Re: Another Rust MirrorManager experiment

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On Mon, 5 Oct 2020 at 02:24, Adrian Reber <adrian@xxxxxxxx> wrote:
On Wed, Jul 01, 2020 at 09:16:05AM -0700, Kevin Fenzi wrote:
> On Tue, Jun 30, 2020 at 02:17:30PM +0200, Adrian Reber wrote:
> > On Mon, Jun 15, 2020 at 03:36:23PM -0700, Kevin Fenzi wrote:
> > > On Wed, Jun 10, 2020 at 11:09:49AM +0200, Adrian Reber wrote:
> > > >
> > > > Then I just have to wait a bit. No problem.
> > > >
> > > > > > Having the possibility to generate the mirrorlist input data in about a
> > > > > > minute would significantly reduce the load on the database server and
> > > > > > enable us to react much faster if broken protobuf data has been synced
> > > > > > to the mirrorlist servers on the proxies.
> > > > >
> > > > > Yeah, and I wonder if it would let us revisit the entire sequence from
> > > > > 'update push finished' to updated mirrorlist server.
> > >
> > > This would help us with the case of:
> > > - updates push/rawhide finishes, master mirror is updated.
> > > - openqa/other internal thing tries to get images or updates in that
> > >   change and gets a metalink with the old checksum so it can't get the
> > >   new stuff.
> > > - mm-backend01 generates and pushes out a new protobuf.
> > > >
> > > > Probably. As the new code will not run on the current RHEL 7 based
> > > > mm-backend01 would it make sense to run a short running service like
> > > > this on Fedora's OpenShift? We could also create a new read-only (SELECT
> > > > only) database account for this.
> > >
> > > We could, or as smooge suggests make a mm-backend02?
> > >
> > > But I guess now mm-backend02 just generates new proobuf files and copies
> > > them to mirrorlists? If thats all it's doing, perhaps we could indeed
> > > replace it with an openshift project.
> >
> > We need a system to run the tool and copy the data to all proxies.
> >
> > I would like to see a new MirrorManager database user who can only do
> > selects as that is all we need.
> >
> > Currently we copy the files via SSH to the proxies, if we continue doing
> > it that way, then we would also need the existing SSH key to copy the
> > data to the proxies.
> >
> > Easiest would probably be a small Fedora 32 based VM with 2GB of memory.
>
> I'm not sure f32 will work with 2gb memory anymore. I dont think it
> installs at any rate.
>
> I do like the idea of just making it an openshift pod. Perhaps this
> could even fit with pingous 'toddlers' setup. ie:

I tried to create a toddler, but that setup is too complicated for me.
Especially if something is not working it will be almost impossible for
me to debug it if it is running somewhere I cannot reach via SSH.

I just tried to build the generate-mirrorlist-cache on RHEL 7 (using
Rust from EPEL) and it works fine. Instead of 20 minutes it needs 30
seconds to generate the mirrorlist cache file on mm-backend01.

Although a RPM is available in Fedora I am not sure the RPM can be made
available in EPEL 7.

RPM Fusion is using the Rust based generate-mirrorlist-cache for some
months already and I do not see any problems with it.


We are not wanting to deploy new EL7 systems but would probably install an EL8 box for this. Does this change the need for moving to Fedora on it?

 
I would like to use this also for Fedora and a dedicated Fedora based VM
or building from source on RHEL 7 is both possible. Building from source
does not sound like something used in Fedora Infrastructure so setting
up a Fedora based VM would be necessary. Would that be possible?

                Adrian
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--
Stephen J Smoogen.

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