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Created October 27, 2021 23:15
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take a thread dump from a docker container running a mono process
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get-thread-dump.md

take a thread dump from a docker container running a mono process

...when the container has no shell, so docker exec -it won't work.

steps

identify the Container ID of the problematic container

$ docker stats

find the PID of the app process (it may not be the main PID; if it were, docker kill would work)

$ docker container top abcd1234

send SIGQUIT to the app process

$ sudo kill -QUIT 1234567

extract the logs to a file

$ docker logs abcd1234 > dump.txt
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