Reference
- https://www.devopsschool.com/blog/example-and-sample-programs-of-dockerfile/
- https://www.devopsschool.com/blog/understanding-dockerfiles-instructions-options-of-docker/
- https://www.devopsschool.com/blog/dockerfile-lab-exercise-1/
- https://www.devopsschool.com/blog/how-to-create-a-image-using-dockerfile/













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