Output of executed ephemeral command

1

I’m attempting to run an ephemeral command in an Incus OCI image and capture or redirect its output, similar to docker run -rm <image> <command> <args> > myfile, following these instructions to setup Apache Guacamole.

I can verify that the output is correct by running a non-ephemeral instance, then incus execing into it to run the command, at which point I get the desired output.

However, if I run incus launch docker:guacamole/guacamole --console --ephemeral -c oci.entrypoint="/opt/guacamole/bin/initdb.sh --mysql" I get one of two results:

Launching the instance
Instance name is: gorgeous-stud
To detach from the console, press: +a q
Error: Failed running forkconsole: “container is not running: "gorgeous-stud"”

Or:

Launching the instance
Instance name is: driven-sole

Error: Invalid PID ‘�’

Neither of which are useful :slight_smile:

Am I doing something wrong? Or, is this even possible? I’m running Incus 6.15 by the way.

2

That suggests it died so quickly that the console couldn’t attach.

Can you start it with just incus start and then run incus console --show-log to see the full console output?

3

The logs consists of the SQL output I was expecting to be dumped to the console.

On the back of your suggestion, I’ve added a shell with sleep and it now works:

incus launch docker:guacamole/guacamole --ephemeral --console -c oci.entrypoint=‘/bin/sh -c “sleep 1; /opt/guacamole/bin/initdb.sh --mysql”’

Thanks for the prompt response and the pointer.

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