[Suggestion] - Add the option to add a local proxy container in de application pod when the Base URL is not reachable from within the pod

[ChampiYann]

Suggestion

We are running into the following situation:
Jira needs to be able to reach itself using the base URL but the ingress controller we have at our disposal does not allow connections from within the cluster. Therefore there is no path to the base URL and Jira cannot work properly.
Similarly Confluence needs to be able to reach synchrony through the same URL as user do, which is the URL configured at the ingress controller. Therefore Confluence synchrony do not work properly together.
Another related issue is the creation of an application link which does not work due to the same problem when running both applications in the same cluster.

One solution would be to add a proxy container to the application pod and "trick" the application to connect to it instead when the application connects to the base URL.
The Jira proxy would then redirect Jira traffic to the Jira container within the pod and the Confluence proxy would redirect synchrony traffic to the synchrony service.
Additionally this proxy could be used by Jira and Confluence to reach each other using their respective services instead of the ingress controller.

The implementation could look something like this: https://github.com/ChampiYann/data-center-helm-charts/tree/local-proxy

Proposed network flow diagram:

graph TB
client --TCP/443--> ingress-controller
subgraph cluster
  ingress-controller --TCP/80--> jira-svc
  ingress-controller --TCP/80--> confluence-svc
  subgraph jira-ns
    jira-svc{jira-svc} --TCP/8080--> jira
    subgraph jira-pod
      jira --TCP/443--> jira-proxy[proxy]
      jira-proxy --TCP/8080--> jira
    end
  end
  subgraph confluence-ns
    confluence-svc{confluence-svc} --TCP/8090--> confluence
    synchrony-svc{synchrony-svc} --TCP/8091--> synchrony-pod
    confluence-proxy --TCP/80--> synchrony-svc
    subgraph confluence-pod
      confluence --TCP/443--> confluence-proxy[proxy]
    end
  end
end
jira-proxy --TCP/80--> confluence-svc
confluence-proxy --TCP/80--> jira-svc

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Product

Jira, Confluence

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