View Nginx Cache Hit rate

first, add a hit display on the HTTP header

Nginx provides $upstream_cache_status this variable to show the state of the cache, we can add an HTTP header in the configuration to display this state, to achieve similar squid effect.

 

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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_f or; proxy_connect_timeout ; proxy_send_timeout ; proxy_read_timeout ; 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 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;     }

The header you see through Curl or browser is as follows:

 

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HTTP/1.1 OK Date: Mon, April: 02 GMT Server: nginx Content-Type: image/jpeg Content-Length: 23560 last-Modified: Thu, April :05 : GMT Nginx-Cache: hitAccept-Ranges: bytes Vary: User-Agent

$upstream _cache_status contains the following states:

· MISS miss, request is routed to backend
· Hit Cache Hits
· EXPIRED Cache has expired request sent to backend
· UPDATING is updating the cache and will use the old answer
· STALE back end will get an expired reply

second, Nginx cache hit rate statistics

That is, Nginx provides us with the $upstream_cache_status function, which naturally writes the hit state to the log. Specifically, you can define the log format as follows:

 

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log_format   main   ' $remote _addr-$remote _ User [$time _local] "$request" '                                       < Span class= "Crayon-s" "$http _user_agent" "$http _x_forwarded_for" '                   < Span class= "Crayon-s", "$upstream _cache_status" '

Hit Count method: Divide the number of hits by the total log amount to get the cache hit rate:

 

1	awk ' {if ($NF = = "" Hit ") hit++} END {printf"%.2f% ", Hit/nr} ' access. Log

Once you understand the principle, you can also use the Crontab script to count the daily hits to a log for viewing.

 

1 2	# crontab-l 1 0 * * * /opt /shell/nginx_cache _hit >> /usr/local/ nginx/logs/hit

The contents of the visit script are:

 

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#!/bin/bashlog_file='/usr/local/nginx/logs/access.log.1 ' Last_day=$(date +%F -D "-1 day") awk ' {if ($NF = = "" Hit "") hit++} END {printf "'$ last_day':%d%d%.2f%n", HIT,NR,HIT/NR } ' $log_file

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View Nginx Cache Hit rate