services should be back up - power outage

[Chirana Gheorghita Eugeniu Theodor]

Peacemaker and corosync?


On Thu, Oct 1, 2020 at 10:16 AM Jeroen Massar via subsurface <
subsurface at subsurface-divelog.org> wrote:

> On 20201001, at 07:00, Dirk Hohndel via subsurface <
> subsurface at subsurface-divelog.org> wrote:
> >
> >> On Sep 30, 2020, at 8:36 PM, Chirana Gheorghita Eugeniu Theodor <
> office at adaptcom.ro> wrote:
> >>
> >> What would be needed to have a secondary server in a new location? what
> setup are we talking about?
> >
> > It’s actually rather difficult to load-balance this without adding a ton
> (and I mean a TON) of infrastructure that I’m not really interested in
> maintaining. I have spent a bit of time trying to figure out if there’s a
> way to cheat and not need a storage engine, but if there is, I haven’t
> found any pointers on how to do this.
>
> Do you have a mini description of the server side setup (code/fs/db)? Is
> it Git based?
>
> > I do have a way to do a hot standby, I may have deleted that hot standby
> from AWS because I was ticked off about the money they charged me for it -
> when it never once got used. And this still had the problem with figuring
> out how to implement the traffic distribution without incurring even more
> AWS fees.
>
> Active/standy should be fine for this purpose.
>
> Just rsync/git-pull the stuff over, so that if the primary dies, that you
> can switch over manually.
>
> Split-brain is the biggest issue in these kind of setups.
>
>
> The fun detail is that basement servers are typically the most stable
> (except for the connectivity possibly), and if something breaks one can
> actually walk to that "datacenter" easily, often much quicker to fix too if
> one needs spare parts etc. And with cheap-ish power, and free cooling /
> colder environment (we got first snow at 1200m) it is price-wise cheaper
> than a colo'd box.
>
> That said though, I use private colo'd servers (because of home
> connectivity not always being superb and could not get more than slow cable
> speeds and upload at home still is slow), if you need a secondary/third VM
> somewhere on a static IP (colo'd), don't hesitate to yell, more than happy
> to donate one for Subsurface (and I am sure others here can do the same; it
> is always funny the names you see on this list ;) ).
>
> Also, the expertise + time for doing a full active-active version if one
> wants to go in that direction, I have setup my share of those systems.
>
> But as you say,.... if it is 99.8% running, meh, is not life critical.
> Long live git.
>
> >> On Thu, Oct 1, 2020, 01:31 Rick Walsh via subsurface <
> subsurface at subsurface-divelog.org> wrote:
> >> To conserve money, much of the infrastructure is actually running in my
> basement.
> >> All of course on a UPS, with redundant internet connection, etc.
> >>
> >> Power went out today. And my UPS failed.
> >> I've always wondered what that U in UPS actually stands for.
> >
> > Oh, speaking of saving money… yeah, I bought a new UPS. Oh, and one of
> my little NUCs needed a bigger NVMe M.2 SSD.
> > So maybe I really don’t understand how to save money :-)
>
> Sounds like a still cheap rabbit hole to me ;)
>
> Greets,
>  Jeroen
>   (who is awaiting travel to become easier again so I can pack some bags
> and go see some big fish...)
>
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>


-- 
________________________________________
Cu stima/Best regards/Mit freundlichen Grüßen,

Chirana-Gheorghita Eugeniu-Theodor
Bucharest, Romania

e-mail : office at adaptcom.ro
mobile: 0743 698721
            0747 447675
SSI diver ID: 1118289
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