Hazelcast Client in DNS LookUP mode in Kubernetes

[Vishnu K Raj]

I can see that in the hazelcast server side there is an option to use either the kubernetes API or DNS LookUP. I have used DNS Lookup and it is working. But while configuring the client I can't find an example of using DNS Lookup, all scenarios are using the Kubernetes API. Does hazelcast client support dns lookup mode?

[Rafal Leszko]

Hi Vishnu,

Yes, Hazelcast Kubernetes Plugin supports DNS Lookup for clients. Please keep-in mind that it'll work only if the client is deployed on the same Kubernetes cluster as the Hazelcast server.

Sample configuration YAML:

hazelcast-client:
  network:
    kubernetes:
      enabled: true
      service-dns: MY-SERVICE-DNS-NAME

On Fri, Oct 4, 2019 at 12:40 PM Vishnu K Raj <vishn...@cleartrip.com> wrote:

I can see that in the hazelcast server side there is an option to use either the kubernetes API or DNS LookUP. I have used DNS Lookup and it is working. But while configuring the client I can't find an example of using DNS Lookup, all scenarios are using the Kubernetes API. Does hazelcast client support dns lookup mode?

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Rafał Leszko

Software Engineer

ra...@hazelcast.com

@RafalLeszko

[ivin...@gmail.com]

I am getting the follwing exeption while trying the DNSlookup.

any idea?

spec.clusterIP: Invalid value: "None": field is immutable

when i am trying the DNS

[Rafal Leszko]

It looks like more related to the Kubernetes configuration, not Hazelcast itself.

My guess is that you try to update existing service and change its clusterIP, but you can't do it because clusterIP cannot be updated (it's immutable in the Kubernetes service resource). 

So you need to:

1) delete the service 

2) create it again with a different clusterIP

Cheers,

Rafał

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Rafał Leszko Software Engineer       hazelcast®

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