Norbert,
Am 26.06.18 um 21:41 schrieb Norbert Hartl:
Am 26.06.2018 um 20:44 schrieb Andrei Stebakov <lisper...@gmail.com
<mailto:lisper...@gmail.com>>:
What would be an example for load balancer for Pharo images? Can we
run multiple images on the same server or for the sake of balancing
configuration we can only run one image per server?
There are a lot of possibilities. You can start multiple images on
different ports and use nginx with an upstream rule to load balance. I
would recommend using docker for spawning multiple images on a host.
Again with nginx as frontend load balancer. The point is that you can
have at least twice as muh inages running then you have CPU cores. And
of course a lot more.
the last time I checked nginx, the load balancing and sticky session
stuff was not available in the free edition. So I guess you either pay
for nginx (which I think is good) or you know some free 3d party addons...
I wonder what exactly the benefit of Docker is in that game? On our
servers we run 10 images on 4 cores with HT (8 virtual cores) and very
rareley have real performance problems. We use Glorp, so there is a lot
of SQL queriing going on for quite basic things already. So my guess
would be that your "2 images per core" are conservative and leave air
for even a third one, depending on all the factors already discussed here.
What's not to underestimate is all the stuff around monitoring and
restarting images when things go wrong, but that's another story...
Joachim
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