Installing Caddy #

The Caddy installation process is designed to adapt to various infrastructure needs, from Linux-based virtual servers (VM/VPS), containerized environments (Docker), to standalone compilation for custom plugin needs. Because Caddy is distributed as a single binary without external dependencies, the installation process is essentially very simple and clean. However, each method has different port management, access rights, and update lifecycle characteristics.

In this section, we’ll discuss five main installation methods in depth to help us determine the best path for setting up Caddy on production servers and local development environments.

Installation Learning Roadmap #

Here’s the series of articles in this section that will guide us in installing and setting up Caddy:

flowchart TD
    A["1. Overview<br/>(Roadmap & Methods)"] --> B["2. Ubuntu / Debian<br/>(APT & Systemd)"]
    B --> C["3. CentOS / RHEL<br/>(COPR & SELinux)"]
    C --> D["4. Docker Container<br/>(Isolation & Data Volumes)"]
    D --> E["5. Docker Compose<br/>(Multi-Service Orchestration)"]
    E --> F["6. Compile from Source<br/>(xcaddy & DNS Plugins)"]
    F --> G["READY: Section 03<br/>(Caddyfile Structure)"]

    style A stroke:#0288d1,stroke-width:2px
    style B stroke:#0288d1,stroke-width:2px
    style C stroke:#0288d1,stroke-width:2px
    style D stroke:#0288d1,stroke-width:2px
    style E stroke:#0288d1,stroke-width:2px
    style F stroke:#0288d1,stroke-width:2px
    style G stroke:#43a047,stroke-width:2px

Through these modules, we not only install Caddy, but also understand the best ways to configure systemd, handle privileged port permissions, compose modular containers, and build custom binaries.

Installation Method Comparison #

Before we choose the method to apply, let’s compare the advantages and disadvantages of each available installation path:

Installation Method	Update Ease	Plugin Support	System Isolation	Configuration Ease	Main Use Case
APT / COPR (Linux)	Very Easy (`apt upgrade` / `dnf update`)	Limited (Built-in modules only)	Low (Bare-metal/VM)	Very Easy (Plain text file)	Standard server VMs, single servers, fast deployment.
Docker (Standard)	Easy (Pull a new image)	Easy (Via multi-stage build)	High (Container)	Medium (Env Vars/Volumes)	Microservices, single apps, development environments.
Docker Compose	Easy (Compose pull & up)	Easy (Via custom Dockerfile)	High (Container network)	Very Easy (Declarative)	Multi-service applications (Web + App + DB) in production.
Compile (xcaddy)	Manual (Rebuild the binary)	Very Broad (Free module installation)	Low (Bare-metal/VM)	Medium (Build scripts)	Need DNS modules (Cloudflare, Route53) for Wildcard SSL.

Decision Tree — Choosing the Right One #

We can follow the flowchart below to determine which installation method best suits our architecture needs:

flowchart TD
    Start{"How will Caddy be run?"}
    Start -- "Using Containers" --> Docker{"Need many services?"}
    Docker -- "Yes (Multi-container)" --> Compose["Docker Compose"]
    Docker -- "No (Single-container)" --> DocSingle["Docker (Standard)"]
    Start -- "Directly on the Server (Bare Metal/VM)" --> Plugins{"Need additional plugins (e.g., Cloudflare DNS)?"}
    Plugins -- "Yes" --> Compile["Compile via xcaddy"]
    Plugins -- "No" --> Distro{"Operating System?"}
    Distro -- "Ubuntu / Debian" --> APT["APT Package Manager"]
    Distro -- "CentOS / RHEL / Fedora" --> COPR["COPR Package Manager"]

    style Compose stroke:#0288d1,stroke-width:2px
    style DocSingle stroke:#0288d1,stroke-width:2px
    style Compile stroke:#0288d1,stroke-width:2px
    style APT stroke:#0288d1,stroke-width:2px
    style COPR stroke:#0288d1,stroke-width:2px

Summary #

Standard Linux Distros — Using APT (Ubuntu/Debian) or COPR (CentOS/RHEL) is the best choice for single servers because they provide mature systemd integration and automatic updates.
Containerization — Docker Compose is recommended for modern multi-service applications because it simplifies isolated network orchestration and persistent volumes.
Custom Modules — If we need Wildcard SSL certificates using the DNS-01 challenge, we must use xcaddy to compile a Caddy binary with the appropriate DNS provider plugin.
Automatic HTTPS — All the methods above fully support Caddy’s automatic HTTPS feature, as long as ports 80 and 443 are open to the public internet and the domain is pointed correctly.

← Previous: Caddy Architecture Next: Ubuntu / Debian →