tests/README.md: add troubleshooting advice

Add a paragraph to deal with a condition that I have encountered on my machine. Change-Id: Ie03a0e8ab4030973cdec8e84cd5877234830b8de Reviewed-on: https://go-review.googlesource.com/c/pkgsite/+/626856 LUCI-TryBot-Result: Go LUCI <[email protected]> kokoro-CI: kokoro <[email protected]> Reviewed-by: Hyang-Ah Hana Kim <[email protected]> Reviewed-by: Robert Findley <[email protected]>
golang · Nov 13, 2024 · dbac787 · dbac787
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diff --git a/tests/README.md b/tests/README.md
@@ -101,3 +101,10 @@ If the tests fail with diffs, a file with the diffs will be created in the
 testdata directory that show the cause of the failure.
 
 Use `./devtools/docker/compose.sh logs` to get detailed logs of the docker containers.
+
+### Troubleshooting
+
+If docker fails with "connect: cannot assign requested address" during `run.sh`,
+try running it again. It will eventually succeed. Do not pass the '-rm' flag so that
+prior state is preserved.
+You can also try reducing the value of cmdgonetlimit in devtools/docker/compose.yaml.