Re: ngx_slab_alloc() failed: no memory in cache keys zone

Nick Urbanik Mon, 18 Sep 2017 18:17:40 -0700

Dear Folks,

On 19/09/17 10:46 +1000, Nick Urbanik wrote:

We have this message repeatedly, despite increasing keys_zone size by
a factor of three to:


proxy_cache_path            /srv/mycache levels=1:2 keys_zone=myzone:150m 
inactive=15d;

This caused the errors to stop for three or four hours and then back
again.

The cache itself is quite big:
sudo du -s /srv/mycache
1826303379      /srv/mycache

and we have many messages like this in our logs:
unlink() "/srv/mycache/c/fc/4e8755ecadf5a82ec7208c16d8ddbfcc" failed (2: No 
such file or directory)

Any suggestions most welcome.


I omitted important details:
$ rpm -q nginx
nginx-1.6.2-1.el6.ngx.x86_64

nginx.conf:

$ sanitise-nginx /etc/nginx/nginx.confuser nginx;

worker_processes  8;
worker_cpu_affinity 00000001 00000010 00000100 00001000 00010000 00100000 
01000000 10000000;

error_log  /var/log/nginx/error.log;

pid        /var/run/nginx.pid;

events {
   worker_connections  4096;
}

http {
   include       /etc/nginx/mime.types;
   default_type  application/octet-stream;

   log_format   main  '$remote_addr - $remote_user [$time_local] "$request" '
                      '$status $request_time $body_bytes_sent "$http_referer" '
                      '"$http_user_agent" "$http_x_forwarded_for" 
$sent_http_content_type '
                      'CACHE KEY(s/ph/u) => $scheme $proxy_host $uri -> 
REQUEST_URI: $request_uri '

'UPSTREAM => $upstream_cache_status $upstream_status $upstream_addr';

   access_log /var/log/nginx/access.log main;

   sendfile        on;

   keepalive_timeout  65;

   proxy_buffering             on;                             # default
   proxy_cache_path            /srv/mycache levels=1:2 keys_zone=mycache:150m 
inactive=15d;
   proxy_temp_path             /srv/mycache_tmp/my.server;
   proxy_cache_key             $scheme$proxy_host$uri;
   proxy_max_temp_file_size    4096m;
   proxy_connect_timeout       5s;                             # how long 
before upstream dead
   proxy_next_upstream         error timeout invalid_header;   # default
   proxy_buffers               10 1M;

   upstream mycache_origin {
       server my.origin.com:80 max_fails=1 fail_timeout=180;
   }

include /etc/nginx/conf.d/acl.conf;

   include /etc/nginx/conf.d/default.conf;
}

I reduced the time
proxy_cache_valid 200 90d
by half from 180d:

$ sanitise-nginx /etc/nginx/conf.d/default.confserver {

   listen       80 default_server;
   server_name  my.server.name.com;

   location /server-status {
       access_log off;
       stub_status on;
   }

   set $range $http_range;
   if ($range = "bytes=0-") {
       set $range "";
   }

   location / {
       proxy_cache             mycache;    # cache keys db
       proxy_cache_valid       200 90d;    # http 200
       proxy_cache_valid       404 1m;     # http 404
       proxy_cache_valid       any 10m;    # any other

       proxy_ignore_headers    "Cache-Control";
       proxy_ignore_headers    "Expires";

       proxy_set_header        Host               my.origin.com;
       proxy_set_header        X-Real-IP          $remote_addr;
       proxy_set_header        X-Forwarded-For    $proxy_add_x_forwarded_for;
       proxy_set_header        Upstream           $upstream_cache_status;
       proxy_set_header        Range              $range;

       proxy_no_cache          0;          # do cache
       proxy_cache_bypass      0;          # take from cache first
       proxy_pass              http://mycache_origin;
   }

   error_page  404              /404.html;
   location = /404.html {
       access_log off;
       root   /usr/share/nginx/html;
   }

   error_page   500 502 503 504  /50x.html;
   location = /50x.html {
       access_log off;
       root   /usr/share/nginx/html;
   }
}

If any other details would help, please let me know.
--
Nick Urbanik http://nicku.org 808-71011 nick.urba...@optusnet.com.au
GPG: 7FFA CDC7 5A77 0558 DC7A 790A 16DF EC5B BB9D 2C24  ID: BB9D2C24
I disclaim, therefore I am.
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Re: ngx_slab_alloc() failed: no memory in cache keys zone

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