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It seems like you've done a thorough job in setting up the security groups and policies, but there are a few potential areas to investigate further.
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Probes and Health Checks:
- Probes are used by Kubernetes to determine the health of your pods. If you haven't explicitly defined probes in your pod specifications, Kubernetes uses default settings. Ensure that your security groups allow inbound communication from the security group applied to your nodes (for kubelet) over any ports that may be configured for probes.
- Check your pod specifications for liveness and readiness probes. These probes could be using ports that are not allowed by your security groups.
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CoreDNS Communication:
- Although you mentioned that your security group allows all egress traffic, ensure that the security groups for your pods are indeed allowing outbound communication over TCP and UDP ports 53 to a security group assigned to the Pods (or nodes that the Pods run on) running CoreDNS.
- Confirm that your CoreDNS security group allows inbound TCP and UDP port 53 traffic from the security group specified.
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Control Plane Communication:
- In Fargate, you might not directly control the node instances, but you still need to ensure that your security groups allow the pods to communicate with the Kubernetes control plane.
- Make sure that the security group for your pods allows the necessary communication with the Kubernetes control plane. You can specify the cluster security group as one of the security groups in your Pod Security Policy.
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Instance Type Limitations:
- Even though you're using Fargate and don't directly control the instance types, it's worth checking if there are any known limitations or issues related to Fargate instance types.
- Ensure that the Fargate instance type you're using is supported and that there are no restrictions that might be causing the pods to get stuck in the Pending state.
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Logs and Events:
- Check the logs and events associated with your pods, nodes, and the Fargate infrastructure. They might provide more specific information about why the pods are stuck in the Pending state.
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Network Interfaces:
- Although you don't directly manage instance types in Fargate, it might be worth checking if there are any limitations or known issues related to network interfaces in Fargate.
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AWS Support:
- If the issue persists, consider reaching out to AWS support. They can provide more in-depth analysis and assistance, especially if there are specific platform-related issues or limitations that need attention.
By systematically going through these points, you should be able to identify and resolve the issue causing your pods to be stuck in the Pending state.
answered 5 months ago
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