Disabling IPv6

[matteoiacovitti]

Hello,

Is there a way to disable IPv6 at bootup? I have tried using /etc/sysctl.d conf files and NetworkManager connections files but none seem to work.

I saw that you could modify the GRUB to include ipv6.disable=1 but I'm not sure if you can do that with the ignition.

What would be the appropriate and most efficient method to achieve this?

[jlebon]

Is there a way to disable IPv6 at bootup? I have tried using /etc/sysctl.d conf files and NetworkManager connections files but none seem to work.

That should work normally. What you're probably hitting up against is that Ignition itself needs networking on first boot and by default will try to DHCP over IPv6. We're working on dropping that requirement when possible (#443) so that you can boot without starting networking at all until Ignition has written out files.

What platform are you on?

I saw that you could modify the GRUB to include ipv6.disable=1 but I'm not sure if you can do that with the ignition.

Not yet, but it's on the roadmap. :) The current way to do this for now is a systemd service with ConditionFirstBoot=true which runs rpm-ostree kargs --reboot ....

[cgwalters]

You can also use the Live ISO.

[matteoiacovitti]

You can also use the Live ISO.

What do you mean?

[cgwalters]

A lot of related discussion in

openshift/enhancements#210
coreos/ignition#979
openshift/enhancements#291

We still need to distill some of the core bits down into https://docs.fedoraproject.org/en-US/fedora-coreos/bare-metal/#_installing_from_live_iso but basically you use coreos-installer iso embed to write an Ignition config which runs coreos-installer which can in turn configure networking how you want via propagating networking.