Re: howto virtual/real server monitoring

Hi

i use the script attach for checks the status of a vip. This script is run
by nagios-nrpe-server
with conf :

command[check_load_balancing_arg]=/usr/lib/nagios/plugins/
check_keepalived_arg.pl /etc/keepalived/keepalived.conf "$ARG1$:$ARG2$"
$ARG3$
command[check_load_balancing_ipv6_arg]=/usr/lib/nagios/plugins/
check_keepalived_arg.pl /etc/keepalived/keepalived.conf "[$ARG1$]:$ARG2$"
$ARG3$

The first arg is the ip, the second the port the third the protocol ("udp"
or "tcp" )

The principe is to compare the output of ipvsadm command with the
keepalived configuration

the user use for run the script should run ipvsadm through sudo without
password.
for exemple :
nagios          ALL = (root) NOPASSWD:  /sbin/ipvsadm


Hope, this can help

Regards,


Olivier




On Mon, Jan 19, 2015 at 8:57 PM, Tom van Leeuwen <
[email protected]> wrote:

> Hi list!
>
> I'm being spammed by keepalived when real servers stop working due to
> reboot or application restart and I was wondering if there are any tools
> around to manage this.
> It would be great if you could simply check the state of the virtual
> servers by checking how many backends are up and down.
>
> A thing that comes to mind is tailing the logfile to see what's
> happening...
> It would also be great if keepalived would have some "state" file that
> could be read to check the status of all virtual servers preferably in
> json format :-)
>
> Anyway... I'm wondering how you guys handle the monitoring of keepalived
> virtual/real servers.
>
> Kind regards,
> Tom van Leeuwen
>
>
> ------------------------------------------------------------------------------
> New Year. New Location. New Benefits. New Data Center in Ashburn, VA.
> GigeNET is offering a free month of service with a new server in Ashburn.
> Choose from 2 high performing configs, both with 100TB of bandwidth.
> Higher redundancy.Lower latency.Increased capacity.Completely compliant.
> http://p.sf.net/sfu/gigenet
> _______________________________________________
> Keepalived-devel mailing list
> [email protected]
> https://lists.sourceforge.net/lists/listinfo/keepalived-devel
>

------------------------------------------------------------------------------
New Year. New Location. New Benefits. New Data Center in Ashburn, VA.
GigeNET is offering a free month of service with a new server in Ashburn.
Choose from 2 high performing configs, both with 100TB of bandwidth.
Higher redundancy.Lower latency.Increased capacity.Completely compliant.
http://p.sf.net/sfu/gigenet

_______________________________________________
Keepalived-devel mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/keepalived-devel

#!/usr/bin/perl -w
# $Id: check_keepalived_arg.pl,v 1.1 2014/01/20 15:02:41 cvs Exp $


use strict;

my $status = 0;
my $output = 0;
my $compteur = 0;
my @result;
my @retgrep;
my $tab;
my $type = "";
my $vip = "";
my $vip_check_ipvsadm = "";
my $keepalived_conf;
my @list;
my $liste_reel_down;
my $vip_ip;
my $vip_port;
my $compteur_reel_down;
my $ind_ipv6 = 0;


if (scalar(@ARGV) != 3) {
   $status = 2;
   $output = "KO - usage \"fichier_keepalived\" \"vip\" \"type\"\n";
   Error();
}
$type = $ARGV[2];
$vip = $ARGV[1];
$vip_check_ipvsadm = $vip;
$keepalived_conf = $ARGV[0];
my $encours = 0;
if (!($vip =~ /^([^\s]*):(\d*)$/)) {
   $status = 2;
   $output = "KO - format vip (argument 1)  $vip invalide\n";
   Error();
}
$vip_ip = $1;
$vip_port = $2;
if ($vip_ip =~ /^\[(.*)\]$/) {
  $ind_ipv6 = 1;
  $vip_ip = $1;
  $vip_check_ipvsadm = "\Q$vip\E";
}
if (!(open(KEEPALIVED,$keepalived_conf))) {
   $status = 2;
   $output = "ouverture conf keepalived $keepalived_conf impossible\n";
   Error();
} 
while (<KEEPALIVED>) {
  if ($encours == 1) {
      if ($_ =~ /virtual_server/) {
         $encours = 0;
      }
      if ($_ =~ /real_server\s*([^\s]*)\s*(\d*)/) {
          if ($ind_ipv6 == 1) {
            push(@list,"[$1]:$2");
          }
          else {
            push(@list,"$1:$2");
          }
      }
  }
  if ($_ =~ /virtual_server\s*$vip_ip\s*$vip_port/) {
         $encours = 1;
  }

}
close(KEEPALIVED);

if ($type eq "udp") { 
  @result = `sudo /sbin/ipvsadm -Ln -u $vip`;
}
elsif  ($type eq "tcp") {
  @result = `sudo ipvsadm -Ln -t $vip`;
}
else {
  $status = 2;
  $output = "KO - type non supporte $type";
  Error();
}


@retgrep = grep(/$vip_check_ipvsadm/,@result);
if (scalar(@retgrep) < 1) {
  $status = 2;
  $output = "KO - virtuelle absente";
  Error();
}

foreach $tab (@list) {
    @retgrep = grep(/\Q$tab\E/,@result);
    if (scalar(@retgrep) < 1) {
      $status = 2;
      $liste_reel_down .= "$tab ";
      $compteur_reel_down += 1;
    }
    $compteur += 1;
}

if ($status != 0) {
  $output =  "KO - " . $compteur_reel_down . " serveur reel down sur " . (scalar(@list)) .  " $liste_reel_down";
  Error();
}
else {
  $status = 0;
  $output = "OK";
  print "$output";
}


sub Error {
  print "$output";
  exit $status;
}