Nagios Support Forum

Posted: **Fri Apr 01, 2016 12:46 pm**

Posted a previous thread a while back about using the REST API (it's here if you're curious: https://support.nagios.com/forum/viewto ... 16&t=37510 )

Still trying to figure out a workaround to this - Here's my situation:

We currently have an AWS account where we spin up and burn down tens of VMs every day. Most of the new hosts need to be added to Nagios and most of the VMs burned down need to be removed from Nagios. Currently, the way we've been adding the hosts is to bulk host clone and import and removing them is a pain in the a$$ (delete the services, then delete the hosts).

So my thought was to generate a config file for every host that is spun up and send that config file to the Nagios server in the /usr/local/nagios/etc/import directory and then when we do an Apply Config, it would pick up the hosts (along with the services assigned to the host group). I've got the script and transfer the file to Nagios part working.

Where I'm struggling is trying to figure out how to add these hosts to a host group that inherit the pre-determined services for that particular VM type where each host has a predefined group based on function (some use apache, some use java, some use MySQL, etc, etc, etc and that's how we group them). Most of the hosts share the same types of checks, but each have specific checks added based on what they do.

For whatever reason, I'm truly not understanding the OO piece of setting up a host group with services... Maybe I'm just making it way harder than I need to?

Is there a step-by-step tutorial on setting this up? Or can someone walk me through this?

Posted: **Fri Apr 01, 2016 1:34 pm**

highness wrote:Where I'm struggling is trying to figure out how to add these hosts to a host group that inherit the pre-determined services for that particular VM type

I might not be understanding your requirements, but doesn't this just boil down to assigning a service to a hostgroup?

https://assets.nagios.com/downloads/nag ... ml#service

The hostgroup_name line in the service definition will accomplish this for you, then any host added to that group gets the check.

Posted: **Mon Apr 04, 2016 10:37 am**

I think I may be making this harder than I need to.

I was thinking that I need to create a service group (with the associated service checks) and then assign the service group to a host group, then assign hosts to that host group.

Am I wrong?

Posted: **Mon Apr 04, 2016 11:00 am**

highness wrote:I was thinking that I need to create a service group (with the associated service checks) and then assign the service group to a host group

This cannot currently be done directly. You will want to add the hosts to a host group, then assign whatever services directly to that host group.

Posted: **Mon Apr 04, 2016 12:46 pm**

The other dilema that I have is that I have two types of hosts (with different configurations and different types of checks) and I really need to group into the same logical group - similar to this:

Web Portal

Code: Select all

Hostname                            Server Type
box1.ourcompany.com                  tomcat
box2.ourcompany.com                  tomcat
box3.ourcompany.com                  tomcat
box4.ourcompany.com                  tomcat
lbal1.ourcompany.com                 load balancer
lbal2.ourcompany.com                 load balancer

API Portal

Code: Select all

Hostname                            Server Type
box5.ourcompany.com                  jboss
box6.ourcompany.com                  jboss
box7.ourcompany.com                  jboss
box8.ourcompany.com                  jboss
lbal10.ourcompany.com                load balancer
lbal12.ourcompany.com                load balancer

Is there an easy way to group those together as a host group? If I'm understanding this correctly, is that if I put these different hosts into the same host group, they will share the same checks (and some won't apply to each other).

Does that make sense?

Posted: **Mon Apr 04, 2016 3:45 pm**

You can use multiple hostgroups:

Code: Select all

Name: portals
Members: web_portal, api_portal
Services attached: All services that both web_portal and api_portal hostgroups should get

Code: Select all

Name: web_portal
Members: wp_tomcat, wp_lb
Services attached: All services that both wp_tomcat and wp_lb should get

Code: Select all

Name: wp_tomcat
Members: All Web Portal tomcat hosts
Services attached: All the tomcat services

Code: Select all

Name: wp_lb
Members: All Web Portal load balancer hosts
Services attached: All the web portal load balancer services

Code: Select all

Name: api_portal
Members: api_jboss, api_lb
Services attached: All services that API portal hosts should get

Code: Select all

Name: api_jboss
Members: All API portal jboss hosts
Services attached: All API portal jboss services

Code: Select all

Name: api_lb
Members: All API Portal load balancer hosts
Services attached: All the API portal load balancer services

If you had a generic set of services that you would like applied to ALL load balancers you could create a new one:

Code: Select all

Name: generic_lb
Members: wp_lb, api_lb, etc
Services attached: All the generic load balancer services

Then when you add a new host you could just set their hostgroup to the bottom level and they would inherit all of the proper services.

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