Mysql-MHA高可用實驗測試

時間  2019-11-29
標籤 mysql mha 可用 實驗 測試 欄目 MySQL 简体版
原文   原文鏈接

說明：
node

centos 6.5  mysql 5.5.37  mha4mysql-manager-0.55  mha4mysql-node-0.54mysql

manager 192.168.1.1   mha-manager管理端
db1 192.168.1.2           現有主庫
db2 192.168.1.3           即將作雙主的數據庫
db3 192.168.1.4           現有從庫
linux


配置mysql主從
db1主庫:sql

server-id = 1
log-bin=mysql-bin
binlog_format=mixed數據庫

db2主庫:vim

server-id = 2
log-bin=mysql-bin
binlog_format=mixedcentos

relay_log_purge=0bash

db3從庫:
server_id   = 3app

log_bin    = mysql-binless

relay_log    = mysql-relay-bin

max_relay_log_size = 2G

log_slave_updates = 1
read_only   = 1

relay_log_purge=0

db1主    (現有的主庫)

grant replication slave on *.* to mharep@'192.168.1.%' identified by 'passwd';
flush privileges;
stop slave;
#設置複製權限賬號
GRANT ALL PRIVILEGES ON *.* TO 'mha_manager'@'192.168.1.%' IDENTIFIED BY '123456';
reset master;
show master status\G

db2備  (即將作雙主的這臺機)

grant replication slave on *.* to mharep@'192.168.1.%' identified by 'passwd';
GRANT ALL PRIVILEGES ON *.* TO 'mha_manager'@'192.168.1.%' IDENTIFIED BY '123456';
flush privileges;
reset master;
slave stop;
change master to MASTER_HOST='192.168.1.2', MASTER_PORT=3306,MASTER_USER='mharep', MASTER_PASSWORD='passwd',master_log_file='mysql-bin.000001', master_log_pos=107;
slave start;
show slave status\G;

db3從  (現有的從庫)

reset master;
slave stop;
GRANT ALL PRIVILEGES ON *.* TO 'mha_manager'@'192.168.1.%' IDENTIFIED BY '123456';
flush privileges;
change master to MASTER_HOST='192.168.1.2', MASTER_PORT=3306,MASTER_USER='mharep', MASTER_PASSWORD='passwd',master_log_file='mysql-bin.000001', master_log_pos=107;
slave start;
show slave status\G;


配置雙機互信
manager

ssh-keygen -t rsa
for i in db1 db2 db3;do ssh-copy-id -i ~/.ssh/id_rsa.pub root@$i;done

db1主

ssh-keygen -t rsa 
for i in manager db2 db3;do ssh-copy-id -i ~/.ssh/id_rsa.pub root@$i;done

db2備 和 db3從 配置略

/usr/sbin/ntpdate 132.163.4.101   請把時間同步


安裝mysql-MHA
https://downloads.mariadb.com/files/MHA

wget https://downloads.mariadb.com/files/MHA/mha4mysql-manager-0.55-0.el6.noarch.rpm
wget https://downloads.mariadb.com/files/MHA/mha4mysql-node-0.54-0.el6.noarch.rpm

db1主 db2備 db3從
yum install perl-DBD-MySQL
yum localinstall mha4mysql-node-0.54-0.el6.noarch.rpm

 

manager

yum install perl cpan
yum install perl-DBD-MySQL perl-Config-Tiny perl-Log-Dispatch perl-Parallel-ForkManager

#這兩個yum沒有安裝上 perl-Log-Dispatch perl-Parallel-ForkManager 

wget http://rpmfind.net/linux/dag/redhat/el6/en/x86_64/dag/RPMS/perl-Log-Dispatch-2.26-1.el6.rf.noarch.rpm
wget ftp://rpmfind.net/linux/dag/redhat/el6/en/x86_64/dag/RPMS/perl-Parallel-ForkManager-0.7.5-2.2.el6.rf.noarch.rpm
wget ftp://rpmfind.net/linux/dag/redhat/el6/en/x86_64/dag/RPMS/perl-Mail-Sender-0.8.16-1.el6.rf.noarch.rpm
wget ftp://rpmfind.net/linux/dag/redhat/el6/en/x86_64/dag/RPMS/perl-Mail-Sendmail-0.79-1.2.el6.rf.noarch.rpm
rpm -ivh perl-Mail-Sender-0.8.16-1.el6.rf.noarch.rpm 
rpm -ivh perl-Mail-Sendmail-0.79-1.2.el6.rf.noarch.rpm
yum localinstall perl-Log-Dispatch-2.26-1.el6.rf.noarch.rpm
yum localinstall perl-Parallel-ForkManager-0.7.5-2.2.el6.rf.noarch.rpm
yum localinstall mha4mysql-node-0.54-0.el6.noarch.rpm
yum localinstall mha4mysql-manager-0.55-0.el6.noarch.rpm

配置mysql-MHA

[root@manager ~]# masterha_<Tab>
masterha_check_repl       masterha_conf_host        masterha_master_switch
masterha_check_ssh        masterha_manager          masterha_secondary_check
masterha_check_status     masterha_master_monitor   masterha_stop
tar -xzf mha4mysql-manager-0.55.tar.gz  #
ls mha4mysql-manager-0.55/samples/conf  #你們瞭解mha自帶的配置文件,可忽略
masterha_default.cnf    app1.cnf
mkdir -p /usr/local/mha/scripts
cp mha4mysql-manager-0.55/samples/scripts/* /usr/local/mha/scripts
[root@manager ~]# vim /usr/local/mha/mha.conf #根據本身的mysql配置改動
[server default]
user=mha_manager                              #mha管理的用戶名
password=123456
manager_workdir=/usr/local/mha
manager_log=/usr/local/mha/manager.log
remote_workdir=/usr/local/mha
ssh_user=root                                #上面雙機互信的用戶
repl_user=mharep                             #mysql複製(同步)的用戶名
repl_password=passwd
ping_interval=1
 
#下面是mysql檢測設置
secondary_check_script= masterha_secondary_check -s 192.168.1.2 -s 192.168.1.3 -s 192.168.1.4
#master_ip_failover_script=/usr/local/mha/scripts/master_ip_failover
#shutdown_script= /usr/local/mha/scripts/power_manager
report_script= /usr/local/mha/scripts/send_report
master_ip_online_change_script= /usr/local/mha/scripts/master_ip_online_change
 
[server1]
hostname=192.168.1.2     #寫ip或者主機名均可以
ssh_port=22
master_binlog_dir=/var/mysql/log
candidate_master=1
[server2]
hostname=192.168.1.3
ssh_port=22
master_binlog_dir=/var/mysql/log
candidate_master=1
[server3]
hostname=192.168.1.4
ssh_port=22
master_binlog_dir=/var/mysql/log
no_master=1


#驗證ssh通信
masterha_check_ssh  --conf=/usr/local/mha/mha.conf

wKioL1SueDOSfVm9AAZR6Nm0jAQ282.jpg

 

#驗證mysql複製

wget ftp://rpmfind.net/linux/dag/redhat/el6/en/x86_64/extras/RPMS/perl-Net-Telnet-3.03-2.el6.rfx.noarch.rpm
yum localinstall perl-Net-Telnet-3.03-2.el6.rfx.noarch.rpm

   

#mysql必須都啓動

[root@manager ~]# masterha_check_repl --conf=/usr/local/mha/mha.conf 
Thu Jan  8 18:05:40 2015 - [warning] Global configuration file /etc/masterha_default.cnf not found. Skipping.
Thu Jan  8 18:05:40 2015 - [info] Reading application default configurations from /usr/local/mha/mha.conf..
Thu Jan  8 18:05:40 2015 - [info] Reading server configurations from /usr/local/mha/mha.conf..
Thu Jan  8 18:05:40 2015 - [info] MHA::MasterMonitor version 0.55.
Thu Jan  8 18:05:40 2015 - [info] Dead Servers:
Thu Jan  8 18:05:40 2015 - [info] Alive Servers:
Thu Jan  8 18:05:40 2015 - [info]   192.168.1.2(192.168.1.2:3306)
Thu Jan  8 18:05:40 2015 - [info]   192.168.1.3(192.168.1.3:3306)
Thu Jan  8 18:05:40 2015 - [info]   192.168.1.4(192.168.1.4:3306)
Thu Jan  8 18:05:40 2015 - [info] Alive Slaves:
Thu Jan  8 18:05:40 2015 - [info]   192.168.1.3(192.168.1.3:3306)  Version=5.5.37-log (oldest major version between slaves) log-bin:enabled
Thu Jan  8 18:05:40 2015 - [info]     Replicating from 192.168.1.2(192.168.1.2:3306)
Thu Jan  8 18:05:40 2015 - [info]     Primary candidate for the new Master (candidate_master is set)
Thu
 Jan  8 18:05:40 2015 - [info]   192.168.1.4(192.168.1.4:3306)  
Version=5.5.37-log (oldest major version between slaves) log-bin:enabled
Thu Jan  8 18:05:40 2015 - [info]     Replicating from 192.168.1.2(192.168.1.2:3306)
Thu Jan  8 18:05:40 2015 - [info]     Not candidate for the new Master (no_master is set)
Thu Jan  8 18:05:40 2015 - [info] Current Alive Master: 192.168.1.2(192.168.1.2:3306)
Thu Jan  8 18:05:40 2015 - [info] Checking slave configurations..
Thu Jan  8 18:05:40 2015 - [info] Checking replication filtering settings..
Thu Jan  8 18:05:40 2015 - [info]  binlog_do_db= , binlog_ignore_db= 
Thu Jan  8 18:05:40 2015 - [info]  Replication filtering check ok.
Thu Jan  8 18:05:40 2015 - [info] Starting SSH connection tests..
Thu Jan  8 18:05:41 2015 - [info] All SSH connection tests passed successfully.
Thu Jan  8 18:05:41 2015 - [info] Checking MHA Node version..
Thu Jan  8 18:05:42 2015 - [info]  Version check ok.
Thu Jan  8 18:05:42 2015 - [info] Checking SSH publickey authentication settings on the current master..
Thu Jan  8 18:05:42 2015 - [info] HealthCheck: SSH to 192.168.1.2 is reachable.
Thu Jan  8 18:05:42 2015 - [info] Master MHA Node version is 0.54.
Thu Jan  8 18:05:42 2015 - [info] Checking recovery script configurations on the current master..
Thu
 Jan  8 18:05:42 2015 - [info]   Executing command: save_binary_logs 
--command=test --start_pos=4 --binlog_dir=/var/mysql/log 
--output_file=/usr/local/mha/save_binary_logs_test 
--manager_version=0.55 --start_file=mysql-bin.000002 
Thu Jan  8 18:05:42 2015 - [info]   Connecting to root@192.168.1.2(192.168.1.2).. 
  Creating /usr/local/mha if not exists..    ok.
  Checking output directory is accessible or not..
   ok.
  Binlog found at /var/mysql/log, up to mysql-bin.000002
Thu Jan  8 18:05:42 2015 - [info] Master setting check done.
Thu
 Jan  8 18:05:42 2015 - [info] Checking SSH publickey authentication and
 checking recovery script configurations on all alive slave servers..
Thu
 Jan  8 18:05:42 2015 - [info]   Executing command : 
apply_diff_relay_logs --command=test --slave_user='mha_manager' 
--slave_host=192.168.1.3 --slave_ip=192.168.1.3 --slave_port=3306 
--workdir=/usr/local/mha --target_version=5.5.37-log 
--manager_version=0.55 --relay_log_info=/var/mysql/data/relay-log.info  
--relay_dir=/var/mysql/data/  --slave_pass=xxx
Thu Jan  8 18:05:42 2015 - [info]   Connecting to root@192.168.1.3(192.168.1.3:22).. 
  Checking slave recovery environment settings..
    Opening /var/mysql/data/relay-log.info ... ok.
    Relay log found at /var/mysql/data, up to mysql-relay-bin.000007
    Temporary relay log file is /var/mysql/data/mysql-relay-bin.000007
    Testing mysql connection and privileges.. done.
    Testing mysqlbinlog output.. done.
    Cleaning up test file(s).. done.
Thu
 Jan  8 18:05:42 2015 - [info]   Executing command : 
apply_diff_relay_logs --command=test --slave_user='mha_manager' 
--slave_host=192.168.1.4 --slave_ip=192.168.1.4 --slave_port=3306 
--workdir=/usr/local/mha --target_version=5.5.37-log 
--manager_version=0.55 --relay_log_info=/var/mysql/data/relay-log.info  
--relay_dir=/var/mysql/data/  --slave_pass=xxx
Thu Jan  8 18:05:42 2015 - [info]   Connecting to root@192.168.1.4(192.168.1.4:22).. 
  Checking slave recovery environment settings..
    Opening /var/mysql/data/relay-log.info ... ok.
    Relay log found at /var/mysql/data, up to mysql-relay-bin.000006
    Temporary relay log file is /var/mysql/data/mysql-relay-bin.000006
    Testing mysql connection and privileges.. done.
    Testing mysqlbinlog output.. done.
    Cleaning up test file(s).. done.
Thu Jan  8 18:05:43 2015 - [info] Slaves settings check done.
Thu Jan  8 18:05:43 2015 - [info] 
192.168.1.2 (current master)
 +--192.168.1.3
 +--192.168.1.4
Thu Jan  8 18:05:43 2015 - [info] Checking replication health on 192.168.1.3..
Thu Jan  8 18:05:43 2015 - [info]  ok.
Thu Jan  8 18:05:43 2015 - [info] Checking replication health on 192.168.1.4..
Thu Jan  8 18:05:43 2015 - [info]  ok.
Thu Jan  8 18:05:43 2015 - [info] Checking master_ip_failover_script status:
Thu
 Jan  8 18:05:43 2015 - [info]   
/usr/local/mha/scripts/master_ip_failover --command=status 
--ssh_user=root --orig_master_host=192.168.1.2 
--orig_master_ip=192.168.1.2 --orig_master_port=3306

IN
 SCRIPT TEST====/sbin/ifconfig eth0:1 down==/sbin/ifconfig eth0:1 
192.168.1.100;/sbin/arping -I eth0 -c 3 -s 192.168.1.100 192.168.1.1 
>/dev/null 2>&1===
Checking the Status of the script.. OK 
Thu Jan  8 18:05:46 2015 - [info]  OK.
Thu Jan  8 18:05:46 2015 - [warning] shutdown_script is not defined.
Thu Jan  8 18:05:46 2015 - [info] Got exit code 0 (Not master dead).
MySQL Replication Health is OK.

 

啓動MHA

mv /usr/local/mha/scripts/master_ip_failover /usr/local/mha/scripts/master_ip_failover.def

vim /usr/local/mha/scripts/master_ip_failover 

#!/usr/bin/env perl
use strict;
use warnings FATAL => 'all';
use Getopt::Long;
my (
$command, $ssh_user, $orig_master_host, $orig_master_ip,
$orig_master_port, $new_master_host, $new_master_ip, $new_master_port
);
 
my $vip = '192.168.1.100'; # Virtual IP
my $gateway = '192.168.1.1'; #Gateway IP
my $interface = 'eth0';
my $key = "1";
my $ssh_start_vip = "/sbin/ifconfig $interface:$key $vip;/sbin/arping -I $interface -c 3 -s $vip $gateway >/dev/null 2>&1";
my $ssh_stop_vip = "/sbin/ifconfig $interface:$key down";
 
GetOptions(
'command=s' => \$command,
'ssh_user=s' => \$ssh_user,
'orig_master_host=s' => \$orig_master_host,
'orig_master_ip=s' => \$orig_master_ip,
'orig_master_port=i' => \$orig_master_port,
'new_master_host=s' => \$new_master_host,
'new_master_ip=s' => \$new_master_ip,
'new_master_port=i' => \$new_master_port,
);
exit &main();
sub main {
print "\n\nIN SCRIPT TEST====$ssh_stop_vip==$ssh_start_vip===\n\n";
if ( $command eq "stop" || $command eq "stopssh" ) {
# $orig_master_host, $orig_master_ip, $orig_master_port are passed.
# If you manage master ip address at global catalog database,
# invalidate orig_master_ip here.
my $exit_code = 1;
eval {
print "Disabling the VIP on old master: $orig_master_host \n";
&stop_vip();
$exit_code = 0;
};
if ($@) {
warn "Got Error: $@\n";
exit $exit_code;
}
exit $exit_code;
}
elsif ( $command eq "start" ) {
# all arguments are passed.
# If you manage master ip address at global catalog database,
# activate new_master_ip here.
# You can also grant write access (create user, set read_only=0, etc) here.
my $exit_code = 10;
eval {
print "Enabling the VIP - $vip on the new master - $new_master_host \n";
&start_vip();
$exit_code = 0;
};
if ($@) {
warn $@;
exit $exit_code;
}
exit $exit_code;
}
elsif ( $command eq "status" ) {
print "Checking the Status of the script.. OK \n";
`ssh $ssh_user\@$orig_master_host \" $ssh_start_vip \"`;
exit 0;
}
else {
&usage();
exit 1;
}
}
# A simple system call that enable the VIP on the new master
sub start_vip() {
`ssh $ssh_user\@$new_master_host \" $ssh_start_vip \"`;
}
# A simple system call that disable the VIP on the old_master
sub stop_vip() {
`ssh $ssh_user\@$orig_master_host \" $ssh_stop_vip \"`;
}
sub usage {
print
"Usage:
 master_ip_failover --command=start|stop|stopssh|status 
--orig_master_host=host --orig_master_ip=ip --orig_master_port=port 
--new_master_host=host --new_master_ip=ip --new_master_port=port\n";
}

# sed -i 's/#master_ip_failover_script/master_ip_failover_script/' /usr/local/mha/mha.conf

 配置文件的master_ip_failover_script前面註釋#取消

 

# chmod 755 /usr/local/mha/scripts/master_ip_failover
# masterha_check_repl --conf=/usr/local/mha/mha.conf


啓動mha

[root@manager ~]# masterha_manager --conf=/usr/local/mha/mha.conf &

或者 

nohup masterha_manager --conf=/usr/local/mha/mha.conf > /tmp/mha_manager.log  < /dev/null 2>&1 &

 

查看MHA

wKioL1SvOInAjkjZAAH64vw7QAw290.jpg

[root@manager ~]# masterha_check_status --conf=/usr/local/mha/mha.conf
mha (pid:2686) is running(0:PING_OK), master:192.168.1.2


到mysql主庫上看看ip信息，本身的ip，VIP

wKioL1SueHGwWiK5AAPP_YskCTE055.jpg

中止MHA
[root@manager ~]# masterha_stop --conf=/usr/local/mha/mha.conf

 

驗證MHA：

[root@db1 ~]# ip a #如今有VIP
[root@db1 ~]# service mysqld stop #mysql中止，在這時候VIP會作轉移
Shutting down MySQL... SUCCESS!
[root@db1 ~]# ip a #已經沒有VIP

IP已經轉移到db2，而且在db3上 mysql> show slave status\G 查看 Master_Server_Id: 2

wKiom1Sud8PxYxZ0AAOV3qG1V5A991.jpg

 

查看mysql_MHA日誌

/usr/local/mha/manager.log

#檢查到db1數據庫出錯

Fri Jan  9 10:09:39 2015 - [info] Executing seconary network check script: masterha_secondary_check -s 192.168.1.2 -s 192.168.1.3 -s 192.168.1.4  --user=root  --master_host=192.168.1.2  --master_ip=192.168.1.2  --master_port=3306
Fri Jan  9 10:09:39 2015 - [info] Executing SSH check script: save_binary_logs --command=test --start_pos=4 --binlog_dir=/var/mysql/log --output_file=/usr/local/mha/save_binary_logs_test --manager_version=0.55 --binlog_prefix=mysql-bin
Fri Jan  9 10:09:39 2015 - [info] HealthCheck: SSH to 192.168.1.2 is reachable.
Monitoring server 192.168.1.2 is reachable, Master is not reachable from 192.168.1.2. OK.
Monitoring server 192.168.1.3 is reachable, Master is not reachable from 192.168.1.3. OK.
Monitoring server 192.168.1.4 is reachable, Master is not reachable from 192.168.1.4. OK.
Fri Jan  9 10:09:39 2015 - [info] Master is not reachable from all other monitoring servers. Failover should start.
Fri Jan  9 10:09:40 2015 - [warning] Got error on MySQL connect: 2013 (Lost connection to MySQL server at 'reading initial communication packet', system error: 111)
Fri Jan  9 10:09:40 2015 - [warning] Connection failed 1 time(s)..

#轉移
Fri Jan  9 10:09:42 2015 - [info] Dead Servers:
Fri Jan  9 10:09:42 2015 - [info]   192.168.1.2(192.168.1.2:3306)
Fri Jan  9 10:09:42 2015 - [info] Alive Servers:
Fri Jan  9 10:09:42 2015 - [info]   192.168.1.3(192.168.1.3:3306)
Fri Jan  9 10:09:42 2015 - [info]   192.168.1.4(192.168.1.4:3306)
Fri Jan  9 10:09:42 2015 - [info] Alive Slaves:
Fri Jan  9 10:09:42 2015 - [info]   192.168.1.3(192.168.1.3:3306)  Version=5.5.37-log (oldest major version between slaves) log-bin:enabled
Fri Jan  9 10:09:42 2015 - [info]     Replicating from 192.168.1.2(192.168.1.2:3306)
Fri Jan  9 10:09:42 2015 - [info]     Primary candidate for the new Master (candidate_master is set)
Fri Jan  9 10:09:42 2015 - [info]   192.168.1.4(192.168.1.4:3306)  Version=5.5.37-log (oldest major version between slaves) log-bin:enabled
Fri Jan  9 10:09:42 2015 - [warning]  relay_log_purge=0 is not set on slave 192.168.1.3(192.168.1.3:3306).
Fri Jan  9 10:09:42 2015 - [warning]  relay_log_purge=0 is not set on slave 192.168.1.4(192.168.1.4:3306).

Disabling the VIP on old master: 192.168.1.2
Fri Jan  9 10:09:42 2015 - [info]  done.
Fri Jan  9 10:09:42 2015 - [warning] shutdown_script is not set. Skipping explicit shutting down of the dead master.

Fri Jan  9 10:09:42 2015 - [info] The latest binary log file/position on all slaves is mysql-bin.000003:107
Fri Jan  9 10:09:42 2015 - [info] Latest slaves (Slaves that received relay log files to the latest):
Fri Jan  9 10:09:42 2015 - [info]   192.168.1.3(192.168.1.3:3306)  Version=5.5.37-log (oldest major version between slaves) log-bin:enabled
Fri Jan  9 10:09:42 2015 - [info]     Replicating from 192.168.1.2(192.168.1.2:3306)
Fri Jan  9 10:09:42 2015 - [info]     Primary candidate for the new Master (candidate_master is set)
Fri Jan  9 10:09:42 2015 - [info]   192.168.1.4(192.168.1.4:3306)  Version=5.5.37-log (oldest major version between slaves) log-bin:enabled

#轉移後

Fri Jan  9 10:09:43 2015 - [info] Starting master failover..
Fri Jan  9 10:09:43 2015 - [info]
From:
192.168.1.2 (current master)
 +--192.168.1.3
 +--192.168.1.4

To:
192.168.1.3 (new master)
 +--192.168.1.4

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

mha: MySQL Master failover 192.168.1.2 to 192.168.1.3 succeeded

Master 192.168.1.2 is down!


看這個日誌就跟看電影同樣，高潮部分，O(∩_∩)O哈哈~

在 db1 此目錄 /usr/local/mha/ 會有binlog文件

saved_master_binlog_from_192.168.1.2_3306_20150109100942.binlog


當db1 mysql down後，manager會中止運行，

[root@manager ~]# masterha_check_status --conf=/usr/local/mha/mha.conf
mha is stopped(2:NOT_RUNNING).
[1]+  Done                    nohup masterha_manager --conf=/usr/local/mha/mha.conf > /tmp/mha_manager.log < /dev/null 2>&1

 

#恢復操做

1，db1啓動mysql

[root@db1 ~]# service mysqld start
Starting MySQL.. SUCCESS!


2，mysqlbinlog 查看binlog文件，而後把db1主作爲備

# mysqlbinlog saved_master_binlog_from_192.168.1.2_3306_20150109100942.binlog > mysqlbinlog.sql           #轉換binlog爲sql語句


3，less  mysqlbinlog.sql   #找出同步的pos作從，或者從新作mysql從

change master to MASTER_HOST='192.168.1.3', MASTER_PORT=3306,MASTER_USER='mharep', MASTER_PASSWORD='passwd',master_log_file='mysql-bin.000001', master_log_pos=107;
slave start;
show slave status\G;


4，啓動manager的管理

wKioL1SvSqDCahw6AAHqcx_RaL4038.jpg

# nohup masterha_manager --conf=/usr/local/mha/mha.conf > /tmp/mha_manager.log < /dev/null 2>&1 &

# masterha_check_status --conf=/usr/local/mha/mha.conf


若是有這個提示，那麼刪除此文件/usr/local/mha/mha.failover.complete

[error][/usr/share/perl5/vendor_perl/MHA/MasterFailover.pm, ln298] Last failover was done at 2015/01/09 10:00:47. Current time is too early to do failover again. If you want to do failover, manually remove /usr/local/mha/mha.failover.complete and run this script again.



5，MmysqlMHA的VIP手動切換

masterha_check_repl --conf=/usr/local/mha/mha.conf

nohup masterha_manager --conf=/usr/local/mha/mha.conf > /tmp/mha_manager.log  < /dev/null 2>&1 &

masterha_check_status --conf=/usr/local/mha/mha.conf

 

masterha_stop --conf=/usr/local/mha/mha.conf

 

masterha_master_switch --conf=/usr/local/mha/mha.conf --master_state=alive --new_master_host=192.168.(new master IP address) --new_master_port=3306 --orig_master_is_new_slave --running_updates_limit=10000


上面用到的配置下載地址：http://down.51cto.com/data/2065725 

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