Date: Thu, 17 Jan 2019 10:01:29 +0000 From: Matthew Seaman <matthew@FreeBSD.org> To: freebsd-questions@freebsd.org Subject: Re: iocage specific 12.0-RELEASE -> STABLE/12 Message-ID: <1f7b2afa-b48a-c9bd-baaa-32f01e8a6877@FreeBSD.org> In-Reply-To: <85740e12-819d-ba05-74b3-51f318f52d5c@pinyon.org> References: <85740e12-819d-ba05-74b3-51f318f52d5c@pinyon.org>
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On 16/01/2019 20:41, Russell L. Carter wrote:
> Greetings,
>
> While I wait on poudriere to build both firefox and chromium (32
> threads, and it will still take a while), so that I can install iocage
> and dive into this newfangled technology called "jails" ;-), I have a
> basic question.
>
> I had a flash in the brain (be nice, I'm a geezer and slow, it's only
> taken me 20 years to figure this out) and realized I might be able to
> use iocage jails to quickly spin up dev environments that are skeletal
> compared to my desktop environment and so can minimize package version
> collisions that happen when I try to port stuff to FreeBSD. So I want
> the FreeBSD version of the jail to match the commit of my stable/12
> host, including packages. However the iocage docs don't seem to
> mention this possibility. Is this something people do? I am guessing
> I can nfs mount my (different) build box's /usr/src, /usr/obj, and my
> package export directories into the jail, and use my source upgrade
> scripts and pkg upgrade as usual, correct? Are there any gotchas I
> should be aware of? Will the template mechanism make it easy to do
> the configuration just once, or is iocage expecting a point RELEASE,
> as suggested by the docs?
I do almost exactly this, except I use a bunch of home-grown ansible
code to create and configure jails. It's reasonably quick, but I don't
tend to spin up and discard jails that frequently.
I typically dedicate a ZFS heirarchy to each jail, and I install FreeBSD
from my build tree by setting DESTDIR:
/usr/src:# make installworld DESTDIR=/jails/somejail
etc. etc.
Then I have my own pkg repo behind a webserver for handling installed
software. Works pretty well.
Of course, that's the other big use of jails in the way that you
describe: poudriere will spin up some number of jails for build
environments, and these are very much use-and-discard jails.
> I got to this point pondering how to install gnutls with guile
> bindings, so that I can see if I can get guix working on stable/12.
Yes -- creating youself a clean environment to build and test without
needing to worry about conflicts with all sort of other software you
have installed is definitely a job for jails.
Cheers,
Matthew
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