Fallback to the Internet if Images cant be found local

[oe3gwu]

Is your feature request related to a problem? Please describe.
No.

Describe the solution you'd like
If I change "set live_endpoint" to a local endpoint, netboot shoot try to find the image. If the image isnt found locally, an automatically fallback to https://github.com/netbootxyz should happen. Currently the Boot Process fails.

Describe alternatives you've considered
Download all the Images, thats nice but really not a solution for a Raspberry Pi Docker Container.

Additional context

[miawgogo]

I have managed to modify the nginx config to do this on my instance with the following settings

server {
        listen [NGINX_PORT];
        resolver 8.8.8.8;
        location / {
                root /assets;
                autoindex on;
                try_files $uri $uri/ @fallback;
        }
        location @fallback{
            rewrite  ^/(.*) /netbootxyz/$1 break;
            proxy_pass https://github.com;
            #proxy_redirect / /;
            proxy_intercept_errors on;
            error_page 301 302 307 = @handle_redirect;
        }
        location @handle_redirect {
            set $saved_redirect_location '$upstream_http_location';
            proxy_pass $saved_redirect_location;
        }
}

its not the best as its a combination of stuff from stackoverflow and some of my own config. the fallback is what redirects it to the github mirror if it cant find a file and the @handle_redirect is to hide the redirect from github.com to objects.githubusercontent.com. Ive not added caching to my config yet, but i will at somepoint to help with performance

[grmrgecko]

To add caching:

proxy_cache_path        /assets/cache keys_zone=fallback_cache:30720m levels=1:2 max_size=30720m inactive=30d;
proxy_buffer_size       128k;
proxy_buffers           4 256k;
proxy_busy_buffers_size 256k;

server {
        listen 80;
        resolver 8.8.8.8;
        location / {
                root /assets;
                autoindex on;
                try_files $uri $uri/ @fallback;
        }
        location @fallback {
            rewrite  ^/(.*) /netbootxyz/$1 break;
            proxy_cache_revalidate on;
            proxy_cache            fallback_cache;
            proxy_cache_valid      200 30d;
            proxy_cache_use_stale  error timeout invalid_header updating;
            proxy_pass             https://github.com;
            proxy_intercept_errors on;
            error_page 301 302 307 = @handle_redirect;
            add_header X-Netboot-Cache $upstream_cache_status;
        }
        location @handle_redirect {
            set $saved_redirect_location '$upstream_http_location';
            proxy_cache_revalidate on;
            proxy_cache            fallback_cache;
            proxy_cache_valid      200 30d;
            proxy_cache_use_stale  error timeout invalid_header updating;
            proxy_pass $saved_redirect_location;
            add_header X-Netboot-Cache $upstream_cache_status;
        }
}

[gissf1]

I skipped the caching for now on my system, but I think you can simplify the nginx config (or at least it worked for me) by doing this to simply redirect the client to the public live server:

server {
        listen 80;
        location / {
                root /assets;
                autoindex on;
                try_files $uri $uri/ @fallback;
        }
        location @fallback{
                return   307 https://github.com/netbootxyz$request_uri;
        }
}

[LATINO-BICEPS]

@grmrgecko Is this still working for you? My cache dir is growing but nothing is being pulled from it. There are no changes in my nginx config and I have modified local-vars.ipxe to set live_endpoint http://x.x.x.x:8080.