#!/usr/bin/perl
# Housekeeping program, started by cron, loncontrol and loncron.pl
#
# $Id: loncron,v 1.66 2006/02/06 09:08:56 albertel Exp $
#
# Copyright Michigan State University Board of Trustees
#
# This file is part of the LearningOnline Network with CAPA (LON-CAPA).
#
# LON-CAPA 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.
#
# LON-CAPA 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 LON-CAPA; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
# /home/httpd/html/adm/gpl.txt
#
# http://www.lon-capa.org/
#
$|=1;
use strict;
use lib '/home/httpd/lib/perl/';
use LONCAPA::Configuration;
use IO::File;
use IO::Socket;
use HTML::Entities;
use Getopt::Long;
#globals
use vars qw (%perlvar %simplestatus $errors $warnings $notices $totalcount);
my $statusdir="/home/httpd/html/lon-status";
# -------------------------------------------------- Non-critical communication
sub reply {
my ($cmd,$server,$hostname)=@_;
my $peerfile="$perlvar{'lonSockDir'}/".$hostname->{$server};
my $client=IO::Socket::UNIX->new(Peer =>"$peerfile",
Type => SOCK_STREAM,
Timeout => 10)
or return "con_lost";
print $client "sethost:$server:$cmd\n";
my $answer=<$client>;
chomp($answer);
if (!$answer) { $answer="con_lost"; }
return $answer;
}
# --------------------------------------------------------- Output error status
sub log {
my $fh=shift;
if ($fh) { print $fh @_ }
}
sub errout {
my $fh=shift;
&log($fh,(<<ENDERROUT));
<table border="2" bgcolor="#CCCCCC">
<tr><td>Notices</td><td>$notices</td></tr>
<tr><td>Warnings</td><td>$warnings</td></tr>
<tr><td>Errors</td><td>$errors</td></tr>
</table><p><a href="#top">Top</a></p>
ENDERROUT
}
sub start_daemon {
my ($fh,$daemon,$pidfile,$args) = @_;
my $progname=$daemon;
if ($daemon eq 'lonc' && $args eq 'new') {
$progname='loncnew';
print "new ";
}
my $error_fname="$perlvar{'lonDaemons'}/logs/${daemon}_errors";
my $size=(stat($error_fname))[7];
if ($size>40000) {
&log($fh,"<p>Rotating error logs ...</p>");
rename("$error_fname.2","$error_fname.3");
rename("$error_fname.1","$error_fname.2");
rename("$error_fname","$error_fname.1");
}
system("$perlvar{'lonDaemons'}/$progname 2>$perlvar{'lonDaemons'}/logs/${daemon}_errors");
sleep 1;
if (-e $pidfile) {
&log($fh,"<p>Seems like it started ...</p>");
my $lfh=IO::File->new("$pidfile");
my $daemonpid=<$lfh>;
chomp($daemonpid);
if ($daemonpid =~ /^\d+$/ && kill 0 => $daemonpid) {
return 1;
} else {
return 0;
}
}
&log($fh,"<p>Seems like that did not work!</p>");
$errors++;
return 0;
}
sub checkon_daemon {
my ($fh,$daemon,$maxsize,$send,$args)=@_;
my $result;
&log($fh,'<hr /><a name="'.$daemon.'" /><h2>'.$daemon.'</h2><h3>Log</h3><p style="white-space: pre;"><tt>');
printf("%-15s ",$daemon);
if (-e "$perlvar{'lonDaemons'}/logs/$daemon.log"){
open (DFH,"tail -n25 $perlvar{'lonDaemons'}/logs/$daemon.log|");
while (my $line=<DFH>) {
&log($fh,"$line");
if ($line=~/INFO/) { $notices++; }
if ($line=~/WARNING/) { $notices++; }
if ($line=~/CRITICAL/) { $warnings++; }
};
close (DFH);
}
&log($fh,"</tt></p>");
my $pidfile="$perlvar{'lonDaemons'}/logs/$daemon.pid";
my $restartflag=1;
my $daemonpid;
if (-e $pidfile) {
my $lfh=IO::File->new("$pidfile");
$daemonpid=<$lfh>;
chomp($daemonpid);
if ($daemonpid =~ /^\d+$/ && kill 0 => $daemonpid) {
&log($fh,"<h3>$daemon at pid $daemonpid responding");
if ($send) { &log($fh,", sending $send"); }
&log($fh,"</h3>");
if ($send eq 'USR1') { kill USR1 => $daemonpid; }
if ($send eq 'USR2') { kill USR2 => $daemonpid; }
$restartflag=0;
if ($send eq 'USR2') {
$result = 'reloaded';
print "reloaded\n";
} else {
$result = 'running';
print "running\n";
}
} else {
$errors++;
&log($fh,"<h3>$daemon at pid $daemonpid not responding</h3>");
$restartflag=1;
&log($fh,"<h3>Decided to clean up stale .pid file and restart $daemon</h3>");
}
}
if ($restartflag==1) {
$simplestatus{$daemon}='off';
$errors++;
my $kadaemon=$daemon;
if ($kadaemon eq 'lonmemcached') { $kadaemon='memcached'; }
&log($fh,'<br><font color="red">Killall '.$daemon.': '.
`killall $kadaemon 2>&1`.' - ');
sleep 1;
&log($fh,unlink($pidfile).' - '.
`killall -9 $kadaemon 2>&1`.
'</font><br>');
&log($fh,"<h3>$daemon not running, trying to start</h3>");
if (&start_daemon($fh,$daemon,$pidfile,$args)) {
&log($fh,"<h3>$daemon at pid $daemonpid responding</h3>");
$simplestatus{$daemon}='restarted';
$result = 'started';
print "started\n";
} else {
$errors++;
&log($fh,"<h3>$daemon at pid $daemonpid not responding</h3>");
&log($fh,"<p>Give it one more try ...</p>");
print " ";
if (&start_daemon($fh,$daemon,$pidfile,$args)) {
&log($fh,"<h3>$daemon at pid $daemonpid responding</h3>");
$simplestatus{$daemon}='restarted';
$result = 'started';
print "started\n";
} else {
$result = 'failed';
print " failed\n";
$simplestatus{$daemon}='failed';
$errors++; $errors++;
&log($fh,"<h3>$daemon at pid $daemonpid not responding</h3>");
&log($fh,"<p>Unable to start $daemon</p>");
}
}
if (-e "$perlvar{'lonDaemons'}/logs/$daemon.log"){
&log($fh,"<p><pre>");
open (DFH,"tail -n100 $perlvar{'lonDaemons'}/logs/$daemon.log|");
while (my $line=<DFH>) {
&log($fh,"$line");
if ($line=~/WARNING/) { $notices++; }
if ($line=~/CRITICAL/) { $notices++; }
};
close (DFH);
&log($fh,"</pre></p>");
}
}
my $fname="$perlvar{'lonDaemons'}/logs/$daemon.log";
my ($dev,$ino,$mode,$nlink,
$uid,$gid,$rdev,$size,
$atime,$mtime,$ctime,
$blksize,$blocks)=stat($fname);
if ($size>$maxsize) {
&log($fh,"<p>Rotating logs ...</p>");
rename("$fname.2","$fname.3");
rename("$fname.1","$fname.2");
rename("$fname","$fname.1");
}
&errout($fh);
return $result;
}
# --------------------------------------------------------------------- Machine
sub log_machine_info {
my ($fh)=@_;
&log($fh,'<hr /><a name="machine" /><h2>Machine Information</h2>');
&log($fh,"<h3>loadavg</h3>");
open (LOADAVGH,"/proc/loadavg");
my $loadavg=<LOADAVGH>;
close (LOADAVGH);
&log($fh,"<tt>$loadavg</tt>");
my @parts=split(/\s+/,$loadavg);
if ($parts[1]>4.0) {
$errors++;
} elsif ($parts[1]>2.0) {
$warnings++;
} elsif ($parts[1]>1.0) {
$notices++;
}
&log($fh,"<h3>df</h3>");
&log($fh,"<pre>");
open (DFH,"df|");
while (my $line=<DFH>) {
&log($fh,&encode_entities($line,'<>&"'));
@parts=split(/\s+/,$line);
my $usage=$parts[4];
$usage=~s/\W//g;
if ($usage>90) {
$warnings++;
$notices++;
} elsif ($usage>80) {
$warnings++;
} elsif ($usage>60) {
$notices++;
}
if ($usage>95) { $warnings++; $warnings++; $simplestatus{'diskfull'}++; }
}
close (DFH);
&log($fh,"</pre>");
&log($fh,"<h3>ps</h3>");
&log($fh,"<pre>");
my $psproc=0;
open (PSH,"ps aux --cols 140 |");
while (my $line=<PSH>) {
&log($fh,&encode_entities($line,'<>&"'));
$psproc++;
}
close (PSH);
&log($fh,"</pre>");
if ($psproc>200) { $notices++; }
if ($psproc>250) { $notices++; }
&log($fh,"<h3>distprobe</h3>");
&log($fh,"<pre>");
open(DSH,"$perlvar{'lonDaemons'}/distprobe |");
while (my $line=<DSH>) {
&log($fh,&encode_entities($line,'<>&"'));
$psproc++;
}
close(DSH);
&log($fh,"</pre>");
&errout($fh);
}
sub start_logging {
my ($hostdom,$hostrole,$hostname,$spareid)=@_;
my $fh=IO::File->new(">$statusdir/newstatus.html");
my %simplestatus=();
my $now=time;
my $date=localtime($now);
&log($fh,(<<ENDHEADERS));
<html>
<head>
<title>LON Status Report $perlvar{'lonHostID'}</title>
</head>
<body bgcolor="#AAAAAA">
<a name="top" />
<h1>LON Status Report $perlvar{'lonHostID'}</h1>
<h2>$date ($now)</h2>
<ol>
<li><a href="#configuration">Configuration</a></li>
<li><a href="#machine">Machine Information</a></li>
<li><a href="#tmp">Temporary Files</a></li>
<li><a href="#tokens">Session Tokens</a></li>
<li><a href="#httpd">httpd</a></li>
<li><a href="#lonsql">lonsql</a></li>
<li><a href="#lond">lond</a></li>
<li><a href="#lonc">lonc</a></li>
<li><a href="#lonhttpd">lonhttpd</a></li>
<li><a href="#lonnet">lonnet</a></li>
<li><a href="#connections">Connections</a></li>
<li><a href="#delayed">Delayed Messages</a></li>
<li><a href="#errcount">Error Count</a></li>
</ol>
<hr />
<a name="configuration" />
<h2>Configuration</h2>
<h3>PerlVars</h3>
<table border="2">
ENDHEADERS
foreach my $varname (sort(keys(%perlvar))) {
&log($fh,"<tr><td>$varname</td><td>".
&encode_entities($perlvar{$varname},'<>&"')."</td></tr>\n");
}
&log($fh,"</table><h3>Hosts</h3><table border='2'>");
foreach my $id (sort(keys(%{$hostname}))) {
&log($fh,
"<tr><td>$id</td><td>".$hostdom->{$id}.
"</td><td>".$hostrole->{$id}.
"</td><td>".$hostname->{$id}."</td></tr>\n");
}
&log($fh,"</table><h3>Spare Hosts</h3><ol>");
foreach my $id (sort(keys(%{$spareid}))) {
&log($fh,"<li>$id\n</li>");
}
&log($fh,"</ol>\n");
return $fh;
}
# --------------------------------------------------------------- clean out tmp
sub clean_tmp {
my ($fh)=@_;
&log($fh,'<hr /><a name="tmp" /><h2>Temporary Files</h2>');
my $cleaned=0;
my $old=0;
while (my $fname=<$perlvar{'lonDaemons'}/tmp/*>) {
my ($dev,$ino,$mode,$nlink,
$uid,$gid,$rdev,$size,
$atime,$mtime,$ctime,
$blksize,$blocks)=stat($fname);
my $now=time;
my $since=$now-$mtime;
if ($since>$perlvar{'lonExpire'}) {
my $line='';
if (open(PROBE,$fname)) {
$line=<PROBE>;
close(PROBE);
}
unless ($line=~/^CHECKOUTTOKEN\&/) {
$cleaned++;
unlink("$fname");
} else {
if ($since>365*$perlvar{'lonExpire'}) {
$cleaned++;
unlink("$fname");
} else { $old++; }
}
}
}
&log($fh,"Cleaned up ".$cleaned." files (".$old." old checkout tokens).");
}
# ------------------------------------------------------------ clean out lonIDs
sub clean_lonIDs {
my ($fh)=@_;
&log($fh,'<hr /><a name="tokens" /><h2>Session Tokens</h2>');
my $cleaned=0;
my $active=0;
while (my $fname=<$perlvar{'lonIDsDir'}/*>) {
my ($dev,$ino,$mode,$nlink,
$uid,$gid,$rdev,$size,
$atime,$mtime,$ctime,
$blksize,$blocks)=stat($fname);
my $now=time;
my $since=$now-$mtime;
if ($since>$perlvar{'lonExpire'}) {
$cleaned++;
&log($fh,"Unlinking $fname<br>");
unlink("$fname");
} else {
$active++;
}
}
&log($fh,"<p>Cleaned up ".$cleaned." stale session token(s).</p>");
&log($fh,"<h3>$active open session(s)</h3>");
}
# ----------------------------------------------------------------------- httpd
sub check_httpd_logs {
my ($fh)=@_;
&log($fh,'<hr /><a name="httpd" /><h2>httpd</h2><h3>Access Log</h3><pre>');
open (DFH,"tail -n25 /etc/httpd/logs/access_log|");
while (my $line=<DFH>) { &log($fh,&encode_entities($line,'<>&"')) };
close (DFH);
&log($fh,"</pre><h3>Error Log</h3><pre>");
open (DFH,"tail -n25 /etc/httpd/logs/error_log|");
while (my $line=<DFH>) {
&log($fh,"$line");
if ($line=~/\[error\]/) { $notices++; }
}
close (DFH);
&log($fh,"</pre>");
&errout($fh);
}
# ---------------------------------------------------------------------- lonnet
sub rotate_lonnet_logs {
my ($fh)=@_;
&log($fh,'<hr /><a name="lonnet" /><h2>lonnet</h2><h3>Temp Log</h3><pre>');
print "checking logs\n";
if (-e "$perlvar{'lonDaemons'}/logs/lonnet.log"){
open (DFH,"tail -n50 $perlvar{'lonDaemons'}/logs/lonnet.log|");
while (my $line=<DFH>) {
&log($fh,&encode_entities($line,'<>&"'));
}
close (DFH);
}
&log($fh,"</pre><h3>Perm Log</h3><pre>");
if (-e "$perlvar{'lonDaemons'}/logs/lonnet.perm.log") {
open(DFH,"tail -n10 $perlvar{'lonDaemons'}/logs/lonnet.perm.log|");
while (my $line=<DFH>) {
&log($fh,&encode_entities($line,'<>&"'));
}
close (DFH);
} else { &log($fh,"No perm log\n") }
my $fname="$perlvar{'lonDaemons'}/logs/lonnet.log";
my ($dev,$ino,$mode,$nlink,
$uid,$gid,$rdev,$size,
$atime,$mtime,$ctime,
$blksize,$blocks)=stat($fname);
if ($size>40000) {
&log($fh,"<p>Rotating logs ...</p>");
rename("$fname.2","$fname.3");
rename("$fname.1","$fname.2");
rename("$fname","$fname.1");
}
&log($fh,"</pre>");
&errout($fh);
}
# ----------------------------------------------------------------- Connections
sub test_connections {
my ($fh,$hostname)=@_;
&log($fh,'<hr /><a name="connections" /><h2>Connections</h2>');
print "testing connections\n";
&log($fh,"<table border='2'>");
my ($good,$bad)=(0,0);
foreach my $tryserver (sort(keys(%{$hostname}))) {
print(".");
my $result;
my $answer=reply("ping",$tryserver,$hostname);
if ($answer eq "$tryserver:$perlvar{'lonHostID'}") {
$result="<b>ok</b>";
$good++;
} else {
$result=$answer;
$warnings++;
if ($answer eq 'con_lost') {
$bad++;
$warnings++;
} else {
$good++; #self connection
}
}
if ($answer =~ /con_lost/) { print(" $tryserver down\n"); }
&log($fh,"<tr><td>$tryserver</td><td>$result</td></tr>\n");
}
&log($fh,"</table>");
print "\n$good good, $bad bad connections\n";
&errout($fh);
}
# ------------------------------------------------------------ Delayed messages
sub check_delayed_msg {
my ($fh)=@_;
&log($fh,'<hr /><a name="delayed" /><h2>Delayed Messages</h2>');
print "checking buffers\n";
&log($fh,'<h3>Scanning Permanent Log</h3>');
my $unsend=0;
my $dfh=IO::File->new("$perlvar{'lonDaemons'}/logs/lonnet.perm.log");
while (my $line=<$dfh>) {
my ($time,$sdf,$dserv,$dcmd)=split(/:/,$line);
if ($sdf eq 'F') {
my $local=localtime($time);
&log($fh,"<b>Failed: $time, $dserv, $dcmd</b><br>");
$warnings++;
}
if ($sdf eq 'S') { $unsend--; }
if ($sdf eq 'D') { $unsend++; }
}
&log($fh,"<p>Total unsend messages: <b>$unsend</b></p>\n");
$warnings=$warnings+5*$unsend;
if ($unsend) { $simplestatus{'unsend'}=$unsend; }
&log($fh,"<h3>Outgoing Buffer</h3>\n<pre>");
open (DFH,"ls -lF $perlvar{'lonSockDir'}/delayed|");
while (my $line=<DFH>) {
&log($fh,&encode_entities($line,'<>&"'));
}
&log($fh,"</pre>\n");
close (DFH);
}
sub finish_logging {
my ($fh)=@_;
&log($fh,"<a name='errcount' />\n");
$totalcount=$notices+4*$warnings+100*$errors;
&errout($fh);
&log($fh,"<h1>Total Error Count: $totalcount</h1>");
my $now=time;
my $date=localtime($now);
&log($fh,"<hr />$date ($now)</body></html>\n");
print "lon-status webpage updated\n";
$fh->close();
if ($errors) { $simplestatus{'errors'}=$errors; }
if ($warnings) { $simplestatus{'warnings'}=$warnings; }
if ($notices) { $simplestatus{'notices'}=$notices; }
$simplestatus{'time'}=time;
}
sub log_simplestatus {
rename ("$statusdir/newstatus.html","$statusdir/index.html");
my $sfh=IO::File->new(">$statusdir/loncron_simple.txt");
foreach (keys %simplestatus) {
print $sfh $_.'='.$simplestatus{$_}.'&';
}
print $sfh "\n";
$sfh->close();
}
sub send_mail {
print "sending mail\n";
my $emailto="$perlvar{'lonAdmEMail'}";
if ($totalcount>2500) {
$emailto.=",$perlvar{'lonSysEMail'}";
}
my $subj="LON: $perlvar{'lonHostID'} E:$errors W:$warnings N:$notices";
my $result=system("metasend -b -S 4000000 -t $emailto -s '$subj' -f $statusdir/index.html -m text/html >& /dev/null");
if ($result != 0) {
$result=system("mail -s '$subj' $emailto < $statusdir/index.html");
}
}
sub usage {
print(<<USAGE);
loncron - housekeeping program that checks up on various parts of Lon-CAPA
Options:
--help Display help
--oldlonc When starting the lonc daemon use 'lonc' not 'loncnew'
--noemail Do not send the status email
--justcheckconnections Only check the current status of the lonc/d
connections, do not send emails do not
check if the daemons are running, do not
generate lon-status
--justcheckdaemons Only check that all of the Lon-CAPA daemons are
running, do not send emails do not
check the lonc/d connections, do not
generate lon-status
--justreload Only tell the daemons to reload the config files,
do not send emails do not
check if the daemons are running, do not
generate lon-status
USAGE
}
# ================================================================ Main Program
sub main () {
my ($oldlonc,$help,$justcheckdaemons,$noemail,$justcheckconnections,
$justreload);
&GetOptions("help" => \$help,
"oldlonc" => \$oldlonc,
"justcheckdaemons" => \$justcheckdaemons,
"noemail" => \$noemail,
"justcheckconnections" => \$justcheckconnections,
"justreload" => \$justreload
);
if ($help) { &usage(); return; }
# --------------------------------- Read loncapa_apache.conf and loncapa.conf
my $perlvarref=LONCAPA::Configuration::read_conf('loncapa.conf');
%perlvar=%{$perlvarref};
undef $perlvarref;
delete $perlvar{'lonReceipt'}; # remove since sensitive and not needed
delete $perlvar{'lonSqlAccess'}; # remove since sensitive and not needed
# --------------------------------------- Make sure that LON-CAPA is configured
# I only test for one thing here (lonHostID). This is just a safeguard.
if ('{[[[[lonHostID]]]]}' eq $perlvar{'lonHostID'}) {
print("Unconfigured machine.\n");
my $emailto=$perlvar{'lonSysEMail'};
my $hostname=`/bin/hostname`;
chop $hostname;
$hostname=~s/[^\w\.]//g; # make sure is safe to pass through shell
my $subj="LON: Unconfigured machine $hostname";
system("echo 'Unconfigured machine $hostname.' |\
mailto $emailto -s '$subj' > /dev/null");
exit 1;
}
# ----------------------------- Make sure this process is running from user=www
my $wwwid=getpwnam('www');
if ($wwwid!=$<) {
print("User ID mismatch. This program must be run as user 'www'\n");
my $emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";
my $subj="LON: $perlvar{'lonHostID'} User ID mismatch";
system("echo 'User ID mismatch. loncron must be run as user www.' |\
mailto $emailto -s '$subj' > /dev/null");
exit 1;
}
# ------------------------------------------------------------- Read hosts file
my $config=IO::File->new("$perlvar{'lonTabDir'}/hosts.tab");
my (%hostname,%hostdom,%hostrole,%spareid);
while (my $configline=<$config>) {
next if ($configline =~ /^(\#|\s*\$)/);
my ($id,$domain,$role,$name)=split(/:/,$configline);
if ($id && $domain && $role && $name) {
$name=~s/\s//g;
$hostname{$id}=$name;
$hostdom{$id}=$domain;
$hostrole{$id}=$role;
}
}
undef $config;
# ------------------------------------------------------ Read spare server file
$config=IO::File->new("$perlvar{'lonTabDir'}/spare.tab");
while (my $configline=<$config>) {
chomp($configline);
if (($configline) && ($configline ne $perlvar{'lonHostID'})) {
$spareid{$configline}=1;
}
}
undef $config;
# ---------------------------------------------------------------- Start report
$errors=0;
$warnings=0;
$notices=0;
my $fh;
if (!$justcheckdaemons && !$justcheckconnections && !$justreload) {
$fh=&start_logging(\%hostdom,\%hostrole,\%hostname,\%spareid);
&log_machine_info($fh);
&clean_tmp($fh);
&clean_lonIDs($fh);
&check_httpd_logs($fh);
&rotate_lonnet_logs($fh);
}
if (!$justcheckconnections && !$justreload) {
&checkon_daemon($fh,'lonsql',200000);
if ( &checkon_daemon($fh,'lond',40000,'USR1') eq 'running') {
&checkon_daemon($fh,'lond',40000,'USR2');
}
my $args='new';
if ($oldlonc) { $args = ''; }
&checkon_daemon($fh,'lonc',40000,'USR2',$args);
&checkon_daemon($fh,'lonhttpd',40000);
&checkon_daemon($fh,'lonmemcached',40000);
}
if ($justreload) {
&checkon_daemon($fh,'lond',40000,'USR2');
my $args='new';
if ($oldlonc) { $args = ''; }
&checkon_daemon($fh,'lonc',40000,'USR2',$args);
}
if ($justcheckconnections) {
&test_connections($fh,\%hostname);
}
if (!$justcheckdaemons && !$justcheckconnections && !$justreload) {
&check_delayed_msg($fh);
&finish_logging($fh);
&log_simplestatus();
if ($totalcount>200 && !$noemail) { &send_mail(); }
}
}
&main();
1;
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