How to compare strings?

[g.vecchi]

Hi all!
I would like to set up an item with vfs.file.md5sum[] key but I'm in trouble how to create trigger which compare last and last-1 value.

Any ideas?

Thanks!!!

[Rudd]

Check the triggers in the default Linux template. There are various triggers around changed checksums:

{Template_CentOS_Linux_Base:vfs.file.cksum[/etc/passwd].diff(0)}>0

hth

[g.vecchi]

The trigger in Linux Template uses cksum function, NOT md5sum.
The result value from the two item key is different; number for cksum and character for md5sum.

Any ideas?

[Rudd]

Sorry, I probably picked a bad example. You want to create an alert when the md5sum of a file changes?

The relevant part of the trigger is ".diff(0)}>0" where it compares the new string value against the previous one.

The following works for me:

{Template_http:vfs.file.md5sum[/var/apache2/www/index.html].diff(0)}>0

[g.vecchi]

I've tried both ".diff(0)}>0" and "#0" but noone works.
I'm using Zabbix 1.8.1

[Rudd]

Can you provide the full Description and Key as they appear in the items of the host, as well as full Name and Expression as they appear in the triggers of that host?

[g.vecchi]

[solved]

I'm really sorry guys, it works great!
I forgot to set trigger severity, so Zabbix didn't notify me.

It's all OK.

The item key is:

vfs.file.md5sum[/var/www/index.html]

and the trigger key is:

{server001:vfs.file.md5sum[/var/www/index.html].diff(0)}#0

Thanks to all!
Bye

[Rudd]

Sweet, thanks for providing the solution.