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configs.nix-farm: never mark B2 down in cache.lassul.us upstream
author
Hermes
committer
lassulus
date
(Oct 15, 2026, 8:49 AM CEST)
commit
62d66e21
62d66e214bc5c850d1e22c93bf488d5244a3b33e
parent
eff12fdd
eff12fdd6b804192edda174380f472faef4e1b54
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configs/nix-farm/cache.nix
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configs/nix-farm/cache.nix
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# `keepalive` + HTTP/1.1 below: reuse TLS connections to B2. Without them
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# nginx spoke HTTP/1.0 with a new handshake per request; at a farm run's
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# ~400 req/s B2 started closing connections mid-response.
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# `max_fails=0`: B2 closes idle keepalive connections now and then. With the
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# default max_fails=1 one such close marked that B2 address down for 10s;
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# once all of them were, every request got "no live upstreams" and a 502
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# (failed a farm run). A GET/HEAD on a closed reused connection is retried
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# (default `proxy_next_upstream error timeout`) without using up a try, on
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# the next address, or on the same one if it resolves to only one.
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services.nginx.appendHttpConfig = ''
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upstream cache_lassul_us_b2 {
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zone cache_lassul_us_b2 64k;
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resolver 127.0.0.53 ipv6=off;
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server ${endpoint}:443 resolve;
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server ${endpoint}:443 resolve max_fails=0;
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keepalive 64;
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keepalive_requests 10000;
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keepalive_timeout 60s;