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Running tcpdump on an OpenShift cluster
3 min read
If we want to take a look at the network traffic that we get out of an OpenShift node we can use the oc debug command to spin up a privileged pod with tcpdump installed. This way we don't need to ssh into the worker node.
22/05/2023
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tcpdump: filter DNS queries
2 min read
When a DNS change is involved in an ongoing issue, we need to be sure when we use, for example curl, whether we are hitting the new or the old resource. Is that DNS record still cached locally? One of the best ways of checking this is by sniffing the DNS traffic using tcpdump
30/03/2021
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From pet to cattle
Treat your kubernetes clusters like cattle, not pets