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/usr/bin/masterha_manager is in mha4mysql-manager 0.55-1.

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#!/usr/bin/env perl

#  Copyright (C) 2011 DeNA Co.,Ltd.
#
#  This program is free software; you can redistribute it and/or modify
#  it under the terms of the GNU General Public License as published by
#  the Free Software Foundation; either version 2 of the License, or
#  (at your option) any later version.
#
#  This program is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.
#
#  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

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

use English qw(-no_match_vars);
use Getopt::Long qw(:config pass_through);
use Pod::Usage;
use MHA::MasterMonitor;
use MHA::MasterFailover;
use MHA::ManagerConst;

my $help;
my $version;

$| = 1;

GetOptions(
  'help'    => \$help,
  'version' => \$version,
);

if ($version) {
  print "masterha_manager version $MHA::ManagerConst::VERSION.\n";
  exit 0;
}

if ($help) {
  pod2usage(0);
}

my @ORIG_ARGV = @ARGV;
my ( $exit_code, $dead_master, $ssh_reachable ) =
  MHA::MasterMonitor::main( "--interactive=0", @ARGV );

if ( $exit_code && $exit_code != $MHA::ManagerConst::MASTER_DEAD_RC ) {
  exit $exit_code;
}
if ( !$dead_master->{hostname}
  || !$dead_master->{ip}
  || !$dead_master->{port}
  || !defined($ssh_reachable) )
{
  exit 1;
}

@ARGV      = @ORIG_ARGV;
$exit_code = MHA::MasterFailover::main(
  "--master_state=dead",
  "--interactive=0",
  "--dead_master_host=$dead_master->{hostname}",
  "--dead_master_ip=$dead_master->{ip}",
  "--dead_master_port=$dead_master->{port}",
  "--ssh_reachable=$ssh_reachable",
  @ARGV
);

exit $exit_code;

# ############################################################################
# Documentation
# ############################################################################

=pod

=head1 NAME

masterha_manager - Monitoring MySQL master server availability and do failover if it detects master failure

=head1 SYNOPSIS

masterha_manager --global_conf=/etc/masterha_default.cnf --conf=/usr/local/masterha/conf/app1.cnf 

See online reference (http://code.google.com/p/mysql-master-ha/wiki/masterha_manager) for details.

=head1 DESCRIPTION

See online reference (http://code.google.com/p/mysql-master-ha/wiki/masterha_manager) for details.