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DevOps Intermediate

What is Docker?

A platform for building, shipping, and running applications in lightweight, isolated containers.

Docker packages applications and their dependencies into containers — standardized units that run consistently across any environment. Unlike virtual machines, containers share the host OS kernel, making them lightweight and fast.

Key concepts include Dockerfiles (build instructions), images (templates), containers (running instances), volumes (persistent storage), and Docker Compose (multi-container apps).

Related Terms

YAML
A human-readable data serialization language commonly used for configuration files in DevOps tools and applications.
Artifact
A packaged, versioned output of a build process — such as a Docker image, JAR file, or compiled binary — ready for deployment.
Kubernetes ConfigMap
A Kubernetes object that stores non-sensitive configuration data as key-value pairs, injected into pods as environment variables or files.
Kubernetes
An open-source container orchestration platform that automates deploying, scaling, and managing containerized applications.
Health Check
An endpoint or mechanism that reports whether an application is running correctly and ready to handle requests.
Monitoring
The practice of collecting, analyzing, and alerting on system metrics and logs to ensure application health and performance.
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