nginx as load balancer: upstream with path - caching

Question

i've an nginx container, on port 9200, that acts as load balancer. This is config file:
proxy_ignore_headers Set-Cookie;
add_header 'Access-Control-Allow-Origin' '*';
add_header 'Access-Control-Allow-Headers' 'Range';
upstream backend {
server 192.168.99.103:9500 weight=3;
server 192.168.99.104:9500;
server 192.168.99.105:9500;
}
server {
listen 80;
server_name 172.17.0.1;
location = /LynyrdSkynyrdFreebirdAudio.mp4 {
add_header 'Access-Control-Allow-Origin' '*';
add_header 'Access-Control-Allow-Headers' 'Range';
if ($request_method = OPTIONS ) {
add_header Access-Control-Allow-Methods "GET, OPTIONS";
add_header Content-Length 0;
add_header Content-Type text/plain;
return 200;
}
proxy_pass http://backend/;
add_header X-Upstream $upstream_addr;
}
location = /LynyrdSkynyrdFreebirdVideo.mp4 {
add_header 'Access-Control-Allow-Origin' '*';
add_header 'Access-Control-Allow-Headers' 'Range';
if ($request_method = OPTIONS ) {
add_header Access-Control-Allow-Methods "GET, OPTIONS";
add_header Content-Length 0;
add_header Content-Type text/plain;
return 200;
}
proxy_pass http://backend;
add_header X-Upstream $upstream_addr;
}
}
This container load balance requests in the following way: when arrives a request localhost:9200/LynyrdSkynyrdFreebirdVideo.mp4 or localhost:9200/LynyrdSkynyrdFreebirdAudio.mp4, it balances requests across 3 servers.
These 3 servers are 3 nginx containers that acts as cache.
This is config file of nginx caches:
proxy_cache_path /tmp/nginx levels=1:2 keys_zone=my_zone:10m inactive=60m;
proxy_cache_key "$scheme$request_method$host$request_uri";
proxy_cache_methods GET HEAD POST;
proxy_cache_valid 200 206 100m;
proxy_ignore_headers Set-Cookie;
add_header 'Access-Control-Allow-Origin' '*' always;
add_header 'Access-Control-Allow-Headers' 'Range';
server {
listen 80;
server_name 172.17.0.1;
#charset koi8-r;
#access_log /var/log/nginx/log/host.access.log main;
location / {
}
#error_page 404 /404.html;
# redirect server error pages to the static page /50x.html
#
error_page 500 502 503 504 /50x.html;
location = /50x.html {
root /usr/share/nginx/html;
}
# proxy the PHP scripts to Apache listening on 127.0.0.1:80
#
#location ~ \.php$ {
# proxy_pass http://127.0.0.1;
#}
# pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000
#
#location ~ \.php$ {
# root html;
# fastcgi_pass 127.0.0.1:9000;
# fastcgi_index index.php;
# fastcgi_param SCRIPT_FILENAME /scripts$fastcgi_script_name;
# include fastcgi_params;
#}
# deny access to .htaccess files, if Apache's document root
# concurs with nginx's one
#
#location ~ /\.ht {
# deny all;
#}
location /demo/ {
proxy_cache my_zone;
add_header X-Proxy-Cache $upstream_cache_status;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $remote_addr;
proxy_set_header Host $host;
proxy_pass http://172.17.0.1:8700/shaka-player-master/demo/index1.html ;
}
location /media {
proxy_cache my_zone;
add_header X-Proxy-Cache $upstream_cache_status;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $remote_addr;
proxy_set_header Host $host;
proxy_pass http://172.17.0.1:8700/shaka-player-master/media/example-av.mpd ;
}
location = /example-av1.mpd {
add_header 'Access-Control-Allow-Origin' '*';
proxy_cache my_zone;
add_header X-Proxy-Cache $upstream_cache_status;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $remote_addr;
proxy_set_header Host $host;
proxy_pass http://192.168.99.103:9600/shaka-player/media/example-av1.mpd;
}
location = /LynyrdSkynyrdFreebirdVideo.mp4 {
add_header 'Access-Control-Allow-Origin' '*';
add_header 'Access-Control-Allow-Headers' 'Range';
proxy_cache my_zone;
add_header X-Proxy-Cache $upstream_cache_status;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $remote_addr;
proxy_set_header Host $host;
proxy_pass http://192.168.99.103:9600/shaka-player/media/LynyrdSkynyrdFreebirdVideo.mp4 ;
}
location = /LynyrdSkynyrdFreebirdAudio.mp4 {
add_header 'Access-Control-Allow-Origin' '*';
add_header 'Access-Control-Allow-Headers' 'Range';
proxy_cache my_zone;
add_header X-Proxy-Cache $upstream_cache_status;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $remote_addr;
proxy_set_header Host $host;
proxy_pass http://192.168.99.103:9600/shaka-player/media/LynyrdSkynyrdFreebirdAudio.mp4;
}
}
If i point to load balancer, i.e. localhost:9200/LynyrdSkynyrdFreebirdVideo.mp4 or localhost:9200/LynyrdSkynyrdFreebirdAudio.mp4, there is 404 not found. I expect that, if i point to this URL, load balancer balances request to 192.168.99.103(or 104, or 105):9500/LynyrdSkynyrdFreebirdVideo.mp4 or 192.168.99.103(or 104, or 105):9500/LynyrdSkynyrdFreebirdAudio.mp4.
But in the upstream block i don't know if in server directive i can add a path.
In fact, this is, i think, the very problem: in fact, if i point to 192.168.99.103(or104, or105):9500/LynyrdSkynyrdFreebirdAudio(or Video).mp4, i get the content correctly.
Can anyone helps me?

Answer 1

Solved:
i have added path to http://backend, like:
proxy_pass http://backend/LynyrdSkynyrdFreebirdVideo.mp4;