The deprecated-key-path option is no longer handled, but it doesn't cause
problems because the key is explicitly ignored. It was completely removed in
Docker 19.03.0 [1].
As such, the option and the pre-start script to fix the corrupted key.json can
be removed now, as it has no effect, only printing confusing message when
Docker service fails to start.
[1] 98fc09128b
Prefer the containerd snapshotter by using it by default for new installs and
when no Docker data is present (e.g. after datadisk wipe). The snapshotter is
enabled by a dockerd flag which is set when a flag file is present in the data
partition. This flag file can be used also to opt-in for this snapshotter on
legacy installs (high level API through OS Agent and Supervisor TBD), to
migrate to the containerd snapshotter this file can be simply created manually.
Testing shown no major problems when migrating, the old overlay2 folder can be
(and should be - to avoid situations where the data disk might run out of
space) deleted before the docker.service is started in the docker-prepare
script.
Note that there's no offline migration path, OS needs to be connected to the
internet to re-download the images when migrating. This could be theoretically
possible through docker image save/load functions but guarding for enough of
space and other edge cases would be probably too complex to justify it.
Refs #4252
Refs #4253 - easier opt-in method is still needed
Closes#4254 - migration is handled seamlessly by Docker
The ip6tables configuration is now enabled by default since Docker 27
(see https://github.com/moby/moby/pull/47747). The experimental config
got introduced with the ip6tables flag in #2051. There is no other
experimental feature used from what I am aware of, so lets remove the
experimental flag as well.
The image name is stored in a separate field IMAGE_NAME as well. This
allows to use the container name (e.g. `hassio_supervisor`) to get logs
of all Supervisors independent of the image name (which differs for
every version).
This is more readable than passing arguments to the daemon directly. It
also shortens the ExecStart command significantly, which is stored in
every log entry in systemd-journald.
