Fetch container IP address of some service which has started and assign it to deployment env var of another service

[vlistratenko]

Hello everyone,

Please, help with solving my issue.

I have a deployment as follows:

  - name: portfoliomanagement
    helm:
      componentChart: true
      values:
        containers:
          - image: ${service_image}
            env:
              - name: VAULT_ADDR
                value: ${vault_addr}
              - name: VAULT_TOKEN
                value:  ${vault_token}
            name: portfoliomanagement                       
        service:
          ports:
            - port: 80

My portfoliomanagement service needs to talk to Vault which is described and deployed in same devspace.yaml file.

The issue is that I need somehow to read IP address of deployed Vault service and assign it to ${vault_addr} env var of deployment.

I've tried different approaches but nothing worked. I'm able to fetch the IP address but not to properly assign to env var.

Please, share some ideas. Thanks in advance.

[LukasGentele]

@vlistratenko Why wouldn't you just use the cluster-internal DNS and connect to vault via the DNS hostname of the Kubernetes service that points to the vault pod? E.g. [vault-service-name].[vaul-namespace].cluster.local ? Your cluster should have a DNS service that resolved this hostname to the IP of the Kubernetes service.

[vlistratenko]

@LukasGentele thanks a lot for the suggestion. I will try that out.
I've solved my issue by just using service_name instead of ip address I was looking for.

However, interesting thing is that such approach only works on aws k8s cluster. Locally it does not work. As a workaround(for local) I do devspace dev and see which IP addresses are assigned to the services. They are always static. So, I re-run devspace dev again and put them instead of service_name everywhere.

But I'm gonna test your solution to see if it works. Thanks again Lukas!