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How do you install Caddy on Ubuntu Linux?

The recommended path on Debian and Ubuntu is Caddy's official APT repository, which keeps the package up to date through normal apt upgrades.

sudo apt install -y debian-keyring debian-archive-keyring apt-transport-https curl
curl -1sLf 'https://dl.cloudsmith.io/public/caddy/stable/gpg.key' \
  | sudo gpg --dearmor -o /usr/share/keyrings/caddy-stable-archive-keyring.gpg
curl -1sLf 'https://dl.cloudsmith.io/public/caddy/stable/debian.deb.txt' \
  | sudo tee /etc/apt/sources.list.d/caddy-stable.list
sudo apt update
sudo apt install caddy

This registers Caddy's signing key, adds the repository, and installs the package along with a ready-to-use systemd unit. Alternatives include downloading the static binary directly from the Caddy website, installing via Homebrew on macOS, using the official Docker image, or building a custom binary with xcaddy when extra plugins are needed.

On Debian/Ubuntu, the recommended Caddy install source is:
After the repository is registered, which command installs Caddy?

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What is Caddy Server? What are the key features of Caddy? What is automatic HTTPS in Caddy? What is a Caddyfile? What is the purpose of the reverse_proxy directive? What are the types of Caddy configuration formats? How do you install Caddy on Ubuntu Linux? How do you start, stop, and reload the Caddy service? How do you serve static files with Caddy? What is the purpose of the file_server directive? What is the encode directive used for? How do you configure access logging in Caddy? What is the respond directive used for? Define matchers in Caddyfile? What is the purpose of the header directive? How do you redirect HTTP to HTTPS in Caddy? What is the Caddy admin API? List the certificate authorities Caddy can obtain TLS certificates from? What are Caddy modules? How do you use environment variable placeholders in a Caddyfile? Why is Caddy considered easier to configure than Nginx? Why do we use the Caddyfile instead of writing JSON directly? How does Caddy handle automatic certificate renewal? How is load balancing configured in Caddy's reverse_proxy? What is the difference between Caddy v1 and Caddy v2? What is the difference between the Caddyfile and JSON config format? Which is better and why: Caddy or Nginx for a small project that needs HTTPS quickly? How can you optimize Caddy for high-traffic websites? How do you troubleshoot Caddy certificate issues? Explain the lifecycle of a Caddy TLS certificate? Explain the execution flow of an HTTP request in Caddy? Explain the internal working of Caddy's config adapter? What happens when Caddy fails to obtain a certificate? When should you use on-demand TLS in Caddy? When would you choose Caddy over Traefik? How does Caddy implement HTTP/3 support? Why doesn't Caddy require a separate Certbot setup? What is the difference between snippets and named matchers in a Caddyfile? How do you configure basic authentication in Caddy? How do you set up a wildcard certificate in Caddy? Explain the internal working of Caddy's module system? How do you build a custom Caddy binary with xcaddy? Explain the execution flow of Caddy's middleware chain? How does Caddy's storage module work for certificate persistence? What is the purpose of the layer4 app in Caddy? How do you configure Caddy for zero-downtime configuration reloads at scale? Explain the internal working of CertMagic in Caddy? How do you implement rate limiting in Caddy? What is the difference between Caddy's global options block and site address blocks? How do you set up a multi-domain reverse proxy with per-host TLS in Caddy?
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