Going a bit off track from upgrades here. In a cluster environment with
debian do you spend a fair bit of time compiling anything from source?
On 2016-05-20 12:08, Tim Cutts wrote:
> In practice, at Sanger we haven't made very heavy use of the ability of
> Debian to upgrade from release to release. We use FAI to install the boxes,
> so frankly it's faster and less hassle to just reinstall them from scratch
> when the next release comes out.
>
> For some complicated bespoke systems, I have done the manual upgrade, and
> I've even done that across debian-derived distros.
>
> Officially, you're not supposed to be able to use apt to upgrade a system
> from Debian to Ubuntu, for example, but I have done it in the past - I worked
> out a documented procedure for doing a dist-upgrade from Debian Lenny to
> Ubuntu Lucid, for example. At one point, you do have to force downgrade
> packages which are newer in the original os than they are in the target,
> which led to the following one liner of which I am perversely proud:
>
> aptitude search -F '%p' ~i | xargs -n 1 apt-cache policy | sed -n -e '
> /^[a-z0-9.-]*:$/{h;d;}
> /\*\*\*/{
> n
> /^ *500 /d
> /^ *100 /{
> n
> /^ *[^ ]/{x;s/:/\/lucid/p;x;}
> }
> /^[a-z0-9.-]*:$/{h;d;}
> }
> ' | xargs apt-get -y --force-yes install
>
> Gotta love sed for resulting in completely impenetrable commands. I did try
> to do it in a more readable way using the python APT bindings, but that was
> actually much harder.
>
> Tim
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