MySQL高可用方案 MHA之三 master_ip_online_change

主从架构
master:
10.150.20.90 ed3jrdba90
slave:
10.150.20.97 ed3jrdba97
10.150.20.132 ed3jrdba132
manager:
10.150.20.95 ed3jrdba95
vip:
10.150.20.200


master_ip_online_change参数
mha manager 节点上

# vi /etc/mysql_mha/app1.cnf

#手动switchover时候的切换脚本
master_ip_online_change_script= /usr/local/bin/master_ip_online_change

master_ip_online_change_script 指的是手动执行mysql master switchover时执行的切换脚本。

# cat /etc/mysql_mha/app1.cnf 
[server default]
manager_log=/data/mysql_mha/app1-manager.log
manager_workdir=/data/mysql_mha/app1
master_binlog_dir=/data/mysql_33061/logs
master_ip_online_change_script= /usr/local/bin/master_ip_online_change
password=mha_monitor
ping_interval=5
remote_workdir=/data/mysql_mha/app1
repl_password=replicator
repl_user=replicator
shutdown_script=""
ssh_user=root
user=mha_monitor

[server1]
hostname=10.150.20.90
port=33061

[server2]
hostname=10.150.20.97
port=33061

[server3]
hostname=10.150.20.132
port=33061
编辑master_ip_online_change脚本，没有使用 keepalived ，通过脚本的方式管理vip 

 cat /usr/local/bin/master_ip_online_change
#!/usr/bin/env perl

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

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

my $_tstart;
my $_running_interval = 0.1;
my (
  $command,          
  $orig_master_is_new_slave, $orig_master_host, $orig_master_ip,  $orig_master_port, $orig_master_user,    $orig_master_password, $orig_master_ssh_user,
  $new_master_host,          $new_master_ip,    $new_master_port, $new_master_user,  $new_master_password, $new_master_ssh_user,
);


my $vip = '10.150.20.200';
my $brdc = '10.150.20.255';
my $ifdev = 'ens3';
my $key = '1';
my $ssh_start_vip = "/usr/sbin/ip addr add $vip/24 brd $brdc dev $ifdev label $ifdev:$key;/usr/sbin/arping -q -A -c 1 -I $ifdev $vip;iptables -F;";
my $ssh_stop_vip = "/usr/sbin/ip addr del $vip/24 dev $ifdev label $ifdev:$key";


GetOptions(
  'command=s'                => $command,
  'orig_master_is_new_slave' => $orig_master_is_new_slave,
  '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,
  'orig_master_ssh_user=s'   => $orig_master_ssh_user,
  '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,
  'new_master_ssh_user=s'    => $new_master_ssh_user,
);

exit &main();

sub current_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 );
  }
}

sub get_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("SHOW PROCESSLIST");
  $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};
    $info =~ s/^s*(.*?)s*$/$1/ if defined($info);
    next if ( $my_connection_id == $id );
    next if ( defined($query_time) && $query_time < $running_time_threshold );
    next if ( defined($command)    && $command eq "Binlog Dump" );
    next if ( defined($user)       && $user eq "system user" );
    next
      if ( defined($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 the current master
    # 1. Set read_only= 1 on the new master
    # 2. DROP USER so that no app user can establish new connections
    # 3. Set read_only= 1 on the current master
    # 4. Kill current queries
    # * Any database access failure will result in script die.
    my $exit_code = 1;
    eval {
      ## Setting read_only=1 on the new master (to avoid accident)
      my $new_master_handler = new MHA::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.
";
      }
      else {
        die "Failed!
";
      }
      $new_master_handler->disconnect();

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

      ## Drop application user so that nobody can connect. Disabling per-session binlog beforehand
      #$orig_master_handler->disable_log_bin_local();
      #print current_time_us() . " Drpping app user on the orig master..
";
      #FIXME_xxx_drop_app_user($orig_master_handler);

      ## Waiting for N * 100 milliseconds so that 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 Waiting all running %d threads are disconnected.. (max %d milliseconds)
",
            current_time_us(), $#threads + 1, $time_until_read_only * 100;
          if ( $#threads < 5 ) {
            print Data::Dumper->new( [$_] )->Indent(0)->Terse(1)->Dump . "
"
              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 current master so that nobody(except SUPER) can write
      print current_time_us() . " Set read_only=1 on the orig master.. ";
      $orig_master_handler->enable_read_only();
      if ( $orig_master_handler->is_read_only() ) {
        print "ok.
";
      }
      else {
        die "Failed!
";
      }

      ## Waiting for M * 100 milliseconds so that 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 Waiting all running %d queries are disconnected.. (max %d milliseconds)
",
            current_time_us(), $#threads + 1, $time_until_kill_threads * 100;
          if ( $#threads < 5 ) {
            print Data::Dumper->new( [$_] )->Indent(0)->Terse(1)->Dump . "
"
              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 old master: $orig_master_host 
";
                &stop_vip();     


      ## Terminating all threads
      print current_time_us() . " Killing all application threads..
";
      $orig_master_handler->kill_threads(@threads) if ( $#threads >= 0 );
      print current_time_us() . " done.
";
      #$orig_master_handler->enable_log_bin_local();
      $orig_master_handler->disconnect();

      ## After finishing the script, MHA executes FLUSH TABLES WITH READ LOCK
      $exit_code = 0;
    };
    if ($@) {
      warn "Got Error: $@
";
      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 the catalog database

# We don't return error even though activating updatable accounts/ip failed so that we don't interrupt slaves' recovery.
# If exit code is 0 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() . " Set read_only=0 on the new master.
";
      $new_master_handler->disable_read_only();

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

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

    # do nothing
    exit 0;
  }
  else {
    &usage();
    exit 1;
  }
}

# A simple system call that enable the VIP on the new master 
sub start_vip() {
    `ssh $new_master_ssh_user@$new_master_host " $ssh_start_vip "`;
}
# A simple system call that disable the VIP on the old_master
sub stop_vip() {
    `ssh $orig_master_ssh_user@$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 --orig_master_user=user --orig_master_password=password --orig_master_ssh_user=sshuser --new_master_host=host --new_master_ip=ip --new_master_port=port --new_master_user=user --new_master_password=password --new_master_ssh_user=sshuser 
";
  die;
}
master_ip_online_change

更换ip后，一定要执行下 arping

验证 switchover
手动切换之前先停止 mha manager

关闭 mha manager
#masterha_stop --conf=/etc/mysql_mha/app1.cnf

查看 manager status
# masterha_check_status --conf=/etc/mysql_mha/app1.cnf
app1 is stopped(2:NOT_RUNNING).

查看 manager log
# tail -n 1000 -f /data/mysql_mha/app1-manager.log

检查复制环境ssh
# masterha_check_ssh --conf=/etc/mysql_mha/app1.cnf

检查整个复制环境
# masterha_check_repl --conf=/etc/mysql_mha/app1.cnf

手动执行
目前，ed3jrdba90目前是 master,ed3jrdba97是ed3jrdba90的 slave， 切换将ed3jrdba97为master，ed3jrdba90为slave。

# masterha_master_switch --conf=/etc/mysql_mha/app1.cnf --master_state=alive --orig_master_is_new_slave --new_master_host=10.150.20.97 --new_master_port=33061 --running_updates_limit=10000

# masterha_master_switch --conf=/etc/mysql_mha/app1.cnf --master_state=alive --orig_master_is_new_slave --new_master_host=10.150.20.97 --new_master_port=33061 --running_updates_limit=10000
Wed Dec 12 16:48:48 2018 - [info] MHA::MasterRotate version 0.58.
Wed Dec 12 16:48:48 2018 - [info] Starting online master switch..
Wed Dec 12 16:48:48 2018 - [info] 
Wed Dec 12 16:48:48 2018 - [info] * Phase 1: Configuration Check Phase..
Wed Dec 12 16:48:48 2018 - [info] 
Wed Dec 12 16:48:48 2018 - [info] Reading default configuration from /etc/masterha_default.cnf..
Wed Dec 12 16:48:48 2018 - [info] Reading application default configuration from /etc/mysql_mha/app1.cnf..
Wed Dec 12 16:48:48 2018 - [info] Reading server configuration from /etc/mysql_mha/app1.cnf..
Wed Dec 12 16:48:49 2018 - [info] GTID failover mode = 0
Wed Dec 12 16:48:49 2018 - [info] Current Alive Master: 10.150.20.90(10.150.20.90:33061)
Wed Dec 12 16:48:49 2018 - [info] Alive Slaves:
Wed Dec 12 16:48:49 2018 - [info] 10.150.20.97(10.150.20.97:33061) Version=5.7.21-log (oldest major version between slaves) log-bin:enabled
Wed Dec 12 16:48:49 2018 - [info] Replicating from 10.150.20.90(10.150.20.90:33061)
Wed Dec 12 16:48:49 2018 - [info] 10.150.20.132(10.150.20.132:33061) Version=5.7.21-log (oldest major version between slaves) log-bin:enabled
Wed Dec 12 16:48:49 2018 - [info] Replicating from 10.150.20.90(10.150.20.90:33061)

It is better to execute FLUSH NO_WRITE_TO_BINLOG TABLES on the master before switching. Is it ok to execute on 10.150.20.90(10.150.20.90:33061)? (YES/no): YES
Wed Dec 12 16:48:50 2018 - [info] Executing FLUSH NO_WRITE_TO_BINLOG TABLES. This may take long time..
Wed Dec 12 16:48:50 2018 - [info] ok.
Wed Dec 12 16:48:50 2018 - [info] Checking MHA is not monitoring or doing failover..
Wed Dec 12 16:48:50 2018 - [info] Checking replication health on 10.150.20.97..
Wed Dec 12 16:48:50 2018 - [info] ok.
Wed Dec 12 16:48:50 2018 - [info] Checking replication health on 10.150.20.132..
Wed Dec 12 16:48:50 2018 - [info] ok.
Wed Dec 12 16:48:50 2018 - [info] 10.150.20.97 can be new master.
Wed Dec 12 16:48:50 2018 - [info] 
From:
10.150.20.90(10.150.20.90:33061) (current master)
+--10.150.20.97(10.150.20.97:33061)
+--10.150.20.132(10.150.20.132:33061)

To:
10.150.20.97(10.150.20.97:33061) (new master)
+--10.150.20.132(10.150.20.132:33061)
+--10.150.20.90(10.150.20.90:33061)

Starting master switch from 10.150.20.90(10.150.20.90:33061) to 10.150.20.97(10.150.20.97:33061)? (yes/NO): yes
Wed Dec 12 16:48:51 2018 - [info] Checking whether 10.150.20.97(10.150.20.97:33061) is ok for the new master..
Wed Dec 12 16:48:51 2018 - [info] ok.
Wed Dec 12 16:48:51 2018 - [info] 10.150.20.90(10.150.20.90:33061): SHOW SLAVE STATUS returned empty result. To check replication filtering rules, temporarily executing CHANGE MASTER to a dummy host.
Wed Dec 12 16:48:51 2018 - [info] 10.150.20.90(10.150.20.90:33061): Resetting slave pointing to the dummy host.
Wed Dec 12 16:48:51 2018 - [info] ** Phase 1: Configuration Check Phase completed.
Wed Dec 12 16:48:51 2018 - [info] 
Wed Dec 12 16:48:51 2018 - [info] * Phase 2: Rejecting updates Phase..
Wed Dec 12 16:48:51 2018 - [info] 
Wed Dec 12 16:48:51 2018 - [info] Executing master ip online change script to disable write on the current master:
Wed Dec 12 16:48:51 2018 - [info] /usr/local/bin/master_ip_online_change --command=stop --orig_master_host=10.150.20.90 --orig_master_ip=10.150.20.90 --orig_master_port=33061 --orig_master_user='mha_monitor' --new_master_host=10.150.20.97 --new_master_ip=10.150.20.97 --new_master_port=33061 --new_master_user='mha_monitor' --orig_master_ssh_user=root --new_master_ssh_user=root --orig_master_is_new_slave --orig_master_password=xxx --new_master_password=xxx
Wed Dec 12 16:48:51 2018 572739 Set read_only on the new master.. ok.
Wed Dec 12 16:48:51 2018 576690 Set read_only=1 on the orig master.. ok.
Disabling the VIP on old master: 10.150.20.90 
Wed Dec 12 16:48:51 2018 716665 Killing all application threads..
Wed Dec 12 16:48:51 2018 716732 done.
Wed Dec 12 16:48:51 2018 - [info] ok.
Wed Dec 12 16:48:51 2018 - [info] Locking all tables on the orig master to reject updates from everybody (including root):
Wed Dec 12 16:48:51 2018 - [info] Executing FLUSH TABLES WITH READ LOCK..
Wed Dec 12 16:48:51 2018 - [info] ok.
Wed Dec 12 16:48:51 2018 - [info] Orig master binlog:pos is mysql-bin.000009:154.
Wed Dec 12 16:48:51 2018 - [info] Waiting to execute all relay logs on 10.150.20.97(10.150.20.97:33061)..
Wed Dec 12 16:48:51 2018 - [info] master_pos_wait(mysql-bin.000009:154) completed on 10.150.20.97(10.150.20.97:33061). Executed 0 events.
Wed Dec 12 16:48:51 2018 - [info] done.
Wed Dec 12 16:48:51 2018 - [info] Getting new master's binlog name and position..
Wed Dec 12 16:48:51 2018 - [info] mysql-bin.000014:154
Wed Dec 12 16:48:51 2018 - [info] All other slaves should start replication from here. Statement should be: CHANGE MASTER TO MASTER_HOST='10.150.20.97', MASTER_PORT=33061, MASTER_LOG_FILE='mysql-bin.000014', MASTER_LOG_POS=154, MASTER_USER='replicator', MASTER_PASSWORD='xxx';
Wed Dec 12 16:48:51 2018 - [info] Executing master ip online change script to allow write on the new master:
Wed Dec 12 16:48:51 2018 - [info] /usr/local/bin/master_ip_online_change --command=start --orig_master_host=10.150.20.90 --orig_master_ip=10.150.20.90 --orig_master_port=33061 --orig_master_user='mha_monitor' --new_master_host=10.150.20.97 --new_master_ip=10.150.20.97 --new_master_port=33061 --new_master_user='mha_monitor' --orig_master_ssh_user=root --new_master_ssh_user=root --orig_master_is_new_slave --orig_master_password=xxx --new_master_password=xxx
Wed Dec 12 16:48:51 2018 875301 Set read_only=0 on the new master.
Enabling the VIP - 10.150.20.200 on the new master - 10.150.20.97 
Wed Dec 12 16:48:52 2018 - [info] ok.
Wed Dec 12 16:48:52 2018 - [info] 
Wed Dec 12 16:48:52 2018 - [info] * Switching slaves in parallel..
Wed Dec 12 16:48:52 2018 - [info] 
Wed Dec 12 16:48:52 2018 - [info] -- Slave switch on host 10.150.20.132(10.150.20.132:33061) started, pid: 28145
Wed Dec 12 16:48:52 2018 - [info] 
Wed Dec 12 16:48:53 2018 - [info] Log messages from 10.150.20.132 ...
Wed Dec 12 16:48:53 2018 - [info] 
Wed Dec 12 16:48:52 2018 - [info] Waiting to execute all relay logs on 10.150.20.132(10.150.20.132:33061)..
Wed Dec 12 16:48:52 2018 - [info] master_pos_wait(mysql-bin.000009:154) completed on 10.150.20.132(10.150.20.132:33061). Executed 0 events.
Wed Dec 12 16:48:52 2018 - [info] done.
Wed Dec 12 16:48:52 2018 - [info] Resetting slave 10.150.20.132(10.150.20.132:33061) and starting replication from the new master 10.150.20.97(10.150.20.97:33061)..
Wed Dec 12 16:48:52 2018 - [info] Executed CHANGE MASTER.
Wed Dec 12 16:48:52 2018 - [info] Slave started.
Wed Dec 12 16:48:53 2018 - [info] End of log messages from 10.150.20.132 ...
Wed Dec 12 16:48:53 2018 - [info] 
Wed Dec 12 16:48:53 2018 - [info] -- Slave switch on host 10.150.20.132(10.150.20.132:33061) succeeded.
Wed Dec 12 16:48:53 2018 - [info] Unlocking all tables on the orig master:
Wed Dec 12 16:48:53 2018 - [info] Executing UNLOCK TABLES..
Wed Dec 12 16:48:53 2018 - [info] ok.
Wed Dec 12 16:48:53 2018 - [info] Starting orig master as a new slave..
Wed Dec 12 16:48:53 2018 - [info] Resetting slave 10.150.20.90(10.150.20.90:33061) and starting replication from the new master 10.150.20.97(10.150.20.97:33061)..
Wed Dec 12 16:48:53 2018 - [info] Executed CHANGE MASTER.
Wed Dec 12 16:48:53 2018 - [info] Slave started.
Wed Dec 12 16:48:53 2018 - [info] All new slave servers switched successfully.
Wed Dec 12 16:48:53 2018 - [info] 
Wed Dec 12 16:48:53 2018 - [info] * Phase 5: New master cleanup phase..
Wed Dec 12 16:48:53 2018 - [info] 
Wed Dec 12 16:48:53 2018 - [info] 10.150.20.97: Resetting slave info succeeded.
Wed Dec 12 16:48:53 2018 - [info] Switching master to 10.150.20.97(10.150.20.97:33061) completed successfully.
切换过程

此时，查看新主ed3jrdba97的信息

# ifconfig ens3:1
ens3:1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 10.150.20.200 netmask 255.255.255.0 broadcast 10.150.20.255
ether 54:52:00:49:48:92 txqueuelen 1000 (Ethernet)
root@(none) 04:50:08>show processlist;
+----+------------+---------------------+------+-------------+------+---------------------------------------------------------------+------------------+
| Id | User | Host | db | Command | Time | State | Info |
+----+------------+---------------------+------+-------------+------+---------------------------------------------------------------+------------------+
| 13 | root      | localhost | NULL | Sleep | 755 | | NULL |
| 36 | replicator  | 10.150.20.132:38717 | NULL | Binlog Dump | 79 | Master has sent all binlog to slave; waiting for more updates | NULL |
| 37 | replicator  | 10.150.20.90:15003 | NULL | Binlog Dump | 78 | Master has sent all binlog to slave; waiting for more updates | NULL |
| 38 | root     | localhost | NULL | Query | 0 | starting | show processlist |
+----+------------+---------------------+------+-------------+------+---------------------------------------------------------------+------------------+
4 rows in set (0.00 sec)

manager节点：
# masterha_check_repl --conf=/etc/mysql_mha/app1.cnf

Wed Dec 12 16:51:22 2018 - [info] Reading default configuration from /etc/masterha_default.cnf..
Wed Dec 12 16:51:22 2018 - [info] Reading application default configuration from /etc/mysql_mha/app1.cnf..
Wed Dec 12 16:51:22 2018 - [info] Reading server configuration from /etc/mysql_mha/app1.cnf..
Wed Dec 12 16:51:22 2018 - [info] MHA::MasterMonitor version 0.58.
Wed Dec 12 16:51:23 2018 - [info] GTID failover mode = 0
Wed Dec 12 16:51:23 2018 - [info] Dead Servers:
Wed Dec 12 16:51:23 2018 - [info] Alive Servers:
Wed Dec 12 16:51:23 2018 - [info] 10.150.20.90(10.150.20.90:33061)
Wed Dec 12 16:51:23 2018 - [info] 10.150.20.97(10.150.20.97:33061)
Wed Dec 12 16:51:23 2018 - [info] 10.150.20.132(10.150.20.132:33061)
Wed Dec 12 16:51:23 2018 - [info] Alive Slaves:
Wed Dec 12 16:51:23 2018 - [info] 10.150.20.90(10.150.20.90:33061) Version=5.7.21-log (oldest major version between slaves) log-bin:enabled
Wed Dec 12 16:51:23 2018 - [info] Replicating from 10.150.20.97(10.150.20.97:33061)
Wed Dec 12 16:51:23 2018 - [info] 10.150.20.132(10.150.20.132:33061) Version=5.7.21-log (oldest major version between slaves) log-bin:enabled
Wed Dec 12 16:51:23 2018 - [info] Replicating from 10.150.20.97(10.150.20.97:33061)
Wed Dec 12 16:51:23 2018 - [info] Current Alive Master: 10.150.20.97(10.150.20.97:33061)
Wed Dec 12 16:51:23 2018 - [info] Checking slave configurations..
Wed Dec 12 16:51:23 2018 - [info] read_only=1 is not set on slave 10.150.20.132(10.150.20.132:33061).
Wed Dec 12 16:51:23 2018 - [info] Checking replication filtering settings..
Wed Dec 12 16:51:23 2018 - [info] binlog_do_db= , binlog_ignore_db= 
Wed Dec 12 16:51:23 2018 - [info] Replication filtering check ok.
Wed Dec 12 16:51:23 2018 - [info] GTID (with auto-pos) is not supported
Wed Dec 12 16:51:23 2018 - [info] Starting SSH connection tests..
Wed Dec 12 16:51:26 2018 - [info] All SSH connection tests passed successfully.
Wed Dec 12 16:51:26 2018 - [info] Checking MHA Node version..
Wed Dec 12 16:51:27 2018 - [info] Version check ok.
Wed Dec 12 16:51:27 2018 - [info] Checking SSH publickey authentication settings on the current master..
Wed Dec 12 16:51:27 2018 - [info] HealthCheck: SSH to 10.150.20.97 is reachable.
Wed Dec 12 16:51:27 2018 - [info] Master MHA Node version is 0.58.
Wed Dec 12 16:51:27 2018 - [info] Checking recovery script configurations on 10.150.20.97(10.150.20.97:33061)..
Wed Dec 12 16:51:27 2018 - [info] Executing command: save_binary_logs --command=test --start_pos=4 --binlog_dir=/data/mysql_33061/logs --output_file=/data/mysql_mha/app1/save_binary_logs_test --manager_version=0.58 --start_file=mysql-bin.000014 
Wed Dec 12 16:51:27 2018 - [info] Connecting to root@10.150.20.97(10.150.20.97:22).. 
Creating /data/mysql_mha/app1 if not exists.. ok.
Checking output directory is accessible or not..
ok.
Binlog found at /data/mysql_33061/logs, up to mysql-bin.000014
Wed Dec 12 16:51:27 2018 - [info] Binlog setting check done.
Wed Dec 12 16:51:27 2018 - [info] Checking SSH publickey authentication and checking recovery script configurations on all alive slave servers..
Wed Dec 12 16:51:27 2018 - [info] Executing command : apply_diff_relay_logs --command=test --slave_user='mha_monitor' --slave_host=10.150.20.90 --slave_ip=10.150.20.90 --slave_port=33061 --workdir=/data/mysql_mha/app1 --target_version=5.7.21-log --manager_version=0.58 --relay_log_info=/data/mysql_33061/logs/relay-log.info --relay_dir=/data/mysql_33061/data/ --slave_pass=xxx
Wed Dec 12 16:51:27 2018 - [info] Connecting to root@10.150.20.90(10.150.20.90:22).. 
Checking slave recovery environment settings..
Opening /data/mysql_33061/logs/relay-log.info ... ok.
Relay log found at /data/mysql_33061/logs, up to relaylog.000002
Temporary relay log file is /data/mysql_33061/logs/relaylog.000002
Checking if super_read_only is defined and turned on.. not present or turned off, ignoring.
Testing mysql connection and privileges..
mysql: [Warning] Using a password on the command line interface can be insecure.
done.
Testing mysqlbinlog output.. done.
Cleaning up test file(s).. done.
Wed Dec 12 16:51:27 2018 - [info] Executing command : apply_diff_relay_logs --command=test --slave_user='mha_monitor' --slave_host=10.150.20.132 --slave_ip=10.150.20.132 --slave_port=33061 --workdir=/data/mysql_mha/app1 --target_version=5.7.21-log --manager_version=0.58 --relay_log_info=/data/mysql_33061/logs/relay-log.info --relay_dir=/data/mysql_33061/data/ --slave_pass=xxx
Wed Dec 12 16:51:27 2018 - [info] Connecting to root@10.150.20.132(10.150.20.132:22).. 
Checking slave recovery environment settings..
Opening /data/mysql_33061/logs/relay-log.info ... ok.
Relay log found at /data/mysql_33061/data, up to cgdb-relay-bin.000002
Temporary relay log file is /data/mysql_33061/data/cgdb-relay-bin.000002
Checking if super_read_only is defined and turned on.. not present or turned off, ignoring.
Testing mysql connection and privileges..
mysql: [Warning] Using a password on the command line interface can be insecure.
done.
Testing mysqlbinlog output.. done.
Cleaning up test file(s).. done.
Wed Dec 12 16:51:28 2018 - [info] Slaves settings check done.
Wed Dec 12 16:51:28 2018 - [info] 
10.150.20.97(10.150.20.97:33061) (current master)
+--10.150.20.90(10.150.20.90:33061)
+--10.150.20.132(10.150.20.132:33061)

Wed Dec 12 16:51:28 2018 - [info] Checking replication health on 10.150.20.90..
Wed Dec 12 16:51:28 2018 - [info] ok.
Wed Dec 12 16:51:28 2018 - [info] Checking replication health on 10.150.20.132..
Wed Dec 12 16:51:28 2018 - [info] ok.
Wed Dec 12 16:51:28 2018 - [info] Checking master_ip_failover_script status:
Wed Dec 12 16:51:28 2018 - [info] /usr/local/bin/master_ip_failover --command=status --ssh_user=root --orig_master_host=10.150.20.97 --orig_master_ip=10.150.20.97 --orig_master_port=33061


IN SCRIPT TEST====/usr/sbin/ip addr del 10.150.20.200/24 dev ens3 label ens3:1==/usr/sbin/ip addr add 10.150.20.200/24 brd 10.150.20.255 dev ens3 label ens3:1;/usr/sbin/arping -q -A -c 1 -I ens3 10.150.20.200;iptables -F;===

Checking the Status of the script.. OK 
Wed Dec 12 16:51:28 2018 - [info] OK.
Wed Dec 12 16:51:28 2018 - [warning] shutdown_script is not defined.
Wed Dec 12 16:51:28 2018 - [info] Got exit code 0 (Not master dead).

MySQL Replication Health is OK.
复制环境检查

可以看到当前的架构：

10.150.20.97(10.150.20.97:33061) (current master)
+--10.150.20.90(10.150.20.90:33061)
+--10.150.20.132(10.150.20.132:33061)

启动 mha manager
switchover成功后，修改/etc/mysql_mha/app1.cnf，然后再启动 mha manager
启动 manager

# nohup masterha_manager --conf=/etc/mysql_mha/app1.cnf --remove_dead_master_conf --ignore_last_failover < /dev/null > /data/mysql_mha/app1-manager.log 2>&1 &

查看 manager status

# masterha_check_status --conf=/etc/mysql_mha/app1.cnf

查看 manager log

# tail -n 1000 -f /var/log/mysql_mha/app1-manager.log


switchover的过程，基本为以下步骤：

1.检测复制设置和确定当前主服务器
2.确定新的主服务器
3.阻塞写入到当前主服务器
4.等待所有从服务器赶上复制
5.授予写入到新的主服务器
6.重新设置从服务器

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原文地址：https://www.cnblogs.com/elontian/p/10095235.html