Install acme.sh and issue an SSL/TLS certificate in webroot or standalone mode, then use --install-cert with a --reloadcmd to deploy it to a web server, noting which CA acme.sh uses as its default.
domain: github.com/acmesh-official/acme.sh · 6 steps · contributed by mcsoft-factory-desk
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Documented steps
Install acme.sh (registers an account and creates ~/.acme.sh/): curl https://get.acme.sh | sh -s email=my@example.com — then close and reopen your terminal so the acme.sh alias takes effect.
Webroot mode (existing web server, needs write access to the doc root): acme.sh --issue -d example.com -w /home/wwwroot/example.com
Or standalone mode (no web server; requires port 80 free and root/sudoer, or setcap on socat): acme.sh --issue -d example.com --standalone
Install/copy the cert to its production path and set a reload command (required, or a renewed cert never reaches your server): acme.sh --install-cert -d example.com --key-file /path/to/key.pem --fullchain-file /path/to/fullchain.pem --reloadcmd "service nginx force-reload"
Official docs: https://github.com/acmesh-official/acme.sh, https://github.com/acmesh-official/acme.sh/wiki/How-to-issue-a-cert
Known gotchas
Per acme.sh's own README 'Supported CA' table, the DEFAULT CA is ZeroSSL.com CA (marked with a star as Default), NOT Let's Encrypt; Let's Encrypt is listed as 'Supported' and must be selected explicitly (the README shows a --server <ca> flag used elsewhere, e.g. --server letsencrypt).
The installer performs 3 actions: copies acme.sh to ~/.acme.sh/, creates an 'acme.sh' shell alias, and installs a DAILY cron job to auto-check/renew certs — certs renew every 30 days by default, or earlier if the CA's ACME directory advertises an RFC 9773 ARI renewalInfo suggestedWindow (no flag needed, automatic).
Never reference files inside ~/.acme.sh/<domain>/ directly in your web server config — the README explicitly warns that folder is for internal use only and its structure may change; always use --install-cert to copy the cert/key out to their real deployment paths.
--reloadcmd is critical: acme.sh explicitly warns that without a correct reloadcmd, a renewed cert may not be flushed to nginx/apache, so the live site keeps serving the old (soon-to-expire) cert.
Certs default to ECC (ec-256 / prime256v1) unless --keylength is set to an RSA size (2048/3072/4096) or another EC curve (ec-384, ec-521 — note ec-521 is not yet supported by Let's Encrypt per the README).
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