RHEL 8

Dear Rudolf,

Could you show us exact error message you seen?

Cannot create group: group with the same name "Kubernetes/Nodes/Role: master" already exists.

Cannot create group: group with the same name "Kubernetes/Nodes/Role: worker" already exists.

^^ this is taken from a "red exclamation mark" next to: Node LLD: Cluster node discovery

The host prototype for this rule actually has a group prototype "Kubernetes/Nodes/Role: {#ROLES}". 

Hi,
The LLD rule actually checks that the group was created by the same LLD rule. You can fix the situation by adding in the group name, for example, the name of the cluster {HOST.NAME}: Kubernetes/Nodes/Role: {#ROLES}
I will clarify if there are any blocking reasons to remove the check that the group from the prototype was created by this particular rule. But I assume that it's about deleting objects (when entities associated with this group are no longer discovered by specific rule)

Regards, Elina

Elina, I like your idea of adding the Cluster Name into the group Name because that makes handling of a larger amount of clusters more easy and it looks more tidy. But this is not working since that variable is not allowed to be used with group prototypes. If i try to save that change i get: 

• Error in query [DELETE FROM group_prototype WHERE group_prototypeid='130'] [Cannot delete or update a parent row: a foreign key constraint fails (`zabbix`.`group_discovery`, CONSTRAINT `c_group_discovery_2` FOREIGN KEY (`parent_group_prototypeid`) REFERENCES `group_prototype` (`group_prototypeid`))]
• SQL statement execution has failed "DELETE FROM group_prototype WHERE group_prototypeid='130'"

Please give me some time I'll try to reproduce this

Can you check which host group has id 130? (you can simply find it in the address bar when Host group configuration window is open)

https://...hostgroups.php?form=update&groupid=130

No permissions to referred object or it does not exist!

Hi,
ZBXNEXT-7739 (Possibility to add host discovered with host prototypes to an existing group via group prototype) You can vote and comment if you are interested in this

I can't reproduce the error with the group. You can now describe the sequence of your actions - this will simplify the task

{HOST.HOST} or {HOST.NAME} really won't work here. I have created ZBX-21172 so that we find the option convenient to automate host group creation in the template.
Now as an option, you can add to the group name or cluster name explicitly or through a User macro (which must be defined on each parent host)

By error of deleting a group, I can’t reproduce it in any way - I at least need that order of actions you have done (adding hosts, linking-unlinking a template, deleting-adding groups, etc).

The "deletion" is not really a "deletion" in the sense of trying to delete a group. It just happens if i add the {HOST.NAME} to the group prototype and try to save it. Thanks for opening the new bug! Thank you for looking into the problem!

Hi,
yes, I understand that it can be not really deletion - but in any case, there shouldn't be any 'constraint fails'. But i can't catch the same error (I was trying to reproduce in several ways) Creating LLDs that used same group created from the prototype on same host and on different ones. There is no error when i change group name.
Is this error still reproducible on your instance?

Hi Elina,

Sorry for the late reply, actually i had time to toy a bit with changing the group prototype with the host prototype. For some reason i can not change to anything else even adding some simple "test" string to the actual group name does not work. I was able to change it some point, before i had added the template to the hosts and it discovered nodes. Hope this helps.