Remember, the actual building and packaging of your software should be handled by your existing CI pipelines or build systems. Ctrlplane takes over from the point where your software is built and ready for distribution, solving the complex problem of managing deployments across a large and potentially diverse set of resources.

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Key Characteristics of Releases

1. Version Representation: Each release typically corresponds to a specific version of your codebase or infrastructure definition.

2. Deployment Association: Releases are created as part of a deployment in Ctrlplane. They represent the content that will be deployed across various environments and resources.

3. External Build Process: Ctrlplane does not manage the build process for releases. The actual compilation, packaging, or preparation of your software should be handled by your existing CI/CD pipelines or build systems.

4. Creation Methods: Releases can be created in two primary ways:

   • Through the Ctrlplane UI
   • Via the Ctrlplane API
   • Using a Ctrlplane integration

5. Metadata: A release often includes metadata such as version numbers, commit hashes, build timestamps, or other relevant information to identify and track the release.

6. Immutability: Once created, a release is typically considered immutable. This ensures consistency across different environments and enables reliable rollbacks if needed.

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Release Dependencies

Since Ctrlplane is meant for solving the way releases are deployed across resources, it’s very common to have version dependencies on other deployments. In the world of software, this could mean a microservice depends on a specific version of another microservice to ensure it has the required APIs.

In the case of software and infrastructure interactions, this could require a minimum version of a database that is necessary to deploy the software, or a set list of Kubernetes versions that the software supports.

To address these needs, Ctrlplane supports release dependencies. When defining a release, you can also specify which versions it depends on from other deployments. This feature allows you to:

1. Ensure Compatibility: Guarantee that your release is only deployed to environments where its dependencies are met.

2. Manage Complex Systems: Easily handle intricate relationships between different components of your system.

3. Prevent Deployment Issues: Avoid potential problems caused by incompatible versions of interdependent services or infrastructure.

4. Facilitate Upgrades: Clearly define the upgrade path for your entire system by specifying version requirements.

When creating a release, you can define expresions to determine what version of other deployments is required.

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Managing Dependencies with Resource Metadata Grouping

In most cases, a resource has multiple deployments associated with it, making it easy to verify if a specific version is deployed on that resource as required by another deployment. However, complexities arise when dependencies involve other resources, where the deployment version might be present on any of these dependent resources.

To address this, Ctrlplane uses resource metadata grouping. This mechanism allows you to logically group resources based on their metadata attributes. By doing so, Ctrlplane can accurately determine which resources to inspect to verify if the software has been deployed.

The idea is to create logical associations between resources that share common characteristics, such as being part of the same kubernetes cluster. This is particularly useful in complex infrastructures or distributed systems where deployments span multiple infrastructure components.

For example:

1. Single Cluster Deployment: If you have a single Kubernetes namespace represented by a resource, you can easily check if a version is deployed on that cluster without additional grouping if that resource is used by all the deployments.

2. Multiple Clusters Deployment: If you have multiple Kubernetes namespaces, you might need to group resources by cluster name. This way, Ctrlplane can check all namespaces within the specified cluster to determine if the required version is deployed.

By defining metadata groups and associating deployments with these groups, you ensure that version checks are performed within the relevant scope, maintaining consistency and compatibility across your system.

When defining release dependencies, carefully consider how your resources are grouped and which metadata attributes are most relevant for determining version compatibility across your system.