高级运维mysql我爱编程

MHA构建MySQL高可用平台最佳实践

2017-11-21  本文已影响554人  BruceLiu1
图片来自网络

文/Bruce.Liu1

文章大纲

  1. MHA简介
    1.1. mha组件介绍
    1.2. 背景和目标
  2. MHA原理
    2.1. MHA工作原理
    2.2. MHA工具介绍
    2.3. 当前高可用方案
    2.4. MHA的优势
  3. MHA最佳实践
    3.1. 背景介绍
    3.2. 安装MySQL实例
    3.3. 部署MySQL复制
    3.4. 部署MHA软件
    3.5. 故障自动切换与在线切换

1.MHA简介

MHA是什么？
MHA是由日本Mysql yoshinorim专家（原就职于DeNA现就职于FaceBook）用Perl写的一套Mysql故障切换方案，来保障数据库的高可用性，它的功能是能在0-30s之内实现主Mysql故障转移（failover），MHA故障转移可以很好的帮我们解决从库数据的一致性问题，同时最大化挽回故障发生后数据的一致性。
官方网站：https://code.google.com/p/mysql-master-ha/

MHA（Master High Availability）目前在MySQL高可用方面是一个相对成熟的解决方案，它由日本DeNA公司youshimaton（现就职于Facebook公司）开发，是一套优秀的作为MySQL高可用性环境下故障切换和主从提升的高可用软件。在MySQL故障切换过程中，MHA能做到在0~30秒之内自动完成数据库的故障切换操作，并且在进行故障切换的过程中，MHA能在较大程度上保证数据的一致性，以达到真正意义上的高可用。

该软件由两部分组成：MHA Manager（管理节点）和MHA Node（数据节点）。MHA Manager可以单独部署在一台独立的机器上管理多个master-slave集群，也可以部署在一台slave节点上。MHA Node运行在每台MySQL服务器上，MHA Manager会定时探测集群中的master节点，当master出现故障时，它可以自动将数据的slave提升为新的master，然后将所有其他的slave重新指向新的master。整个故障转移过程对应用程序完全透明。

在MHA自动故障切换过程中，MHA试图从宕机的主服务器上保存二进制日志，较大程度的保证数据的不丢失，但这并不总是可行的。例如，如果主服务器硬件故障或无法通过ssh访问，MHA没法保存二进制日志，只进行故障转移而丢失了的数据。使用MySQL 5.5的半同步复制，可以大大降低数据丢失的风险。MHA可以与半同步复制结合起来。如果只有一个slave已经收到了的二进制日志，MHA可以将的二进制日志应用于其他所有的slave服务器上，因此可以保证所有节点的数据一致性。

1.1.mha组件介绍

1.2.背景和目标

在早期的MySQL架构中最主流就就是MySQL复制的主从结构，但伴随时间的推移以及数据的膨胀会出现一下几类问题。

2.MHA原理

2.1.MHA工作原理

image.png

当master出现故障时，通过对比slave之间I/O线程读取masterbinlog的位置，选取最接近的slave做为latestslave。 其它slave通过与latest slave对比生成差异中继日志。在latest slave上应用从master保存的binlog，同时将latest slave提升为master。最后在其它slave上应用相应的差异中继日志并开始从新的master开始复制。

在MHA实现Master故障切换过程中，MHA Node会试图访问故障的master（通过SSH），如果可以访问（不是硬件故障，比如InnoDB数据文件损坏等），会保存二进制文件，以最大程度保 证数据不丢失。MHA和半同步复制一起使用会大大降低数据丢失的危险。流程如下：

2.2.MHA工具介绍

1.Manager工具:

2. Node工具

2.3.当前高可用方案

2.4.MHA的优势

3.MHA最佳实践

图片来自网络

3.1.背景介绍

3.1.1.软件参考文档

参考文档：
MHA原理：https://code.google.com/p/mysql-master-ha/wiki/HowMHAWorks
MHA原理PPT：http://www.slideshare.net/matsunobu/automated-master-failover
Linux配置代理方法：http://blog.csdn.net/bojie5744/article/details/42148719

软件下载：
Centos Base Yum Repository： http://mirrors.163.com/.help/CentOS6-Base-163.repo
epel(RHEL 6)Yum Repository：http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm
MySQL5.7 Yum Repository：https://dev.mysql.com/get/mysql57-community-release-el6-11.noarch.rpm
mysql-master-ha(mgr)：https://github.com/linyue515/mysql-master-ha/raw/master/mha4mysql-manager-0.57-0.el7.noarch.rpm
mysql-master-ha(node)：https://github.com/linyue515/mysql-master-ha/raw/master/mha4mysql-node-0.57-0.el7.noarch.rpm

3.1.2.系统环境介绍
图片来自原创
3.1.3.安装系统要求
# /etc/init.d/NetworkManager stop
# chkconfig NetworkManager off
# /etc/init.d/iptables stop
# chkconfig iptables off

/etc/selinux/config 改成disable

3.2.安装MySQL实例

3.2.1.安装mysql数据库
# useradd mysql
# passwd mysql

# yum -y install mysql-community-server.x86_64
3.2.2.创建配置文件目录
# mkdir /etc/mysql
3.2.3.创建配置文件
[mysqld]
# GENERAL #
user                           = mysql
port                           = 3389
default_storage_engine         = InnoDB
socket                         = /data1/db3389/my3389.sock
pid_file                       = /data1/db3389/mysql.pid
#read-only =0
tmpdir                  = /data1/tmp
#key_buffer_size                = 128M
max_allowed_packet             = 32M
max_connect_errors             = 1000000
datadir          = /data1/db3389/
log_bin = 2171303389-bin
relay-log=  2171303389-relay-bin
expire_logs_days               = 7
#sync_binlog                    = 0
tmp_table_size                 = 32M
max_heap_table_size            = 32M
max_connections                = 5000
thread_cache_size              = 512
table_definition_cache         = 4096
table_open_cache               = 4096
wait_timeout            = 28800
interactive_timeout     = 28800
transaction-isolation = READ-COMMITTED
binlog-format=row
character-set-server=utf8
skip-name-resolve
back_log=1024
explicit_defaults_for_timestamp=true
server_id=2171303389

# INNODB #
innodb_flush_method            = O_DIRECT
#innodb_data_home_dir = /data1/db3389
innodb_data_file_path = ibdata1:100M:autoextend
#redo log
#innodb_log_group_home_dir=./
innodb_log_files_in_group      = 3
innodb_log_file_size           = 128M
#innodb performance
innodb_flush_log_at_trx_commit = 0
innodb_file_per_table          = 1
innodb_buffer_pool_instances   = 8
innodb_io_capacity             = 2000
innodb_lock_wait_timeout       = 30
binlog_error_action = ABORT_SERVER
innodb_buffer_pool_size        = 128M
innodb_max_dirty_pages_pct=90
innodb_file_format=Barracuda
innodb_support_xa=0
innodb_buffer_pool_dump_at_shutdown = 1
innodb_buffer_pool_load_at_startup = 1
#innodb undo log
innodb_undo_tablespaces=4
innodb_undo_logs=2048
innodb_purge_rseg_truncate_frequency=512
innodb_max_undo_log_size=2G
innodb_undo_log_truncate=1

log_error                      = error.log
#log_queries_not_using_indexes = 1
slow_query_log                 = 1
slow_query_log_file            = slow-queries.log
long_query_time=2
gtid_mode=ON
enforce-gtid-consistency
log-slave-updates
master-info-repository=TABLE
relay-log-info-repository=TABLE
sync_master_info = 10000
slave_sql_verify_checksum=1
skip-slave-start
init-connect='SET NAMES utf8'
character-set-server=utf8
skip-character-set-client-handshake
bind-address=0.0.0.0
skip-external-locking
slave-parallel-workers=6

[mysql5.6]
myisam_recover                 = FORCE,BACKUP
3.2.4.创建授权目录
# mkdir -p /data1/db3389
# mkdir -p /data1/tmp
# chown -R mysql:mysql /data1/db3389
# chown -R mysql:mysql /data1/tmp
3.2.5.初始化MySQL实例
# mysqld --defaults-file=/etc/mysql/my3389.cnf --initialize --user=mysql
# mysql_ssl_rsa_setup
3.2.6.启动mysql实例
# mysqld_safe --defaults-file=/etc/mysql/my3389.cnf &
# cat /data1/db3389/error.log | grep temp
# mysql -S /data1/db3389/my3389.sock -p'z&Di4b_oSM*-'
mysql> set password=''; #重置密码为空

3.3.部署MySQL复制

3.3.1.主库创建复制用户
mysql> grant replication slave, replication client on *.* to replica@'192.168.217.%' identified by 'mycatDBA';
3.3.2.主库创建mha用户
mysql> grant all privileges on *.* to mha@'192.168.217.132' identified by 'mysqlDBA';
3.3.3.主库备份数据库
# mysqldump -S /data1/db3389/my3389.sock --single-transaction --master-data=2 --opt -A | gzip >  /data1/tmp/full_3389.tar.gz
3.3.4.主库传输至从库
# scp /data1/tmp/full_3389.tar.gz 192.168.217.131:/data1/tmp
3.3.5.从库恢复数据库
# gunzip < /data1/tmp/full_3389.tar.gz | mysql -S /data1/db3389/my3389.sock

注意：恢复数据库前，从库最好reset master;，否则将出现一下错误：
ERROR 1840 (HY000) at line 24: @@GLOBAL.GTID_PURGED can only be set when @@GLOBAL.GTID_EXECUTED is empty.

3.3.6.从库初始化同步数据
mysql> change master to master_host='192.168.217.130',master_port=3389,master_user='replica',master_password='mycatDBA',master_auto_position=1;
Query OK, 0 rows affected, 2 warnings (0.02 sec)

mysql> start slave;
Query OK, 0 rows affected (0.03 sec)


mysql> show slave status \G
*************************** 1. row ***************************
...... 省略 ......
             Slave_IO_Running: Yes
            Slave_SQL_Running: Yes
...... 省略 ......

3.4.部署MHA软件

3.4.1.安装软件
# yum -y install perl-DBD-MySQL perl-Config-Tiny perl-Log-Dispatch perl-Parallel-ForkManager perl-Time-HiRes
# #根据MHA角色安装对应的软件包即可
# yum -y --nogpgcheck install mha4mysql-node-0.57-0.el7.noarch.rpm
# yum -y install --nogpgcheck mha4mysql-manager-0.57-0.el7.noarch.rpm

# yum -y --nogpgcheck install perl-DBD-MySQL*
# yum -y --nogpgcheck install perl-Config-Tiny*
# yum -y --nogpgcheck install perl-Parallel-ForkManager*
# yum -y --nogpgcheck install  perl-MailTools*
# yum -y --nogpgcheck install perl-Email-Date-Format*
# yum -y --nogpgcheck install perl-Mail-Sender*
# yum -y --nogpgcheck install perl-MIME-Types*
# yum -y --nogpgcheck install perl-MIME-Lite*
# yum -y --nogpgcheck install perl-Mail-Sendmail*
# yum -y --nogpgcheck install perl-Log-Dispatch*
# #根据MHA角色安装对应的软件包即可 
# yum -y --nogpgcheck install mha4mysql-node-0.57-0.el7.noarch.rpm
# yum -y install --nogpgcheck mha4mysql-manager-0.57-0.el7.noarch.rpm
3.4.2.挂在VIP
# /sbin/ifconfig eth0:1 192.168.217.201 broadcast 192.168.217.255 netmask 255.255.255.0
# /sbin/arping -f -q -c 5 -w 5 -I eth0 -s 192.168.217.201 -U 192.168.217.2
3.4.3.配置SSH互信

在现网环境中几乎都是禁止root远程登陆服务器得，所以ssh免密码登陆要在mysql用户下进行配置，这是处于安全角度考虑出发。

# su - mysql
$ ssh-keygen -t rsa
$ rm -rf ~/.ssh/*

# su - mysql
$ ssh-keygen -t rsa
$ rm -rf ~/.ssh/*

# su - mysql
$ ssh-keygen -t rsa
$ cd ~/.ssh
$ mv id_rsa.pub authorized_keys
$ scp * 192.168.217.130:~/.ssh/
$ scp * 192.168.217.131:~/.ssh/
$ #测试ssh
$ ssh 192.168.217.130 date 
Wed Nov 22 05:48:54 PST 2017
$ ssh 192.168.217.131 date 
Wed Nov 22 05:47:58 PST 2017
3.4.4.配置mysql用户sudo权限
# vim /etc/sudoers

#将以下的参数注释,意思就是sudo默认需要tty终端。注释掉就可以在后台执行了。
#Defaults    requiretty

# cd /etc/sudoers.d/
# vim mysql

User_Alias  MYSQL_USERS = ALL
Runas_Alias MYSQL_RUNAS = root
Cmnd_Alias  MYSQL_CMNDS = ALL
MYSQL_USERS ALL = (MYSQL_RUNAS) NOPASSWD: MYSQL_CMNDS
3.4.5.创建MHA配置文件
# mkdir /etc/mha

# cat app3389.cnf 
[server default]
user=mha
password=mysqlDBA
manager_workdir=/data1/mha/masterha/app3389
manager_log=/data1/mha/masterha/app3389/app3389.log
remote_workdir=/data1/mha/masterha/app3389
ssh_user=mysql
repl_user=replica    
repl_password=mycatDBA
ping_interval=3         

secondary_check_script="masterha_secondary_check -s 192.168.1.122 -s 192.168.1.122"
master_ip_failover_script="/etc/mha/master_ip_failover.sh 192.168.1.201 1"
master_ip_online_change_script="/etc/mha/master_ip_online_change.sh 192.168.1.201 1"
shutdown_script="/etc/mha/power_manager"
#report_script="/etc/mha/end_report"

[server1]
hostname=192.168.1.120
port=3389
master_binlog_dir=/data1/db3389
candidate_master=1   
master_pid_file=/data1/db3389/mysql.pid               

[server2]
hostname=192.168.1.121
port=3389
master_binlog_dir=/data1/db3389
candidate_master=1
master_pid_file=/data1/db3389/mysql.pid    

[binlog1]
hostname=192.168.1.122
master_binlog_dir=/data1/mha/binlog/3389
no_master=1
ignore_fail=1
3.4.6.上传MHA切换脚本

master_ip_failover.sh
master_ip_online_change.sh
power_manager

注意：脚本内容中要修改网卡名字

my $vip  = shift;
my $interface = 'eth1';
my $key = shift;

# chmod 755 master_ip_*
# chmod 755 power_manager
3.4.7.创建MHA、BINLOG工作目录
# mkdir -p /data1/mha/masterha/app3389
# mkdir -p /data1/mha/binlog/3389
# chown -R mysql:mysql /data1/mha/binlog/3389
3.4.8.启动BINLOG SERVER
# su - mysql
$ cd /data1/mha/binlog/3389;
$ mysqlbinlog -R --host=192.168.217.130 -P3389 --user=mha --password=mysqlDBA  --raw --stop-never 2171303389-bin.000003 &
$ ps -ef | grep mysqlbinlog | grep -v grep  # 验证binlog server进程是否存在
root       7008   6233  0 07:00 pts/0    00:00:00 mysqlbinlog -R --host=192.168.217.130 -P3389 --user=mha --password=x xxxxxx --raw --stop-never 2171303389-bin.000003
3.4.9.验证并启动manager进程
$ masterha_check_ssh --conf=/etc/mha/app3389.cnf 
Wed Nov 22 07:35:07 2017 - [warning] Global configuration file /etc/masterha_default.cnf not found. Skipping.
Wed Nov 22 07:35:07 2017 - [info] Reading application default configuration from /etc/mha/app3389.cnf..
Wed Nov 22 07:35:07 2017 - [info] Reading server configuration from /etc/mha/app3389.cnf..
Wed Nov 22 07:35:07 2017 - [info] Starting SSH connection tests..
Wed Nov 22 07:35:08 2017 - [debug] 
Wed Nov 22 07:35:07 2017 - [debug]  Connecting via SSH from root@192.168.217.130(192.168.217.130:22) to root@192.168.217.131(192.168.217.131:22)..
Wed Nov 22 07:35:08 2017 - [debug]   ok.
Wed Nov 22 07:35:08 2017 - [debug] 
Wed Nov 22 07:35:07 2017 - [debug]  Connecting via SSH from root@192.168.217.131(192.168.217.131:22) to root@192.168.217.130(192.168.217.130:22)..
Wed Nov 22 07:35:08 2017 - [debug]   ok.
Wed Nov 22 07:35:08 2017 - [info] All SSH connection tests passed successfully.

$ masterha_check_repl --conf=/etc/mha/app3389.cnf 
Wed Nov 22 07:47:07 2017 - [warning] Global configuration file /etc/masterha_default.cnf not found. Skipping.
Wed Nov 22 07:47:07 2017 - [info] Reading application default configuration from /etc/mha/app3389.cnf..
Wed Nov 22 07:47:07 2017 - [info] Reading server configuration from /etc/mha/app3389.cnf..
Wed Nov 22 07:47:07 2017 - [info] MHA::MasterMonitor version 0.57.
Wed Nov 22 07:47:08 2017 - [info] GTID failover mode = 1
Wed Nov 22 07:47:08 2017 - [info] Dead Servers:
Wed Nov 22 07:47:08 2017 - [info] Alive Servers:
Wed Nov 22 07:47:08 2017 - [info]   192.168.217.130(192.168.217.130:3389)
Wed Nov 22 07:47:08 2017 - [info]   192.168.217.131(192.168.217.131:3389)
Wed Nov 22 07:47:08 2017 - [info] Alive Slaves:
Wed Nov 22 07:47:08 2017 - [info]   192.168.217.131(192.168.217.131:3389)  Version=5.7.20-log (oldest major version between slaves) log-bin:enabled
Wed Nov 22 07:47:08 2017 - [info]     GTID ON
Wed Nov 22 07:47:08 2017 - [info]     Replicating from 192.168.217.130(192.168.217.130:3389)
Wed Nov 22 07:47:08 2017 - [info]     Primary candidate for the new Master (candidate_master is set)
Wed Nov 22 07:47:08 2017 - [info] Current Alive Master: 192.168.217.130(192.168.217.130:3389)
Wed Nov 22 07:47:08 2017 - [info] Checking slave configurations..
Wed Nov 22 07:47:08 2017 - [info]  read_only=1 is not set on slave 192.168.217.131(192.168.217.131:3389).
Wed Nov 22 07:47:08 2017 - [info] Checking replication filtering settings..
Wed Nov 22 07:47:08 2017 - [info]  binlog_do_db= , binlog_ignore_db= 
Wed Nov 22 07:47:08 2017 - [info]  Replication filtering check ok.
Wed Nov 22 07:47:08 2017 - [info] GTID (with auto-pos) is supported. Skipping all SSH and Node package checking.
Warning: Permanently added '192.168.217.132' (RSA) to the list of known hosts.
Wed Nov 22 07:47:08 2017 - [info] HealthCheck: SSH to 192.168.217.132 is reachable.
Wed Nov 22 07:47:14 2017 - [info] Binlog server 192.168.217.132 is reachable.
Wed Nov 22 07:47:14 2017 - [info] Checking recovery script configurations on 192.168.217.132(192.168.217.132:3306)..
Wed Nov 22 07:47:14 2017 - [info]   Executing command: save_binary_logs --command=test --start_pos=4 --binlog_dir=/data1/mha/binlog/3389 --output_file=/data1/mha/masterha/app3389/save_binary_logs_test --manager_version=0.57 --start_file=2171303389-bin.000003 
Wed Nov 22 07:47:14 2017 - [info]   Connecting to root@192.168.217.132(192.168.217.132:22).. 
  Creating /data1/mha/masterha/app3389 if not exists..    ok.
  Checking output directory is accessible or not..
   ok.
  Binlog found at /data1/mha/binlog/3389, up to 2171303389-bin.000003
Wed Nov 22 07:47:14 2017 - [info] Binlog setting check done.
Wed Nov 22 07:47:14 2017 - [info] Checking SSH publickey authentication settings on the current master..
Wed Nov 22 07:47:15 2017 - [info] HealthCheck: SSH to 192.168.217.130 is reachable.
Wed Nov 22 07:47:15 2017 - [info] 
192.168.217.130(192.168.217.130:3389) (current master)
 +--192.168.217.131(192.168.217.131:3389)

Wed Nov 22 07:47:15 2017 - [info] Checking replication health on 192.168.217.131..
Wed Nov 22 07:47:15 2017 - [info]  ok.
Wed Nov 22 07:47:15 2017 - [info] Checking master_ip_failover_script status:
Wed Nov 22 07:47:15 2017 - [info]   /etc/mha/master_ip_failover.sh 192.168.217.201  1 --command=status --ssh_user=root --orig_master_host=192.168.217.130 --orig_master_ip=192.168.217.130 --orig_master_port=3389 
Checking the Status of the script.. OK 
Wed Nov 22 07:47:15 2017 - [info]  OK.
Wed Nov 22 07:47:15 2017 - [info] Checking shutdown script status:
Wed Nov 22 07:47:15 2017 - [info]   /etc/mha/power_manager --command=status --ssh_user=root --host=192.168.217.130 --ip=192.168.217.130 
Wed Nov 22 07:47:15 2017 - [info]  OK.
Wed Nov 22 07:47:15 2017 - [info] Got exit code 0 (Not master dead).

MySQL Replication Health is OK.

$ nohup masterha_manager --conf=/etc/mha/app3389.cnf --ignore_last_failover &
[2] 7307
$ nohup: ignoring input and appending output to `nohup.out'

$ masterha_check_status --conf=/etc/mha/app3389.cnf 
app3389 (pid:7307) is running(0:PING_OK), master:192.168.217.130

3.5.故障自动切换与在线切换

3.5.1.故障切换
3.5.2.在线切换

在线切换(Mha manager进程(binlog server进程可选)是关闭的,Mha结构是正常的环境,适用于生产系统硬件、软件升级维护等场景)

注意：在备库先执行DDL,一般先stop slave,一般不记录mysql日志,可以通过set session sql_log_bin=0实现,然后进行一次主备切换操作,再在原来的主库上执行DDL.这种方法适用于增减索引.

$ masterha_master_switch --master_state=alive --conf=/etc/mha/app3389.conf --orig_master_is_new_slave
Sat Nov 25 11:06:04 2017 - [info] MHA::MasterRotate version 0.57.
Sat Nov 25 11:06:04 2017 - [info] Starting online master switch..
Sat Nov 25 11:06:04 2017 - [info] 
Sat Nov 25 11:06:04 2017 - [info] * Phase 1: Configuration Check Phase..
Sat Nov 25 11:06:04 2017 - [info] 
Sat Nov 25 11:06:04 2017 - [warning] Global configuration file /etc/masterha_default.cnf not found. Skipping.
Sat Nov 25 11:06:04 2017 - [info] Reading application default configuration from /etc/mha/app3389.conf..
Sat Nov 25 11:06:04 2017 - [info] Reading server configuration from /etc/mha/app3389.conf..
Sat Nov 25 11:06:04 2017 - [info] GTID failover mode = 1
Sat Nov 25 11:06:04 2017 - [info] Current Alive Master: 192.168.1.121(192.168.1.121:3389)
Sat Nov 25 11:06:04 2017 - [info] Alive Slaves:
Sat Nov 25 11:06:04 2017 - [info]   192.168.1.120(192.168.1.120:3389)  Version=5.7.20-log (oldest major version between slaves) log-bin:enabled
Sat Nov 25 11:06:04 2017 - [info]     GTID ON
Sat Nov 25 11:06:04 2017 - [info]     Replicating from 192.168.1.121(192.168.1.121:3389)
Sat Nov 25 11:06:04 2017 - [info]     Primary candidate for the new Master (candidate_master is set)

It is better to execute FLUSH NO_WRITE_TO_BINLOG TABLES on the master before switching. Is it ok to execute on 192.168.1.121(192.168.1.121:3389)? (YES/no): YES
Sat Nov 25 11:06:07 2017 - [info] Executing FLUSH NO_WRITE_TO_BINLOG TABLES. This may take long time..
Sat Nov 25 11:06:07 2017 - [info]  ok.
Sat Nov 25 11:06:07 2017 - [info] Checking MHA is not monitoring or doing failover..
Sat Nov 25 11:06:07 2017 - [info] Checking replication health on 192.168.1.120..
Sat Nov 25 11:06:07 2017 - [info]  ok.
Sat Nov 25 11:06:07 2017 - [info] Searching new master from slaves..
Sat Nov 25 11:06:07 2017 - [info]  Candidate masters from the configuration file:
Sat Nov 25 11:06:07 2017 - [info]   192.168.1.120(192.168.1.120:3389)  Version=5.7.20-log (oldest major version between slaves) log-bin:enabled
Sat Nov 25 11:06:07 2017 - [info]     GTID ON
Sat Nov 25 11:06:07 2017 - [info]     Replicating from 192.168.1.121(192.168.1.121:3389)
Sat Nov 25 11:06:07 2017 - [info]     Primary candidate for the new Master (candidate_master is set)
Sat Nov 25 11:06:07 2017 - [info]   192.168.1.121(192.168.1.121:3389)  Version=5.7.20-log log-bin:enabled
Sat Nov 25 11:06:07 2017 - [info]     GTID ON
Sat Nov 25 11:06:07 2017 - [info]  Non-candidate masters:
Sat Nov 25 11:06:07 2017 - [info]  Searching from candidate_master slaves which have received the latest relay log events..
Sat Nov 25 11:06:07 2017 - [info] 
From:
192.168.1.121(192.168.1.121:3389) (current master)
 +--192.168.1.120(192.168.1.120:3389)

To:
192.168.1.120(192.168.1.120:3389) (new master)
 +--192.168.1.121(192.168.1.121:3389)

Starting master switch from 192.168.1.121(192.168.1.121:3389) to 192.168.1.120(192.168.1.120:3389)? (yes/NO): YES
Sat Nov 25 11:06:11 2017 - [info] Checking whether 192.168.1.120(192.168.1.120:3389) is ok for the new master..
Sat Nov 25 11:06:11 2017 - [info]  ok.
Sat Nov 25 11:06:11 2017 - [info] 192.168.1.121(192.168.1.121:3389): SHOW SLAVE STATUS returned empty result. To check replication filtering rules, temporarily executing CHANGE MASTER to a dummy host.
Sat Nov 25 11:06:11 2017 - [info] 192.168.1.121(192.168.1.121:3389): Resetting slave pointing to the dummy host.
Sat Nov 25 11:06:11 2017 - [info] ** Phase 1: Configuration Check Phase completed.
Sat Nov 25 11:06:11 2017 - [info] 
Sat Nov 25 11:06:11 2017 - [info] * Phase 2: Rejecting updates Phase..
Sat Nov 25 11:06:11 2017 - [info] 
Sat Nov 25 11:06:11 2017 - [info] Executing master ip online change script to disable write on the current master:
Sat Nov 25 11:06:11 2017 - [info]   /etc/mha/master_ip_online_change.sh 192.168.1.200 1 --command=stop --orig_master_host=192.168.1.121 --orig_master_ip=192.168.1.121 --orig_master_port=3389 --orig_master_user='mha' --new_master_host=192.168.1.120 --new_master_ip=192.168.1.120 --new_master_port=3389 --new_master_user='mha' --orig_master_ssh_user=mysql --new_master_ssh_user=mysql   --orig_master_is_new_slave --orig_master_password=xxx --new_master_password=xxx
Unknown option: orig_master_ssh_user
Unknown option: new_master_ssh_user
Unknown option: orig_master_is_new_slave
Sat Nov 25 11:06:11 2017 918769 Set read_only on the new master.. ok.
Sat Nov 25 11:06:11 2017 923401 Waiting all running 1 threads are disconnected.. (max 1500 milliseconds)
{'Time' => '78','Command' => 'Binlog Dump GTID','db' => undef,'Id' => '46','Info' => undef,'User' => 'replica','State' => 'Master has sent all binlog to slave; waiting for more updates','Host' => '192.168.1.120:39100'}
Sat Nov 25 11:06:12 2017 426422 Waiting all running 1 threads are disconnected.. (max 1000 milliseconds)
{'Time' => '79','Command' => 'Binlog Dump GTID','db' => undef,'Id' => '46','Info' => undef,'User' => 'replica','State' => 'Master has sent all binlog to slave; waiting for more updates','Host' => '192.168.1.120:39100'}
Sat Nov 25 11:06:12 2017 929834 Waiting all running 1 threads are disconnected.. (max 500 milliseconds)
{'Time' => '79','Command' => 'Binlog Dump GTID','db' => undef,'Id' => '46','Info' => undef,'User' => 'replica','State' => 'Master has sent all binlog to slave; waiting for more updates','Host' => '192.168.1.120:39100'}
Sat Nov 25 11:06:13 2017 433392 Set read_only=1 on the orig master.. ok.
Sat Nov 25 11:06:13 2017 436292 Waiting all running 1 queries are disconnected.. (max 500 milliseconds)
{'Time' => '80','Command' => 'Binlog Dump GTID','db' => undef,'Id' => '46','Info' => undef,'User' => 'replica','State' => 'Master has sent all binlog to slave; waiting for more updates','Host' => '192.168.1.120:39100'}
Disabling the VIP on old master: 192.168.1.121 
===========sudo /sbin/ifconfig eth1:1 down===========================
Sat Nov 25 11:06:14 2017 071486 Killing all application threads..
Sat Nov 25 11:06:14 2017 072793 done.
Sat Nov 25 11:06:14 2017 - [info]  ok.
Sat Nov 25 11:06:14 2017 - [info] Locking all tables on the orig master to reject updates from everybody (including root):
Sat Nov 25 11:06:14 2017 - [info] Executing FLUSH TABLES WITH READ LOCK..
Sat Nov 25 11:06:14 2017 - [info]  ok.
Sat Nov 25 11:06:14 2017 - [info] Orig master binlog:pos is 11213389-bin.000003:194.
Sat Nov 25 11:06:14 2017 - [info]  Waiting to execute all relay logs on 192.168.1.120(192.168.1.120:3389)..
Sat Nov 25 11:06:14 2017 - [info]  master_pos_wait(11213389-bin.000003:194) completed on 192.168.1.120(192.168.1.120:3389). Executed 0 events.
Sat Nov 25 11:06:14 2017 - [info]   done.
Sat Nov 25 11:06:14 2017 - [info] Getting new master's binlog name and position..
Sat Nov 25 11:06:14 2017 - [info]  11203389-bin.000003:346
Sat Nov 25 11:06:14 2017 - [info]  All other slaves should start replication from here. Statement should be: CHANGE MASTER TO MASTER_HOST='192.168.1.120', MASTER_PORT=3389, MASTER_AUTO_POSITION=1, MASTER_USER='replica', MASTER_PASSWORD='xxx';
Sat Nov 25 11:06:14 2017 - [info] Executing master ip online change script to allow write on the new master:
Sat Nov 25 11:06:14 2017 - [info]   /etc/mha/master_ip_online_change.sh 192.168.1.200 1 --command=start --orig_master_host=192.168.1.121 --orig_master_ip=192.168.1.121 --orig_master_port=3389 --orig_master_user='mha' --new_master_host=192.168.1.120 --new_master_ip=192.168.1.120 --new_master_port=3389 --new_master_user='mha' --orig_master_ssh_user=mysql --new_master_ssh_user=mysql   --orig_master_is_new_slave --orig_master_password=xxx --new_master_password=xxx
Unknown option: orig_master_ssh_user
Unknown option: new_master_ssh_user
Unknown option: orig_master_is_new_slave
Sat Nov 25 11:06:14 2017 186596 Set read_only=0 on the new master.
Enabling the VIP - 192.168.1.200 on the new master - 192.168.1.120 
===========sudo /sbin/ifconfig eth1:1 192.168.1.200 broadcast 192.168.1.255 netmask 255.255.255.0 && sudo /sbin/arping -f -q -c 5 -w 5 -I eth1 -s 192.168.1.200  -U 192.168.1.1===========================
Sat Nov 25 11:06:14 2017 - [info]  ok.
Sat Nov 25 11:06:14 2017 - [info] 
Sat Nov 25 11:06:14 2017 - [info] * Switching slaves in parallel..
Sat Nov 25 11:06:14 2017 - [info] 
Sat Nov 25 11:06:14 2017 - [info] Unlocking all tables on the orig master:
Sat Nov 25 11:06:14 2017 - [info] Executing UNLOCK TABLES..
Sat Nov 25 11:06:14 2017 - [info]  ok.
Sat Nov 25 11:06:14 2017 - [info] Starting orig master as a new slave..
Sat Nov 25 11:06:14 2017 - [info]  Resetting slave 192.168.1.121(192.168.1.121:3389) and starting replication from the new master 192.168.1.120(192.168.1.120:3389)..
Sat Nov 25 11:06:14 2017 - [info]  Executed CHANGE MASTER.
Sat Nov 25 11:06:14 2017 - [info]  Slave started.
Sat Nov 25 11:06:14 2017 - [info] All new slave servers switched successfully.
Sat Nov 25 11:06:14 2017 - [info] 
Sat Nov 25 11:06:14 2017 - [info] * Phase 5: New master cleanup phase..
Sat Nov 25 11:06:14 2017 - [info] 
Sat Nov 25 11:06:14 2017 - [info]  192.168.1.120: Resetting slave info succeeded.
Sat Nov 25 11:06:14 2017 - [info] Switching master to 192.168.1.120(192.168.1.120:3389) completed successfully.

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