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Move containerd.service from Requires= to Wants=#512

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tianon:wants-containerd
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Move containerd.service from Requires= to Wants=#512
tianon wants to merge 1 commit intodocker:masterfrom
tianon:wants-containerd

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@tianon tianon commented Dec 5, 2020

Per the systemd.unit documentation:

If this unit gets activated, the units listed will be activated as well. If one of the other units fails to activate, and an ordering dependency After= on the failing unit is set, this unit will not be started. Besides, with or without specifying After=, this unit will be stopped if one of the other units is explicitly stopped.

Often, it is a better choice to use Wants= instead of Requires= in order to achieve a system that is more robust when dealing with failing services.

This should also be generally "safe" given we added --containerd=/run/containerd/containerd.sock to the flags we pass to dockerd.

See #511 (comment).

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thaJeztah commented Dec 5, 2020

love the typo; its on theme 😇

@tianon tianon changed the title Move conatinerd.service from Requires= to Wants= Move containerd.service from Requires= to Wants= Dec 5, 2020
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tianon commented Dec 5, 2020

love the typo; its on theme

I have no idea what you're talking about!! (it's fixed 😇 ❤️)

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tianon commented Dec 8, 2020

I have verified that with this change, I'm able to systemctl restart containerd without Docker going down (and that it does successfully reconnect to containerd).

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thaJeztah commented Dec 8, 2020

Thanks! I actually recalled I left this as a comment for follow up on #508

We may want to look into using Wants= instead of Requires=, because
that allows docker to continue running if containerd is restarted, quoting
the systemd documentation:

Often, it is a better choice to use Wants= instead of Requires= in order
to achieve a system that is more robust when dealing with failing services.

Given that docker will likely still fail if the containerd socket is not
present, startup will fail if containerd is not running, but if containerd
is restarted, the docker daemon may be able to try reconnecting.

thaJeztah
thaJeztah previously approved these changes Dec 8, 2020
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LGTM

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thaJeztah commented Apr 2, 2021

@tianon looks like this needs a rebase 😅

@tianon
Move containerd.service from Requires= to Wants=
7aa6d8d 
Per the systemd.unit documentation:

> If this unit gets activated, the units listed will be activated as well. If one of the other units fails to activate, and an ordering dependency After= on the failing unit is set, this unit will not be started. Besides, with or without specifying After=, this unit will be stopped if one of the other units is explicitly stopped.
>
> Often, it is a better choice to use Wants= instead of Requires= in order to achieve a system that is more robust when dealing with failing services.

This should also be generally "safe" given we added `--containerd=/run/containerd/containerd.sock` to the flags we pass to `dockerd`.

Signed-off-by: Tianon Gravi <[email protected]>
@tianon tianon force-pushed the wants-containerd branch from 1e9d40a to 7aa6d8d Compare April 2, 2021 22:25
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thaJeztah commented Jul 12, 2021

Closing here, because the file was moved back to the moby repository.
I asked @aiordache to carry this (move to moby), thanks!

@thaJeztah thaJeztah closed this Jul 12, 2021
@aiordache aiordache mentioned this pull request Jul 12, 2021
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@tianon tianon deleted the wants-containerd branch July 12, 2021 21:57
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