clewis: 1. i do not understand the use case of multiple regions and multiple zones and multiple rgw. in actual use(upload, download) , users have dealings with rgw directly, in this process , what do regions and zones do? 2. it is radosgw-agent to sync data and metadata. if data synchronization is finished right after metadata is synced , or conversely? if not, how is it when user access a file throught another region/zone? 3. during using multiple regions/zones,rgw , do they have any relations with cdn(Content Delivery Network)? or how to use multiple regions/zones/rgws with cdn? thanks, looking forward to your reply.
在 2014-10-28 02:29:03，"Craig Lewis" <cle...@centraldesktop.com> 写道： On Sun, Oct 26, 2014 at 9:08 AM, yuelongguang <fasts...@163.com> wrote: hi, 1. if one radosgw daemon corresponds to one zone ? the rate is 1:1 Not necessarily. You need at least one radosgw daemon per zone, but you can have more. I have a two small clusters. The primary has 5 nodes, and the secondary has 4 nodes. Every node in the clusters run an apache and radosgw. It's possible (and confusing) to run multiple radosgw daemons on a single node for different clusters. You can either use Apache VHosts, or have CivetWeb listening on different ports. I won't recommend this though, as it introduces a common failure mode to both zones. 2. it seems that we can deploy any number of rgw in a gingle ceph cluster, those rgw can work separately or cooperate by using radosgw-agent to sync data and metadata, am i right? You can deploy as many zones as you want in a single cluster. Each zone needs a set of pools and a radosgw daemon. They can be completely independant, or have a master-slave replication setup using radosgw-agent. Keep in mind that radosgw-agent is not bi-directional replication, and the secondary zone is read-only. 3. do you know how to set up load balance for rgws? is nginx a good choose, how to let nginx work with rgw? Any Load Balancer should work, since the protocol is just HTTP/HTTPS. Some people on the list had issues with nginx. Search the list archive for radosgw and tengine. I'm using HAProxy, and it's working for me. I have a slight issue in my secondary cluster, with locking during replication. I believe I need to enable some kind of stickiness, but I haven't gotten around to investigating. In the mean time, I've configured that cluster with a single node in the active backend, and the other nodes in a backup backend. It's not a setup that can work for everybody, but it meets my needs until I fix the real issue.
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