MySQL56+MHA+MAXSCALE构建高可用

533442

架构图：

要点：
    1、安装配置MHA

    2、主从搭建

    3、MAXSCALE安装配置

    4、单节点故障

    简介：Master HighAvailability
    该软件由两部分组成：MHA Manager（管理节点）和MHA Node（数据节点）
    MHA工作原理总结为如下：
    （1）从宕机崩溃的master保存二进制日志事件（binlog events）
    （2）识别含有最新更新的slave
    （3）应用差异的中继日志（relay log）到其他的slave
    （4）应用从master保存的二进制日志事件（binlog events）
    （5）提升一个slave为新的master
    （6）使其他的slave连接新的master进行复制

    Manager工具包主要包括以下几个工具：
    masterha_check_ssh               检查MHA的SSH配置状况
    masterha_check_repl               检查MySQL复制状况
    masterha_manger                 启动MHA
    masterha_check_status             检测当前MHA运行状态
    masterha_master_monitor          检测master是否宕机
    masterha_master_switch            控制故障转移（自动或者手动）
    masterha_conf_host                添加或删除配置的server信息

    Node工具包
    save_binary_logs          保存和复制master的二进制日志
    apply_diff_relay_logs    识别差异的中继日志事件并将其差异的事件应用于其他的slave
    filter_mysqlbinlog         去除不必要的ROLLBACK事件（MHA已不再使用这个工具）
    purge_relay_logs          清除中继日志（不会阻塞SQL线程）
一、MySQL主从搭建（略）
二、Mha 安装

1、在所有节点安装MHA node所需的perl模块（DBD:mysql）

yum install perl-DBD-MySQL –y
yum -y install perl-DBD-MySQLperl-Config-Tiny perl-Params-Validate perl-CPAN perl-develperl-ExtUtils-CBuilder perl-ExtUtils-MakeMaker
###这里有些包可能没有安装上

2、在所有节点安装mha node

tar -xvf mha4mysql-node-0.57.tar.gz
cd mha4mysql-node-0.57
perl Makefile.PL
make
make install

安装后再/usr/local/bin下生成以下文件
apply_diff_relay_logs
filter_mysqlbinlog
purge_relay_logs
save_binary_logs

3、安装MHA Manager

cd mha4mysql-manager-0.57
perl Makefile.PL
make
make install
###执行的时候会提示其他一些东西，下载安装一直输入Y
#yum –y install perl-* ##在存放包路径下执行
rw-r--r-- 1 root root 21272 Sep 15 05:52perl-Config-Tiny-2.12-1.el6.rfx.noarch.rpm
-rw-r--r-- 1 root root 72328 Sep 15 05:52perl-Log-Dispatch-2.26-1.el6.rf.noarch.rpm
-rw-r--r-- 1 root root 14840 Sep 15 05:52perl-Parallel-ForkManager-0.7.5-2.2.el6.rf.noarch.rpm
-rw-r--r-- 1 root root 76684 Sep 15 05:52perl-Params-Validate-0.92-3.el6.x86_64.rpm
拷贝相关脚本到/usr/local/bin下
cd /usr/local/mha4mysql-manager-0.57/samples/scripts
scp * /usr/local/bin
###一些检测检测脚本拷贝到/usr/bin/目录下
#scp /root/mha4mysql-manager-0.57/bin/*/usr/bin/
master_ip_failover      #自动切换时vip管理的脚本，不是必须，如果我们使用keepalived的，我们可以自己编写脚本完成对vip的管理，比如监控mysql，如果mysql异常，我们停止keepalived就行，这样vip就会自动漂移
master_ip_online_change #在线切换时vip的管理，不是必须，同样可以可以自行编写简单的shell完成
power_manager   #故障发生后关闭主机的脚本，不是必须
send_report    #因故障切换后发送报警的脚本，不是必须，可自行编写简单的shell完成。

4、配置SSH登录无密码验证

###配置前配置各主机的/etc/hosts信息

1）在每台发服务器上执行：ssh-keygen-t rsa

ssh-copy-id -i.ssh/id_rsa.pub "root@192.168.1.107"
ssh-copy-id -i.ssh/id_rsa.pub "root@192.168.1.108"   
ssh-copy-id -i .ssh/id_rsa.pub "root@192.168.1.114"

5、两台Slave服务设置read_only

set global read_only=1;

7、在master库创建监控用户
grant all privileges on *.* to dlan@'192.168.%'identified  by 'root123';
flush privileges;

8、配置mha

1）创建MHA的工作目录，并且创建相关配置文件

mkdir -p /etc/masterha
cd /usr/local/mha4mysql-manager-0.57/samples/conf
cp app1.cnf /etc/masterha/

2）修改配置文件

vi/etc/masterha/app1.cnf
[server default]
manager_workdir=/var/log/masterha            
manager_log=/var/log/masterha/app1/manager.log         
master_binlog_dir=/data/mysql
master_ip_failover_script=/usr/local/bin/master_ip_failover
master_ip_online_change_script=/usr/local/bin/master_ip_online_change
password=root123
user=dlan
ping_interval=1
remote_workdir=/tmp
repl_password=root123
repl_user=repl
#report_script=/usr/local/bin/send_report
ssh_user=root

[server1]
hostname=192.168.1.114
candidate_master=1
port=3306

[server2]
hostname=192.168.1.107
port=3306
candidate_master=1

[server3]
hostname=192.168.1.108
port=3306
no_master=1

3）检查ssh设置

##可能需要设置用户连接方式socket和tcp/ip两种方式，对rep的用户
masterha_check_ssh--conf=/etc/masterha/app1.cnf
Thu Sep 1506:18:44 2016 - [info] All SSH connection tests passed successfully.

4）检查主从复制

masterha_check_repl--conf=/etc/masterha/app1.cnf

5）安装keepalived
tar xf keepalived-1.2.12.tar.gz           
cdkeepalived-1.2.12
./configure--prefix=/usr/local/keepalived
make&&  make install
cp/usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/init.d/
cp/usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/
mkdir/etc/keepalived
cp /usr/local/keepalived/etc/keepalived/keepalived.conf/etc/keepalived/
cp/usr/local/keepalived/sbin/keepalived /usr/sbin/
主库keepalived配置文件
vi/etc/keepalived/keepalived.conf
! Configuration File for keepalived

global_defs {
   notification_email {
     acassen@firewall.loc
     failover@firewall.loc
     sysadmin@firewall.loc
   }
   notification_email_from Alexandre.Cassen@firewall.loc
   smtp_server 192.168.200.1
   smtp_connect_timeout 30
   router_id LVS_DEVEL
}

vrrp_instance VI_1 {
    state MASTER
    interface eth0
    virtual_router_id 51
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.1.219 dev eth0 scope global
    }
}

备用主库的keepalived配置文件
vi/etc/keepalived/keepalived.conf

! Configuration File for keepalived

global_defs {
   notification_email {
     acassen@firewall.loc
     failover@firewall.loc
     sysadmin@firewall.loc
   }
   notification_email_from Alexandre.Cassen@firewall.loc
   smtp_server 192.168.200.1
   smtp_connect_timeout 30
   router_id LVS_DEVEL
}

vrrp_instance VI_1 {
    state BACKUP
    interface eth0
    virtual_router_id 51
    priority 90
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.1.219 dev eth0 scope global
    }
}
7）mhamanager管理
启动manager
nohupmasterha_manager --conf=/etc/masterha/app1.cnf --remove_dead_master_conf--ignore_last_failover < /dev/null > /var/log/masterha/app1/manager.log2>&1 &


nohupmasterha_manager --conf=/etc/mhamaster/app1.cnf >/var/log/masterha/manager.log  < /dev/null2>&1 &
关闭manager
masterha_stop --conf=/etc/masterha/app1.cnf
查看manager的状态
masterha_check_status--conf=/etc/masterha/app1.cnf

切换
1启动manager后，master发生故障后会自动切换

2在线切换过程
masterha_stop  --conf=/etc/masterha/app1.cnfmasterha_master_switch--conf=/etc/masterha/app1.cnf --master_state=alive--new_master_host=192.168.1.108 --new_master_port=3306--orig_master_is_new_slave --running_updates_limit=10000


测试过程中需要关注的几个问题：
1.切换过程会自动把read_only关闭
show variables like '%read_only%';
2、切换之后需要删除手工删除/masterha/app1/app1.failover.complete，才能进行第二次
3.一旦发生切换管理进程将会退出，无法进行再次测试，需将故障数据库加入到MHA环境中来
4.原主节点重新加入到MHA时只能设置为slave,在
####注意：切换过程在在日志获取change master to的信息。记录最新的主库的POS位置信息
5.关于ip地址的接管有几种方式，这里采用的是MHA自动调用ip别名的方式，好处是在能够保证数据库状态与业务Ip 切换的一致性。启动管理节点之后 vip会自动别名到当前主节点上，keepalived也只能做到对3306的健康检查，但是做不到比如像MySQL复制中的slave-SQL、slave-IO进程的检查，容易出现对切换的误判。
6.注意：二级从服务器需要将log_slave_updates打开
7.手工切换需要先定义好master_ip_online_change_script脚本,不然只会切换mysql,Ip地址不会绑定上去，可以根据模板来配置该脚本
8.通过设置no_master=1可以让某一个节点永远不成为新的主节点

9、切换后，被切的点的keepalived会被停止工作，若需要后续提供功能还需要重新启动

手动切换后，使用masterha_check_repl不能使用原来的/etc/masterha/app1.cnf来做check，要用新的app2.cnf来做check，因为app1.cnf里面的master是原来旧的cnf，check会报错主从复制失败

1）复制原理的app1.cnf为新的app2.cnf

cp/etc/masterha/app1.cnf/etc/masterha/app2.cnf

（2）编辑app2.cnf，将里面的server1和server2的ip互换，也就是switch的两个主从的ip换掉

相关脚本
1）master_ip_failover
#!/usr/bin/envperl

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 ='192.168.1.219';
my $ssh_start_vip= "/etc/init.d/keepalived start";
my $ssh_stop_vip ="/etc/init.d/keepalived stop";

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 SCRIPTTEST====$ssh_stop_vip==$ssh_start_vip===\n\n";

    if ( $command eq "stop" ||$command eq "stopssh" ) {

        my $exit_code = 1;
        eval {
            print "Disabling the VIP onold 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" ) {

        my $exit_code = 10;
        eval {
            print "Enabling the VIP - $vipon 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 thescript.. OK \n";
        #`ssh $ssh_user\@cluster1 \"$ssh_start_vip \"`;
        exit 0;
    }
    else {
        &usage();
        exit 1;
    }
}

# A simple systemcall that enable the VIP on the new master
sub start_vip() {
    `ssh $ssh_user\@$new_master_host \"$ssh_start_vip \"`;
}
# A simple systemcall that disable the VIP on the old_master
sub stop_vip() {
     return 0 unless  ($ssh_user);
    `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";
}

2）master_ip_online_change
#!/usr/bin/envperl

#  Copyright (C) 2011 DeNA Co.,Ltd.
#
#  This program is free software; you canredistribute it and/or modify
#  it under the terms of the GNU General PublicLicense as published by
#  the Free Software Foundation; either version2 of the License, or
#  (at your option) any later version.
#
#  This program is distributed in the hope thatit will be useful,
#  but WITHOUT ANY WARRANTY; without even theimplied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULARPURPOSE.  See the
#  GNU General Public License for more details.
#
#  You should have received a copy of the GNUGeneral Public License
#   along with this program; if not, write to theFree Software
#  Foundation, Inc.,
#  51 Franklin Street, Fifth Floor, Boston,MA  02110-1301  USA

## Note: This is asample script and is not complete. Modify the script based on your environment.

use strict;
use warnings FATAL=> 'all';

use Getopt::Long;
use MHA::DBHelper;
use MHA::NodeUtil;
use Time::HiResqw( sleep gettimeofday tv_interval );
use Data::Dumper;

my $ssh_user ="root";
my $vip ='192.168.1.219';
my $ssh_start_vip= "/etc/init.d/keepalived start";
my $ssh_stop_vip ="/etc/init.d/keepalived stop";
my $_tstart;
my$_running_interval = 0.1;
my (
  $command,          $orig_master_host, $orig_master_ip,
  $orig_master_port, $orig_master_user,$orig_master_password,
  $new_master_host,  $new_master_ip,    $new_master_port,
  $new_master_user,  $new_master_password
);
GetOptions(
  'command=s'              => \$command,
  'orig_master_host=s'     => \$orig_master_host,
  'orig_master_ip=s'       => \$orig_master_ip,
  'orig_master_port=i'     => \$orig_master_port,
  'orig_master_user=s'     => \$orig_master_user,
  'orig_master_password=s' =>\$orig_master_password,
  'new_master_host=s'      => \$new_master_host,
  'new_master_ip=s'        => \$new_master_ip,
  'new_master_port=i'      => \$new_master_port,
  'new_master_user=s'      => \$new_master_user,
  'new_master_password=s'  => \$new_master_password,
);

exit &main();

subcurrent_time_us {
  my ( $sec, $microsec ) = gettimeofday();
  my $curdate = localtime($sec);
  return $curdate . " " . sprintf("%06d", $microsec );
}

sub sleep_until {
  my $elapsed = tv_interval($_tstart);
  if ( $_running_interval > $elapsed ) {
    sleep( $_running_interval - $elapsed );
  }
}

subget_threads_util {
  my $dbh                    = shift;
  my $my_connection_id       = shift;
  my $running_time_threshold = shift;
  my $type                   = shift;
  $running_time_threshold = 0 unless($running_time_threshold);
  $type                   = 0 unless ($type);
  my @threads;

  my $sth = $dbh->prepare("SHOWPROCESSLIST");
  $sth->execute();

  while ( my $ref = $sth->fetchrow_hashref()) {
    my $id         = $ref->{Id};
    my $user       = $ref->{User};
    my $host       = $ref->{Host};
    my $command    = $ref->{Command};
    my $state      = $ref->{State};
    my $query_time = $ref->{Time};
    my$info       = $ref->{Info};
    $info =~ s/^\s*(.*?)\s*$/$1/ ifdefined($info);
    next if ( $my_connection_id == $id );
    next if ( defined($query_time) &&$query_time < $running_time_threshold );
    next if ( defined($command)    && $command eq "BinlogDump" );
    next if ( defined($user)       && $user eq "systemuser" );
    next
      if ( defined($command)
      && $command eq "Sleep"
      && defined($query_time)
      && $query_time >= 1 );

    if ( $type >= 1 ) {
      next if ( defined($command) &&$command eq "Sleep" );
      next if ( defined($command) &&$command eq "Connect" );
    }

    if ( $type >= 2 ) {
      next if ( defined($info) && $info=~ m/^select/i );
      next if ( defined($info) && $info=~ m/^show/i );
    }

    push @threads, $ref;
  }
  return @threads;
}

sub main {
  if ( $command eq "stop" ) {
    ## Gracefully killing connections on thecurrent master
    # 1. Set read_only= 1 on the new master
    # 2. DROP USER so that no app user canestablish new connections
    # 3. Set read_only= 1 on the current master
    # 4. Kill current queries
    # * Any database access failure will resultin script die.
    my $exit_code = 1;
    eval {
      ## Setting read_only=1 on the new master(to avoid accident)
      my $new_master_handler = newMHA::DBHelper();

      # args: hostname, port, user, password,raise_error(die_on_error)_or_not
      $new_master_handler->connect($new_master_ip, $new_master_port,
        $new_master_user, $new_master_password,1 );
     print current_time_us() . " Set read_only on the new master..";
     $new_master_handler->enable_read_only();
      if ($new_master_handler->is_read_only() ) {
        print "ok.\n";
      }
      else {
        die "Failed!\n";
      }
      $new_master_handler->disconnect();

      # Connecting to the orig master, die ifany database error happens
      my $orig_master_handler = newMHA::DBHelper();
      $orig_master_handler->connect($orig_master_ip, $orig_master_port,
        $orig_master_user,$orig_master_password, 1 );

      ## Drop application user so that nobodycan connect. Disabling per-session binlog beforehand
     $orig_master_handler->disable_log_bin_local();
      print current_time_us() . " Drppingapp user on the orig master..\n";
     #FIXME_xxx_drop_app_user($orig_master_handler);

      ## Waiting for N * 100 milliseconds sothat current connections can exit
      my $time_until_read_only = 15;
      $_tstart = [gettimeofday];
      my @threads = get_threads_util($orig_master_handler->{dbh},
       $orig_master_handler->{connection_id} );
      while ( $time_until_read_only > 0&& $#threads >= 0 ) {
        if ( $time_until_read_only % 5 == 0 ) {
          printf
"%s Waitingall running %d threads are disconnected.. (max %d milliseconds)\n",
            current_time_us(), $#threads + 1,$time_until_read_only * 100;
          if ( $#threads < 5 ) {
            print Data::Dumper->new( [$_])->Indent(0)->Terse(1)->Dump . "\n"
              foreach (@threads);
          }
        }
        sleep_until();
        $_tstart = [gettimeofday];
        $time_until_read_only--;
        @threads = get_threads_util($orig_master_handler->{dbh},
         $orig_master_handler->{connection_id} );
      }

      ## Setting read_only=1 on the currentmaster so that nobody(except SUPER) can write
      print current_time_us() . " Setread_only=1 on the orig master.. ";
     $orig_master_handler->enable_read_only();
      if ($orig_master_handler->is_read_only() ) {
        print "ok.\n";
      }
      else {
        die "Failed!\n";
      }

      ## Waiting for M * 100 milliseconds sothat current update queries can complete
      my $time_until_kill_threads = 5;
      @threads = get_threads_util($orig_master_handler->{dbh},
        $orig_master_handler->{connection_id});
      while ( $time_until_kill_threads > 0&& $#threads >= 0 ) {
        if ( $time_until_kill_threads % 5 == 0) {
          printf
"%s Waitingall running %d queries are disconnected.. (max %d milliseconds)\n",
            current_time_us(), $#threads + 1,$time_until_kill_threads * 100;
          if ( $#threads < 5 ) {
            print Data::Dumper->new( [$_])->Indent(0)->Terse(1)->Dump . "\n"
              foreach (@threads);
          }
        }
        sleep_until();
        $_tstart = [gettimeofday];
        $time_until_kill_threads--;
        @threads = get_threads_util($orig_master_handler->{dbh},
         $orig_master_handler->{connection_id} );
      }

      print "Disabling the VIP on oldmaster: $orig_master_host \n";
      &stop_vip();
      ## Terminating all threads
      print current_time_us() . " Killingall application threads..\n";
     $orig_master_handler->kill_threads(@threads) if ( $#threads >= 0);
      print current_time_us() . "done.\n";
      $orig_master_handler->enable_log_bin_local();
      $orig_master_handler->disconnect();

      ## After finishing the script, MHAexecutes FLUSH TABLES WITH READ LOCK
      $exit_code = 0;
    };
    if ($@) {
      warn "Got Error: $@\n";
      exit $exit_code;
    }
    exit $exit_code;
  }
  elsif ( $command eq "start" ) {
    ## Activating master ip on the new master
    # 1. Create app user with write privileges
    # 2. Moving backup script if needed
    # 3. Register new master's ip to thecatalog database

# We don't returnerror even though activating updatable accounts/ip failed so that we don'tinterrupt slaves' recovery.
# If exit code is0 or 10, MHA does not abort
    my $exit_code = 10;
    eval {
      my $new_master_handler = new MHA::DBHelper();

      # args: hostname, port, user, password,raise_error_or_not
      $new_master_handler->connect($new_master_ip, $new_master_port,
        $new_master_user, $new_master_password,1 );

      ## Set read_only=0 on the new master
      $new_master_handler->disable_log_bin_local();
      print current_time_us() . " Setread_only=0 on the new master.\n";
     $new_master_handler->disable_read_only();

      ## Creating an app user on the new master
      print current_time_us() . " Creatingapp user on the new master..\n";
     FIXME_xxx_create_app_user($new_master_handler);
     $new_master_handler->enable_log_bin_local();
      $new_master_handler->disconnect();

      ## Update master ip on the catalogdatabase, etc
      print "Enabling the VIP - $vip onthe new master - $new_master_host \n";
      &start_vip();
      $exit_code = 0;
    };
    if ($@) {
      warn "Got Error: $@\n";
      exit $exit_code;
    }
    exit $exit_code;
  }
  elsif ( $command eq "status" ) {

    # do nothing
    exit0;
  }
  else {
    &usage();
    exit 1;
  }
}

# A simple systemcall that enable the VIP on the new master
sub start_vip() {
    `ssh $ssh_user\@$new_master_host \"$ssh_start_vip \"`;
}
# A simple systemcall 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_online_change --command=start|stop|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";
  die;
}
三、安装MAXSCALE
    1、安装MX 可根据提供下载的有2.0 和1.43的版本

    yum -y intall maxsclae.......

    2、配置文件


# MaxScale documentation on GitHub:
# https://github.com/mariadb-corpo ... ntation-Contents.md

# Global parameters
#
# Complete list of configuration options:
# https://github.com/mariadb-corpo ... figuration-Guide.md

[maxscale]
threads=1

# Server definitions
#
# Set the address of the server to the network
# address of a MySQL server.
[server1]
type=server
address=192.168.1.114
port=3306
protocol=MySQLBackend

[server2]
type=server
address=192.168.1.107
port=3306
protocol=MySQLBackend

[server3]
type=server
address=192.168.1.108
port=3306
protocol=MySQLBackend
# Monitor for the servers
#
# This will keep MaxScale aware of the state of the servers.
# MySQL Monitor documentation:
# https://github.com/mariadb-corpo ... rs/MySQL-Monitor.md

[MySQL Monitor]
type=monitor
module=mysqlmon
servers=server1,server2,server3
user=maxscale_monitor
passwd=root123
monitor_interval=10000

# Service definitions
#
# Service Definition for a read-only service and
# a read/write splitting service.
#

# ReadConnRoute documentation:
# https://github.com/mariadb-corpo ... rs/ReadConnRoute.md

#[Read-Only Service]
#type=service
#router=readconnroute
#servers=server1
#user=myuser
#passwd=mypwd
#router_options=slave

# ReadWriteSplit documentation:
# https://github.com/mariadb-corpo ... s/ReadWriteSplit.md

[Read-Write Service]
type=service
router=readwritesplit
servers=server1,server2,server3
user=maxscale
passwd=root123
max_slave_connections=100%

# This service enables the use of the MaxAdmin interface
# MaxScale administration guide:
# https://github.com/mariadb-corpo ... ference/MaxAdmin.md

[MaxAdmin Service]
type=service
router=cli

# Listener definitions for the services
#
# These listeners represent the ports the
# services will listen on.
#

#[Read-Only Listener]
#type=listener
#service=Read-Only Service
#protocol=MySQLClient
#port=4008

[Read-Write Listener]
type=listener
service=Read-Write Service
protocol=MySQLClient
port=4006

[MaxAdmin Listener]
type=listener
service=MaxAdmin Service
protocol=maxscaled
port=6603
    3、在DB主库上添加路由用户和监控用户供MX使用
    4、在MHA的备机上也安装MX，避免路由单节点故障后致使整个故障
    5、检测脚本，检测MX的存活状态
    ####至此mha+maxscale 的架构类似haproxy+mysql集群方案