Oggi mentre seguivo il mio n-esimo lavoro sono stato allarmato dal Jamo e poi dal Corra su un problema che affligge le immagini sul sito.

Appena rientrato in casa ho dato un’occhiata: il problema si è palesato immediatamente:

arancia:~/tmp fabio$ wget -S http://www.inter.it/img/headers/ita/it_header_sky-materazi.jpg
--19:55:54-- http://www.inter.it/img/headers/ita/it_header_sky-materazi.jpg
=> `it_header_sky-materazi.jpg'
Resolving www.inter.it... 217.169.113.132
Connecting to www.inter.it[217.169.113.132]:80... connected.
HTTP request sent, awaiting response...
1 HTTP/1.1 200 OK
2 Date: Wed, 19 Jan 2005 18:56:05 GMT
3 Server: Apache/2.0.52 (Debian GNU/Linux)
4 Cache-Control: max-age=600, max-age=600, max-age=600, max-age=600, max-age=600, max-age=600, max-age=600, max-age=600, max-age=600, max-age=600, max-age=600, max-age=600, max-age=600, max-age=600, max-age=600, max-age=600, max-age=600, max-age=600, max-age=600, max-age=600, max-age=600, max-age=600, max-age=600, max-age=600, max-age=600, max-age=600, max-age=600, max-age=600, max-age=600, max-age=600, max-age=600, max-age=600, max-age=600
5 Expires: Wed, 19 Jan 2005 16:10:12 GMT, Wed, 19 Jan 2005 16:20:02 GMT, Wed, 19 Jan 2005 16:20:18 GMT, Wed, 19 Jan 2005 16:31:09 GMT, Wed, 19 Jan 2005 16:31:56 GMT, Wed, 19 Jan 2005 16:42:07 GMT, Wed, 19 Jan 2005 16:42:13 GMT, Wed, 19 Jan 2005 16:52:22 GMT, Wed, 19 Jan 2005 16:52:22 GMT, Wed, 19 Jan 2005 17:03:15 GMT, Wed, 19 Jan 2005 17:04:57 GMT, Wed, 19 Jan 2005 17:15:14 GMT, Wed, 19 Jan 2005 17:15:15 GMT, Wed, 19 Jan 2005 17:25:19 GMT, Wed, 19 Jan 2005 17:25:29 GMT, Wed, 19 Jan 2005 17:36:09 GMT, Wed, 19 Jan 2005 17:36:27 GMT, Wed, 19 Jan 2005 17:46:27 GMT, Wed, 19 Jan 2005 17:46:32 GMT, Wed, 19 Jan 2005 17:56:37 GMT, Wed, 19 Jan 2005 17:57:37 GMT, Wed, 19 Jan 2005 18:07:38 GMT, Wed, 19 Jan 2005 18:07:41 GMT, Wed, 19 Jan 2005 18:17:41 GMT, Wed, 19 Jan 2005 18:17:57 GMT, Wed, 19 Jan 2005 18:28:06 GMT, Wed, 19 Jan 2005 18:28:34 GMT, Wed, 19 Jan 2005 18:38:34 GMT, Wed, 19 Jan 2005 18:38:38 GMT, Wed, 19 Jan 2005 18:48:40 GMT, Wed, 19 Jan 2005 18:48:49 GMT, Wed, 19 Jan 2005 19:01:55 GMT, Wed, 19 Jan 2005 19:02:17 GMT
6 ETag: "132f2a-8ade-41a49014", "132f2a-8ade-41a49014", "132f2a-8ade-41a49014", "132f2a-8ade-41a49014", "132f2a-8ade-41a49014", "132f2a-8ade-41a49014", "132f2a-8ade-41a49014", "132f2a-8ade-41a49014", "132f2a-8ade-41a49014", "132f2a-8ade-41a49014", "132f2a-8ade-41a49014", "132f2a-8ade-41a49014", "132f2a-8ade-41a49014", "132f2a-8ade-41a49014", "132f2a-8ade-41a49014", "132f2a-8ade-41a49014", "132f2a-8ade-41a49014", "132f2a-8ade-41a49014", "132f2a-8ade-41a49014", "132f2a-8ade-41a49014", "132f2a-8ade-41a49014", "132f2a-8ade-41a49014", "132f2a-8ade-41a49014", "132f2a-8ade-41a49014", "132f2a-8ade-41a49014", "132f2a-8ade-41a49014", "132f2a-8ade-41a49014", "132f2a-8ade-41a49014", "132f2a-8ade-41a49014", "132f2a-8ade-41a49014", "132f2a-8ade-41a49014", "132f2a-8ade-41a49014", "132f2a-8ade-41a49014"
7 Accept-Ranges: bytes, bytes, bytes, bytes, bytes, bytes, bytes, bytes, bytes, bytes, bytes, bytes, bytes, bytes, bytes, bytes, bytes, bytes, bytes, bytes, bytes, bytes, bytes, bytes, bytes, bytes, bytes, bytes, bytes, bytes, bytes, bytes, bytes
8 Last-Modified: Wed, 24 Nov 2004 13:43:48 GMT
9 Content-Length: 34389
10 Content-Type: image/jpeg
11 Age: 206
12 Keep-Alive: timeout=5, max=100
13 Connection: Keep-Alive

19:55:54 (492.55 KB/s) - `it_header_sky-materazi.jpg' saved [34389/34389]


Il nostro reverse-proxy-cache part time ZIO sembra impazzito… non ho ancora identificato il problema ma l’ho tolto dal pool di cache sotto il load-balancer. La cosa strana è che la configurazione è del tutto identica alle altre due cache che hanno funzionato bene finora.

Coincidenza ho anche qualche problema con la cache in test basata su squid… ogni tanto muore senza dare errori…