Let's Encrypt with Certbot in Nginx - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is Let's Encrypt?

Let's Encrypt is a free, automated, and open certificate authority that provides SSL/TLS certificates to enable HTTPS on websites.

beginner

What is Certbot used for?

Certbot is a tool that automates the process of obtaining and renewing SSL/TLS certificates from Let's Encrypt.

beginner

Which command obtains and installs a certificate for nginx using Certbot?

sudo certbot --nginx

intermediate

How does Certbot verify domain ownership before issuing a certificate?

Certbot uses challenges like HTTP-01, where it places a file on the web server that Let's Encrypt checks to confirm domain control.

intermediate

How can you renew certificates automatically with Certbot?

By setting up a cron job or systemd timer that runs 'certbot renew' regularly to check and renew certificates before they expire.

What is the primary purpose of Certbot?

A To automate SSL certificate issuance and renewal

B To configure nginx server blocks

C To monitor website traffic

D To create DNS records

Certbot automates obtaining and renewing SSL certificates from Let's Encrypt.

Which command is used to install Certbot on Ubuntu?

A sudo apt install certbot python3-certbot-nginx

B sudo yum install certbot

C sudo npm install certbot

D sudo certbot install

On Ubuntu, Certbot and its nginx plugin are installed using apt with 'sudo apt install certbot python3-certbot-nginx'.

What does the '--nginx' flag do when running Certbot?

A Disables nginx

B Starts the nginx server

C Automatically configures nginx to use the new certificate

D Checks nginx version

The '--nginx' flag tells Certbot to edit nginx configuration to use the obtained certificate.

How often should Certbot renew certificates to avoid expiration?

A Every 60 days

B Every 90 days

C Every 120 days

D Every 30 days

Let's Encrypt certificates are valid for 90 days; renewal should happen before expiration.

Which challenge type does Certbot commonly use to verify domain ownership?

A FTP-01 challenge

B DNS-01 challenge

C TLS-ALPN-01 challenge

D HTTP-01 challenge

HTTP-01 challenge is the common method where Certbot places a file on the web server for verification.

Explain the steps Certbot takes to obtain and install a Let's Encrypt certificate for an nginx server.

Think about installation, verification, obtaining, and configuration steps.

Describe how to set up automatic renewal of Let's Encrypt certificates using Certbot.

Focus on scheduling and renewal commands.