Latest Update broke docker

[tiagoefreitas]

With latest update I got this error:
Failed to start docker.service: Unit docker.socket not found

Trying to fix it, copied /lib/systemd/system/docker.service to /etc/systemd/system/ again, and added "--storage-driver=devicemapper" to ExecStart but it fails:

INFO[2018-11-18T20:59:44.991739905+01:00] parsed scheme: "unix" module=grpc
INFO[2018-11-18T20:59:44.991767056+01:00] scheme "unix" not registered, fallback to default scheme module=grpc
INFO[2018-11-18T20:59:44.991828102+01:00] parsed scheme: "unix" module=grpc
INFO[2018-11-18T20:59:44.991849189+01:00] scheme "unix" not registered, fallback to default scheme module=grpc
ERRO[2018-11-18T20:59:44.992001497+01:00] Failed to GetDriver graph driver=devicemapper error="graphdriver plugins are only supported with experimental mode" home-dir=/var/lib/docker

May want to fix onlyoffice.sh

[tiagoefreitas]

Problem was ubuntu docker update missing devicemapper plugin, see here:

docker/for-linux#452

[enoch85]

Thanks for posting!

Let's wait and see if it will remain or if we (OnlyOffice, Collabora and everyone else using devicemapper) have to change to something else

[enoch85]

Could you please try a fresh install and see if it works with overlay2 instead here: https://github.com/nextcloud/vm/blob/master/apps/onlyoffice.sh#L83-L87?

Thanks!

[tiagoefreitas]

Is devicemapper required?
I can't do a fresh install but I can try to change it and test.

[tiagoefreitas]

Doesn't work for me, but my system is modified I'm running zfs on root filesystem with luks.

'overlay2' is not supported over zfs storage-driver=overlay2

Decided to revert docker-ce to previous version for now

[enoch85]

@tiagoefreitas Ah ok I see. It would be very helpful if you could put up a test system / VM just to test if it works with overlay2. In that case we'll change.

IIRC it didn't work with overlay2 and that's why we went with devicemapper.

[enoch85]

I just updated my server to the latest version (Ubuntu packages including Docker) and the Collabora docker image, everything is working even after a reboot. Hmm...

[enoch85]

OK, I just confirmed, it broke on my other server when changing to overlay2.

So I will hold the docker update for now.

[enoch85]

For referance: #546

[enoch85]

Posted bug report with Collabora: nextcloud/richdocuments#313

[enoch85]

And with Onlyoffice: ONLYOFFICE/docker-onlyoffice-nextcloud#3

[enoch85]

This is quite interesting though....

https://fribeiro.org/tech/2018/02/13/collabora-docker-nextcloud/

[tiagoefreitas]

Wont work for me anyway since it doesn’t support zfs...

…

On Mon, 19 Nov 2018 at 19:11, Daniel Hansson ***@***.***> wrote: This is quite interesting though.... https://fribeiro.org/tech/2018/02/13/collabora-docker-nextcloud/ — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#713 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AK6WxmxVJwyxMbbfJ2lsRnxqGb2dzGI3ks5uwwJWgaJpZM4YoHIU> .

[enoch85]

doesn’t support zfs...

You win some, you lose some. :)

[tiagoefreitas]

Found this in docker info:
WARNING: devicemapper: usage of loopback devices is strongly discouraged for production use.
Use --storage-opt dm.thinpooldev to specify a custom block storage device.
WARNING: No swap limit support

It means performance can be improved?

I found when changing storage drivers, this needs to be done, will test better:
https://meta.discourse.org/t/how-to-change-storage-backend-in-docker/75352

Ended up changing to zfs and it works for me, even better performance than before.
Can work here too if you store docker inside the ncdata zfs pool.

Instructions here:
https://docs.docker.com/storage/storagedriver/zfs-driver/#configure-docker-with-the-zfs-storage-driver

[enoch85]

@tiagoefreitas Do you think you could prepare a PR for storing it in ZFS? Would be great to have a future proof way of doing it since devicemapper isn't optimal.

[enoch85]

Or I maybe solved it with overlay2 instead. Let's see if Collabora works as well... Onlyoffice is fixed anyway.

[enoch85]

It works with Collabora as well. This issue is now fixed.