mha配置

1、关闭主从库relay_log_purge

mysql> set global relay_log_purge=0;

2、切换脚本

[root@localhost ~]# cat /mha-manager/bin/master_ip_failover

#!/usr/bin/env perl

#  Copyright (C) 2011 DeNA Co.,Ltd.
#  You should have received a copy of the GNU General Public License
#   along with this program; if not, write to the Free Software
#  Foundation, Inc.,
#  51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA

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

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

use Getopt::Long;
use MHA::DBHelper;

my (
  $command,        $ssh_user,         $orig_master_host,
  $orig_master_ip, $orig_master_port, $new_master_host,
  $new_master_ip,  $new_master_port,  $new_master_user,
  $new_master_password
);

my $vip = '172.16.107.30/24';
my $key = '88';
my $ssh_start_vip = "/sbin/ifconfig eth0:$key $vip";
my $ssh_stop_vip = "/sbin/ifconfig eth0:$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,
  'new_master_user=s'     => \$new_master_user,
  'new_master_password=s' => \$new_master_password,
);

exit &main();

sub main {
    print "\n\nIN SCRIPT TEST====$ssh_stop_vip==$ssh_start_vip===\n\n";
    if ( $command eq "stop" || $command eq "stopssh" ) {
        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" ) {
        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";
        exit 0;
    }
    else {
        &usage();
        exit 1;
    }
}
sub start_vip() {
    `ssh $ssh_user\@$new_master_host \" $ssh_start_vip \"`;
}
sub stop_vip() {
     return 0  unless  ($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";
}

按需修改：my $vip = '172.16.107.30/24'

   陪完脚本后配置VIP

ifconfig eth0:88 172.16.107.30/24
ifconfig eth0:88 down

 

3、修改默认设置[root@localhost ~]# cat /etc/masterha_default.cnf

[server default]
user=root
password=123456
ssh_user=root
repl_user=slave
repl_password= 123456
ping_interval=1

4、数据库集群切换配置[root@localhost ~]# cat /mha-manager/etc/app1.cnf

[server default]
manager_log=/mha-manager/log/manager.log
manager_workdir=/mha-manager/app1
master_ip_failover_script=/mha-manager/bin/master_ip_failover
[serverr1]
candidate_master=1
check_repl_delay=0
hostname=172.16.107.18
master_binlog_dir=/var/lib/mysql/
port=3306
[server2]
candidate_master=1
check_repl_delay=0
hostname=172.16.107.16
master_binlog_dir=/var/lib/mysql/
port=3306
[server3]
hostname=172.16.107.20
master_binlog_dir=/var/lib/mysql/
port=3306

5、检查ssh免密登录是否正常,检查主从复制是否正常
1)masterha_check_ssh --conf=/mha-manager/etc/app1.cnf
2)masterha_check_repl --conf=/mha-manager/etc/app1.cnf

6、后台运行masterha_manager，然后检查masterha_manager是否正常
1)nohup masterha_manager --conf=/mha-manager/etc/app1.cnf --remove_dead_master_conf --ignore_last_failover < /dev/null > /mha-manager/log/manager.log 2>&1 &
2)masterha_check_status --conf=/mha-manager/etc/app1.cnf

 

7、手动切换(需要关闭masterha_manager)

masterha_master_switch --conf=/mha-manager/etc/app1.cnf --master_state=alive --new_master_host=172.16.107.18 --new_master_port=3306 --orig_master_is_new_slave --running_updates_limit=100