A container is a standardized unit of software that bundles code and all its dependencies. This allows it to run applications consistently and portably across different environments. Unlike virtual machines, multiple containers share a single operating system kernel, which allows them to use resources more efficiently. They operate similarly to virtual machines but offer a leaner solution. To achieve this, they simply create a new user address space for each application, thereby providing an isolated environment.
They ensure the separation and management of resources used on a machine, including code, runtime modules, system tools, and system libraries. Due to their independence from the environment, they enable efficient deployment, scalability, and management of applications, which facilitates the rollout of new applications and releases.
Containers are efficient because they utilize the host system’s kernel. As a result, they start faster and consume fewer resources. In contrast, traditional virtual machines (VMs) require their own kernel for each instance.
Unlike traditional virtualization, where each VM requires its own operating system instance, containers share the host’s kernel. This makes them more resource-efficient and faster to start.
Containers offer significant advantages such as efficient resource utilization, portability across different environments, and rapid deployment. This makes them particularly attractive for use in modern IT architectures such as microservices and DevOps.
A typical example is the development and deployment of an application across different environments. Containers significantly simplify this process as they contain all necessary dependencies and function independently of the host system. Another example is their use in CI/CD pipelines, where they increase consistency and efficiency in the development process.
With the growing number of containers, management and orchestration tools such as Kubernetes and Docker Swarm are essential. These platforms make it possible to efficiently manage, scale, and monitor containers across multiple hosts.
Kubernetes, or K8s for short, was developed by Google. Today, it is the most well-known platform for container orchestration. It enables automated deployment, scaling, and management of containerized applications and is ideal for use in production environments.
