/dev/shm missing in 12.2 about operating-system HOT 3 CLOSED

Updating Home Assistant Operating System to 12.2 has removed /dev/shm, I see no mentions of it in the release notes so it seems like a regression. If I am wrong and this was intended please enlighten me and close this :)

It shouldn't be removed, it might be read-only though due to a behavior change in Docker 25. This got fixed in Supervisor (see #4997). However, it seems that when the container has been created with the old Supervisor version, then Docker 25 gets updated (HAOS 12.2 installed), the fix we did to work around the behavior change doesn't get applied.

Long story short: Use ha core rebuild to recreate the Core container. This should bring back shm access.

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Hmm, when I check /dev/shm using the "Advanced SSH & Web Terminal" addon (without safe mode) it looks writeable. I tested and created an empty file in there just fine. I have limited knowledge about both Home Assistant and docker, maybe something related to startup order? ( or it could be me missing something )

I did try your workaround, ha core rebuild, and it works. Recorder now starts properly. Thanks! Is this something that would be needed after each upgrade or just once because of the upgrade to Docker 25?

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Hmm, when I check /dev/shm using the "Advanced SSH & Web Terminal"

That is another container, so not the same world as Core sees.

I did try your workaround, ha core rebuild, and it works. Recorder now starts properly. Thanks! Is this something that would be needed after each upgrade or just once because of the upgrade to Docker 25?

Just because of Docker 25.

Thanks for confirming. Closing then.

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