MMM無法完全地保證數據的一致性，所以MMM適用于對數據的一致性要求不是很高，但是又想最大程度的保證業務可用性的場景對于那些對數據一致性要求很高的業務，非常不建議采用MMM的這種高可用性架構，那么可以考慮使用MHA。在mysql故障切換的過程中，MHA能夠在0-30s內自動完成數據庫的故障切換操作，并且MHA能夠最大程度上保證數據的一致性，以達到真正意義上的高可用。
MHA軟件由兩部分組成，Manager工具包和Node工具包，具體的說明如下。
Manager工具包主要包括以下幾個工具：
masterha_check_ssh 檢查MHA的SSH配置狀況
masterha_check_repl 檢查MySQL復制狀況
masterha_manger 啟動MHA
masterha_check_status 檢測當前MHA運行狀態
masterha_master_monitor 檢測master是否宕機
masterha_master_switch 控制故障轉移（自動或者手動）
masterha_conf_host 添加或刪除配置的server信息
Node工具包（這些工具通常由MHA Manager的腳本觸發，無需人為操作）主要包括以下幾個工具：
save_binary_logs 保存和復制master的二進制日志
apply_diff_relay_logs 識別差異的中繼日志事件并將其差異的事件應用于其他的slave
filter_mysqlbinlog 去除不必要的ROLLBACK事件（MHA已不再使用這個工具）
purge_relay_logs 清除中繼日志（不會阻塞SQL線程）
注意：
（1）為了盡可能的減少主庫硬件損壞宕機造成的數據丟失，因此在配置MHA的同時建議配置成MySQL 5.5的半同步復制
1.1、搭建環境
用途 主機名 ip server_id 類型
master yaolansvr192.168.0.316803寫入
candicate master/monitor host yaolansvr_slave192.168.0.416804 讀
slave yaolansvr_slave01192.168.0.516805 讀
1.2、yaolansvr安裝ftp服務，并上傳mha安裝軟件
（1）關閉selinux，否則vsftpd報226錯誤
# mkdir -p /yangsq/ftp
# useradd -d /yangsq/ftp -s /sbin/nologin uftp
# passwd uftp
# chown -R uftp:uftp /yangsq/ftp
# yum list all|grep vsftpd
# yum -y install vsftpd.x86_64
# cp /etc/vsftpd/vsftpd.conf /etc/vsftpd/vsftpd.conf.bak
anonymous_enable=YES改為anonymous_enable=NO
local_enable=YES
write_enable=YES
chroot_local_user=YES
# chkconfig vsftpd on
# service vsftpd start
# yum install ftp.x86_64 -y
# sestatus
SELinux status: enabled
SELinuxfs mount: /selinux
Current mode: enforcing
Mode from config file: enforcing
Policy version: 24
Policy from config file: targeted
# setenforce 0
# ftp 192.168.0.3 21
1.3、所有數據庫節點安裝Perl模塊，同時做
yum -y install perl-DBD-MySQL
yum -y install perl-CPAN.x86_64
cd /yangsq/ftp
tar xvf mha4mysql-node-0.54.tar.gz
cd mha4mysql-node-0.54
perl Makefile.PL
make && make install
Installing /usr/local/share/perl5/MHA/BinlogPosFinderXid.pm
Installing /usr/local/share/perl5/MHA/SlaveUtil.pm
Installing /usr/local/share/perl5/MHA/NodeUtil.pm
Installing /usr/local/share/perl5/MHA/BinlogPosFinderElp.pm
Installing /usr/local/share/perl5/MHA/BinlogPosFindManager.pm
Installing /usr/local/share/perl5/MHA/BinlogPosFinder.pm
Installing /usr/local/share/perl5/MHA/BinlogManager.pm
Installing /usr/local/share/perl5/MHA/NodeConst.pm
Installing /usr/local/share/perl5/MHA/BinlogHeaderParser.pm
Installing /usr/local/share/man/man1/filter_mysqlbinlog.1
Installing /usr/local/share/man/man1/purge_relay_logs.1
Installing /usr/local/share/man/man1/apply_diff_relay_logs.1
Installing /usr/local/share/man/man1/save_binary_logs.1
Installing /usr/local/bin/filter_mysqlbinlog
Installing /usr/local/bin/apply_diff_relay_logs
Installing /usr/local/bin/save_binary_logs
Installing /usr/local/bin/purge_relay_logs
1.4、在yaolansvr_slave安裝mha manager
（1）No package perl-Log-Dispatch available.
# mv CentOS-Base.repo CentOS-Base.repo.bak
sftp> put C:\Users\Yaolan\Downloads\CentOS6-Base-163.repo
# yum clean all
# yum makecache
或者# rpm -ivh http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm
yum -y install perl-Config-Tiny
yum install perl-Log-Dispatch -y
yum install perl-Parallel-ForkManager -y
yum install perl-Time-HiRes -y
# tar xvf mha4mysql-manager-0.54.tar.gz
# cd mha4mysql-manager-0.54
# perl Makefile.PL
# make && make install
Installing /usr/local/share/perl5/MHA/ManagerAdminWrapper.pm
Installing /usr/local/share/perl5/MHA/ManagerUtil.pm
Installing /usr/local/share/perl5/MHA/MasterFailover.pm
Installing /usr/local/share/perl5/MHA/MasterMonitor.pm
Installing /usr/local/share/perl5/MHA/ManagerAdmin.pm
Installing /usr/local/share/perl5/MHA/Config.pm
Installing /usr/local/share/perl5/MHA/DBHelper.pm
Installing /usr/local/share/perl5/MHA/HealthCheck.pm
Installing /usr/local/share/perl5/MHA/FileStatus.pm
Installing /usr/local/share/perl5/MHA/MasterRotate.pm
Installing /usr/local/share/perl5/MHA/Server.pm
Installing /usr/local/share/perl5/MHA/ServerManager.pm
Installing /usr/local/share/perl5/MHA/SSHCheck.pm
Installing /usr/local/share/perl5/MHA/ManagerConst.pm
Installing /usr/local/share/man/man1/masterha_check_ssh.1
Installing /usr/local/share/man/man1/masterha_secondary_check.1
Installing /usr/local/share/man/man1/masterha_conf_host.1
Installing /usr/local/share/man/man1/masterha_check_status.1
Installing /usr/local/share/man/man1/masterha_stop.1
Installing /usr/local/share/man/man1/masterha_manager.1
Installing /usr/local/share/man/man1/masterha_master_monitor.1
Installing /usr/local/share/man/man1/masterha_check_repl.1
Installing /usr/local/share/man/man1/masterha_master_switch.1
Installing /usr/local/bin/masterha_manager
Installing /usr/local/bin/masterha_check_ssh
Installing /usr/local/bin/masterha_check_status
Installing /usr/local/bin/masterha_master_monitor
Installing /usr/local/bin/masterha_secondary_check
Installing /usr/local/bin/masterha_conf_host
Installing /usr/local/bin/masterha_check_repl
Installing /usr/local/bin/masterha_stop
Installing /usr/local/bin/masterha_master_switch
1.5、所有mysql服務器配置ssh登錄無密碼驗證，sshd_config已改不生效，萬能的重啟
注意：
（1）ssh-copy-id: command not found，解決：yum install openssh-clients -y
（2）對自己本身也要執行ssh-copy-id
（3）關閉slave后重啟mysql實例，slave相關的進程正常啟動
# ssh-keygen -t rsa
Generating public/private rsa key pair.
Enter file in which to save the key (/root/.ssh/id_rsa)
# yum install -y openssh-clients
# ssh-copy-id -i /root/.ssh/id_rsa.pub root@192.168.0.3
# ssh-copy-id -i /root/.ssh/id_rsa.pub root@192.168.0.4
# ssh-copy-id -i /root/.ssh/id_rsa.pub root@192.168.0.5
1.6、搭建主從復制環境
yaolansvr服務器master節點-----------
注意：
（1）datadir和server-id的設置，candidate master和slave只修改server-id
（2）
# vi /usr/mysql/etc/my.cnf
[mysqld]
port = 3306
datadir=/data/mysql/data
#慢查詢設置
slow-query-log-file=/var/log/MysqlQuery.log
long_query_time =5
slow_query_log=1
#server-id
server-id=16803
#binlog 設置
log-bin = /data/mysql/data/mysql-bin.log
binlog_cache_size = 8M
binlog_format=mixed
#全局
join_buffer_size = 2M
sort_buffer_size = 2M
read_rnd_buffer_size = 2M
read_buffer_size = 2M
max_heap_table_size = 64M
thread_cache_size=12
thread_concurrency = 12
query_cache_type = 1
query_cache_size = 32M
ft_min_word_len = 4
thread_stack = 192K
tmp_table_size = 64M
#myisam內存設置
key_buffer_size=1024M
#允許最大的復制傳輸
max_allowed_packet=64M
#跳過dns解析
skip-name-resolve
#連接數設置
max_connections = 1000
max_connect_errors = 200
#innodb設置
innodb_buffer_pool_size = 1G
innodb_additional_mem_pool_size = 16M
innodb_log_buffer_size = 8M
innodb_log_file_size = 512M
innodb_log_files_in_group = 3
innodb_file_per_table=1
innodb_stats_persistent_sample_pages=1000
innodb_write_io_threads = 8
innodb_read_io_threads = 8
innodb_thread_concurrency = 16
innodb_flush_log_at_trx_commit = 2
innodb_lock_wait_timeout = 30
sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES
# service mysqld start
1.6.1、在yaolansvr做備份，并創建復制用戶
# mysqldump -A --flush-privileges --lock-all-tables --events --routines --triggers --master-data=2>/yangsq/ftp/`date +%Y-%m-%d`_all.sql
mysql> grant replication slave on *.* to 'repl1'@'192.168.0.%' identified by '123456';
mysql> flush privileges;
1.6.2、使用ftp從yaolansvr獲取整庫的備份，并恢復
# mysql<2015-06-29_all.sql
# head -n 30 2015-06-29_all.sql |grep -i "change master"
-- CHANGE MASTER TO MASTER_LOG_FILE='mysql-bin.000008', MASTER_LOG_POS=120;
mysql> show slave status;
Empty set (0.00 sec)
mysql> change master to master_host='192.168.0.3',master_user='repl1',master_password='123456',master_port=3306,master_log_file='mysql-bin.000008',master_log_pos=120;
mysql> start slave;
Last_IO_Errno: 1593
Last_IO_Error: Fatal error: The slave I/O thread stops because master and slave have equal MySQL server UUIDs; these UUIDs must be different for replication to work.
解決：兩臺datadir/auto.cnf一樣，select uuid()不同，所以刪除candidate master上的auto.cnf，重新啟動實例
重啟mysql實例后：
mysql> show slave status\G
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.0.3
Master_User: repl1
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin.000008
Read_Master_Log_Pos: 408
Relay_Log_File: yaolansvr_slave-relay-bin.000003
Relay_Log_Pos: 571
Relay_Master_Log_File: mysql-bin.000008
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
1.6.3、其他的slave節點設置read_only=1（不寫入my.cnf，以供candidate master轉為主后，提供寫）
# mysql -e "set global read_only=1"
1.6.4、注意******************所有數據庫節點都要創建復制用戶
（1）candidate master不創建復制用戶，則報錯：
Mon Jun 29 17:28:00 2015 - [info] Alive Slaves:
Mon Jun 29 17:28:00 2015 - [info] 192.168.0.4(192.168.0.4:3306) Version=5.6.20-log (oldest major version between slaves) log-bin:enabled
Mon Jun 29 17:28:00 2015 - [info] Replicating from 192.168.0.3(192.168.0.3:3306)
Mon Jun 29 17:28:00 2015 - [info] Primary candidate for the new Master (candidate_master is set)
Mon Jun 29 17:28:00 2015 - [info] 192.168.0.5(192.168.0.5:3306) Version=5.6.20-log (oldest major version between slaves) log-bin:enabled
Mon Jun 29 17:28:00 2015 - [info] Replicating from 192.168.0.3(192.168.0.3:3306)
Mon Jun 29 17:28:00 2015 - [info] Not candidate for the new Master (no_master is set)
Mon Jun 29 17:28:00 2015 - [info] Current Alive Master: 192.168.0.3(192.168.0.3:3306)
Mon Jun 29 17:28:00 2015 - [info] Checking slave configurations..
Mon Jun 29 17:28:00 2015 - [info] Checking replication filtering settings..
Mon Jun 29 17:28:00 2015 - [info] binlog_do_db= , binlog_ignore_db=
Mon Jun 29 17:28:00 2015 - [info] Replication filtering check ok.
Mon Jun 29 17:28:00 2015 - [error][/usr/local/share/perl5/MHA/Server.pm, ln382] 192.168.0.4(192.168.0.4:3306): User repl1 does not exist or does not have REPLICATION SLAVE privilege! Other slaves can not start replication from this host.
（2）如果一個數據庫節點不會成為備選master，且no_master=1，則不需要創建復制用戶
只在candidate master創建復制用戶，必須與master的復制用戶相同
mysql> grant replication slave on *.* to 'repl1'@'192.168.0.%' identified by '123456';
mysql> flush privileges;
1.6.5、注意******************所有數據庫節點都要創建監控用戶，監控用戶必須要
只在master上創建監控用戶：但是會被復制
（1）其他節點必須創建監控用戶，否則報錯：
Mon Jun 29 18:02:41 2015 - [error][/usr/local/share/perl5/MHA/ServerManager.pm, ln255] Got MySQL error when connecting 192.168.0.4(192.168.0.4:3306) :1045:Access denied for user 'monitor'@'192.168.0.4' (using password: YES), but this is not mysql crash. Check MySQL server settings.
mysql> grant all privileges on *.* to 'monitor'@'192.168.0.%' identified by '123456';
mysql> flush privileges;
1.7、配置MHA
（1）master_binlog_dir=/home/soft/mysql/3306/binlog必須是binlog所在目錄
（2）如果一個數據庫節點不會成為備選master，且no_master=1，則不需要創建復制用戶
# mkdir -p /etc/mha/app1
# vi /etc/mha/app1/app1.cnf
[server default]
manager_workdir=/etc/mha/app1
manager_log=/var/log/manager.log
master_binlog_dir=/data/mysql/data/
ssh_user=root
user=monitor
password=123456
repl_user=repl1
repl_password=123456
secondary_check_script=masterha_secondary_check -s 192.168.0.3 -s 192.168.0.5
ping_interval=3
#master_ip_failover_script=/etc/mha/app1/master_ip_failover
#shutdown_script=/script/masterha/power_manager
#report_script=/script/masterha/send_report
#master_ip_online_change_script=/etc/mha/master_ip_failover
[server1]
hostname=192.168.0.3
port=3306
#master_binlog_dir=/data/mysql/data
candidate_master=1
[server2]
hostname=192.168.0.4
port=3306
#master_binlog_dir=/data/mysql/data
candidate_master=1
[server3]
hostname=192.168.0.5
port=3306
no_master=1
1.7.2、所有數據庫節點 relay log的自動清除
# mysql -e "set global relay_log_purge=0"
1.7.3、所有數據庫節點在環境變量中輸出mysqlbinlog
# ln -sv /usr/mysql/bin/mysqlbinlog /usr/bin/mysqlbinlog
1.7.4、檢查ssh的配置
注意：
（1）# cp /yangsq/ftp/mha4mysql-manager-0.54/samples/scripts/master_ip_failover /etc/mha/app1/master_ip_failover或將master_ip_failover_script=/etc/mha/app1/master_ip_failover注釋掉
否則報錯：Mon Jun 29 17:05:26 2015 - [info] /etc/mha/app1/master_ip_failover --command=status --ssh_user=root --orig_master_host=192.168.0.3 --orig_master_ip=192.168.0.3 --orig_master_port=3306
Bareword "FIXME_xxx" not allowed while "strict subs" in use at /etc/mha/app1/master_ip_failover line 93.
（2）沒有mysqlbinlog，報錯：
Mon Jun 29 17:52:11 2015 - [info] Executing command: save_binary_logs --command=test --start_pos=4 --binlog_dir=/var/lib/mysql,/var/log/mysql --output_file=/var/tmp/save_binary_logs_test --manager_version=0.54 --start_file=mysql-bin.000008
Mon Jun 29 17:52:11 2015 - [info] Connecting to root@192.168.0.3(192.168.0.3)..
Failed to save binary log: Binlog not found from /var/lib/mysql,/var/log/mysql! If you got this error at MHA Manager, please set "master_binlog_dir=/path/to/binlog_directory_of_the_master" correctly in the MHA Manager's configuration file and try again.
# masterha_check_ssh --conf=/etc/mha/app1/app1.cnf
# masterha_check_ssh --conf=/etc/mha/app1/app1.cnf
Mon Jun 29 17:33:39 2015 - [info] Reading server configurations from /etc/mha/app1/app1.cnf..
Mon Jun 29 17:33:39 2015 - [info] MHA::MasterMonitor version 0.54.
Mon Jun 29 17:33:39 2015 - [info] Dead Servers:
Mon Jun 29 17:33:39 2015 - [info] Alive Servers:
Mon Jun 29 17:33:39 2015 - [info] 192.168.0.3(192.168.0.3:3306)
Mon Jun 29 17:33:39 2015 - [info] 192.168.0.4(192.168.0.4:3306)
Mon Jun 29 17:33:39 2015 - [info] 192.168.0.5(192.168.0.5:3306)
Mon Jun 29 17:33:39 2015 - [info] Alive Slaves:
Mon Jun 29 17:33:39 2015 - [info] 192.168.0.4(192.168.0.4:3306) Version=5.6.20-log (oldest major version between slaves) log-bin:enabled
Mon Jun 29 17:33:39 2015 - [info] Replicating from 192.168.0.3(192.168.0.3:3306)
Mon Jun 29 17:33:39 2015 - [info] Primary candidate for the new Master (candidate_master is set)
Mon Jun 29 17:33:39 2015 - [info] 192.168.0.5(192.168.0.5:3306) Version=5.6.20-log (oldest major version between slaves) log-bin:enabled
Mon Jun 29 17:33:39 2015 - [info] Replicating from 192.168.0.3(192.168.0.3:3306)
Mon Jun 29 17:33:39 2015 - [info] Not candidate for the new Master (no_master is set)
Mon Jun 29 17:33:39 2015 - [info] Current Alive Master: 192.168.0.3(192.168.0.3:3306)
Mon Jun 29 17:33:39 2015 - [info] Checking slave configurations..
Mon Jun 29 17:33:39 2015 - [info] Checking replication filtering settings..
Mon Jun 29 17:33:39 2015 - [info] binlog_do_db= , binlog_ignore_db=
Mon Jun 29 17:33:39 2015 - [info] Replication filtering check ok.
Mon Jun 29 17:33:39 2015 - [info] Starting SSH connection tests..
Mon Jun 29 17:34:21 2015 - [info] All SSH connection tests passed successfully.
Mon Jun 29 17:34:21 2015 - [info] Checking MHA Node version..
Mon Jun 29 17:34:31 2015 - [info] Version check ok.
Mon Jun 29 17:34:31 2015 - [info] Checking SSH publickey authentication settings on the current master..
Mon Jun 29 17:34:32 2015 - [info] HealthCheck: SSH to 192.168.0.3 is reachable.
Mon Jun 29 17:34:32 2015 - [info] Master MHA Node version is 0.54.
Mon Jun 29 17:34:32 2015 - [info] Checking recovery script configurations on the current master..
Mon Jun 29 17:34:32 2015 - [info] Executing command: save_binary_logs --command=test --start_pos=4 --binlog_dir=/data/mysql/data --output_file=/var/tmp/save_binary_logs_test --manager_version=0.54 --start_file=mysql-bin.000008
Mon Jun 29 17:34:32 2015 - [info] Connecting to root@192.168.0.3(192.168.0.3)..
Creating /var/tmp if not exists.. ok.
Checking output directory is accessible or not..
ok.
Binlog found at /data/mysql/data, up to mysql-bin.000008
Mon Jun 29 17:34:32 2015 - [info] Master setting check done.
Mon Jun 29 17:34:32 2015 - [info] Checking SSH publickey authentication and checking recovery script configurations on all alive slave servers..
Mon Jun 29 17:34:32 2015 - [info] Executing command : apply_diff_relay_logs --command=test --slave_user='monitor' --slave_host=192.168.0.4 --slave_ip=192.168.0.4 --slave_port=3306 --workdir=/var/tmp --target_version=5.6.20-log --manager_version=0.54 --relay_log_info=/data/mysql/data/relay-log.info --relay_dir=/data/mysql/data/ --slave_pass=xxx
Mon Jun 29 17:34:32 2015 - [info] Connecting to root@192.168.0.4(192.168.0.4:22)..
Checking slave recovery environment settings..
Opening /data/mysql/data/relay-log.info ... ok.
Relay log found at /data/mysql/data, up to yaolansvr_slave-relay-bin.000003
Temporary relay log file is /data/mysql/data/yaolansvr_slave-relay-bin.000003
Testing mysql connection and privileges..Warning: Using a password on the command line interface can be insecure.
done.
Testing mysqlbinlog output.. done.
Cleaning up test file(s).. done.
Mon Jun 29 17:34:33 2015 - [info] Executing command : apply_diff_relay_logs --command=test --slave_user='monitor' --slave_host=192.168.0.5 --slave_ip=192.168.0.5 --slave_port=3306 --workdir=/var/tmp --target_version=5.6.20-log --manager_version=0.54 --relay_log_info=/data/mysql/data/relay-log.info --relay_dir=/data/mysql/data/ --slave_pass=xxx
Mon Jun 29 17:34:33 2015 - [info] Connecting to root@192.168.0.5(192.168.0.5:22)..
reverse mapping checking getaddrinfo for bogon [192.168.0.5] failed - POSSIBLE BREAK-IN ATTEMPT!
Checking slave recovery environment settings..
Opening /data/mysql/data/relay-log.info ... ok.
Relay log found at /data/mysql/data, up to yaolansvr_slave01-relay-bin.000002
Temporary relay log file is /data/mysql/data/yaolansvr_slave01-relay-bin.000002
Testing mysql connection and privileges..Warning: Using a password on the command line interface can be insecure.
done.
Testing mysqlbinlog output.. done.
Cleaning up test file(s).. done.
Mon Jun 29 17:34:43 2015 - [info] Slaves settings check done.
Mon Jun 29 17:34:43 2015 - [info]
192.168.0.3 (current master)
+--192.168.0.4
+--192.168.0.5
Mon Jun 29 17:34:43 2015 - [info] Checking replication health on 192.168.0.4..
Mon Jun 29 17:34:43 2015 - [info] ok.
Mon Jun 29 17:34:43 2015 - [info] Checking replication health on 192.168.0.5..
Mon Jun 29 17:34:43 2015 - [info] ok.
Mon Jun 29 17:34:43 2015 - [warning] master_ip_failover_script is not defined.
Mon Jun 29 17:34:43 2015 - [warning] shutdown_script is not defined.
Mon Jun 29 17:34:43 2015 - [info] Got exit code 0 (Not master dead).
1.8、vip配置
為了防止腦裂發生，推薦生產環境采用腳本的方式來管理虛擬ip，而不是使用keepalived來完成
1.8.1、修改故障切換的腳本
# vi /etc/mha/app1/master_ip_failover
####添加變量
my $vip = '192.168.0.10/24';
my $key = '1';
my $ssh_start_vip = "/sbin/ifconfig eth1:$key $vip";
my $ssh_stop_vip = "/sbin/ifconfig eth1:$key down";
####首先主節點需要啟動vip
# /sbin/ifconfig eth0:1 192.168.0.10/24
# /sbin/ifconfig eth0:1 down
####然后檢查復制環境狀況
# masterha_check_repl --conf=/etc/mha/app1/app1.cnf
# masterha_check_status --conf=/etc/mha/app1/app1.cnf
app1 is stopped(2:NOT_RUNNING).
# touch /etc/mha/app1/manager.log
# nohup masterha_manager --conf=/etc/mha/app1/app1.cnf /etc/mha/app1/manager.log 2>&1 &
# tail -f /var/log/manager.log
Tue Jun 30 10:21:25 2015 - [info] Got terminate signal. Exit.
Tue Jun 30 10:21:58 2015 - [info] MHA::MasterMonitor version 0.54.
Tue Jun 30 10:21:58 2015 - [info] Dead Servers:
Tue Jun 30 10:21:58 2015 - [info] Alive Servers:
Tue Jun 30 10:21:58 2015 - [info] 192.168.0.3(192.168.0.3:3306)
Tue Jun 30 10:21:58 2015 - [info] 192.168.0.4(192.168.0.4:3306)
Tue Jun 30 10:21:58 2015 - [info] 192.168.0.5(192.168.0.5:3306)
Tue Jun 30 10:21:58 2015 - [info] Alive Slaves:
Tue Jun 30 10:21:58 2015 - [info] 192.168.0.4(192.168.0.4:3306) Version=5.6.20-log (oldest major version between slaves) log-bin:enabled
Tue Jun 30 10:21:58 2015 - [info] Replicating from 192.168.0.3(192.168.0.3:3306)
Tue Jun 30 10:21:58 2015 - [info] Primary candidate for the new Master (candidate_master is set)
Tue Jun 30 10:21:58 2015 - [info] 192.168.0.5(192.168.0.5:3306) Version=5.6.20-log (oldest major version between slaves) log-bin:enabled
Tue Jun 30 10:21:58 2015 - [info] Replicating from 192.168.0.3(192.168.0.3:3306)
Tue Jun 30 10:21:58 2015 - [info] Not candidate for the new Master (no_master is set)
Tue Jun 30 10:21:58 2015 - [info] Current Alive Master: 192.168.0.3(192.168.0.3:3306)
Tue Jun 30 10:21:58 2015 - [info] Checking slave configurations..
Tue Jun 30 10:21:58 2015 - [info] read_only=1 is not set on slave 192.168.0.4(192.168.0.4:3306).
Tue Jun 30 10:21:58 2015 - [warning] relay_log_purge=0 is not set on slave 192.168.0.4(192.168.0.4:3306).
Tue Jun 30 10:21:58 2015 - [info] read_only=1 is not set on slave 192.168.0.5(192.168.0.5:3306).
Tue Jun 30 10:21:58 2015 - [warning] relay_log_purge=0 is not set on slave 192.168.0.5(192.168.0.5:3306).
Tue Jun 30 10:21:58 2015 - [info] Checking replication filtering settings..
Tue Jun 30 10:21:58 2015 - [info] binlog_do_db= , binlog_ignore_db=
Tue Jun 30 10:21:58 2015 - [info] Replication filtering check ok.
Tue Jun 30 10:21:58 2015 - [info] Starting SSH connection tests..
Tue Jun 30 10:22:00 2015 - [info] All SSH connection tests passed successfully.
Tue Jun 30 10:22:00 2015 - [info] Checking MHA Node version..
Tue Jun 30 10:22:01 2015 - [info] Version check ok.
Tue Jun 30 10:22:01 2015 - [info] Checking SSH publickey authentication settings on the current master..
Tue Jun 30 10:22:01 2015 - [info] HealthCheck: SSH to 192.168.0.3 is reachable.
Tue Jun 30 10:22:01 2015 - [info] Master MHA Node version is 0.54.
Tue Jun 30 10:22:01 2015 - [info] Checking recovery script configurations on the current master..
Tue Jun 30 10:22:01 2015 - [info] Executing command: save_binary_logs --command=test --start_pos=4 --binlog_dir=/data/mysql/data/ --output_file=/var/tmp/save_binary_logs_test --manager_version=0.54 --start_file=mysql-bin.000009
Tue Jun 30 10:22:01 2015 - [info] Connecting to root@192.168.0.3(192.168.0.3)..
Creating /var/tmp if not exists.. ok.
Checking output directory is accessible or not..
ok.
Binlog found at /data/mysql/data/, up to mysql-bin.000009
Tue Jun 30 10:22:01 2015 - [info] Master setting check done.
Tue Jun 30 10:22:01 2015 - [info] Checking SSH publickey authentication and checking recovery script configurations on all alive slave servers..
Tue Jun 30 10:22:01 2015 - [info] Executing command : apply_diff_relay_logs --command=test --slave_user='monitor' --slave_host=192.168.0.4 --slave_ip=192.168.0.4 --slave_port=3306 --workdir=/var/tmp --target_version=5.6.20-log --manager_version=0.54 --relay_log_info=/data/mysql/data/relay-log.info --relay_dir=/data/mysql/data/ --slave_pass=xxx
Tue Jun 30 10:22:01 2015 - [info] Connecting to root@192.168.0.4(192.168.0.4:22)..
Checking slave recovery environment settings..
Opening /data/mysql/data/relay-log.info ... ok.
Relay log found at /data/mysql/data, up to yaolansvr_slave-relay-bin.000006
Temporary relay log file is /data/mysql/data/yaolansvr_slave-relay-bin.000006
Testing mysql connection and privileges..Warning: Using a password on the command line interface can be insecure.
done.
Testing mysqlbinlog output.. done.
Cleaning up test file(s).. done.
Tue Jun 30 10:22:02 2015 - [info] Executing command : apply_diff_relay_logs --command=test --slave_user='monitor' --slave_host=192.168.0.5 --slave_ip=192.168.0.5 --slave_port=3306 --workdir=/var/tmp --target_version=5.6.20-log --manager_version=0.54 --relay_log_info=/data/mysql/data/relay-log.info --relay_dir=/data/mysql/data/ --slave_pass=xxx
Tue Jun 30 10:22:02 2015 - [info] Connecting to root@192.168.0.5(192.168.0.5:22)..
Checking slave recovery environment settings..
Opening /data/mysql/data/relay-log.info ... ok.
Relay log found at /data/mysql/data, up to yaolansvr_slave01-relay-bin.000005
Temporary relay log file is /data/mysql/data/yaolansvr_slave01-relay-bin.000005
Testing mysql connection and privileges..Warning: Using a password on the command line interface can be insecure.
done.
Testing mysqlbinlog output.. done.
Cleaning up test file(s).. done.
Tue Jun 30 10:22:02 2015 - [info] Slaves settings check done.
Tue Jun 30 10:22:02 2015 - [info]
192.168.0.3 (current master)
+--192.168.0.4
+--192.168.0.5
Tue Jun 30 10:22:02 2015 - [info] Checking master_ip_failover_script status:
Tue Jun 30 10:22:02 2015 - [info] /etc/mha/app1/master_ip_failover --command=status --ssh_user=root --orig_master_host=192.168.0.3 --orig_master_ip=192.168.0.3 --orig_master_port=3306
Tue Jun 30 10:22:02 2015 - [info] OK.
Tue Jun 30 10:22:02 2015 - [warning] shutdown_script is not defined.
Tue Jun 30 10:22:02 2015 - [info] Set master ping interval 3 seconds.
Tue Jun 30 10:22:02 2015 - [info] Set secondary check script: masterha_secondary_check -s 192.168.0.3 -s 192.168.0.5
Tue Jun 30 10:22:02 2015 - [info] Starting ping health check on 192.168.0.3(192.168.0.3:3306)..
Tue Jun 30 10:22:02 2015 - [info] Ping(SELECT) succeeded, waiting until MySQL doesn't respond..
# masterha_check_status --conf=/etc/mha/app1/app1.cnf
app1 (pid:2243) is running(0:PING_OK), master:192.168.0.3
# masterha_stop --conf=/etc/mha/app1/app1.cnf
進行切換后：
# tail -f /var/log/manager.log
Tue Jun 30 10:28:02 2015 - [warning] Got error on MySQL select ping: 2006 (MySQL server has gone away)
Tue Jun 30 10:28:02 2015 - [info] Executing SSH check script: save_binary_logs --command=test --start_pos=4 --binlog_dir=/data/mysql/data/ --output_file=/var/tmp/save_binary_logs_test --manager_version=0.54 --binlog_prefix=mysql-bin
Tue Jun 30 10:28:03 2015 - [info] Executing seconary network check script: masterha_secondary_check -s 192.168.0.3 -s 192.168.0.5 --user=root --master_host=192.168.0.3 --master_ip=192.168.0.3 --master_port=3306
Tue Jun 30 10:28:03 2015 - [info] HealthCheck: SSH to 192.168.0.3 is reachable.
Monitoring server 192.168.0.3 is reachable, Master is not reachable from 192.168.0.3. OK.
Monitoring server 192.168.0.5 is reachable, Master is not reachable from 192.168.0.5. OK.
Tue Jun 30 10:28:03 2015 - [info] Master is not reachable from all other monitoring servers. Failover should start.
Tue Jun 30 10:28:05 2015 - [warning] Got error on MySQL connect: 2013 (Lost connection to MySQL server at 'reading initial communication packet', system error: 111)
Tue Jun 30 10:28:05 2015 - [warning] Connection failed 1 time(s)..
Tue Jun 30 10:28:08 2015 - [warning] Got error on MySQL connect: 2013 (Lost connection to MySQL server at 'reading initial communication packet', system error: 111)
Tue Jun 30 10:28:08 2015 - [warning] Connection failed 2 time(s)..
Tue Jun 30 10:28:11 2015 - [warning] Got error on MySQL connect: 2013 (Lost connection to MySQL server at 'reading initial communication packet', system error: 111)
Tue Jun 30 10:28:11 2015 - [warning] Connection failed 3 time(s)..
Tue Jun 30 10:28:11 2015 - [warning] Master is not reachable from health checker!
Tue Jun 30 10:28:11 2015 - [warning] Master 192.168.0.3(192.168.0.3:3306) is not reachable!
Tue Jun 30 10:28:11 2015 - [warning] SSH is reachable.
Tue Jun 30 10:28:11 2015 - [info] Connecting to a master server failed. Reading configuration file /etc/masterha_default.cnf and /etc/mha/app1/app1.cnf again, and trying to connect to all servers to check server status..
Tue Jun 30 10:28:11 2015 - [warning] Global configuration file /etc/masterha_default.cnf not found. Skipping.
Tue Jun 30 10:28:11 2015 - [info] Reading application default configurations from /etc/mha/app1/app1.cnf..
Tue Jun 30 10:28:11 2015 - [info] Reading server configurations from /etc/mha/app1/app1.cnf..
Tue Jun 30 10:28:12 2015 - [info] Dead Servers:
Tue Jun 30 10:28:12 2015 - [info] 192.168.0.3(192.168.0.3:3306)
Tue Jun 30 10:28:12 2015 - [info] Alive Servers:
Tue Jun 30 10:28:12 2015 - [info] 192.168.0.4(192.168.0.4:3306)
Tue Jun 30 10:28:12 2015 - [info] 192.168.0.5(192.168.0.5:3306)
Tue Jun 30 10:28:12 2015 - [info] Alive Slaves:
Tue Jun 30 10:28:12 2015 - [info] 192.168.0.4(192.168.0.4:3306) Version=5.6.20-log (oldest major version between slaves) log-bin:enabled
Tue Jun 30 10:28:12 2015 - [info] Replicating from 192.168.0.3(192.168.0.3:3306)
Tue Jun 30 10:28:12 2015 - [info] Primary candidate for the new Master (candidate_master is set)
Tue Jun 30 10:28:12 2015 - [info] 192.168.0.5(192.168.0.5:3306) Version=5.6.20-log (oldest major version between slaves) log-bin:enabled
Tue Jun 30 10:28:12 2015 - [info] Replicating from 192.168.0.3(192.168.0.3:3306)
Tue Jun 30 10:28:12 2015 - [info] Not candidate for the new Master (no_master is set)
Tue Jun 30 10:28:12 2015 - [info] Checking slave configurations..
Tue Jun 30 10:28:12 2015 - [warning] relay_log_purge=0 is not set on slave 192.168.0.4(192.168.0.4:3306).
Tue Jun 30 10:28:12 2015 - [warning] relay_log_purge=0 is not set on slave 192.168.0.5(192.168.0.5:3306).
Tue Jun 30 10:28:12 2015 - [info] Checking replication filtering settings..
Tue Jun 30 10:28:12 2015 - [info] Replication filtering check ok.
Tue Jun 30 10:28:12 2015 - [info] Master is down!
Tue Jun 30 10:28:12 2015 - [info] Terminating monitoring script.
Tue Jun 30 10:28:12 2015 - [info] Got exit code 20 (Master dead).
Tue Jun 30 10:28:12 2015 - [info] MHA::MasterFailover version 0.54.
Tue Jun 30 10:28:12 2015 - [info] Starting master failover.
Tue Jun 30 10:28:12 2015 - [info]
Tue Jun 30 10:28:12 2015 - [info] * Phase 1: Configuration Check Phase..
Tue Jun 30 10:28:12 2015 - [info]
Tue Jun 30 10:28:12 2015 - [info] Dead Servers:
Tue Jun 30 10:28:12 2015 - [info] 192.168.0.3(192.168.0.3:3306)
Tue Jun 30 10:28:12 2015 - [info] Checking master reachability via mysql(double check)..
Tue Jun 30 10:28:12 2015 - [info] ok.
Tue Jun 30 10:28:12 2015 - [info] Alive Servers:
Tue Jun 30 10:28:12 2015 - [info] 192.168.0.4(192.168.0.4:3306)
Tue Jun 30 10:28:12 2015 - [info] 192.168.0.5(192.168.0.5:3306)
Tue Jun 30 10:28:12 2015 - [info] Alive Slaves:
Tue Jun 30 10:28:12 2015 - [info] 192.168.0.4(192.168.0.4:3306) Version=5.6.20-log (oldest major version between slaves) log-bin:enabled
Tue Jun 30 10:28:12 2015 - [info] Replicating from 192.168.0.3(192.168.0.3:3306)
Tue Jun 30 10:28:12 2015 - [info] Primary candidate for the new Master (candidate_master is set)
Tue Jun 30 10:28:12 2015 - [info] 192.168.0.5(192.168.0.5:3306) Version=5.6.20-log (oldest major version between slaves) log-bin:enabled
Tue Jun 30 10:28:12 2015 - [info] Replicating from 192.168.0.3(192.168.0.3:3306)
Tue Jun 30 10:28:12 2015 - [info] Not candidate for the new Master (no_master is set)
Tue Jun 30 10:28:12 2015 - [info] ** Phase 1: Configuration Check Phase completed.
Tue Jun 30 10:28:12 2015 - [info]
Tue Jun 30 10:28:12 2015 - [info] * Phase 2: Dead Master Shutdown Phase..
Tue Jun 30 10:28:12 2015 - [info]
Tue Jun 30 10:28:12 2015 - [info] Forcing shutdown so that applications never connect to the current master..
Tue Jun 30 10:28:12 2015 - [info] Executing master IP deactivatation script:
Tue Jun 30 10:28:12 2015 - [info] /etc/mha/app1/master_ip_failover --orig_master_host=192.168.0.3 --orig_master_ip=192.168.0.3 --orig_master_port=3306 --command=stopssh --ssh_user=root
Disabling the VIP on old master: 192.168.0.3
Tue Jun 30 10:28:13 2015 - [info] done.
Tue Jun 30 10:28:13 2015 - [warning] shutdown_script is not set. Skipping explicit shutting down of the dead master.
Tue Jun 30 10:28:13 2015 - [info] * Phase 2: Dead Master Shutdown Phase completed.
Tue Jun 30 10:28:13 2015 - [info]
Tue Jun 30 10:28:13 2015 - [info] * Phase 3: Master Recovery Phase..
Tue Jun 30 10:28:13 2015 - [info]
Tue Jun 30 10:28:13 2015 - [info] * Phase 3.1: Getting Latest Slaves Phase..
Tue Jun 30 10:28:13 2015 - [info]
Tue Jun 30 10:28:13 2015 - [info] The latest binary log file/position on all slaves is mysql-bin.000009:120
Tue Jun 30 10:28:13 2015 - [info] Latest slaves (Slaves that received relay log files to the latest):
Tue Jun 30 10:28:13 2015 - [info] 192.168.0.4(192.168.0.4:3306) Version=5.6.20-log (oldest major version between slaves) log-bin:enabled
Tue Jun 30 10:28:13 2015 - [info] Replicating from 192.168.0.3(192.168.0.3:3306)
Tue Jun 30 10:28:13 2015 - [info] Primary candidate for the new Master (candidate_master is set)
Tue Jun 30 10:28:13 2015 - [info] 192.168.0.5(192.168.0.5:3306) Version=5.6.20-log (oldest major version between slaves) log-bin:enabled
Tue Jun 30 10:28:13 2015 - [info] Replicating from 192.168.0.3(192.168.0.3:3306)
Tue Jun 30 10:28:13 2015 - [info] Not candidate for the new Master (no_master is set)
Tue Jun 30 10:28:13 2015 - [info] The oldest binary log file/position on all slaves is mysql-bin.000009:120
Tue Jun 30 10:28:13 2015 - [info] Oldest slaves:
Tue Jun 30 10:28:13 2015 - [info] 192.168.0.4(192.168.0.4:3306) Version=5.6.20-log (oldest major version between slaves) log-bin:enabled
Tue Jun 30 10:28:13 2015 - [info] Replicating from 192.168.0.3(192.168.0.3:3306)
Tue Jun 30 10:28:13 2015 - [info] Primary candidate for the new Master (candidate_master is set)
Tue Jun 30 10:28:13 2015 - [info] 192.168.0.5(192.168.0.5:3306) Version=5.6.20-log (oldest major version between slaves) log-bin:enabled
Tue Jun 30 10:28:13 2015 - [info] Replicating from 192.168.0.3(192.168.0.3:3306)
Tue Jun 30 10:28:13 2015 - [info] Not candidate for the new Master (no_master is set)
Tue Jun 30 10:28:13 2015 - [info]
Tue Jun 30 10:28:13 2015 - [info] * Phase 3.2: Saving Dead Master's Binlog Phase..
Tue Jun 30 10:28:13 2015 - [info]
Tue Jun 30 10:28:13 2015 - [info] Fetching dead master's binary logs..
Tue Jun 30 10:28:13 2015 - [info] Executing command on the dead master 192.168.0.3(192.168.0.3:3306): save_binary_logs --command=save --start_file=mysql-bin.000009 --start_pos=120 --binlog_dir=/data/mysql/data/ --output_file=/var/tmp/saved_master_binlog_from_192.168.0.3_3306_20150630102812.binlog --handle_raw_binlog=1 --disable_log_bin=0 --manager_version=0.54
Creating /var/tmp if not exists.. ok.
Concat binary/relay logs from mysql-bin.000009 pos 120 to mysql-bin.000009 EOF into /var/tmp/saved_master_binlog_from_192.168.0.3_3306_20150630102812.binlog ..
Dumping binlog format description event, from position 0 to 120.. ok.
Dumping effective binlog data from /data/mysql/data//mysql-bin.000009 position 120 to tail(143).. ok.
Concat succeeded.
Tue Jun 30 10:28:14 2015 - [info] scp from root@192.168.0.3:/var/tmp/saved_master_binlog_from_192.168.0.3_3306_20150630102812.binlog to local:/etc/mha/app1/saved_master_binlog_from_192.168.0.3_3306_20150630102812.binlog succeeded.
Tue Jun 30 10:28:14 2015 - [info] HealthCheck: SSH to 192.168.0.4 is reachable.
Tue Jun 30 10:28:15 2015 - [info] HealthCheck: SSH to 192.168.0.5 is reachable.
Tue Jun 30 10:28:15 2015 - [info]
Tue Jun 30 10:28:15 2015 - [info] * Phase 3.3: Determining New Master Phase..
Tue Jun 30 10:28:15 2015 - [info]
Tue Jun 30 10:28:15 2015 - [info] Finding the latest slave that has all relay logs for recovering other slaves..
Tue Jun 30 10:28:15 2015 - [info] All slaves received relay logs to the same position. No need to resync each other.
Tue Jun 30 10:28:15 2015 - [info] Searching new master from slaves..
Tue Jun 30 10:28:15 2015 - [info] Candidate masters from the configuration file:
Tue Jun 30 10:28:15 2015 - [info] 192.168.0.4(192.168.0.4:3306) Version=5.6.20-log (oldest major version between slaves) log-bin:enabled
Tue Jun 30 10:28:15 2015 - [info] Replicating from 192.168.0.3(192.168.0.3:3306)
Tue Jun 30 10:28:15 2015 - [info] Primary candidate for the new Master (candidate_master is set)
Tue Jun 30 10:28:15 2015 - [info] Non-candidate masters:
Tue Jun 30 10:28:15 2015 - [info] 192.168.0.5(192.168.0.5:3306) Version=5.6.20-log (oldest major version between slaves) log-bin:enabled
Tue Jun 30 10:28:15 2015 - [info] Replicating from 192.168.0.3(192.168.0.3:3306)
Tue Jun 30 10:28:15 2015 - [info] Not candidate for the new Master (no_master is set)
Tue Jun 30 10:28:15 2015 - [info] Searching from candidate_master slaves which have received the latest relay log events..
Tue Jun 30 10:28:15 2015 - [info] New master is 192.168.0.4(192.168.0.4:3306)
Tue Jun 30 10:28:15 2015 - [info] Starting master failover..
Tue Jun 30 10:28:15 2015 - [info]
From:
192.168.0.3 (current master)
+--192.168.0.4
+--192.168.0.5
To:
192.168.0.4 (new master)
+--192.168.0.5
Tue Jun 30 10:28:15 2015 - [info]
Tue Jun 30 10:28:15 2015 - [info] * Phase 3.3: New Master Diff Log Generation Phase..
Tue Jun 30 10:28:15 2015 - [info]
Tue Jun 30 10:28:15 2015 - [info] This server has all relay logs. No need to generate diff files from the latest slave.
Tue Jun 30 10:28:15 2015 - [info] Sending binlog..
Tue Jun 30 10:28:15 2015 - [info] scp from local:/etc/mha/app1/saved_master_binlog_from_192.168.0.3_3306_20150630102812.binlog to root@192.168.0.4:/var/tmp/saved_master_binlog_from_192.168.0.3_3306_20150630102812.binlog succeeded.
Tue Jun 30 10:28:15 2015 - [info]
Tue Jun 30 10:28:15 2015 - [info] * Phase 3.4: Master Log Apply Phase..
Tue Jun 30 10:28:15 2015 - [info]
Tue Jun 30 10:28:15 2015 - [info] *NOTICE: If any error happens from this phase, manual recovery is needed.
Tue Jun 30 10:28:15 2015 - [info] Starting recovery on 192.168.0.4(192.168.0.4:3306)..
Tue Jun 30 10:28:15 2015 - [info] Generating diffs succeeded.
Tue Jun 30 10:28:15 2015 - [info] Waiting until all relay logs are applied.
Tue Jun 30 10:28:15 2015 - [info] done.
Tue Jun 30 10:28:16 2015 - [info] Getting slave status..
Tue Jun 30 10:28:16 2015 - [info] This slave(192.168.0.4)'s Exec_Master_Log_Pos equals to Read_Master_Log_Pos(mysql-bin.000009:120). No need to recover from Exec_Master_Log_Pos.
Tue Jun 30 10:28:16 2015 - [info] Connecting to the target slave host 192.168.0.4, running recover script..
Tue Jun 30 10:28:16 2015 - [info] Executing command: apply_diff_relay_logs --command=apply --slave_user='monitor' --slave_host=192.168.0.4 --slave_ip=192.168.0.4 --slave_port=3306 --apply_files=/var/tmp/saved_master_binlog_from_192.168.0.3_3306_20150630102812.binlog --workdir=/var/tmp --target_version=5.6.20-log --timestamp=20150630102812 --handle_raw_binlog=1 --disable_log_bin=0 --manager_version=0.54 --slave_pass=xxx
Tue Jun 30 10:28:16 2015 - [info]
MySQL client version is 5.6.20. Using --binary-mode.
Applying differential binary/relay log files /var/tmp/saved_master_binlog_from_192.168.0.3_3306_20150630102812.binlog on 192.168.0.4:3306. This may take long time...
Applying log files succeeded.
Tue Jun 30 10:28:16 2015 - [info] All relay logs were successfully applied.
Tue Jun 30 10:28:16 2015 - [info] Getting new master's binlog name and position..
Tue Jun 30 10:28:16 2015 - [info] mysql-bin.000015:120
Tue Jun 30 10:28:16 2015 - [info] All other slaves should start replication from here. Statement should be: CHANGE MASTER TO MASTER_HOST='192.168.0.4', MASTER_PORT=3306, MASTER_LOG_FILE='mysql-bin.000015', MASTER_LOG_POS=120, MASTER_USER='repl1', MASTER_PASSWORD='xxx';
Tue Jun 30 10:28:16 2015 - [info] Executing master IP activate script:
Tue Jun 30 10:28:16 2015 - [info] /etc/mha/app1/master_ip_failover --command=start --ssh_user=root --orig_master_host=192.168.0.3 --orig_master_ip=192.168.0.3 --orig_master_port=3306 --new_master_host=192.168.0.4 --new_master_ip=192.168.0.4 --new_master_port=3306 --new_master_user='monitor' --new_master_password='123456'
Enabling the VIP - 192.168.0.10/24 on the new master - 192.168.0.4
Tue Jun 30 10:28:16 2015 - [info] OK.
Tue Jun 30 10:28:16 2015 - [info] Setting read_only=0 on 192.168.0.4(192.168.0.4:3306)..
Tue Jun 30 10:28:16 2015 - [info] ok.
Tue Jun 30 10:28:16 2015 - [info] ** Finished master recovery successfully.
Tue Jun 30 10:28:16 2015 - [info] * Phase 3: Master Recovery Phase completed.
Tue Jun 30 10:28:16 2015 - [info]
Tue Jun 30 10:28:16 2015 - [info] * Phase 4: Slaves Recovery Phase..
Tue Jun 30 10:28:16 2015 - [info]
Tue Jun 30 10:28:16 2015 - [info] * Phase 4.1: Starting Parallel Slave Diff Log Generation Phase..
Tue Jun 30 10:28:16 2015 - [info]
Tue Jun 30 10:28:16 2015 - [info] -- Slave diff file generation on host 192.168.0.5(192.168.0.5:3306) started, pid: 2658. Check tmp log /etc/mha/app1/192.168.0.5_3306_20150630102812.log if it takes time..
Tue Jun 30 10:28:16 2015 - [info]
Tue Jun 30 10:28:16 2015 - [info] Log messages from 192.168.0.5 ...
Tue Jun 30 10:28:16 2015 - [info]
Tue Jun 30 10:28:16 2015 - [info] This server has all relay logs. No need to generate diff files from the latest slave.
Tue Jun 30 10:28:16 2015 - [info] End of log messages from 192.168.0.5.
Tue Jun 30 10:28:16 2015 - [info] -- 192.168.0.5(192.168.0.5:3306) has the latest relay log events.
Tue Jun 30 10:28:16 2015 - [info] Generating relay diff files from the latest slave succeeded.
Tue Jun 30 10:28:16 2015 - [info]
Tue Jun 30 10:28:16 2015 - [info] * Phase 4.2: Starting Parallel Slave Log Apply Phase..
Tue Jun 30 10:28:16 2015 - [info]
Tue Jun 30 10:28:16 2015 - [info] -- Slave recovery on host 192.168.0.5(192.168.0.5:3306) started, pid: 2660. Check tmp log /etc/mha/app1/192.168.0.5_3306_20150630102812.log if it takes time..
Tue Jun 30 10:28:18 2015 - [info]
Tue Jun 30 10:28:18 2015 - [info] Log messages from 192.168.0.5 ...
Tue Jun 30 10:28:18 2015 - [info]
Tue Jun 30 10:28:16 2015 - [info] Sending binlog..
Tue Jun 30 10:28:17 2015 - [info] scp from local:/etc/mha/app1/saved_master_binlog_from_192.168.0.3_3306_20150630102812.binlog to root@192.168.0.5:/var/tmp/saved_master_binlog_from_192.168.0.3_3306_20150630102812.binlog succeeded.
Tue Jun 30 10:28:17 2015 - [info] Starting recovery on 192.168.0.5(192.168.0.5:3306)..
Tue Jun 30 10:28:17 2015 - [info] Generating diffs succeeded.
Tue Jun 30 10:28:17 2015 - [info] Waiting until all relay logs are applied.
Tue Jun 30 10:28:17 2015 - [info] done.
Tue Jun 30 10:28:17 2015 - [info] Getting slave status..
Tue Jun 30 10:28:17 2015 - [info] This slave(192.168.0.5)'s Exec_Master_Log_Pos equals to Read_Master_Log_Pos(mysql-bin.000009:120). No need to recover from Exec_Master_Log_Pos.
Tue Jun 30 10:28:17 2015 - [info] Connecting to the target slave host 192.168.0.5, running recover script..
Tue Jun 30 10:28:17 2015 - [info] Executing command: apply_diff_relay_logs --command=apply --slave_user='monitor' --slave_host=192.168.0.5 --slave_ip=192.168.0.5 --slave_port=3306 --apply_files=/var/tmp/saved_master_binlog_from_192.168.0.3_3306_20150630102812.binlog --workdir=/var/tmp --target_version=5.6.20-log --timestamp=20150630102812 --handle_raw_binlog=1 --disable_log_bin=0 --manager_version=0.54 --slave_pass=xxx
Tue Jun 30 10:28:17 2015 - [info]
MySQL client version is 5.6.20. Using --binary-mode.
Applying differential binary/relay log files /var/tmp/saved_master_binlog_from_192.168.0.3_3306_20150630102812.binlog on 192.168.0.5:3306. This may take long time...
Applying log files succeeded.
Tue Jun 30 10:28:17 2015 - [info] All relay logs were successfully applied.
Tue Jun 30 10:28:17 2015 - [info] Resetting slave 192.168.0.5(192.168.0.5:3306) and starting replication from the new master 192.168.0.4(192.168.0.4:3306)..
Tue Jun 30 10:28:18 2015 - [info] Executed CHANGE MASTER.
Tue Jun 30 10:28:18 2015 - [info] Slave started.
Tue Jun 30 10:28:18 2015 - [info] End of log messages from 192.168.0.5.
Tue Jun 30 10:28:18 2015 - [info] -- Slave recovery on host 192.168.0.5(192.168.0.5:3306) succeeded.
Tue Jun 30 10:28:18 2015 - [info] All new slave servers recovered successfully.
Tue Jun 30 10:28:18 2015 - [info]
Tue Jun 30 10:28:18 2015 - [info] * Phase 5: New master cleanup phase..
Tue Jun 30 10:28:18 2015 - [info]
Tue Jun 30 10:28:18 2015 - [info] Resetting slave info on the new master..
Tue Jun 30 10:28:18 2015 - [info] 192.168.0.4: Resetting slave info succeeded.
Tue Jun 30 10:28:18 2015 - [info] Master failover to 192.168.0.4(192.168.0.4:3306) completed successfully.
Tue Jun 30 10:28:18 2015 - [info]
----- Failover Report -----
app1: MySQL Master failover 192.168.0.3 to 192.168.0.4 succeeded
Master 192.168.0.3 is down!
Check MHA Manager logs at yaolansvr_slave:/var/log/manager.log for details.
Started automated(non-interactive) failover.
Invalidated master IP address on 192.168.0.3.
The latest slave 192.168.0.4(192.168.0.4:3306) has all relay logs for recovery.
Selected 192.168.0.4 as a new master.
192.168.0.4: OK: Applying all logs succeeded.
192.168.0.4: OK: Activated master IP address.
192.168.0.5: This host has the latest relay log events.
Generating relay diff files from the latest slave succeeded.
192.168.0.5: OK: Applying all logs succeeded. Slave started, replicating from 192.168.0.4.
192.168.0.4: Resetting slave info succeeded.
Master failover to 192.168.0.4(192.168.0.4:3306) completed successfully.
######192.168.0.4提升為主之后，查看狀態：
# masterha_check_status --conf=/etc/mha/app1/app1.cnf
app1 is stopped(2:NOT_RUNNING).
mysql> select @@read_only;
+-------------+
| @@read_only |
+-------------+
| 0 |
+-------------+
######修復宕機的機器
首先cat /var/log/manager.log|grep "All other slaves should start"確定change master命令，把宕掉的數據庫給啟動，登陸進去后，slave status為空，使用change master命令設置應用的主節點，啟動slave進程
然后設置read_only=1，最后檢查復制環境，并啟動mha manager的監控，并把# mysql -e "set global relay_log_purge=0"
192.168.0.4關閉mysql后，192.168.0.3提升為主的過程中報錯：
Tue Jun 30 11:50:37 2015 - [error][/usr/local/share/perl5/MHA/MasterFailover.pm, ln297] Last failover was done at 2015/06/30 10:05:18. Current time is too early to do failover again. If you want to do failover, manually remove /etc/mha/app1/app1.failover.complete and run this script again.
Tue Jun 30 11:50:37 2015 - [error][/usr/local/share/perl5/MHA/ManagerUtil.pm, ln178] Got ERROR: at /usr/local/bin/masterha_manager line 65
并且masterha_manager會立即死掉
注意：
（1）一旦重啟slave，記得需要將mysql -e "set global read_only=1"
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