Remove rkt container runtime

[afbjorklund]

While the rkt component of kubernetes that was added in 1.3 and removed in 1.9 is gone,
there is a CRI replacement called rktlet. But even that is also stuck in the 1.8 - 1.11 era ?

So it seems like there is not too much development going on with rkt, and nobody using it.
Users looking for a supported alternative container runtime would be better off with cri-o...

Therefore the suggestion is to remove it, for 1.0:

master...afbjorklund:rkt-remove

I made a small effort to update it, in case I am wrong:

master...afbjorklund:rktlet

[afbjorklund]

Reference #168

I managed to install rkt in the initrd image (grows from to 37MB to 75MB, do you foresee a problem with this increase?

And #571 (for ISO)

I managed to build a ~57MB big bootable systemd-as-pid1-based ISO image having rkt included using buildroot.

Ping @tstromberg

[tstromberg]

Let's nuke rkt.

[tstromberg]

Related: #3920

[tstromberg]

One quirk: the toolbox binary currently references on rkt. I'm not sure yet if it's truly required, or if there is a viable rkt-less workaround.

[afbjorklund]

@tstromberg : yeah, I saw that. Maybe upstream has some kind of workaround for it, will peek around.

https://github.com/coreos/toolbox

There are currently two scripts that live within this repository:

toolbox: designed for Container Linux, uses rkt and systemd-nspawn
rhcos-toolbox: designed for Red Hat CoreOS, uses podman

[afbjorklund]

Deleted the toolbox for now, seems like running containers with podman isn't working at the moment.

                         _             _            
            _         _ ( )           ( )           
  ___ ___  (_)  ___  (_)| |/')  _   _ | |_      __  
/' _ ` _ `\| |/' _ `\| || , <  ( ) ( )| '_`\  /'__`\
| ( ) ( ) || || ( ) || || |\`\ | (_) || |_) )(  ___/
(_) (_) (_)(_)(_) (_)(_)(_) (_)`\___/'(_,__/'`\____)
$ sudo podman pull busybox
Trying to pull docker.io/busybox:latest...Getting image source signatures
Copying blob 697743189b6d: 738.18 KiB / 738.18 KiB [========================] 1s
Copying config d8233ab899d4: 1.46 KiB / 1.46 KiB [==========================] 0s
Writing manifest to image destination
Storing signatures
d8233ab899d419c58cf3634c0df54ff5d8acc28f8173f09c21df4a07229e1205
$ sudo podman run -it busybox
error configuring network namespace for container b731699b47263152e29888a9b91d671346548c0d059ec056a8aa8ce1797077d6: Missing CNI default network

Probably needs some CNI configuration.

[afbjorklund]

Found a way to use podman for the extraction, but still use systemd-nspawn for running.

[tstromberg]

Can this be closed?

[afbjorklund]

Closed in 1.0.