update self-hosted-with-docker docs

[fvanzee]

Fix scheduler arguments to prevent "no space left on device" error

Description

Adding the --etcd-data-dir=/var/lock/dapr/scheduler argument for the scheduler service in the docker-compose example.

Edit 20250211: Increase the tmpfs size from 10000 bytes to 64m. Ealier change setting --etcd-data-dir was only a workaround.

Very simple change to resolve dapr/dapr#8207

Issue reference

dapr/dapr#8207

[msfussell]

LGTM

Need another check

[cicoyle]

Setting --etcd-data-dir helps avoid the immediate no space left on device error by redirecting writes to a different location, but it's more of a workaround. If etcd is consuming significant space, the root issue is likely insufficient storage in the container. Have you tried increasing the volume size or mounting a persistent volume with more space?

[fvanzee]

Setting --etcd-data-dir helps avoid the immediate no space left on device error by redirecting writes to a different location, but it's more of a workaround. If etcd is consuming significant space, the root issue is likely insufficient storage in the container. Have you tried increasing the volume size or mounting a persistent volume with more space?

Yes I did also try to increase the tmpfs size (if you are referring to that) to 10x the size described in the doc, which didn't resolve the issue. I will try to mount a persistent volume, and see if that does work.

[fvanzee]

Alright after some experimenting it does look like the tmpfs size was too low.

It's set to 10000 bytes which is apparently too low for etcd.
Through trial and error I noticed it should be al least set to 64m. So I wasn't even close with my 10x experiment earlier.

I'll update the documentation to set the tmpfs size to 64m to this and remove the --etcd-data-dir argument.

[cicoyle]

Thanks for taking the time to figure this out - Im fine increasing the size to make sure others don't run out of space as well.

[msfussell]

LGTM

[marcduiker]

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