What is Container Design Pattern?In the emerging era of technology, the cloud plays a crucial role. Application deployment becomes easy with the use of containers. Kubernetes is playing a vital role in the deployment and scaling of applications. As we know, applications run in the containerized form on Kubernetes, and these containers reside inside the pod. But there are some situations where containerized applications need additional features to enhance their efficiency. Using the various container design patterns, we can improve an application’s efficiency. These designing patterns are useful while talking about applications' architecture and preventing application architecture changes during any testing process.
Cloud applications can keep businesses moving forward, even in this pandemic, people have been able to shop, connect with friends and, of course, work from home. Source- Containers And Kubernetes May Be The Edge You Need To Keep Moving Forward
The deployment process of an application includes several steps. The whole process has been simplified with the containerization approach. Containers are helpful to move an application for deployment in different environments quickly. The container design patterns are introduced to make an application more utilizable and a container reusable. These patterns help solve application deployment's common problems and complete an application more stable by following a defined architecture.
What are the types of Container Design Patterns for Kubernetes?In general, the container design patterns are useful for a specific purpose in Kubernetes. It is unnecessary to combine the containers in a pod, but it is essential to understand which pattern is suitable for a particular problem.
Single-Container PatternThe single-container pattern means deploying an application by putting it inside a container. This is a simple pattern from where the journey of a container starts. In this case, the container should contain only one responsibility. The containers can be used for various things. During runtime, the container's behavior can be changed by using the docker commands. If we want to add some dependencies in a container as per our requirement, we can use that container's base image.
Sidecar PatternThis pattern is used to extend the behavior of a container. In this pattern, the sidecar container is attached to a parent application container. The Sidecar Pattern provides supporting features to the main application. The lifecycle of the sidecar is the same as the parent application. The application container performs the primary task, and the sidecar extends its functionality by performing the secondary tasks. It describes how to enhance a primary container's functionality without changing it. This pattern is suitable when the difference between the primary and secondary studies is clearly defined.
Ambassador PatternThis pattern is suitable for running additional services with our main container. Ambassador Pattern's primary goal is to simplify the main container’s access to other services. In simple words, the application container can invoke the ambassador container, which acts as a service discovery layer. The ambassador container contains all external services configuration with the main application using the localhost service. This container connects to the service to keep the connection open and reconnect when something unexpected happens.
Adapter PatternThe adapter container pattern is suitable when we want to keep the communication between containers consistent. It generally transforms the primary container's output into the output that fits our applications’ standards. For example, an adaptor container can expose our application's monitoring interface even though it does not implement it in a standard way. In Adapter Pattern, we can easily replace the existing container without affecting the application container because of just the configuration changes. This container's main benefit is that the adapter pattern enables a container to reuse a common system problem.
Container Storage Interface is an initiative to combine the storage interface of Container Orchestrator Systems that combined with storage vendors like Ceph, Net App. Source- Container Storage Interface (CSI) for Kubernetes