On 11/06/2013 10:12 PM, Yehuda Sadeh wrote:
On Wed, Nov 6, 2013 at 11:33 AM, Wido den Hollander <wido@xxxxxxxx> wrote:
Hi,
I'm working on a RGW setup where I'm using Varnish[0] to cache objects, but
when doing so you run into the problem that a lot of (cached) requests will
not reach the RGW itself so the accounting of traffic isn't correct.
To overcome this I've been sending all the logs from Varnish to Logstash[1]
and into ElasticSearch and afterwards analyzing the logs in ElasticSearch to
find out how much traffic each bucket did.
This method works, but it isn't safe enough. Since I'm currently parsing the
"Host" header to find out which bucket it was, but this isn't always safe
since users can CNAME.
So I've been playing with the idea to add the "Rgwx-bucket" header to each
response which tells you which bucket the request was made to.
In Varnish I can catch this response header and send it to Logstash so I
have a safer method of which requests was done by which bucket.
I'm using Varnish, but you could do the same with nginx or any HTTP caching
proxy.
Would it be an idea to add this to RGW? I have it running on my system and
it works fine, but it's currently a bit hacky.
Yeah, I don't see why not. As long as it's configurable.
A config variable like "rgw expose bucket" could be false by default, but
when set to true RGW would send the response header with the bucket name.
How does this sound?
Sounds good, just need to see the code now ...
I did it way to complex until I looked at the code again today and came
up with a much simpler patch. It's in wip-rgw-expose-bucket now:
https://github.com/ceph/ceph/commit/f321471df2703ae706910757a133ab8a13803acb
The dump_bucket_from_state method was already there, but it's not used
anywhere. So I modified it a bit to have it honor the configuration boolean.
It writes the header "Bucket" although we might want to change it to
Rgwx-Bucket or X-Bucket where I prefer the last one.
The unwritten rule is that when you come up with custom header to prefix
it with "X-".
How does this sound?
Wido
P.S.: When this is all up and running I'm planning to make a cool
presentation about this for the next Ceph day.
Awesome!
Yehuda
--
Wido den Hollander
42on B.V.
Phone: +31 (0)20 700 9902
Skype: contact42on
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