Working with hydra config files

Hydra config files, not to be confused with hydra-cli’s configuration settings, are used by services when they initialize hydra or hydra-express.

Those config files are commonly loaded at runtime and their contents are passed to Hydra.

During startup, if Hydra see’s the HYDRA_REDIS_URL and the HYDRA_SERVICE environment variables then Hydra will ask the specified Redis instance for a copy of its config file.

The environment variables should be defined this way:


This is commonly used when hydra-enabled applications are used in Docker containers.

Hydra-cli offers the cfg command for listing, loading and uploading configuration file data to Redis.

You can retrieve a list of configs using:

$ hydra-cli cfg list myservice

To store a config you’d have to specify the service name separated by a colon and the service version.

$ hydra-cli cfg pull myservice:0.12.1

Using the cfg pull command above the retrieved config would be displayed in the terminal. To save the pulled config to a file you can direct it using:

$ hydra-cli cfg pull myservice:0.12.1 

To upload a config you can use the cfg push command:

$ hydra-cli cfg push myservice:0.12.2 config.json

Listing configs, retrieving one and saving it to a file — then later modifying it prior to uploading it is how you manage your service’s configs.

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