Log cache hit or miss in log file

[akash-rp]

Hi, Is their any way to log cache hit or miss in the log file

[jiangwenyuan]

Yes

By enabling haproxy log, you can tell a hit or miss by check backend:

Dec  9 23:54:51 localhost haproxy[1487]: 127.0.0.1:54105 [09/Dec/2021:23:54:51.476] fe-cache be-cache/s1 0/0/0/1/2 200 818 - - ---- 1/1/0/0/0 0/0 "GET / HTTP/1.1"                                                                           
Dec  9 23:54:52 localhost haproxy[1487]: 127.0.0.1:54109 [09/Dec/2021:23:54:52.161] fe-cache be-cache/<NUSTER.CACHE.ENGINE> 0/0/0/0/0 200 818 - - ---- 1/1/0/0/0 0/0 "GET / HTTP/1.1"                                                        

So if the backend is <NUSTER.CACHE.ENGINE>, it's a hit.

And you can log hit header if you wish

http-response add-header hit yes if { nuster.cache.hit }                                          
declare capture response len 20                                                                   
http-response capture res.hdr(hit) id 0                                                           
                                                                                                    
log-format "|%[capture.res.hdr(0)]| %ci:%cp [%tr] %ft %b/%s %TR/%Tw/%Tc/%Tr/%Ta %ST %B %CC %CS %tsc %ac/%fc/%bc/%sc/%rc %sq/%bq %hr %hs %{+Q}r"                                

And you will get logs like

Dec 10 00:04:56 localhost haproxy[1572]: |yes| 127.0.0.1:54149 [10/Dec/2021:00:04:56.654] fe-cache be-cache/<NUSTER.CACHE.ENGINE> 0/0/0/0/0 200 818 - - ---- 1/1/0/0/0 0/0 {yes} "GET /? HTTP/1.1"                                           

[akash-rp]

Thank You