As someone who has fought with using/modifying/QA'ing unstable FreeIPA installers from the nightly repos, I wholeheartedly second this motion!
Make sure the oVirt guys get wind of this idea also! ;) PS: semi-related note — Can FreeIPA be made to consume the CSR that results from the ovirt-host-deploy hoster node installer? On Thursday, November 14, 2013, Petr Spacek wrote: > Hello, > > there is an interesting idea that installers should be idempotent. I have > heard it on LinuxAlt conference 2013 in Brno, Czech republic and it is > implemented e.g. by project Chef [1] and it is used e.g. by OpenStack > installer [2] (used e.g. by SUSE). > > What Wikipedia says about idempotence [3]: > "Idempotence is the property of certain operations in mathematics and > computer science, that can be applied multiple times without changing the > result beyond the initial application." > > ... And that is it :-) > > In reality, it means that you can re-run OpenStack installer on the same > machine/set of machines (with the same configuration, of course!) and it > will re-do everything again. You can re-run installer again and again > without any harm! > > This solves case where something went wrong during the installation, the > installation was aborted and the machine was left in some inconsistent > state. Think about e.g. network failure during installation, improper > configuration which prevented installation from finishing (crap in DNS), > some intermittent and mysterious errors in Dogtag installer and so on. > > It does mean that you don't need to recycle whole machine if something > went wrong during installation ... > > As a result, you don't need to have separate system for installation and > for upgrade. > > (Obviously, it means installation steps has to be 'declarative' instead of > 'imperative'.) > > > I think that this is very interesting idea and it would be interesting to > write new code with idempotence in mind. Eventually, we could end with > fully idempotent installer :-) > > [1] http://www.opscode.com/chef/ > [2] http://www.slideshare.net/mattray/deploying-openstack-with-chef > [3] http://en.wikipedia.org/wiki/Idempotence > > -- > Petr^2 Spacek > > _______________________________________________ > Freeipa-devel mailing list > [email protected] > https://www.redhat.com/mailman/listinfo/freeipa-devel >
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