Cloud & DevOps
Containerization is a lightweight virtualisation technique that packages an application and all its dependencies — libraries, configuration, and runtime — into a portable, isolated container that runs consistently across any environment.
Containers share the host operating system's kernel but isolate processes and filesystems using Linux namespaces and cgroups, making them far more resource-efficient than traditional virtual machines that each carry a full OS. The core benefit is environment consistency: a container that works on a developer's laptop will behave identically in staging and production, eliminating the classic 'it works on my machine' problem. Container images are immutable and versioned, enabling precise rollbacks when a deployment goes wrong. Docker popularised containerisation for application packaging, while Kubernetes emerged as the standard platform for orchestrating containers at scale across clusters of machines.
Example
A development team packages their Python machine learning API into a Docker container with its specific CUDA, PyTorch, and dependency versions, ensuring it runs identically on every data scientist's workstation and on the production GPU cluster.
Related terms
Docker
Docker is an open-source platform that enables developers to build, package, and distribute applications as portable containers, each bundling the application code with its exact runtime environment.
Kubernetes
Kubernetes is an open-source container orchestration platform that automates the deployment, scaling, load balancing, self-healing, and management of containerised applications across clusters of machines.
CI/CD (Continuous Integration / Continuous Delivery)
CI/CD is a DevOps practice in which code changes are automatically built, tested, and deployed through a pipeline, enabling teams to deliver software updates rapidly and reliably.
Microservices
Microservices is an architectural style in which a large application is built as a collection of small, independently deployable services, each responsible for a specific business capability and communicating via APIs.
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