14:51:37 2012 - [info]? Searching from candidate_master slaves which have received the latest relay log events..
Wed Jun? 6 14:51:37 2012 - [info] New master is 192.168.123.14(192.168.123.14:3306)
Wed Jun? 6 14:51:37 2012 - [info] Starting master failover..
Wed Jun? 6 14:51:37 2012 - [info]
From:
192.168.123.13 (current master)
?+--192.168.123.14

To:
192.168.123.14 (new master)
Wed Jun? 6 14:51:37 2012 - [info]
Wed Jun? 6 14:51:37 2012 - [info] * Phase 3.3: New Master Diff Log Generation Phase..
Wed Jun? 6 14:51:37 2012 - [info]
Wed Jun? 6 14:51:37 2012 - [info]? This server has all relay logs. No need to generate diff files from the latest slave.
Wed Jun? 6 14:51:37 2012 - [info] Sending binlog..
Wed Jun? 6 14:51:37 2012 - [info] scp from local:/masterha/app1/saved_master_binlog_from_192.168.123.13_3306_20120606145135.binlog to root@192.168.123.14:/var/tmp/saved_master_binlog_from_192.168.123.13_3306_20120606145135.binlog succeeded.
Wed Jun? 6 14:51:37 2012 - [info]
Wed Jun? 6 14:51:37 2012 - [info] * Phase 3.4: Master Log Apply Phase..
Wed Jun? 6 14:51:37 2012 - [info]
Wed Jun? 6 14:51:37 2012 - [info] *NOTICE: If any error happens from this phase, manual recovery is needed.
Wed Jun? 6 14:51:37 2012 - [info] Starting recovery on 192.168.123.14(192.168.123.14:3306)..
Wed Jun? 6 14:51:37 2012 - [info]? Generating diffs succeeded.
Wed Jun? 6 14:51:37 2012 - [info] Waiting until all relay logs are applied.
Wed Jun? 6 14:51:37 2012 - [info]? done.
Wed Jun? 6 14:51:37 2012 - [info] Getting slave status..
Wed Jun? 6 14:51:37 2012 - [info] This slave(192.168.123.14)'s Exec_Master_Log_Pos equals to Read_Master_Log_Pos(mysql-bin.000021:107). No need to recover from Exec_Master_Log_Pos.
Wed Jun? 6 14:51:37 2012 - [info] Connecting to the target slave host 192.168.123.14, running recover script..
Wed Jun? 6 14:51:37 2012 - [info] Executing command: apply_diff_relay_logs --command=apply --slave_user=root --slave_host=192.168.123.14 --slave_ip=192.168.123.14? --slave_port=3306 --apply_files=/var/tmp/saved_master_binlog_from_192.168.123.13_3306_20120606145135.binlog --workdir=/var/tmp --target_version=5.5.25-log --timestamp=20120606145135 --handle_raw_binlog=1 --disable_log_bin=0 --manager_version=0.52 --slave_pass=xxx
Wed Jun? 6 14:51:37 2012 - [info]
Applying differential binary/relay log files /var/tmp/saved_master_binlog_from_192.168.123.13_3306_20120606145135.binlog on 192.168.123.14:3306. This may take long time...
Applying log files succeeded.
Wed Jun? 6 14:51:37 2012 - [info]? All relay logs were successfully applied.
Wed Jun? 6 14:51:37 2012 - [info] Getting new master's binlog name and position..
Wed Jun? 6 14:51:37 2012 - [info]? mysql-bin.000023:107
Wed Jun? 6 14:51:37 2012 - [info]? All other slaves should start replication from here. Statement should be: CHANGE MASTER TO MASTER_HOST='192.168.123.14', MASTER_PORT=3306, MASTER_LOG_FILE='mysql-bin.000023', MASTER_LOG_POS=107, MASTER_USER='r_test', MASTER_PASSWORD='xxx';
Wed Jun? 6 14:51:37 2012 - [warning] master_ip_failover_script is not set. Skipping taking over new master ip address.
Wed Jun? 6 14:51:37 2012 - [info] ** Finished master recovery successfully.
Wed Jun? 6 14:51:37 2012 - [info] * Phase 3: Master Recovery Phase completed.
Wed Jun? 6 14:51:37 2012 - [info]
Wed Jun? 6 14:51:37 2012 - [info] * Phase 4: Slaves Recovery Phase..
Wed Jun? 6 14:51:37 2012 - [info]
Wed Jun? 6 14:51:37 2012 - [info] * Phase 4.1: Starting Parallel Slave Diff Log Generation Phase..
Wed Jun? 6 14:51:37 2012 - [info]
Wed Jun? 6 14:51:37 2012 - [info] Generating relay diff files from the latest slave succeeded.
Wed Jun? 6 14:51:37 2012 - [info]
Wed Jun? 6 14:51:37 2012 - [info] * Phase 4.2: Starting Parallel Slave Log Apply Phase..
Wed Jun? 6 14:51:37 2012 - [info]
Wed Jun? 6 14:51:37 2012 - [info] All new slave servers recovered successfully.
Wed Jun? 6 14:51:37 2012 - [info]
Wed Jun? 6 14:51:37 2012 - [info] * Phase 5: New master cleanup phease..
Wed Jun? 6 14:51:37 2012 - [info]
Wed Jun? 6 14:51:37 2012 - [info] Resetting slave info on the new master..
Wed Jun? 6 14:51:37 2012 - [info] Master failover to 192.168.123.14(192.168.123.14:3306) completed successfully.
Wed Jun? 6 14:51:37 2012 - [info]

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

app1: MySQL Master failover 192.168.123.13 to 192.168.123.14 succeeded

Master 192.168.123.13 is down!

Check MHA Manager logs at dg55.yang.com:/masterha/app1/manager.log for details.

Started automated(non-interactive) failover.
The latest slave 192.168.123.14(192.168.123.14:3306) has all relay logs for recovery.
Selected 192.168.123.14 as a new master.
192.168.123.14: OK: Applying all logs succeeded.
Generating relay diff files from the latest slave succeeded.
192.168.123.14: Resetting slave info succeeded.
Master failover to 192.168.123.14(192.168.123.14:3306) completed successfully.

3：在原從庫192.168.123.14上查看結果

mysql>?show?master?status; ?

+------------------+----------+--------------+------------------+ ?

+------------------+----------+--------------+------------------+ ?

+------------------+----------+--------------+------------------+ ?

1?row?in?set?(0.00?sec) ?

mysql>?show?slave?status\G; ?

***************************?1.?row?*************************** ?

???????????????Slave_IO_State:? ?

??????????????????Master_Host:?192.168.123.13 ?

??????????????????Master_User:?r_test ?

??????????????????Master_Port:?3306 ?

????????????????Connect_Retry:?60 ?

??????????????Master_Log_File:? ?

??????????Read_Master_Log_Pos:?4 ?

???????????????Relay_Log_File:?dg54-relay-bin.000001 ?

????????????????Relay_Log_Pos:?4 ?

????????Relay_Master_Log_File:? ?

?????????????Slave_IO_Running:?No ?

????????????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:?0 ?

???????????????????Last_Error:? ?

?????????????????Skip_Counter:?0 ?

??????????Exec_Master_Log_Pos:?0 ?

??????????????Relay_Log_Space:?126 ?

??????????????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:?0 ?

???????????????Last_SQL_Error:? ?

??Replicate_Ignore_Server_Ids:? ?

?????????????Master_Server_Id:?1 ?

1?row?in?set?(0.00?sec) ?

ERROR:? ?

No?query?specified?

備注：本文只簡單記錄了mha的環境部署過程，更多高級的內容，例如配合keepalive使用VIP，讓客戶端連接數據庫透明化以及手動failover和master_ip_failover_script腳本，半同步復制等功能后續將繼續研究！

參考文章，感謝作者分享
http://who0168.blog.51cto.com/253401/699030
http://huoding.com/2011/12/18/139
http://www.vmcd.org/2012/04/mysql-high-availability-mha/

創作挑戰賽新人創作獎勵來咯，堅持創作打卡瓜分現金大獎

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