Getting started

New project

Use the template flake provided by services-flake:

mkdir example && cd ./example
nix flake init -t github:juspay/services-flake
nix run

Existing project

services-flake uses process-compose-flake to manage the services. Let’s first import the flake-parts modules provided by process-compose-flake and services-flake in your flake:

{
  # 1. Add the inputs
  inputs.process-compose-flake.url = "github:Platonic-Systems/process-compose-flake";
  inputs.services-flake.url = "github:juspay/services-flake";
  ...
  outputs = inputs:
    inputs.flake-parts.lib.mkFlake { inherit inputs; } {
      imports = [
        # 2. Import the flake-module
        inputs.process-compose-flake.flakeModule
      ];
      perSystem = { ... }: {
        # 3. Create the process-compose configuration, importing services-flake
        process-compose."myservices" = {
          imports = [
            inputs.services-flake.processComposeModules.default
          ];
        };
      }
    };
}

As an example, let’s add the redis service to your flake:

# Inside `perSystem.process-compose."myservices"`
{
  services.redis."r1".enable = true;
}

Time to run the service:

nix run .#myservices

Under the hood

• The services-flake module configures process settings for a service. In simple terms, it handles stuff like health checks, restart policies, setup scripts, etc. by using the easy to configure APIs provided by process-compose-flake.
• The process-compose-flake module uses these settings to generate packages.${system}.myservices ¹ (nix run .#myservices above, runs this package by default), which runs process-compose with the generated YAML configuration ² .

Examples

• In Nammayatri, services-flakes is used to run the local services stack (which used to be run with docker-compose). Read about it in this blog post.