The Docker images are published at satoshipay/stellar-horizon.

All environment variables that Stellar Horizon accepts are supported. You can find out all available options by running docker run --rm -it satoshipay/stellar-horizon horizon --help. CLI options are exposed as upper/snake-case environment variables, e.g., --stellar-core-url can be set with the STELLAR_CORE_URL environment variable.

Make sure to set the following variables:

• DATABASE_URL: Horizon database URL, e.g., postgres://horizon-db-host/stellar-horizon. See also DATABASE_PASSWORD below.
• STELLAR_CORE_DATABASE_URL: Stellar Core database URL, e.g., postgres://core-db-host/stellar-core. See also STELLAR_CORE_DATABASE_PASSWORD below.
• STELLAR_CORE_URL: Stellar Core HTTP URL, e.g., http://core-host:11626.
• INGEST: ingest data from Stellar Core (true/false)

The following environment variables are optional and can be used to provide passwords separately (e.g., via Kubernetes secrets):

• DATABASE_PASSWORD: if it is provided the string DATABASE_PASSWORD in DATABASE_URL will be replaced with its value.
• STELLAR_CORE_DATABASE_PASSWORD: if it is provided the string STELLAR_CORE_DATABASE_PASSWORD in STELLAR_CORE_DATABASE_URL will be replaced with its value.

There is also an example Docker Compose config – just run docker-compose -f docker-compose.example.yml up to get a functional Stellar Core and Horizon. *Make sure to use a new NODE_SEED if you intend to run this in production!