Re: RadosGW and DNS Round-Robin

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Hi,

Am 04.09.20 um 18:20 schrieb DHilsbos@xxxxxxxxxxxxxx:
All;

We've been running RadosGW on our nautilus cluster for a while, and we're going to be adding iSCSI capabilities to our cluster, via 2 additional servers.

I intend to also run RadosGW on these servers.  That begs the question of how to "load balance" these servers.  I don't believe that we need true load balancing (i.e. through a dedicated proxy), and I'd rather not add the complexity and single point of failure.

The question then is:  Does RadosGW play nice with round-robin DNS?  The real question here is whether RadosGW maintains internal client state locally between connections.  I would expect it's safe, given that it is HTTP, but I'd prefer to verify.

I am also very interested in the answer — we are operating 3 RGW instances since over a year with DNS load balancing, but never asked this question,
and did not observe any issues. It would of course be nice to see this confirmed ;-).

However, most of our clients are using systemd-resolved for DNS caching, as most Linux distributions do nowadays.
This breaks load-balancing of each client (i.e. each client stays with a chosen address after the initial DNS query for the cache period)[0],
so it might be that if there is an issue, this is hidden by the way most of our client systems behave.

Cheers,
	Oliver

[0] https://github.com/systemd/systemd/issues/16297



Thank you,

Dominic L. Hilsbos, MBA
Director - Information Technology
Perform Air International Inc.
DHilsbos@xxxxxxxxxxxxxx
www.PerformAir.com

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