D-4 named the fix and never ran it. Running it:
/etc/letsencrypt/renewal-hooks/deploy/reload-nginx.sh
#!/bin/sh
nginx -t && nginx -s reload
certbot reports "Hook 'deploy-hook' ran", the master stays at PID 585 and
the worker is replaced 28829 -> 37252, and the served certificate changes.
One trap worth naming: certbot prefixes the hook output with "ran with error
output" whenever the hook writes anything to stderr, and nginx's routine
types_hash warning goes to stderr. Everything inside is success — "test is
successful", "signal process started". A monitor that greps for "error"
would read a working hook as a failure. The worker PID is what to check.
Timing needed a clock correction. test-server has NTP off and runs 106
seconds fast; the dev machine matches Google and the Let's Encrypt ACME
endpoint exactly. Corrected, the hook's nginx -t lands at 12:27:50 UTC
against the new certificate's SCT at 12:27:49.054 — one second. The
correction validates itself: uncorrected, the hook would have run 104
seconds before the certificate existed.
That same skew is why D-4's gap was reported 106 seconds short; corrected to
2305s in the previous commit.
Remaining and left alone: whether certbot-renew.timer performs a real
renewal, which cannot be tested for about 89 days.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
18 lines
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18 lines
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Saving debug log to /var/log/letsencrypt/letsencrypt.log
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Processing /etc/letsencrypt/renewal/auth.hyeonworks.com.conf
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Renewing an existing certificate for auth.hyeonworks.com and 2 more
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Hook 'deploy-hook' ran with error output:
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2026/09/04 21:29:36 [warn] 37250#37250: could not build optimal types_hash, you should increase either types_hash_max_size: 1024 or types_hash_bucket_size: 64; ignoring types_hash_bucket_size
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nginx: the configuration file /etc/nginx/nginx.conf syntax is ok
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nginx: configuration file /etc/nginx/nginx.conf test is successful
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2026/09/04 21:29:37 [warn] 37251#37251: could not build optimal types_hash, you should increase either types_hash_max_size: 1024 or types_hash_bucket_size: 64; ignoring types_hash_bucket_size
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2026/09/04 21:29:37 [notice] 37251#37251: signal process started
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Congratulations, all renewals succeeded:
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/etc/letsencrypt/live/auth.hyeonworks.com/fullchain.pem (success)
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