All,
I am having a heck of a time with getting mod_cache to work properly.
I am trying to have it cache a mixture of static files and proxy
generated content.
I'd greatly appreciate any suggestions.
First with mod_mem_cache I am seeing entries in my logs like the
following for a URL content generated by a proxy-balancer backend :
211 [Wed Aug 22 10:45:58 2007] [debug] mod_proxy_http.c(1662): proxy:
HTTP: serving URL http://127.0.0.1:9000/api/schedule
212 [Wed Aug 22 10:45:58 2007] [debug] proxy_util.c(1798): proxy:
HTTP: has acquired connection for (127.0.0.1)
213 [Wed Aug 22 10:45:58 2007] [debug] proxy_util.c(1858): proxy:
connecting http://127.0.0.1:9000/api/schedule to 127.0.0.1:9000
214 [Wed Aug 22 10:45:58 2007] [debug] proxy_util.c(1951): proxy:
connected /api/schedule to 127.0.0.1:9000
215 [Wed Aug 22 10:45:58 2007] [debug] proxy_util.c(2045): proxy:
HTTP: fam 2 socket created to connect to 127.0.0.1
216 [Wed Aug 22 10:45:58 2007] [debug] proxy_util.c(2141): proxy:
HTTP: connection complete to 127.0.0.1:9000 (127.0.0.1)
217 [Wed Aug 22 10:45:58 2007] [debug] mod_proxy_http.c(1448): proxy:
start body send
218 [Wed Aug 22 10:45:58 2007] [debug] mod_headers.c(612): headers:
ap_headers_output_filter()
219 [Wed Aug 22 10:45:58 2007] [debug] mod_cache.c(602): cache:
Caching url: /api/schedule
220 [Wed Aug 22 10:45:58 2007] [debug] mod_cache.c(608): cache:
Removing CACHE_REMOVE_URL filter.
221 [Wed Aug 22 10:45:58 2007] [info] mem_cache: Cached url:
http://sitev2:80/api/schedule?
But my backend is seeing a request to generate the info on every
subsequent request. No Age: is passed to the browser either, and the
Server: is not Apache but rather the backend.
Secondly my mod_disk_cache is not storing pages for the amount of time
specified. I can see that perhaps some requests get sent to the
backend and before it can reply a second one comes in.
[Mon Aug 20 15:38:58 2007] [debug] cache_storage.c(272): Cached
response for / isn't fresh. Adding/replacing conditional request
headers.
[Mon Aug 20 15:39:00 2007] [debug] cache_storage.c(272): Cached
response for / isn't fresh. Adding/replacing conditional request
headers.
[Mon Aug 20 15:39:06 2007] [debug] cache_storage.c(272): Cached
response for / isn't fresh. Adding/replacing conditional request
headers.
[Mon Aug 20 15:39:23 2007] [debug] cache_storage.c(272): Cached
response for / isn't fresh. Adding/replacing conditional request
headers.
[Mon Aug 20 15:39:23 2007] [debug] cache_storage.c(272): Cached
response for / isn't fresh. Adding/replacing conditional request
headers.
[Mon Aug 20 15:39:24 2007] [debug] cache_storage.c(272): Cached
response for / isn't fresh. Adding/replacing conditional request
headers.
[Mon Aug 20 15:40:59 2007] [debug] cache_storage.c(272): Cached
response for / isn't fresh. Adding/replacing conditional request
headers.
[Mon Aug 20 15:41:48 2007] [debug] cache_storage.c(272): Cached
response for / isn't fresh. Adding/replacing conditional request
headers.
[Mon Aug 20 15:41:51 2007] [debug] cache_storage.c(272): Cached
response for / isn't fresh. Adding/replacing conditional request
headers.
[Mon Aug 20 15:41:52 2007] [debug] cache_storage.c(272): Cached
response for / isn't fresh. Adding/replacing conditional request
headers.
[Mon Aug 20 15:41:55 2007] [debug] cache_storage.c(272): Cached
response for / isn't fresh. Adding/replacing conditional request
headers.
#My configuration for my virtual host.
<IfModule mod_cache.c>
UseCanonicalName On
CacheIgnoreNoLastMod On
CacheIgnoreCacheControl On
CacheIgnoreHeaders Set-Cookie
CacheDefaultExpire 600
<IfModule mod_mem_cache.c>
CacheEnable mem /xml/
CacheEnable mem /api/
CacheEnable mem /rss/
MCacheMaxObjectSize 300000
MCacheSize 50000
</IfModule>
<IfModule mod_disk_cache.c>
CacheRoot /var/cache/httpd
CacheEnable disk /
CacheDirLevels 2
CacheDirLength 1
</IfModule>
</IfModule>
ExpiresDefault A86400
ExpiresByType image/x-icon A2592000
ExpiresByType application/xml A33
ExpiresByType text/xml A34
ExpiresByType text/html A39
ExpiresByType text/javascript A644800
ExpiresByType text/css A644800
ExpiresByType image/gif A604800
ExpiresByType image/png A604800
ExpiresByType image/jpeg A604800
ExpiresByType application/x-shockwave-flash A604800
ExpiresByType video/x-flv A604800
ExpiresByType application/pdf A604800
#Remove the Cache-Control coming from the backend
Header unset Cache-Control
<Proxy balancer://sitev2_cluster>
BalancerMember http://127.0.0.1:9000
</Proxy>
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