Re: [OT] Server Monitoring

[zentara]

You have 2 monitoring options, one is a daemon which tests the existence of the server's process. Like intelli-monitor.pl.

Here is something I did a while back in a similar vein, maybe it will give you some ideas. Maybe a 2 pronged approach, a daemon and an lwp script to test if the apache is locked up, or overloaded.

#!/usr/bin/perl -w
#just run it. The first time it starts the daemon. If you try to start
+ it 
#a second time, it gives an error msg. Run it with any commandline arg
+ument, 
# like "k" will kill all instances of the script 

use strict;
use IO::Handle;
use Proc::ProcessTable;
use Proc::Daemon;

my $t1 = new Proc::ProcessTable;
my @pids;
my $pid;
foreach my $p (@{$t1->table}){
   if($p->cmndline =~ /apache-monitor/){
        $pid = $p->pid;
        #print "$pid\n"; 
        push(@pids,$pid); #unless $pid == $$; 

   }
}
################################################### 
if (exists $ARGV[0]) { foreach $pid (@pids){
                        print "killing pid $pid\n";
                        kill 9,$pid;
                }
}

#################################################### 
if ($#pids > 0) {
  print "@pids  already running!\n";
  exit;
}
#################################################### 

Proc::Daemon::Init;
#open(LOG,">>/var/log/apache-monitor.log") or die $!; #when run as roo
+t 
open(LOG,">>/tmp/apache-monitor.log") or die $!; #for testing 

while (1){
my $ok =0;
my $t = new Proc::ProcessTable;
foreach my $p (@{$t->table}){
   if($p->cmndline =~ /\/usr\/sbin\/httpd/){
      print LOG time(),' ',$p->cmndline," already running!\n";
      $ok=1;last;
   }
}
if ($ok == 0) {print LOG time(),' ',"failed!\n";}
LOG->flush;
sleep(15);
}