Nginx does not delete old cached files

Hi,

I have nginx serve as image cached, here is the main config :

proxy_cache_path /etc/nginx/cache-media levels=1:2 keys_zone=media:1000m
inactive=2y max_size=100g;
proxy_temp_path /etc/nginx/cache-media/tmp;

/dev/sdc1 is an intel SSD with ext4 mounted (-o noatime, nodiratime).

It looks like that the nginx do not evict the old cached files :

Disk usage on /dev/sdc1 :

df -h /dev/sdc1

Filesystem Size Used Avail Use% Mounted on
/dev/sdc1 110G 102G 7.5G 94% /etc/nginx/cache-media

the max_size=100g but the real size has been raise up to 102GB.

Sometime it full up to 100% of the sdc1 disk and get errror : 2015/04/27
12:03:55 [crit] 7708#0: *18862126 pwrite()
“/etc/nginx/cache-media/tmp/0004826203” failed (28: No space left on
device)
while reading upstream,

and I need to manually remove by find && rm -rf

My nginx -V :

ginx version: nginx/1.7.10
built by gcc 4.4.7 20120313 (Red Hat 4.4.7-3) (GCC)
TLS SNI support enabled
configure arguments: --prefix=/etc/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 --pid-path=/var/run/nginx.pid
–lock-path=/var/run/nginx.lock
–http-client-body-temp-path=/var/cache/nginx/client_temp
–http-proxy-temp-path=/var/cache/nginx/proxy_temp
–http-fastcgi-temp-path=/var/cache/nginx/fastcgi_temp
–http-uwsgi-temp-path=/var/cache/nginx/uwsgi_temp
–http-scgi-temp-path=/var/cache/nginx/scgi_temp --user=nginx
–group=nginx
–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_gunzip_module
–with-http_gzip_static_module --with-http_random_index_module
–with-http_secure_link_module --with-http_stub_status_module
–with-http_auth_request_module --with-mail --with-mail_ssl_module
–with-file-aio --with-ipv6 --with-http_spdy_module --with-cc-opt=’-O2
-g
-pipe -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector
–param=ssp-buffer-size=4 -m64 -mtune=generic’

Plz tell me what could be the problem ?

Thank you.

Posted at Nginx Forum:
http://forum.nginx.org/read.php?2,258396,258396#msg-258396

Hello,

  1. Please make sure the cache manager process does not delete the files.
    Attach with strace and make sure there are no file deleting syscalls.

Its still possible that cache files appear too fast and nginx cache
manager just cant delete the files at the same rate.

  1. Is it possible for you to provide a debug log?
    http://nginx.org/en/docs/debugging_log.html

Debug log is needed since nginx start until the lines starting with
"http file cache forced expire: #1 appear in it.

On 27 Apr 2015, at 11:53, atrus [email protected] wrote:

It looks like that the nginx do not evict the old cached files :
12:03:55 [crit] 7708#0: *18862126 pwrite()
configure arguments: --prefix=/etc/nginx --sbin-path=/usr/sbin/nginx
–with-http_mp4_module --with-http_gunzip_module

Posted at Nginx Forum:
http://forum.nginx.org/read.php?2,258396,258396#msg-258396


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Roman A.

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