Using VPC Flow Logs to troubleshoot GKE workloads
Having visibility into your network traffic is essential to operating Kubernetes environments effectively. When a service slows down or loses connectivity, knowing who is talking to whom lets you narrow the problem down quickly. In a standard cloud network, flow logs provide that view by recording connections between IP addresses, ports, and protocols. In Kubernetes, however, pods are temporary. Their IP addresses change constantly as pods scale, crash, or move between nodes, so a raw log entry showing 10.4.2.18 talking to 10.4.8.44 tells you little about which workload (and pod) owned that address, what namespace it was in, or what application it was trying to reach. By the time you search your cluster, the pod may already be gone!
In a Google Cloud environment, VPC Flow Logscloses this gap at the network layer. Google Cloud's virtual network already sees every connection a pod makes, so each sampled flow is...
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