"Missing host information" message at Overview of workload section when monitoring kubernetes

[MariettaAlmeida]

Hi @DanielS which deployment option should i use? used the operator installation from the wizard on deploy oneagent on kubernetes/openshift

[DanielS]

@MariettaAlmeidaNormally I used ClassicFullStack but If the devs use Fargate I need to use Application Monitoring.

Do you have access to the Kubernetes Environment? can you check the DynaKube resource?

https://github.com/Dynatrace/dynatrace-operator/blob/v0.13.0/assets/samples/classicFullStack.yaml

[MariettaAlmeida]

@DanielS actually no but i reading about it, i used the classicFullstack option.

Can you give me use cases that can help me identify which deployment option should i use?

[DanielS · Accepted solution]

Yes, I love this page, it is very well documented here with its capabilities and limitations for each case. I mainly use Classic, but Fargate only supports Application Only, and always on Fargate I see Missing Host Information which has a lot of sense because is serverless.

But in your case is not normal, I guess that an error could be seen using describe in the pod from the kubectl CLI.

[MariettaAlmeida]

😲ok, will check with the client then and thank you for the documentation !

have a nice day @DanielS 

[MariettaAlmeida]

hi all,

im monitoring kubernetes and at the pods information section inside the "overview of the workload" chart, in the host tab appears "Missing host information"

Which infom should appear here and how can i obtain this info ? 

Thanks in advance you all

[DanielS]

Hi @MariettaAlmeida the Missing Host Information on Kubernetes could be a normal situation depending on the Kubernetes deployment option you choose.

[SureshThakur]

Hi @DanielS 

I too get this error very often on workload page.

I am using classicFullStack mode

What are the most common reason for this message? 

[Mizső]

Hi @SureshThakur ,

Missing host infromation could be based on my experience:

1. Node selector is used in the custome resource yaml. Eg. oneagents pods are only on worker nodes. In this case when you check the workloads/pods you can see host information only at workloads/pods which ones are on worker nodes. In case of workloads/pods which ones are on infra or master node you could see missing host information.

2.If you creatre a Management Zone for example to a namespace (including workloads/pods), but you do not add the kubernetes nodes you can also meet with this missing host information message.

I hope it helps.

Best regards,

Mizső  

[DanielS · Accepted solution]

Hello @SureshThakur this is not necessarily an error, for example, in my case I have several Kubernetes deployments but some of them have AWS Fargate, as a FaaS you don't have a host, you only pay for CPU and Memory, in those cases you see the Missing Host Information. Other cases for this could be that you don't have theployed OA on the host (worker) where is running the Pod.

[SureshThakur]

Thanks @DanielS @Mizső  for your response. This clarifies my doubt.