I'm working as a DevOps engineer managing a Kubernetes setup where my application pods communicate with Consul over HTTPS. Upon startup, the services fail to connect to the Consul client through the internal cluster DNS, logging a "connection refused" error. The logs show that the Consul client pods are healthy and running without any restarts, and the Consul cluster logs confirm that clients have joined the cluster before the services attempt to connect. After about 10-15 seconds, the services retry and succeed in fetching their keys using the Consul KV API, but the initial error is transient. Has anyone encountered a similar issue or have suggestions for making the startup process more dependable?
3 Answers
Have you checked your etcd logs? Slow writes to etcd can lead to issues if a service needs to connect to the Kubernetes API during startup. However, it seems like in your case, since the app pod is already running and DNS resolves correctly, it might be a direct network problem. It could also still be related to network policies in your app namespace.
If you don't have access to the application code, your best bet is to reach out to your client team to see if they can help troubleshoot the issue further. They might have insights about the application behavior during startup.
It sounds like you might be running into some network policy issues. Sometimes, specific network policies need to be activated when the pod starts, which can cause these kinds of connection problems. Check your network policies and see if they might be blocking outbound connections initially.
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