CPU reporting of F5 devices

Hi Claret,

 

 

Citizen_elah has done some very helpful work in this area with Perl / Cacti. Here is a post where he added an example of using SNMP to track CPU usage:

 

 

cpu monitoring

 

http://devcentral.f5.com/Default.aspx?tabid=53&forumid=32&tpage=1&view=topic&postid=1623716242

 

 

Aaron

Pre-v.10, you have to do all manual calculations. New in v10 is a ratio oid for 5 second, 1 minute, & 5 minute cpu usage, per processor and globally. These are:

 

(indexed, there is a value for each processor present)

 

sysMultiHostCpuUsageRatio5s

 

sysMultiHostCpuUsageRatio1m

 

sysMultiHostCpuUsageRatio5m

 

(singular value)

 

sysGlobalHostCpuUsageRatio5s

 

sysGlobalHostCpuUsageRatio1m

 

sysGlobalHostCpuUsageRatio5m

 

I'll have a tech tip up later this week complete with a cacti template for multi-processor systems, but here's the perl script for displaying CPU goodies to the console (you'll need the Net-SNMP perl module)

 

   
 !/usr/bin/perl -w   
  This code is not supported by F5 Network and is offered under the GNU General Public License.  Use at your own risk.   
 use strict;   
 use Net::SNMP qw(:snmp);   
 my ($host, $snmp_comm);   
 $host = $ARGV[0];   
 $snmp_comm = $ARGV[1];   
 chomp ($host , $snmp_comm);   
 my $cpuID        = ".1.3.6.1.4.1.3375.2.1.7.5.2.1.3.1.48";   
 my $cpuIndex     = ".1.3.6.1.4.1.3375.2.1.7.5.2.1.2.1.48";   
 my $cpuUsageRatio5s = ".1.3.6.1.4.1.3375.2.1.7.5.2.1.19.1.48.";   
 my $cpuUsageRatio1m = ".1.3.6.1.4.1.3375.2.1.7.5.2.1.27.1.48.";   
 my $cpuUsageRatio5m = ".1.3.6.1.4.1.3375.2.1.7.5.2.1.35.1.48.";   
 my $gcpuUsageRatio5s = ".1.3.6.1.4.1.3375.2.1.1.2.20.21.0";   
 my $gcpuUsageRatio1m = ".1.3.6.1.4.1.3375.2.1.1.2.20.29.0";   
 my $gcpuUsageRatio5m = ".1.3.6.1.4.1.3375.2.1.1.2.20.37.0";   
 my ($session, $error) = Net::SNMP->session(   
 -hostname       => $host,   
 -community      => $snmp_comm,   
 -port           => 161,   
 -version        => 'snmpv2c',   
 -nonblocking    => 0   
 );   
 if (!defined $session) {   
 print "Received no SNMP response from $host\n";   
 print STDERR "Error: $error\n";   
 exit -1;   
 }   
 my $allCPU = $session->get_table ( -baseoid => $cpuIndex );   
 my %cpu_table = %{$allCPU};   
 my $x = 0;   
 print "\n\nCPU Utilization:\t5s\t1m\t5m\n\n";   
 foreach my $key (sort keys %cpu_table) {   
 my @oid_index = split(/\./, $key);   
 my $ltm_cpu5s = $cpuUsageRatio5s . $oid_index[-1];   
 my $ltm_cpu1m = $cpuUsageRatio1m . $oid_index[-1];   
 my $ltm_cpu5m = $cpuUsageRatio5m . $oid_index[-1];   
 my $oid_ratios = $session->get_request(   
 -varbindlist =>   
 [$ltm_cpu5s, $ltm_cpu1m, $ltm_cpu5m] );   
 print "\tCPU$x\t\t$oid_ratios->{$ltm_cpu5s}\t$oid_ratios->{$ltm_cpu1m}\t$oid_ratios->{$ltm_cpu5m}\n";   
 $x++;   
 }   
 my $oid_gratios = $session->get_request(   
 -varbindlist =>   
 [$gcpuUsageRatio5s, $gcpuUsageRatio1m, $gcpuUsageRatio5m] );   
 print "\tGlobal\t\t$oid_gratios->{$gcpuUsageRatio5s}\t$oid_gratios->{$gcpuUsageRatio1m}\t$oid_gratios->{$gcpuUsageRatio5m}\n\n\n";   
 

 

Output for my 3600:

 

  
 vadmin@vadmin:/tmp$ ./ltmcpu.pl 10.10.20.5 public   
 CPU Utilization:        5s      1m      5m   
         CPU0            3       3       3   
         CPU1            2       3       3   
         Global          2       3       3  
 

 

 

BTW, if these intervals (5s/1m/5s) don't work for you, you can still use the other oids and do the calculations manually, as you have to do for the TMM utilization as well. They are:

 

 

For CPUn:

 

 

sysMultiHostCpuUser

 

sysMultiHostCpuNice

 

sysMultiHostCpuSystem

 

sysMultiHostCpuIdle

 

sysMultiHostCpuIrq

 

sysMultiHostCpuSoftirq

 

sysMultiHostCpuIowait

 

 

For Global:

 

 

sysGlobalHostCpuUser

 

sysGlobalHostCpuNice

 

sysGlobalHostCpuSystem

 

sysGlobalHostCpuIdle

 

sysGlobalHostCpuIrq

 

sysGlobalHostCpuSoftirq

 

sysGlobalHostCpuIowait

 

 

Calculation for both CPUn & Global is:

 

 

((dUser + dNice + dSystem)/(dUser + dNice + dIdle + dSystem + dIrq + dSoftirq + dIowait))*100

 

 

For TMM:

 

 

sysStatTmTotalCycles

 

sysStatTmIdleCycles

 

sysStatTmSleepCycles

 

 

Calculation is:

 

 

((deltaTotal - (deltaIdle + deltaSleep)) / deltaTotal)*100

 

 

HTH...Jason