imeoer

> Can we add a usage in `docs/nydusify.md` for the `nydusify optimize` command? Hi @Maxing1997, plz help move forward with merging this PR if you have time. :)

It make sense, perhaps we can provide these info by other method?

Indeed, should avoid output info level logs within a lib, but it's hard to change the log level to debug issue in production, maybe we can store pub capable in...

Hardcoding the release version into the yaml before release is easy to overlook. Can we modify the version in the yaml on releasing? so that users only need to wget...

@zzzyuan0 Did you changed the containerd root directory to `/container_data/containerd` ?

@zzzyuan0 It makes sense, so we need to improve the logic about recovering daemon on the boot stage of snapshotter, ignoring the failed daemons here: 

others LGTM, thanks!