Agate is a server for the Gemini network protocol, built with the Rust programming language. Agate has very few features, and can only serve static files. It uses async I/O, and should be quite efficient even when running on low-end hardware and serving many concurrent requests.

• Home page: gemini:https://gem.limpet.net/agate/
• Cargo package
• Source code

1. Download and unpack the pre-compiled binary.

   Or, if you have the Rust toolchain installed, run cargo install agate to install agate from crates.io.

   Or download the source code and run cargo build --release inside the source repository, then find the binary at target/release/agate.

2. Generate a self-signed TLS certificate and private key. For example, if you have OpenSSL 1.1 installed, you can use a command like the following. (Replace the hostname with the address of your Gemini server.)

openssl req -x509 -newkey rsa:4096 -keyout key.rsa -out cert.pem \
    -days 3650 -nodes -subj "/CN=example.com"

3. Run the server. The command line arguments are agate <addr:port> <content_dir> <cert_file> <key_file> [<domain>]. For example, to listen on the standard Gemini port (1965) on all interfaces:

agate 0.0.0.0:1965 path/to/content/ cert.pem key.rsa

Agate will check that the port part of the requested URL matches the port specified in the 1st argument. If <domain> is specified, agate will also check that the host part of the requested URL matches this domain.

When a client requests the URL gemini:https://example.com/foo/bar, Agate will respond with the file at path/to/content/foo/bar. If there is a directory at that path, Agate will look for a file named index.gmi inside that directory.

Optionally, set a log level via the AGATE_LOG environment variable. Logging is powered by the env_logger crate:

AGATE_LOG=info 0.0.0.0:1965 path/to/content/ cert.pem key.rsa