In the same way, a sidecar service shares the fate of its parent application.
On a motorcycle, the sidecar is attached to one motorcycle, and each motorcycle can have its own sidecar. Sidecars are supporting processes or services that are deployed with the primary application. It goes wherever the parent application goes.
SolutionĬo-locate a cohesive set of tasks with the primary application, but place them inside their own process or container, providing a homogeneous interface for platform services across languages.Ī sidecar service is not necessarily part of the application, but is connected to it. Managing the code and dependencies for these language-specific interfaces can also add considerable complexity, especially for hosting, deployment, and management. In addition, deploying these features as separate services can add latency to the application. While this gives more flexibility, it means that each component has its own dependencies and requires language-specific libraries to access the underlying platform and any resources shared with the parent application. If the application is decomposed into services, then each service can be built using different languages and technologies. As a result, the component and the application have close interdependence on each other. Also, they usually need to be implemented using the same language as the parent application. However, this also means they are not well isolated, and an outage in one of these components can affect other components or the entire application. If they are tightly integrated into the application, they can run in the same process as the application, making efficient use of shared resources. These peripheral tasks can be implemented as separate components or services. Context and problemĪpplications and services often require related functionality, such as monitoring, logging, configuration, and networking services. The sidecar pattern is sometimes referred to as the sidekick pattern and is a decomposition pattern. The sidecar also shares the same lifecycle as the parent application, being created and retired alongside the parent. In the pattern, the sidecar is attached to a parent application and provides supporting features for the application. This pattern is named Sidecar because it resembles a sidecar attached to a motorcycle. This pattern can also enable applications to be composed of heterogeneous components and technologies. Deploy components of an application into a separate process or container to provide isolation and encapsulation.
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