poolmonitor.in 4.98 KB
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#!/usr/bin/perl -w
#
# Copyright (c) 2008-2013 University of Utah and the Flux Group.
# 
# {{{GENIPUBLIC-LICENSE
# 
# GENI Public License
# 
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and/or hardware specification (the "Work") to
# deal in the Work without restriction, including without limitation the
# rights to use, copy, modify, merge, publish, distribute, sublicense,
# and/or sell copies of the Work, and to permit persons to whom the Work
# is furnished to do so, subject to the following conditions:
# 
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Work.
# 
# THE WORK IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
# OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
# HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
# WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE WORK OR THE USE OR OTHER DEALINGS
# IN THE WORK.
# 
# }}}
#
use strict;
use English;
use Getopt::Std;
use Data::Dumper;

#
# Watch the shared node pool, looking for dead puppies. Does a simple ssh
# with timeout and if it times out or has an error, we send word that
# the node is dead. Report aggregate list once a day.
#
sub usage()
{
    print "Usage: poolmonitor [-d] [-s]\n";
    print "Options:\n";
    print "  -d    - Run in foreground, do not daemonize.\n";
    print "  -s    - Run once and exit.\n";
    exit(1);
}
my $optlist   = "ds";
my $debug     = 0;
my $oneshot   = 0;

#
# Configure variables
#
my $TB		  = "@prefix@";
my $TBOPS         = "@TBOPSEMAIL@";
my $LOGFILE       = "$TB/log/poolmonitor.log";
my $SLEEP_INTERVAL= 300;

# Lets not warn more then once a day.
my %warned    = ();
my $lastmail  = time();

# un-taint path
$ENV{'PATH'} = '/bin:/usr/bin:/usr/local/bin:/usr/site/bin';
delete @ENV{'IFS', 'CDPATH', 'ENV', 'BASH_ENV'};

# Protos
sub fatal($);
	  
#
# Turn off line buffering on output
#
$| = 1; 

if ($UID != 0) {
    fatal("Must be root to run this script\n");
}

#
# Check args early so we get the right DB.
#
my %options = ();
if (! getopts($optlist, \%options)) {
    usage();
}
if (defined($options{"d"})) {
    $debug++;
}
if (defined($options{"s"})) {
    $oneshot = 1;
}

# Load the Testbed support stuff.
use lib "@prefix@/lib";
use libtestbed;
use emdb;
use Experiment;
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use EmulabConstants;
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use Node;
use emutil;
use libEmulab;

if (!$oneshot) {
    if (CheckDaemonRunning("poolmonitor")) {
	fatal("Not starting another poolmonitor daemon!");
    }
    # Go to ground.
    if (! $debug) {
	if (TBBackGround($LOGFILE)) {
	    exit(0);
	}
    }
    if (MarkDaemonRunning("poolmonitor")) {
	fatal("Could not mark daemon as running!");
    }
}

#
# Setup a signal handler for newsyslog.
#
sub handler()
{
    my $SAVEEUID = $EUID;
    
    $EUID = 0;
    ReOpenLog($LOGFILE);
    $EUID = $SAVEEUID;
}
$SIG{HUP} = \&handler
    if (! ($debug || $oneshot));

print "Pool Monitor starting... pid $$, at ".`date`;

while (1) {
    if (NoLogins()) {
	sleep(5);
	next;
    }
    print "Running at ".
	POSIX::strftime("20%y-%m-%d %H:%M:%S", localtime()) . "\n";

    my $query_result =
	DBQueryWarn("select r.node_id from reserved as r ".
		    "left join nodes as n on n.node_id=r.node_id ".
		    "left join node_types as t on t.type=n.type ".
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		    "left join experiments as e on e.idx=r.exptidx ".
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		    "where sharing_mode is not null and ".
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		    "      e.state='" . EXPTSTATE_ACTIVE() . "' and ".
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		    "      n.node_id=n.phys_nodeid and t.class='pc'");
    goto skip
	if (!$query_result || !$query_result->numrows);

    while (my ($node_id) = $query_result->fetchrow_array()) {
	print "Checking to see if $node_id is reactive ...\n";
	my $status = SSHwithTimeout($node_id, "ls / > /dev/null", 15, $debug);
	if ($status) {
	    print "--> $node_id is down for the count!\n";
	    if (!exists($warned{$node_id})) {
		SENDMAIL($TBOPS,
			 "Shared node $node_id is unresponsive",
			 "Shared node $node_id is unresponsive",
			 $TBOPS);
		$warned{$node_id} = time();
	    }
	}
	else {
	    print "--> $node_id appears to be alive and kicking!\n";
	    delete($warned{$node_id})
		if (exists($warned{$node_id}));
	}
	sleep(1);
    }
    #
    # Warn of all nodes down once a day.
    #
    if (keys(%warned) && (time() - $lastmail) > (24 * 3600)) {
	my @nodes = keys(%warned);
	print "Nodes still unresponsive after (another) 24 hours: @nodes\n";
	SENDMAIL($TBOPS,
		 "WARNING: unresponsive shared nodes",
		 "Nodes still unresponsive after (another) 24 hours:\n" .
		 "@nodes\n",
		 $TBOPS);
	$lastmail = time();
    }
    if ($oneshot) {
	exit(0);
    }
  skip:
    sleep($SLEEP_INTERVAL);
}

sub fatal($)
{
    my ($msg) = @_;

    #
    # Send a message to the testbed list. 
    #
    SENDMAIL($TBOPS,
	     "Pool monitor daemon died",
	     $msg,
	     $TBOPS);
    MarkDaemonStopped("poolmonitor");
    die("*** $0:\n".
	"    $msg\n");
}