Certbot

certbot is a fully-featured, extensible client for the Let’s Encrypt CA (or any other CA that speaks the ACME protocol defined in 2015-2016) that can automate the tasks of obtaining certificates and configuring webservers to use them. This client runs on Unix-based operating systems.

Ubuntu:

• Binaries: certbot and letscrypt
• Renewals configuration: /etc/cron.d/certbot

Examples

To request a certificate:

• Stop your webserver: systemctl nginx stop
• certbot certonly --standalone --preferred-challenges http -d YOUR_DOMAIN_NAME.com
• certbot certonly --standalone --agree-tos --preferred-challenges dns -d *.YOUR_DOMAIN_NAME.com

nginx.conf

ssl_certificate /etc/letsencrypt/live/www.example.com/fullchain.pem;

ssl_certificate_key /etc/letsencrypt/live/www.example.com/privkey.pem;

certonly --standalone

certbot --nginx
Saving debug log to /var/log/letsencrypt/letsencrypt.log
The requested nginx plugin does not appear to be installed

certbot certificates
Saving debug log to /var/log/letsencrypt/letsencrypt.log

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No certs found.
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certbot renew
Saving debug log to /var/log/letsencrypt/letsencrypt.log

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No renewals were attempted.
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• Changing a Certificdate's Domain: certbot certonly --cert-name example.com -d example.org,www.example.org
• Automated renewals: systemctl list-timers

Activities

• Read certbot certbot changelog: https://github.com/certbot/certbot/blob/master/certbot/CHANGELOG.md

See also

• HTTP, HTTP client, HTTP/1.1, HTTP/2, HTTP/3, HTTPS, HSTS CSR, TLS, SSL, openSSL, WebSockets, WebRTC, ssl_certificate QUIC, HPKP, CT, List of HTTP status codes, URL redirection, Content-type:, Webhook, HTTP headers, --insecure, Axios HTTP client, HTTP cookies, HTTP ETag, Hypertext Transfer Protocol -- HTTP/1.1
• DNS: Linux DNS, IP, systemd-resolve, /etc/hosts, whois, Domain registrar, dig, host, nslookup, scutil --dns dnsmasq, bind, delv, .local, .internal, .onion, FQDN, TTL, /etc/resolv.conf, /etc/systemd/resolved.conf, dscacheutil (macOS), hostname, hostnamectl, bind, resolvectl status, DNS sinkhole, Domain name server, LLMNR, Resource records:MX, TXT, NS, CAA, SSHFP, Apex, CNAME, Wildcard DNS records, Subdomain, /etc/nsswitch.conf, 1.1.1.1, 8.8.8.8, CoreDNS, dnsPolicy:, Google Public DNS, DNS caches, Kubernetes ExternalDNS, DNS forwarding, IDNA2008, DNS-1035, Domain name registrars, Split-view DNS, Pi-hole, NextDNS

https://certbot.eff.org/docs/intro.html

https://certbot.eff.org/docs/using.html#changing-a-certificate-s-domains