Host counter

[Jocelyn]

Hi,
I would like zabbix to build a graph on which I could see the number of hosts up (considering a host as up if the server can ping it correctly) at a time t.
Is it possible to do this? Could you help me or explain me how to do this. I'm beginner on zabbix.
Thanks in advance.

[Alexei]

This can be done using aggregate item type. Please look at the Zabbix Manual for details.

[Jocelyn]

I see.
I tried to create an item of aggregate type with a function like that :
grpsum["all","icmpping","last","0"]
I'm doing icmpping on my hosts in an item called pingcheck and it works
but aggregate item doesn't store value and I'm not sure it's what I want it to do. Is there one more step?
I'm now looking at the User parameter example of the manual :
UserParameter=ping,echo 1
"The agent will always return '1' for item with key ping" I don't understand what it means. Does it mean : if a host of the hostgrp chosen in the key grpfunc can be pingged, it returns 1?

[rue]

I see.
I tried to create an item of aggregate type with a function like that :
grpsum["all","icmpping","last","0"]
I'm doing icmpping on my hosts in an item called pingcheck and it works
but aggregate item doesn't store value and I'm not sure it's what I want it to do. Is there one more step?
I'm now looking at the User parameter example of the manual :
UserParameter=ping,echo 1
"The agent will always return '1' for item with key ping" I don't understand what it means. Does it mean : if a host of the hostgrp chosen in the key grpfunc can be pingged, it returns 1?

No. A UserParameter is defined which, when referenced in an item as key "ping", will always return "1".
Have a look at UserParameter documentation for further info:

User Parameter, (UserParameter) refers to custom scripts
defined in an agent’s configuration file. User parameters are
defined by a key and command. The key refers to the item
defined in the web interface and can be configured to accept
arguments as sent by the server.

(from 1.6 manual)

cheers

Rü

[Jocelyn]

ok
But does anyone have an issue to my problem?
I created the item of type aggregate the way I wrote before and it doesn't build data. I tried to put the item in the same template that I use for pinging my hosts (except zabbix server) but it's not what interest me. I would like to create a single graph using the item as Y. Why does my item doesn't work? Did I do something wrong?
If you need more information, don't hesitate asking me.
Thanks in advance.