I'm currently managing an Istio Ambient Mesh and want to secure a particular namespace called 'ai-namespace'. My aim is to ensure that the applications within this namespace are only able to send requests specifically to the ChatGPT API at api.openai.com, blocking all other external connections. I'd prefer not to set the global outboundTrafficPolicy.mode to REGISTRY_ONLY, as that would disrupt egress traffic for other namespaces in the cluster. I'm looking for the best method to 'jail' this one namespace using Waypoint proxies and AuthorizationPolicies. Has anyone successfully implemented this without utilizing sidecars?
2 Answers
You might want to try using NetworkPolicies to handle this. They can define rules to control traffic flow to and from your pods, but remember they primarily operate at Layer 3/4. You may need something that gives you Layer 7 control for more granular settings, like virtual services in Istio if you're trying to manage HTTP routing specifically.
That's right about NetworkPolicies, they're not going to cut it for Layer 7 requirements. Have you considered using Istio authorization policies combined with your virtual services? They can be a powerful way to limit access to just the ChatGPT API in your targeted namespace without disrupting the other namespaces. It allows for precise control over HTTP traffic.
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