NGINX JavaScript module(njs)を使えば再起動やreloadもなしに証明書の差し替えが可能。njsまだ生きてたんだな(失礼
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SSL/TLS Certificate Rotation Without Restarts in NGINX Open Source - NGINX
https://www.nginx.com/blog/ssl-tls-certificate-rotation-without-restarts-in-nginx-open-source/
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