/usr/share/perl5/MMM/Monitor/Checker/Checks.pm is in mysql-mmm-monitor 2.2.1-1.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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use strict;
use warnings FATAL => 'all';
use English qw(OSNAME EFFECTIVE_USER_ID);
use DBI;
use Net::Ping;
use POSIX ':signal_h';
our $VERSION = '0.01';
=head1 NAME
MMM::Monitor::Checker::Checks - functions for the B<mmm_mond> helper program B<checker>
=cut
my $fping_path;
=head1 FUNCTIONS
=over 4
=item ping($timeout, $host)
Check if the host $host is reachable.
=cut
sub ping($$) {
my $timeout = shift;
my $host = shift;
my $ip = $main::config->{host}->{$host}->{ip};
return "ERROR: Invalid host '$host'" unless ($ip);
# if super user, use Net::Ping - it's faster
if ($EFFECTIVE_USER_ID == 0) {
my $p = Net::Ping->new('icmp');
$p->hires();
if ($p->ping($ip, 0.5)) {
return 'OK';
}
return "ERROR: Could not ping $ip";
}
# Find appropriate fping version
_determine_fping_path() unless defined($fping_path);
unless (defined($fping_path)) {
return "ERROR: fping is not functional - please, install your own version of fping on this server!";
}
my $res = `$fping_path -q -u -t 500 -C 1 $ip 2>&1`;
return "ERROR: fping could not reach $ip" if ($res =~ /$ip.*\-$/);
return 'OK';
}
=item ping_ip($timeout, $ip)
Check if the IP $ip is reachable.
=cut
sub ping_ip($$) {
my $timeout = shift;
my $ip = shift;
# if super user, use Net::Ping - it's faster
if ($EFFECTIVE_USER_ID == 0) {
my $p = Net::Ping->new('icmp');
$p->hires();
if ($p->ping($ip, 0.5)) {
return 'OK';
}
return "ERROR: Could not ping $ip";
}
# Find appropriate fping version
_determine_fping_path() unless defined($fping_path);
unless (defined($fping_path)) {
return "ERROR: fping is not functional - please, install your own version of fping on this server!";
}
my $res = `$fping_path -q -u -t 500 -C 1 $ip 2>&1`;
return "ERROR: fping could not reach $ip" if ($res =~ /$ip.*\-$/);
return 'OK';
}
=item mysql($timeout, $host)
Check if the mysql server on host $host is reachable.
=cut
sub mysql($$) {
my $timeout = shift;
my $host = shift;
my ($peer_host, $peer_port, $peer_user, $peer_password) = _get_connection_info($host);
return "ERROR: Invalid host '$host'" unless ($peer_host);
my $mask = POSIX::SigSet->new( SIGALRM );
my $action = POSIX::SigAction->new(
sub { die 'TIMEOUT'; },
$mask,
);
my $oldaction = POSIX::SigAction->new();
sigaction( SIGALRM, $action, $oldaction );
my $res = eval {
alarm($timeout + 1);
# connect to server
my $dsn = "DBI:mysql:host=$peer_host;port=$peer_port;mysql_connect_timeout=$timeout";
my $dbh = DBI->connect($dsn, $peer_user, $peer_password, { PrintError => 0 });
unless ($dbh) {
alarm(0);
# We don't want to trigger any action because of a simple 'too many connections' error
return "UNKNOWN: Too many connections! " . $DBI::errstr if ($DBI::err == 1040);
return "ERROR: Connect error (host = $peer_host:$peer_port, user = $peer_user)! " . $DBI::errstr;
}
# Check server (simple)
my $res = $dbh->do('SELECT NOW()');
unless ($res) {
alarm(0);
return 'ERROR: SQL Query Error: ' . $dbh->errstr;
}
alarm(1);
$dbh->disconnect();
$dbh = undef;
alarm(0);
return 0;
};
alarm(0);
return $res if ($res);
return 'ERROR: Timeout' if ($@ =~ /^TIMEOUT/);
return "UNKNOWN: Error occurred: $@" if $@;
return 'OK';
}
=item rep_backlog($timeout, $host)
Check the replication backlog on host $host.
=cut
sub rep_backlog($$) {
my $timeout = shift;
my $host = shift;
my ($peer_host, $peer_port, $peer_user, $peer_password) = _get_connection_info($host);
return "ERROR: Invalid host '$host'" unless ($peer_host);
my $mask = POSIX::SigSet->new( SIGALRM );
my $action = POSIX::SigAction->new(
sub { die 'TIMEOUT'; },
$mask,
);
my $oldaction = POSIX::SigAction->new();
sigaction( SIGALRM, $action, $oldaction );
my $res = eval {
alarm($timeout + 1);
# connect to server
my $dsn = "DBI:mysql:host=$peer_host;port=$peer_port;mysql_connect_timeout=$timeout";
my $dbh = DBI->connect($dsn, $peer_user, $peer_password, { PrintError => 0 });
unless ($dbh) {
alarm(0);
return "UNKNOWN: Connect error (host = $peer_host:$peer_port, user = $peer_user)! " . $DBI::errstr;
}
# Check server (replication backlog)
my $sth = $dbh->prepare('SHOW SLAVE STATUS');
my $res = $sth->execute;
if ($dbh->err) {
alarm(1);
my $ret = 'UNKNOWN: Unknown state. Execute error: ' . $dbh->errstr;
$ret = "ERROR: The monitor user '$peer_user' doesn't have the required REPLICATION CLIENT privilege! " . $dbh->errstr if ($dbh->err == 1227);
$sth->finish();
$dbh->disconnect();
$dbh = undef;
alarm(0);
return $ret;
}
unless ($res) {
alarm(1);
$sth->finish();
$dbh->disconnect();
$dbh = undef;
alarm(0);
return 'ERROR: Replication is not running';
}
my $status = $sth->fetchrow_hashref;
alarm(1);
$sth->finish();
$dbh->disconnect();
$dbh = undef;
alarm(0);
return 'ERROR: Replication is not set up' unless defined($status);
# Check backlog size
my $backlog = $status->{Seconds_Behind_Master};
$backlog = 0 unless ($backlog);
return 'OK: Backlog is null' if ($backlog == 0);
return 'ERROR: Backlog is too big' if ($backlog > $main::check->{max_backlog});
return 0;
};
alarm(0);
return $res if ($res);
return 'ERROR: Timeout' if ($@ =~ /^TIMEOUT/);
return "UNKNOWN: Error occurred: $@" if $@;
return 'OK';
}
=item rep_threads($timeout, $host)
Check if the mysql slave threads on host $host are running.
=cut
sub rep_threads($$) {
my $timeout = shift;
my $host = shift;
my ($peer_host, $peer_port, $peer_user, $peer_password) = _get_connection_info($host);
return "ERROR: Invalid host '$host'" unless ($peer_host);
my $mask = POSIX::SigSet->new( SIGALRM );
my $action = POSIX::SigAction->new(
sub { die 'TIMEOUT'; },
$mask,
);
my $oldaction = POSIX::SigAction->new();
sigaction( SIGALRM, $action, $oldaction );
my $res = eval {
alarm($timeout + 1);
# connect to server
my $dsn = "DBI:mysql:host=$peer_host;port=$peer_port;mysql_connect_timeout=$timeout";
my $dbh = DBI->connect($dsn, $peer_user, $peer_password, { PrintError => 0 });
return "UNKNOWN: Connect error (host = $peer_host:$peer_port, user = $peer_user)! " . $DBI::errstr unless ($dbh);
# Check server (replication backlog)
my $sth = $dbh->prepare('SHOW SLAVE STATUS');
my $res = $sth->execute;
if ($dbh->err) {
alarm(1);
my $ret = 'UNKNOWN: Unknown state. Execute error: ' . $dbh->errstr;
$ret = "ERROR: The monitor user '$peer_user' doesn't have the required REPLICATION CLIENT privilege! " . $dbh->errstr if ($dbh->err == 1227);
$sth->finish();
$dbh->disconnect();
$dbh = undef;
alarm(0);
return $ret;
}
unless ($res) {
alarm(1);
$sth->finish();
$dbh->disconnect();
$dbh = undef;
alarm(0);
return 'ERROR: Replication is not running';
}
my $status = $sth->fetchrow_hashref;
alarm(1);
$sth->finish();
$dbh->disconnect();
$dbh = undef;
alarm(0);
return 'ERROR: Replication is not set up' unless defined($status);
# Check peer replication state
if ($status->{Slave_IO_Running} eq 'No' || $status->{Slave_SQL_Running} eq 'No') {
return 'ERROR: Replication is broken';
}
return 0;
};
alarm(0);
return $res if ($res);
return 'ERROR: Timeout' if ($@ =~ /^TIMEOUT/);
return "UNKNOWN: Error occurred: $@" if $@;
return 'OK';
}
=item _get_connection_info($host)
Get connection info for host $host.
=cut
sub _get_connection_info($) {
my $host = shift;
return (
$main::config->{host}->{$host}->{ip},
$main::config->{host}->{$host}->{mysql_port},
$main::config->{host}->{$host}->{monitor_user},
$main::config->{host}->{$host}->{monitor_password}
);
}
=item _determine_fping_path()
Determine path of fping binary
=cut
sub _determine_fping_path() {
$fping_path = _determine_path('fping');
}
sub _determine_path($) {
my $program = shift;
my @paths = qw(/usr/sbin /sbin /usr/bin /bin);
foreach my $path (@paths) {
my $fullpath = "$path/$program";
if (-f $fullpath && -x $fullpath) {
return $fullpath;
}
}
return undef;
}
1;
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