nginx提供了$upstream_cache_status这个变量来显示缓存的状态,我们可以在配置中添加一个http头来显示这一状态,达到类似squid的效果。
location / { proxy_redirect off; proxy_set_header Host $host; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_connect_timeout 180; proxy_send_timeout 180; proxy_read_timeout 180; proxy_buffer_size 128k; proxy_buffers 4 128k; proxy_busy_buffers_size 128k; proxy_temp_file_write_size 128k; proxy_cache cache; proxy_cache_valid 200 304 1h; proxy_cache_valid 404 1m; proxy_cache_key $uri$is_args$args; add_header Nginx-Cache “$upstream_cache_status”; proxy_pass http://backend; }
HTTP/1.1 200 OK Date: Mon, 22 Apr 2013 02:10:02 GMT Server: nginx Content-Type: image/jpeg Content-Length: 23560 Last-Modified: Thu, 18 Apr 2013 11:05:43 GMT Nginx-Cache: HIT Accept-Ranges: bytes Vary: User-Agent
为了能够统计缓存的命中率,我们需要在日志中记录这一状态
log_format www.aikaiyuan.com '$remote_addr – $remote_user [$time_local] "$request" ' '$status $body_bytes_sent "$http_referer" ' '"$http_user_agent" "$http_x_forwarded_for"' '"$upstream_cache_status"';
统计方法:用HIT的数量除以日志总量得出缓存命中率:
awk '{if($NF==""HIT"") hit++} END {printf "%.2f%",hit/NR}' access.log 80.52%
转载请注明:爱开源 » Nginx Proxy_Cache 命中率