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Docker Basics for QA

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7.1🔒Why Docker Matters for QATest environments are increasingly containerized. Docker provides isolated, reproducible environments that work the same on your laptop, in…44 words

7.2🔒Core ConceptsAn image is a snapshot of a filesystem and configuration. A container is a running instance of an image. You can run multiple containers…138 words

7.3🔒Running Containers16 words

7.4🔒Common QA Containers7 words

7.5🔒Docker Compose for Test EnvironmentsDocker Compose lets you define multi-container environments in a YAML file. This is the standard way to manage test environments that…75 words

7.6🔒Docker Troubleshooting for QAPro Tip: Run docker system df periodically to check how much disk space Docker is using. On CI runners, Docker images and volumes…192 words

7.7🔒Docker in CI/CDMost CI platforms support Docker natively. GitHub Actions uses the services keyword:42 words

7.8🔒Exercises60. Run a PostgreSQL container and connect to it with psql via docker exec. 61. Run a Redis container, then use docker exec to connect with…187 words

7.9🔒Career Translation- Designed and maintained Docker Compose-based test environments with PostgreSQL, Redis, and mock services, enabling fully isolated…418 words

7.10🔒Q&AInterview Depth CheckPrompt: Your integration tests intermittently fail with "connection refused" when connecting to the PostgreSQL container, even though…1157 words