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The router is a stateless component, allowing it to be scaled horizontally without requiring persistence. However, it needs to fetch artifacts such as the execution configuration and persisted operations from a storage source. By default, the router fetches these from the Cosmo CDN. You can configure custom storage providers to use your own infrastructure instead. For both mechanisms, different storage providers can be used:
  • CDN: The default provider used by Cosmo Cloud.
  • Amazon S3: An object storage protocol. We support any S3 compatible object-storage e.g. Minio and AWS.
When using a custom storage provider, you are responsible for manually pushing those artifacts as part of your CI process.

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Define a provider

Before you can use a storage provider, you have to define it in the storage_providers section of your config.yaml file. Each provider is given an id that you reference from other configuration sections. 
version: 1
storage_providers:
  s3:
  - id: "s3"
    endpoint: "localhost:10000"
    bucket: "cosmo"
    access_key: "key"
    secret_key: "secret"
    region: "us-east-1"
    secure: false
secure has to be set to true when you point to an S3 that uses https://
If you are using EC2 or EKS on AWS and have configured node IAM roles you don’t need to provide an access_key or secret_key and the S3 client will handle this on your behalf. 
version: 1
storage_providers:
  s3:
  - id: "s3"
    endpoint: "s3.amazonaws.com"
    bucket: "cosmo"
    region: "us-east-1"
    secure: true

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Using storage providers

Once a provider is defined, you reference it by provider_id in the configuration of each feature. The following features support custom storage providers:
  • Execution config — load the router execution configuration from S3 instead of the Cosmo CDN.
  • Persisted operations — load individual persisted operations or the PQL manifest from S3.

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Best Practices

  • Create different S3 credentials for READ and WRITE to reduce the attack surface.