Description

Flatcar Container Linux by Kinvolk alpha (2605.0.0):

$ sudo ipset list
ipset v6.20.1: Kernel support protocol versions 6-7 while userspace supports protocol versions 6-6
Kernel and userspace incompatible: settype by userspace. with revision 1578235808 not supported 

Impact

I cannot easily inspect ipsets.

Environment and steps to reproduce

1. Set-up: Lokomotive cluster with calico having configured ipset rules
2. Task: list rules fom command line
3. Action(s): sudo ipset list
4. Error: see above

Expected behavior
ipset list lists the ipsets, e.g. from Calico

Additional information

Workaround:

docker run --rm -ti --privileged --net=host ubuntu
apt-get update &>/dev/null && apt-get install -y ipset &>/dev/null && ipset list

Related issue: https://bugs.launchpad.net/ubuntu/+source/firewalld/+bug/1821596

Note: this issue does not affect iptables: I can use iptables without problems.