How to overwrite MACRO values from the configuration of the Zabbix Agent?

[mgarcia]

Currently, Im using the Template "Apache by Zabbix agent" in a Autoregistration action.

I would like to know if there is any possibility that from the Zabbix Agent configuration the value of a MACRO of the template can be setup.

For example, I would like to set from the Agent the value of APACHE.STATUS.PORT because different servers can have Apache listening in different ports, so instead of having different templates in the Zabbix server, I could set the port in the server itself.

And another question, is it possible that a configuration option set in zabbix_agent2.conf can be overridden by loading another .conf file that has been loaded with the "Include" option?

Thank you very much,

[cyber]

User macros can also be set on host level. And that is the place where Zabbix looks first

https://www.zabbix.com/documentation/6.0/en/manual/config/macros/user_macros

Zabbix resolves macros according to the following precedence:

1. host level macros (checked first)
2. macros defined for first level templates of the host (i.e., templates linked directly to the host), sorted by template ID
3. macros defined for second level templates of the host, sorted by template ID
4. macros defined for third level templates of the host, sorted by template ID, etc.
5. global macros (checked last)

But, if you want to do it during autoreg, then you probably have to whip up somekind of a script, that will update host macro during the registration process. Script execution via "send message to.."

About include files... I think yes, if you include a file, it is read after initial config file, thus values will override initial values. It is very easy to test, I suppose..

[mgarcia]

Thank you very much for your response,

I have been reading that documentation but, to be honest, it was not clear to me where do I have to set those values.

What I want is that these values:


Or.... in that value, I have to add a command to retrieve the value from the host..... the documentation it's not very clear to me.

And about the Include files, I can tell you that, for example, by default when installing the agent2, the file "zabbix_agent2.conf" has the value "Server=127.0.0.1" and "ServerActive=127.0.0.1" and in another file I try to override those values without luck.

[cyber]

If you already have added template to a host, you can go to hosts config, Macros section and press "inherited and host macros", you should see those macros now. If you press "change" and enter a new value, you are effectively creating a host level macro with same name and different value. After that it appears also to "host macros". As host level is searched first, value is taken from there and the one from template is ignored.
If you plan to insert such macros already on autoreg, you just need to know exact macro name and insert it to host config. Later, if viewing over GUI, it will appear same as previously explained under "macros" -> "host macros".

Maybe you should take closer look, what and where did you include.. I just tested with Server and ServerActive.. main file set them to "localhost" and I overwrite them in included file with correct values... worked just fine. Your include lines should be after the parameters you are trying to override..

[mgarcia]

Oh, from you reply I think I didn't explain myself correctly. I don't want to change the value of the MACRO in the GUI directly in the host, I don't want to do it here



What I want is that based in some parameter added in the Agent configuration file or in the server itself, that "85" value is sent to the Zabbix Server from the agent, so in that way, I can have 2 different servers with autodiscovery, and each of them sent for example, the Apache port that is configured.

So server1 would send, for example, "80", and server2 would send "85". That way, the template for both of them is the same and from the agent I can decide to which port should the agent be checking Apache.

I want that the value APACHE.STATUS.PORT is dynamically set from the Agent, not setting it up in the Zabbix Server GUI

[mgarcia]

Maybe you should take closer look, what and where did you include.. I just tested with Server and ServerActive.. main file set them to "localhost" and I overwrite them in included file with correct values... worked just fine. Your include lines should be after the parameters you are trying to override..

yes, you are right, that works. I had a typo in the parameter name and now the parameter is overwritten properly.

[cyber]

If you want something to happen based on info in agent config file, then you probably need to populate HostMetadata parameter and then do tricks with it during autoregistration... Never tried it myself...

[mgarcia]

Thank you very much anyway for your time.

I'm already using the Hostmetadata approach to assign a different copy of the template based on that, but I find it nasty. So I have:

Server1
HostMetadata=:env=uat:app=apache80:

Server2
HostMetadata=:env=uat:app=apache85:

And then two autoregistrations actions to apply the a copy of the Apache template with the PORT macro set to the value that the HOST needs.... but I think there should be a better way to achieve this.

[cyber]

Condition: host medatadata contains "whatever" -> operation: send notification to API capable user over a script type media, which takes {HOST.METADATA} and {HOST.HOST }as input and does things in background over API.. ie. setting host level macros for template..:P
Can get away with one action. And your script can have a lot of different subsections based on metadata keywords.

[mgarcia]

Thanks again; I will try to figure it out. I will post the solution here if I found something