Comments on: Xen VMs performance collection

By: Mark Ruys

Mark Ruys — Wed, 24 Feb 2010 12:20:16 +0000

> With Xen 3.1 ‘/usr/sbin/xentop -b -i 2 -d.1′ – always returns Domain-0 CPU usage about 100%.
> And it should be full path to xentop since not all crontab jobs have right environment set.

Change “-d.1″ to “-d 1″. Apparently, some xentop implementations only accept seconds, not tenths of seconds.

By: ez-aton

ez-aton — Tue, 15 Dec 2009 14:24:57 +0000

This script is meant for Xen Community, and was tested on Centos5 versions. I did not try to adjust it to run on XS just yet.
Sorry.

By: AndreaConsadori

AndreaConsadori — Tue, 15 Dec 2009 09:18:03 +0000

Hi, i try this script on xen express 5.5 but i’ve this error

Operator or semicolon missing before & at ./xen-stat.pl line 14.
Ambiguous use of & resolved as operator & at ./xen-stat.pl line 14.
Useless use of not in void context at ./xen-stat.pl line 14.
Bareword “amp” not allowed while “strict subs” in use at ./xen-stat.pl line 14.
Execution of ./xen-stat.pl aborted due to compilation errors.

how can i fix it?

By: Mark Ruys

Mark Ruys — Wed, 11 Nov 2009 22:11:54 +0000

If you get errors like:

NET-SNMP-EXTEND-MIB::nsExtendOutputFull.”xen-stats” = STRING: /bin/cat: /var/run/xen-stats: Permission denied

it might be that SELinux is blocking access. I created this policy using audit2allow:

module snmpd 1.0;

require {
type var_run_t;
type snmpd_t;
class file { read getattr };
}

#============= snmpd_t ==============
allow snmpd_t var_run_t:file { read getattr };

compile & load it, and snmpd is able to read the xen-stats file.

By: rupertt

rupertt — Mon, 26 Oct 2009 14:42:33 +0000

Hi,

im having trouble getting things to work together.
I could import the scripts into cacti and copied the 2 scripts into the cactio folders,
than i used your script on the dom0, and can snmpwalk onto that machine:

# snmpwalk -v2c -c public 172.17.4.101 NET-SNMP-EXTEND-MIB::nsExtendOutputFull.\”xen-stats\”
NET-SNMP-EXTEND-MIB::nsExtendOutputFull.”xen-stats” = STRING: name: Domain-0, cpu_sec: 1563511, cpu_percent: 97.10, vbd_rd: 0, vbd_wr: 0
name: monitoring-2, cpu_sec: 3833949, cpu_percent: 194.00, vbd_rd: 14746, vbd_wr: 20419
name: uat-vm2, cpu_sec: 154919, cpu_percent: 0.00, vbd_rd: 25191, vbd_wr: 88203
name: uat-vm4, cpu_sec: 94536, cpu_percent: 0.00, vbd_rd: 16, vbd_wr: 4
name: vpn-vm2, cpu_sec: 110325, cpu_percent: 0.00, vbd_rd: 21, vbd_wr: 1

But within cacti no graphs will be selectable when I try to create some,
this is the output of the verbose query:

+ Running data query [19].
+ Found type = ‘4 ‘[script query].
+ Found data query XML file at ‘/var/www/cacti/resource/script_queries/xen_cloud_stats.xml’
+ XML file parsed ok.
+ Executing script for list of indexes ‘/usr/bin/php /var/www/cacti/scripts/xen_cloud_stats.php index’
+ Executing script query ‘/usr/bin/php /var/www/cacti/scripts/xen_cloud_stats.php query xen_name’
+ Found item [xen_name=''] index:
+ Found data query XML file at ‘/var/www/cacti/resource/script_queries/xen_cloud_stats.xml’
+ Found data query XML file at ‘/var/www/cacti/resource/script_queries/xen_cloud_stats.xml’
+ Found data query XML file at ‘/var/www/cacti/resource/script_queries/xen_cloud_stats.xml’

Do i miss anything?

greetings

By: ez-aton

ez-aton — Mon, 10 Aug 2009 05:12:21 +0000

I use 0.8.7c
Weird…

By: Roland

Roland — Tue, 04 Aug 2009 16:02:24 +0000

I’m getting this error:
Error: XML: Hash version does not exist.
I think this is because you exported template with different version of cacti. Could you let me know which version you used?

By: ez-aton

ez-aton — Mon, 29 Jun 2009 12:56:30 +0000

Thanks for letting me know.
There was a minor problem with the server which caused its backend DB to fail. It was fixed, and should not operate correctly. I have tested it to work.
Let me know if it doesn’t, please.

Thanks
Ez

By: Yann

Yann — Mon, 29 Jun 2009 08:05:34 +0000

Hi,

Nice job, but sadly the link to xen_cloud.tar.gz seems broken : “Error establishing a database connection”

Cheers,

By: ez-aton

ez-aton — Wed, 06 May 2009 00:00:31 +0000

Thanks for your comment.
With Cacti, I tend to sample dom0 from other aspects, and not through this specific command. However, thanks for the info!