mysql> install plugin rpl_semi_sync_master soname 'semisync_master.so';

mysql> set global rpl_semi_sync_master_enabled=1;

mysql> set global rpl_semi_sync_master_timeout=1000;

mysql> show global status like 'rpl%';

mysql> install plugin rpl_semi_sync_master soname 'semisync_master.so';

mysql> set global rpl_semi_sync_master_enabled=1;

mysql> set global rpl_semi_sync_master_timeout=1000;

mysql> install plugin rpl_semi_sync_slave soname 'semisync_slave.so';

mysql> set global rpl_semi_sync_slave_enabled=1;

mysql> install plugin rpl_semi_sync_slave soname 'semisync_slave.so';

mysql> set global rpl_semi_sync_slave_enabled=1;

mysql> change master to master_host="172.16.21.23",master_user="repl",master_password="repl",master_log_file="bin-log.000001",master_log_pos=255;

mysql> grant replication slave on *.* to repl@'172.16.21.%' identified by 'repl';

[server default]

manager_workdir=/masterha/app1

manager_log=/masterha/app1/manager.log

#remote_workdir=/usr/local/mysql

#mysql user and password

user=root

password=root

ssh_user=root

repl_user=repl

repl_password=repl

ping_interval=1

shutdown_script=""

#master_ip_failover_script=/usr/local/bin/master_ip_failover

#master_ip_online_change_script=/usr/local/bin/master_ip_online_change_script

#report_script=""

[server1]

hostname=master

master_binlog_dir=/var/log/mysql

candidate_master=1

[server2]

hostname=172.16.21.50

master_binlog_dir=/var/log/mysql

candidate_master=1

[server3]

hostname=172.16.21.48

master_binlog_dir=/var/log/mysql

no_master=1

mysql> grant all on *.* to root@'172.16.21.15' identified by 'root';

mysql> grant all on *.* to root@'172.16.21.23' identified by 'root';

mysql> grant all on *.* to root@'172.16.21.50' identified by 'root';

mysql> grant all on *.* to root@'172.16.21.48' identified by 'root';

mysql> grant all on *.* to root@'172.16.21.%' identified by 'root';

masterha_master_switch --conf=/etc/app1.cnf --master_state=dead --dead_master_host=...

masterha_master_switch --conf=/etc/app1.cnf --master_state=alive --new_master_host=...

--orig_master_host=(dead master's hostname)

--new_master_host=(new master's hostname)

--new_slave_hosts=(new slaves' hostnames, delimited by commas)

--subject=(mail subject)

--body=(body)

#!/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 = '172.16.21.119/24';  # Virtual IP

my $key = "1";

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,

);

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\@cluster1 \" $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";

}