Hi list,
I am trying out Nagios v3. I followed the documentation and it was easy
getting the system up and running.
Now that the base system is working as expected, I am trying to improve the
configuration to avoid duplication of information using templates and clean up
the configuration. So, I would like your feedback/suggestions on my approach.
Let me explain the scenario. I have multiple hosts that can run a
combination of applications. Each application can have one or more services
associated with it.
My idea is as follows:
1. Each application is mapped to a service group template (APP_xyz_SVC_GRP. The
services in that application are associated with that application service group.
define servicegroup {
servicegroup_name APP_xyz_SVC_GRP
register 0
}
define service {
name SSH
use generic-service
servicegroups APP_xyz_SVC_GRP
service_description SSH
check_command check_ssh
register 0
}
These application level templates do not change often.
2. Each host has a service group associated with it that is based on the actual
applications installed on that host. The host.cfg for that host looks like
define host {
use linux-server
host_name HOST_abc
address 10.10.10.10
hostgroups HOSTGROUP_123
}
define servicegroup {
servicegroup_name HOST_abc_SVCS
servicegroup_members APP_xyz_SVC_GRP, APP_aaa_SVC_GRP, APP_bbb_SVC_GRP
}
The list of hosts and applications are dynamic and can change over time.
1. The first problem I see is that the host.cfg requires the actual service
definition - I cannot use the template service SSH directly. So, for each
application service, I need to add the following lines to my host.cfg
define service {
use SSH
host_name HOST_abc
servicegroups HOST_abc_SVCS
}
Is there a solution that can avoid the above service redefinition?
2. servicegroup definition does not include a host_name or similar directive -
that would have simplified adding all services in the servicegroup to a host.
Is there a way to achieve this - this will resolve problem #1 above. Basically
auto-instantiate (or register) the template services in a group with associated
host.
Note that both the hosts and applications running on the hosts are dynamic. The
applications are fixed - they are part of a limited set. The eventual end goal
is to auto-generate the nagios configuration. For this, I need the basic
building blocks in place.
In case someone has encountered this problem before and has a better
solution/design, please let me know.
Thanks,
Mahesh
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