Nginx + caching of static files


#1

Hi Guys,

I was hoping someone could point out a document where it can teach me
how to setup nginx + caching. I know that traditionally nginx did not
have a native caching and it required you to run ncache or cachemem in
order to perform caching of static content… but does nginx now allow
basic static file caching without the use of any other 3rd app?

Im trying to understand if nginx now has a native caching which would
allow caching of static content. I dont want to get fancy in anyway, I
simply want to allocate say 200mb of storage space to allow caching of
static content. the 200mb should be updated with the most
active/recently seen file request.

reason? im trying to allow nginx to serve the static files from disk
(if it has seen it previously) and not have to go back to the origin
server every single time.

Thanks
Payam


#2

On Mon, Apr 06, 2009 at 10:14:36PM -0700, Payam C. wrote:

simply want to allocate say 200mb of storage space to allow caching of
static content. the 200mb should be updated with the most
active/recently seen file request.

reason? im trying to allow nginx to serve the static files from disk
(if it has seen it previously) and not have to go back to the origin
server every single time.

Get the lastest nginx (0.7.50) and use

proxy_cache_path  /path/to/cache  levels=1:2
                  keys_zone=one:10m
                  inactive=7d  max_size=200m;

proxy_temp_path   /path/to/temp;  # must be on the same filesystem
                                  # as cache

server {

    location / {
        proxy_pass              http://backend;

        proxy_cache             one;
        proxy_cache_key         backend$request_uri;
        proxy_cache_valid       200  1h;
        proxy_cache_use_stale   error timeout invalid_header;
    }

#3

2009/4/6 Igor S. removed_email_address@domain.invalid:

Im trying to understand if nginx now has a native caching which would

       proxy_pass              http://backend;

Igor S.
http://sysoev.ru/en/

proxy_cache_path /path/to/cache levels=1:2
keys_zone=one:10m
inactive=7d max_size=200m;

proxy_temp_path /path/to/temp; # must be on the same filesystem
# as cache

server {

   location / {
       proxy_pass              http://backend;

       proxy_cache             one;
       proxy_cache_key         backend$request_uri;
       proxy_cache_valid       200  1h;
       proxy_cache_use_stale   error timeout invalid_header;
   }

few questions:
1- what does the keys_zone used for
2- what does the “200 1h” in proxy_cache_valid mean
3- how is the “proxy_cache_use_stale error timeout invalid_header”
used?

thanks again Igor,
-Payam


#4

On Mon, Apr 06, 2009 at 10:46:24PM -0700, Payam C. wrote:

Get the lastest nginx (0.7.50) and use
š š š šlocation / {

few questions:
1- what does the keys_zone used for
2- what does the “200 1h” in proxy_cache_valid mean
3- how is the “proxy_cache_use_stale error timeout invalid_header” used?

http://wiki.nginx.org/NginxHttpProxyModule#proxy_cache


#5

On Mon, Apr 6, 2009 at 11:03 PM, Payam C. removed_email_address@domain.invalid wrote:

Hi Guys,
static content. the 200mb should be updated with the most
inactive=7d max_size=200m;
proxy_cache_key backend$request_uri;

       proxy_pass              http://backend;

1- what does the keys_zone used for


Payam Tarverdyan Chychi
Network Security Specialist / Network Engineer

Igor,

using the caching info … i get a “redirect loop” when trying to
download domain.com/images/spacer.gif when the file does not exist
on the origin server … ive also been able replicate this with YSlow
for firefox

When bypassing the proxy/cache and connecting directly to the origin,
i get the proper 404 error
any ideas?

Thanks


#6

On Tue, Apr 07, 2009 at 12:55:37AM -0700, Payam C. wrote:

simply want to allocate say 200mb of storage space to allow caching of
š š š š š š š š š š škeys_zone=one:10m
š š š š š šproxy_cache š š š š š š one;

š š š šlocation / {
few questions:

Igor,

using the caching info … i get a “redirect loop” when trying to
download domain.com/images/spacer.gif when the file does not exist
on the origin server … ive also been able replicate this with YSlow
for firefox

When bypassing the proxy/cache and connecting directly to the origin,
i get the proper 404 error
any ideas?

Probably you have something like

   error_page  404  /404.html;
   proxy_intercept_errors  on;
   recursive_error_pages   on;

without

   location = /404.html {

so the /404.html is proxied to backend again.

Also you may cache 404 errors too:

   proxy_cache_valid    200 1h;
   proxy_cache_valid    404 5m;

#7

2009/4/7 Igor S. removed_email_address@domain.invalid:

2009/4/6 Igor S. removed_email_address@domain.invalid:

Im trying to understand if nginx now has a native caching which would

       proxy_pass              http://backend;

Igor S.
server {

Igor S.

any ideas?

http://sysoev.ru/en/

Right on… that was the problem. fixed with adding exactly what you
said… im now also caching 404

thanks again
-payam


#8

thank you sir =) you are a king!

-Payam

2009/4/6 Igor S. removed_email_address@domain.invalid:


#9

www.ncache.org
an nginx cache module

maybe this can help u .


#10

On Wed, Apr 08, 2009 at 10:51:59AM +0800, ??? wrote:

Dear Igor,

Then, how to use proxy_cache WITH flv streaming?
I tried proxy_cache feature, but it seems that the flv streaming function does not work with proxy_cache.

No, flv is not filter, but handler, thefore it’s not possible.


#11

shinepf

ncache will only compile with versions up to 0.7.43.
with newer once there is a compile error because of the change in
ngx_http_cache_s structure.

are You going to fix anytime soon?


Best Regards
Tomasz P.


#12

Dear Igor,

Then, how to use proxy_cache WITH flv streaming?
I tried proxy_cache feature, but it seems that the flv streaming
function does not work with proxy_cache.

Thanks

Best Regard,

Peng Wu
2009-04-08

On Mon, Apr 06, 2009 at 10:14:36PM -0700, Payam C. wrote:

simply want to allocate say 200mb of storage space to allow caching of
static content. the 200mb should be updated with the most
active/recently seen file request.

reason? im trying to allow nginx to serve the static files from disk
(if it has seen it previously) and not have to go back to the origin
server every single time.

Get the lastest nginx (0.7.50) and use

proxy_cache_path  /path/to/cache  levels=1:2
                  keys_zone=one:10m
                  inactive=7d  max_size=200m;

proxy_temp_path   /path/to/temp;  # must be on the same filesystem
                                  # as cache

server {

    location / {
        proxy_pass              http://backend;

        proxy_cache             one;
        proxy_cache_key         backend$request_uri;
        proxy_cache_valid       200  1h;
        proxy_cache_use_stale   error timeout invalid_header;
    }

#13

On Wed, Apr 08, 2009 at 11:16:30AM +0000, Glen L. wrote:

How about jpg, css, js or any other files?

No problems with these files. Actually, there are no problems with flv
itself. The issue is when you want to get /some.flv?start=5000.
However, it seems flv handler can be converted easy enough to filter.


#14

Hello!

On Wed, Apr 08, 2009 at 03:18:18PM +0400, Igor S. wrote:

On Wed, Apr 08, 2009 at 11:16:30AM +0000, Glen L. wrote:

How about jpg, css, js or any other files?

No problems with these files. Actually, there are no problems with flv
itself. The issue is when you want to get /some.flv?start=5000.
However, it seems flv handler can be converted easy enough to filter.

I wrote generic bytes filter some time ago, and as far as I
understand it may be used for .flv streaming with some trivial
rewrites. I’ve never tried though.

http://mdounin.ru/hg/ngx_http_bytes_filter_module/
http://mdounin.ru/hg/ngx_http_bytes_filter_module/raw-file/tip/README

Maxim D.


#15

On Thu, Apr 09, 2009 at 02:27:15PM -0500, Resicow wrote:

Hi Igor (and everyone else),

I had a few quick questions about the new proxy_cache feature, and I
apologize if they have already been answered.

  1. What about query_strings? Does proxy_cache ignore or include
    query_strings? Is there a way to have it ignore query_strings in the URL?

By default qeury strings are included. You may ignore them using
something
like this:

proxy_cache_key   $host/$uri";

The default proxy_cache_key approximates

proxy_cache_key  $scheme$proxy_host$uri$is_args$args;
  1. How scalable is this system? Could it handle 50 million different
    URIs for instance?

Each key takes 128 bytes in shared memory zone. Therefore you need 6.1G
zone:

key_zone=NAME:6200m;

  1. Any plans for purge capabilities somehow, in the event you need the
    content flushed right away?

Yes, there are such plans.


#16

Hi Igor (and everyone else),

I had a few quick questions about the new proxy_cache feature, and I
apologize if they have already been answered.

  1. What about query_strings? Does proxy_cache ignore or include
    query_strings? Is there a way to have it ignore query_strings in the
    URL?
  2. How scalable is this system? Could it handle 50 million different
    URIs for instance?
  3. Any plans for purge capabilities somehow, in the event you need the
    content flushed right away?

Keep up the great work, thanks for making the world’s best server!

Thanks,

John


#17

Thanks,

That helps me understand how hash tables work.

Question: Is this for proxy_cache:
Bugfix: now nginx takes into account the “X-Accel-Expires”, “Expires”,
and
“Cache-Control” header lines in a backend response.

Or are files always cached for time specified in proxy_cache_valid?

Purging would be amazing, that way I could set proxy_cache_valid to a
day or
more, and know that if a change was made I could just issue a purge for
that
specific key, or key path.

Any plans for nginx to manage the cache by doing a HEAD request looking
for
changed content automatically on the origin at certain intervals?

Thanks!

John

2009/4/10 Igor S. removed_email_address@domain.invalid


#18

汉语能看懂不?

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,869,959#msg-959


#19

On Fri, Apr 10, 2009 at 04:48:25AM -0400, yangguangli wrote:

???

No.


#20

我能看懂 汉语哈哈哈

I can read chinese!

Posted at Nginx Forum:
http://forum.nginx.org/read.php?2,869,2375#msg-2375