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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

Feature Flag
A technique that allows enabling or disabling features in production without deploying new code, enabling safe rollouts and A/B testing.
Message Queue
A communication mechanism that enables asynchronous message passing between services, decoupling producers from consumers.
Runbook
A documented set of standardized procedures for handling routine operations and incident response in production systems.
Ansible
An agentless automation tool for configuration management, application deployment, and task automation using YAML playbooks.
Kubernetes Secret
A Kubernetes object for storing sensitive data like passwords, tokens, and certificates, with base64 encoding and optional encryption at rest.
Environment Variable
A dynamic value stored outside the application code that configures behavior without hardcoding sensitive or environment-specific data.
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