https://github.com/caddyserver/caddy/issues/3887Caddy会创建一个 caddy 用户并安装使用该用户的 systemd 服务文件。caddy 用户的家目录是 /var/lib/caddy具体位置/var/lib/caddy/.local/share/caddy/certificates/acme-v02.api.letsencrypt.org-directory/xxx.com/