[CoreOS] Re: How to make ignition think it's the first boot?

[Jonathan Lebon]

On Tue, Jun 4, 2019 at 8:13 AM QingFeng Hao <haoqf(a)linux.vnet.ibm.com&gt; wrote:
>  Hi,
>  According to the link https://coreos.com/ignition/docs/latest/boot-process.html, ignition
> only takes effect at the first boot.
>  But we want to make it effect later if we missed something in the first boot, or we want
> to debug ignition. 
If you missed something, it's safer to just fix your Ignition config
and reprovision the machine from scratch. Ignition has non-idempotent
bits in it, for example the `append` and `overwrite` keys.

That said, if you really do want to have Ignition rerun for debugging
purposes, in FCOS/RHCOS you can use `ignition.firstboot=1`. This gets
picked up here:
https://github.com/coreos/ignition-dracut/blob/df88988f2f0791ca9ea1e14298...

The docs at https://coreos.com/ are generally for Container Linux,
though some things do apply to RHCOS/FCOS (e.g. the Ignition v2.2
specification for RHCOS). I don't think we have this specific change
documented somewhere else yet.


>
> Thanks a lot!
>
> --
> Regards
> QingFeng Hao
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