Hosts and Services

[Subhendu Ghosh]

The model for hosts and services exist separately such that if one of a 
number of services fails on a host, the host check command is used to 
verify if the host is up/down before checking all the other services.

Similarly if a host is down, parent hosts are checked to see if the path 
to host is down or just the target host. This is also done using the host 
check_command.

So while it might look redundant from a data model perespective - it 
actually is quite useful.

-sg

On Fri, 17 Jun 2005, craig cook wrote:

> I've been poking around the data model for nagios 2.x recently and from
> what I can see the “check_command” and related variables in the “define
> host{“ section are actually redundant...
>
>
> Should those variables be removed and let the “define service{” section
> handle “check_commands”?
>
>
> e.g.
>
> define host {
>
> host_name           linux-server
> address             10.0.0.1
> parents             linux-server2
> hostgroups          web-servers
> check_command       ping-linux-servers
> contact_group       linux-admins
> [snip]
> }
>
>
> should actually become something like
>
>
> define host {
> host_name      linux-server
> address        10.0.0.1
> parents        linux-server2
> hostgroups     web-servers
> }
>
>
> define service {
> service              ping-linux-servers
> check_command_line   ping ...
> }
>
>
> define host_service {
> host_name     linux-server
> service       ping-linux-servers
> contact_group linux-admins
> }
>
>
> (more of a relational way of thinking)
>
>
> For host “contact_groups” you do not actually get contacted when a host
> fails, it is actually a “service” that has executed and failed on that
> host. If the “host check_command” was removed, this would be a little
> clearer.
>
>
> Comments?
>
>
> (If this is as clear a mud I'll try and explain it a different way)
>
>
> Craig Cook
>
>
>
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