Cache keeps growing despite Max_size limit

[Maxim Dounin]

Hello!

On Wed, Mar 06, 2013 at 07:02:28AM -0500, jan5134 wrote:

> Hi,
> 
> I'm having issues with nginx where my cache directory keeps growing until
> the hdd is full.
> If anyone can give me any information on how to solve this it will be
> appreciated.
> 
> nginx -V:
> 
> nginx version: nginx/1.2.1
> built by gcc 4.4.6 20110731 (Red Hat 4.4.6-3) (GCC) 
> TLS SNI support enabled
> configure arguments: --prefix=/usr/share/nginx --sbin-path=/usr/sbin/nginx
> --conf-path=/etc/nginx/nginx.conf --error-log-path=/var/log/nginx/error.log
> --http-log-path=/var/log/nginx/access.log
> --http-client-body-temp-path=/var/lib/nginx/tmp/client_body
> --http-proxy-temp-path=/var/lib/nginx/tmp/proxy
> --http-fastcgi-temp-path=/var/lib/nginx/tmp/fastcgi
> --http-uwsgi-temp-path=/var/lib/nginx/tmp/uwsgi
> --http-scgi-temp-path=/var/lib/nginx/tmp/scgi --pid-path=/var/run/nginx.pid
> --lock-path=/var/lock/subsys/nginx --user=nginx --group=nginx
> --with-file-aio --with-ipv6 --with-http_ssl_module --with-http_realip_module
> --with-http_addition_module --with-http_sub_module --with-http_dav_module
> --with-http_flv_module --with-http_mp4_module --with-http_gzip_static_module
> --with-http_random_index_module --with-http_secure_link_module
> --with-http_degradation_module --with-http_stub_status_module
> --with-http_perl_module --with-mail --with-mail_ssl_module
> --add-module=/root/nginx-1.2.1/ngx_slowfs_cache-1.9
> --add-module=/root/nginx-1.2.1/nginx-sticky-module-1.0
> 
> nginx.conf:
> user                            apache;
> 
> worker_processes                4;
> 
> error_log                       /var/log/nginx/error.log emerg;
> pid                             /var/run/nginx.pid;
> 
> worker_rlimit_nofile 30000;
> 
> events {
>         worker_connections      8192;
>         use                     epoll;
>         multi_accept            off;
> }
> 
> http {
>         include                 /etc/nginx/mime.types;
> 
>         sendfile                on;
> 
>         gzip                    on;
>         gzip_min_length         10;
>         gzip_types              text/plain text/css image/png image/gif
> image/jpeg application/x-javascript text/xml
>                                 application/xml application/xml+rss
> text/javascript application/javascript;
>         gzip_vary               on;
>         gzip_comp_level         9;
>         gzip_proxied            any;
>         gzip_disable            msie6;
> 
>         tcp_nodelay             off;
> 
>         log_format              '$remote_addr - $remote_user [$time_local]'
> '"$request" $status $bytes_sent '
>                                 '"$http_referer" "$http_user_agent"
> "$gzip_ratio"';
> 
>         slowfs_cache_path       /var/cache/nginx/cache levels=1:2
> keys_zone=fastcache:4096m max_size=25g;
>         slowfs_temp_path        /var/cache/nginx/temp 1 2;
> 
>         proxy_buffer_size       128k;
>         proxy_buffers           4 256k;
>         proxy_busy_buffers_size 256k;
> 
>         include                 /etc/nginx/sites-enabled/*;
> }

As a quick test you may try switching to a proxy + proxy_cache 
setup instead of slowfs_cache to see if slowfs_cache module 
problem or something more general.

-- 
Maxim Dounin
http://nginx.org/en/donation.html