[CentOS] How to start a script to complete configuration

Tue Nov 8 16:26:07 UTC 2016
Bernard Fay <bernard.fay at gmail.com>

It would be hard to use ansible, cfengine or whatever while there no IP
address on the new VM.....

On Tue, Nov 8, 2016 at 10:47 AM, <cpolish at surewest.net> wrote:

> On 2016-11-07 14:35, Bernard Fay wrote:
> > Hi,
> >
> > We have a virtual environment based on XenServer. In this environment I
> > defined a template for CentOS 7 servers.
> >
> > I would like to start a script a boot time to complete the configuration
> of
> > new VMs based on this template. How can I have a script started before
> any
> > login prompt to ask question to the user to complete the configuration
> such
> > as hostname, IP address, etc?
> Hi Bernard,
> My first impulse was "don't!", and that's probably the best
> advise.  A popular model is that the "firstboot" package takes
> care of this at the first user login, and *nix systems sort of
> depend on this "logged in users do stuff" model.
> Even better, use ansible, cfengine, chef, or puppet to automate
> the task of setting things up. This is the _best_ solution and
> you will eventually come back to it.
> But, the darker, cynical part of my brain, the part that says
> "what, you're cutting down on coffee?" part, said "sure you
> can". Here's how it _could_ be done.
>     Replace /sbin/init with a shell script that does what you want.
>     It will be the first userland process started, have the console
>     for I/O, and run as root. At completion, restore the original
>     /sbin/init and reboot. Leave no traces behind. Do not document
>     your awful hack, others will use your words against you.
> Best regards,
> --
> Chuck
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