"zero-trust" security / networking for training jobs

[astefanutti]

What you would like to be added?

Secure, ideally by default, the data plane of the jobs managed by the training operator.

This would include:

• The creation of NetworkPolicies that prevent ingress traffic to the training jobs, i.e., only intra-job Pod-to-Pod communication is allowed
• The configuration of (m)TLS for Pod-to-Pod communication wherever possible, or provide some documentation on how to achieve it, possibly using external solution like a service mesh for example.

Why is this needed?

In multi-tenant setups, it's important to guarantee tenants are isolated from each other.

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