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Thanks - yeah jewel is old 🙂 But i meant to say nautilus and not luminous.
The first option probably wont work for me. Since both sides are active and the application1 needs to write in both places as
http://application1.something.com.
The 2nd one in theory should work. I'm using haproxy and it does have an option to rewrite host headers. I can also replace it with nginx since i
think it'll handle this kind of thing better. In such a situation, I'd set one site's radosgw to application1-master and the 2nd one to
application1-slave. The reverse proxy will then rewrite application1 to application1-master or application1-slave depending on the site.
Thanks
From: Ed Fisher <ed@xxxxxxxxxxx>
Sent: Wednesday, October 9, 2019 11:13 AM To: Melzer Pinto <Melzer.Pinto@xxxxxxxxxxxx> Cc: ceph-users@xxxxxxxxxxxxxx <ceph-users@xxxxxxxxxxxxxx> Subject: Re: [ceph-users] Ceph multi site outage question Boy, Jewel is pretty old. Even Luminous is getting up there. There have been a lot of multisite improvements in Mimic and now Nautilus, so you might want to consider upgrading all the
way to 14.2.4.
Anyway, the way we solve this is by giving each zone a different name (eg application1a/application1b), and then having a virtual IP for application1. We then move the virtual IP around whichever zone we want to have accepting traffic for that
zonegroup. In our case we're advertising the virtual IP on all of the radosgw instances using bgp and then letting our routers do per-stream ECMP to load balance the traffic. Each RGW in each cluster checks the realm's period every few seconds and decides
to announce/withdraw the IP based on whether that rgw's zone is the master zone for the zonegroup (plus whether the rgw instance is healthy, etc).
We have both application1.example.com and application1a/application1b.example.com as hostnames in the zonegroup config, but just
application1.example.com for the endpoint. I'm not sure what the equivalent settings are on Jewel's multisite, if any. If you're routing radosgw traffic through a reverse proxy or load balancer you can
also rewrite the host header on the fly.
Hope this helps,
Ed
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