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Re: Switching backends based on a cookie

January 29, 2010 05:58AM
saltyflorida wrote:
> saltyflorida Wrote:
> -------------------------------------------------------
>
>> Eugaia Wrote:
>> --------------------------------------------------
>> -----
>>
>>> saltyflorida wrote:
>>>
>>>> I forgot to mention that I am using caching
>>>>
>> with
>>
>>> the HTTP Proxy module and that I only want to
>>> cache responses from the production servers.
>>>
>> When
>>
>>> I have the cookie set to "testing" or
>>>
>> "staging",
>>
>>> I'd like to bypass the cache and talk directly
>>>
>> to
>>
>>> the backend. Does this sound feasible?
>>>
>>>>
>>>>
>>> Sure. Do a rewrite using your $backend
>>>
>> variable
>>
>>> under the 'location /'
>>> block to one of three other blocks, which have
>>>
>> the
>>
>>> different definitions
>>> of your proxy_pass, proxy_cache_valid...
>>>
>>> e.g.
>>>
>>> map $cookie_ $backend {
>>>
>>> default production;
>>> test test;
>>> ...
>>> }
>>>
>>> location / {
>>> rewrite ^(.*)$ /$backend/$1;
>>> }
>>>
>>> location /production/ {
>>> proxy_pass
>>> http://backend_production;
>>> proxy_cache_valid ...
>>> }
>>>
>>> location /test/ {
>>> proxy_pass
>>> # no proxy_cache_valid
>>> ...
>>> }
>>>
>>> Note, you'll need some way to catch the case of
>>>
>> no
>>
>>> cookie variable, so
>>> it's unwise to put $cookie_ directly in the
>>> rewrite result (you'll
>>> get an infinite loop on such results).
>>>
>>> Marcus.
>>>
>>> _______________________________________________
>>> nginx mailing list
>>> nginx@nginx.org
>>> http://nginx.org/mailman/listinfo/nginx
>>>
>> Marcus,
>> Thank you for your help. I had wondered if I could
>> use a rewrite, but I don't
>> understand how this works. I tried to implement
>> your suggestion, but I am
>> being redirected to /testing/ or /production/.
>> These show up as part of the
>> URL in the browser. Also, trying to visit pages
>> other than the root return a
>> 404 error. Here is my configuration. Can you point
>> out what I'm doing wrong?
>>
>> http {
>> upstream backend_testing {
>> ip_hash;
>> server ...
>> }
>> upstream backend_staging {
>> ip_hash;
>> server ...
>> }
>> upstream backend_production {
>> ip_hash;
>> server ...
>> }
>> proxy_cache_path /mnt/nginx_cache levels=1:2
>> keys_zone=one:100m
>> inactive=7d max_size=10g;
>> proxy_temp_path /var/www/nginx_temp;
>>
>> map $cookie_uslnn_env $backend {
>> default http://backend_production;
>> testing http://backend_testing;
>> staging http://backend_staging;
>> production http://backend_production;
>> }
>>
>> server {
>> location / {
>> rewrite ^(.*)$ /$backend/$1;
>> }
>> location /testing/ {
>> proxy_pass http://backend_testing;
>> }
>> location /staging/ {
>> proxy_pass http://backend_staging;
>> }
>> location /production/ {
>> proxy_pass http://backend_production;
>> proxy_cache one;
>> proxy_cache_key $my_cache_key;
>> proxy_cache_valid 200 302 304 10m;
>> proxy_cache_valid 301 1h;
>> proxy_cache_valid any 1m;
>> proxy_cache_use_stale updating error
>> timeout invalid_header http_500 http_502 http_503
>> http_504;
>> }
>> location /wp-admin {
>> proxy_pass http://backend_production;
>> proxy_read_timeout 300;
>> }
>> }
>> }
>>
>> Thanks,
>> Eliot
>>
>
> Correction:
> The configuration I tried looks like this:
>
> http {
> upstream backend_testing {
> ip_hash;
> server ...
> }
> upstream backend_staging {
> ip_hash;
> server ...
> }
> upstream backend_production {
> ip_hash;
> server ...
> }
> proxy_cache_path /mnt/nginx_cache levels=1:2
> keys_zone=one:100m
> inactive=7d max_size=10g;
> proxy_temp_path /var/www/nginx_temp;
>
> map $cookie_uslnn_env $backend {
> default production;
> production production;
> testing testing;
> staging staging;
> }
>
> server {
> location / {
> rewrite ^(.*)$ /$backend/$1;
> }
> location /testing/ {
> proxy_pass http://backend_testing;
> }
> location /staging/ {
> proxy_pass http://backend_staging;
> }
> location /production/ {
> proxy_pass http://backend_production;
> proxy_cache one;
> proxy_cache_key $my_cache_key;
> proxy_cache_valid 200 302 304 10m;
> proxy_cache_valid 301 1h;
> proxy_cache_valid any 1m;
> proxy_cache_use_stale updating error timeout invalid_header http_500 http_502 http_503 http_504;
> }
> location /wp-admin {
> proxy_pass http://backend_production;
> proxy_read_timeout 300;
> }
> }
> }
>
Sorry, my fault. That should have read 'proxy_pass
htttp://backend_production/;'. The final slash 'deletes' the first part
of the location that's passed.

Note that you will want to add the slash for the /production/,
/testing/... blocks, but not for the /wp-admin block.

Marcus.


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Subject Author Posted

Switching backends based on a cookie

saltyflorida January 28, 2010 06:43PM

Re: Switching backends based on a cookie

Eugaia January 28, 2010 07:06PM

Re: Switching backends based on a cookie

merlin corey January 28, 2010 07:28PM

Re: Switching backends based on a cookie

merlin corey January 28, 2010 07:30PM

Re: Switching backends based on a cookie

saltyflorida January 28, 2010 09:01PM

Re: Switching backends based on a cookie

Eugaia January 28, 2010 07:54PM

Re: Switching backends based on a cookie

merlin corey January 29, 2010 12:44PM

Re: Switching backends based on a cookie

saltyflorida January 28, 2010 07:57PM

Re: Switching backends based on a cookie

Eugaia January 28, 2010 09:54PM

Re: Switching backends based on a cookie

saltyflorida January 29, 2010 02:05AM

Re: Switching backends based on a cookie

saltyflorida January 29, 2010 02:13AM

Re: Switching backends based on a cookie

Eugaia January 29, 2010 05:58AM

Re: Switching backends based on a cookie

saltyflorida February 03, 2010 12:31AM

Re: Switching backends based on a cookie

saltyflorida January 28, 2010 08:51PM

Re: Switching backends based on a cookie

Piotr Sikora January 28, 2010 09:10PM

Re: Switching backends based on a cookie

saltyflorida January 28, 2010 09:18PM

Re: Switching backends based on a cookie

Piotr Sikora January 28, 2010 09:20PM

Re: Switching backends based on a cookie

Laurence Rowe January 29, 2010 02:24PM

Re: Switching backends based on a cookie

Eugaia January 29, 2010 06:04PM

Re: Switching backends based on a cookie

Laurence Rowe January 30, 2010 01:50PM

Re: Switching backends based on a cookie

Eugaia January 30, 2010 07:04PM



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