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814d38f3ed
Show how to run `tcpdump` from a pod.
Customers can review and specify alternative
command-line args to `tcpdump`.
Compare with the existing procedure that
supports using a single node or container.
* Address comments from Mehul.
* Change the example to show the `--timeout`
argument for must-gather rather than the
`timeout` command that is part of RHCOS.
* Comments from Alex:
* Yield to the temptation to ack that other
commands _could_ be run.
* Ditch the env vars because the separate
dirs are adequate.
* Very helpful review comments from Chris T.
35 lines
1.5 KiB
Plaintext
35 lines
1.5 KiB
Plaintext
// Module included in the following assemblies:
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//
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// * support/gathering-cluster-data.adoc
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[id="support-network-trace-methods_{context}"]
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= Network trace methods
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Collecting network traces, in the form of packet capture records, can assist Red Hat Support with troubleshooting network issues.
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{product-title} supports two ways of performing a network trace.
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Review the following table and choose the method that meets your needs.
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.Supported methods of collecting a network trace
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[cols="1,4a",options="header"]
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|===
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|Method
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|Benefits and capabilities
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|Collecting a host network trace
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|You perform a packet capture for a duration that you specify on one or more nodes at the same time.
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The packet capture files are transferred from nodes to the client machine when the specified duration is met.
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You can troubleshoot why a specific action triggers network communication issues. Run the packet capture, perform the action that triggers the issue, and use the logs to diagnose the issue.
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|Collecting a network trace from an {product-title} node or container
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|You perform a packet capture on one node or one container.
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You run the `tcpdump` command interactively, so you can control the duration of the packet capture.
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You can start the packet capture manually, trigger the network communication issue, and then stop the packet capture manually.
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This method uses the `cat` command and shell redirection to copy the packet capture data from the node or container to the client machine.
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|===
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