
Troubleshoot pod traffic with nsenter and tcpdump tools
When a pod fails to contact another network resource, logs might provide some hints, but sometimes the ultimate evidence of what is happening can be seen from a tcpdump packet capture; however, not all pods have tcpdump tools or even a shell to interact with. This blog post demonstrates how to use certain tools available in OpenShift and GNU/Linux to overcome those challenges and use tcpdump to validate network traffic in pods deployed on top of OpenShift clusters.