maintenance/hydra/nginx/hydra.gnu.org-locations.conf

# Configuration of the various locations at hydra.gnu.org.
# This file is meant to be included in the main configuration file.

location /guix/nar/ {
    # Served by:
    # guix publish -p 9999 --listen=127.0.0.1 -u nobody -C8 --cache=/var/cache/guix/publish --ttl=14d --workers=2 --nar-path=guix/nar --public-key=/home/hydra/narinfo-key.pub --private-key=/home/hydra/narinfo-key.sec
    proxy_pass http://127.0.0.1:9999;

    client_body_buffer_size 256k;

    # Enable caching for nar files, to avoid reconstructing and recompressing
    # archives.
    proxy_cache nar;
    proxy_cache_valid 200 15d;  # cache hits for 15 days.
    proxy_cache_valid 504 3m;   # timeout, when the machine is overloaded
    proxy_cache_valid any 1m;   # cache misses/others for 1 min.

    proxy_ignore_client_abort on;

    # Be more tolerant of delays when fetching a nar.  Using a shorter
    # timeout leads to users retrying, which in turn triggers another
    # export-and-compress process, which quickly brings the machine
    # down.
    proxy_read_timeout 60s;
    proxy_send_timeout 60s;

    # Nars are already compressed.
    gzip off;
}

location /nix-cache-info {
    proxy_pass http://127.0.0.1:9999;

    # Cache this file since that's always the first thing we ask for.
    proxy_cache static;
    proxy_cache_valid 200 10d;   # cache hits for a looong time.
    proxy_cache_valid any 5m;    # cache misses/others for 5 min.
    proxy_ignore_client_abort on;

    # We need to hide and ignore the Set-Cookie header
    # to enable caching.
    proxy_hide_header    Set-Cookie;
    proxy_ignore_headers Set-Cookie;

    # Tell browsers to cache these things.
    expires 10d;
}

location ~ \.narinfo$ {
    # Narinfos served by 'guix publish' (see above).  If we change the
    # port to 3000, then they are served by Hydra.
    #
    # Since 'guix publish' has its own caching, and since it relies on
    # the atime of cached narinfos to determine whether a narinfo can
    # be removed from the cache, don't do any caching here.  (Hydra
    # computed narinfos on the fly so it definitely needed caching.)
    proxy_pass http://127.0.0.1:9999;

    # For HTTP pipelining.  This has a dramatic impact on performance.
    client_body_buffer_size 128k;

    # Narinfos requests are short, serve many of them on a connection.
    keepalive_requests 600;

    # Do not tolerate slowness of hydra.gnu.org when fetching
    # narinfos: better return 504 quickly than wait forever.  However,
    # since hydra.gnu.org is often overloaded, keep the timeouts not
    # too small.
    proxy_connect_timeout 4s;
    proxy_read_timeout 6s;
    proxy_send_timeout 6s;

    # 'guix publish --ttl' produces a 'Cache-Control' header for use
    # by 'guix substitute'.  Let it through rather than use nginx's
    # "expire" directive since the expiration time defined by 'guix
    # publish' is the right one.
    proxy_pass_header Cache-Control;

    proxy_ignore_client_abort on;

    # We need to hide and ignore the Set-Cookie header
    # to enable caching.
    proxy_hide_header    Set-Cookie;
    proxy_ignore_headers Set-Cookie;
}

# Content-addressed files served by 'guix publish'.  No need to cache
# it because it is served right from the store without any additional
# processing (see above for the full 'guix publish' command).
location /file/ {
    proxy_pass http://127.0.0.1:9999;

    proxy_connect_timeout 3s;
}

# For use by Certbot.
location /.well-known {
    root /var/www;
}

# Bye bye!
location / {
    return 301 https://ci.guix.gnu.org;
}