I am new to nginx caching but have worked with nginx a lot. I tried enabling
caching feature in our repository but it never worked so I thought I will
pull a fresh copy of nginx and turn it on. I ended with the same issue. For
some reason, nginx is not able to create the cache file in the cache dir. I
have already turned on proxy buffering and set full rw permission for all
users on the cache dir. I also gdb'ed the code and it seems like it gets
into ngx_open_and_stat_file from ngx_open_cached_file (
http://lxr.nginx.org/source/src/core/ngx_open_file_cache.c?v=nginx-1.12.0#0144
) and it tries to open an non existent file in RDONLY mode if the of->log is
not set (
http://lxr.nginx.org/source/src/core/ngx_open_file_cache.c?v=nginx-1.12.0#0869
)
Any help here would be awesome. I have also pasted my relevant config and
debug log below.
Here's my configuration.. (only the relevant part)
http {
proxy_cache_path /tmp/nginx/cache levels=1:2 keys_zone=STATIC:10m
inactive=24h max_size=1g;
server {
listen 80;
server_name localhost;
proxy_buffering on;
location / {
proxy_pass http://52.216.66.40$request_uri;
proxy_set_header Host images.clipartpanda.com;
proxy_buffering on;
proxy_cache STATIC;
add_header X-Proxy-Cache $upstream_cache_status;
root html;
index index.html index.htm;
}
}
And here's the debug log showing whats that nginx is failing to create the
cache file.
2018/02/05 08:57:26 [debug] 22509#0: *7 http cache key:
"http://52.216.66.40"
2018/02/05 08:57:26 [debug] 22509#0: *7 http cache key:
"/teddy-clip-art-teddy-md.png"
2018/02/05 08:57:26 [debug] 22509#0: *7 add cleanup: 00000000006D3560
2018/02/05 08:57:26 [debug] 22509#0: shmtx lock
2018/02/05 08:57:26 [debug] 22509#0: slab alloc: 120 slot: 4
2018/02/05 08:57:26 [debug] 22509#0: slab alloc: 00007FD2C31AA080
2018/02/05 08:57:26 [debug] 22509#0: shmtx unlock
2018/02/05 08:57:26 [debug] 22509#0: *7 http file cache exists: -5 e:0
2018/02/05 08:57:26 [debug] 22509#0: *7 cache file:
"/tmp/nginx/cache/3/4f/ecbc29d001e852b40f09e913b5ced4f3"
2018/02/05 08:57:26 [debug] 22509#0: *7 add cleanup: 00000000006D35B0
2018/02/05 08:57:26 [debug] 22509#0: *7 http upstream cache: -5
And for now i have set "777" perm to the nginx cache dir.
>> ls -lrt /tmp/nginx/
drwxrwxrwx 2 test root 4096 Feb 5 08:20 cache
Posted at Nginx Forum: https://forum.nginx.org/read.php?2,278346,278346#msg-278346
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