Question-26:  What is the use of Dickerfile?

Answer: A Dockerfile can be used to automate the creation or building of a Docker container image.

Question-27: What is .dockerignore file?

Answer: This .dockerigonre defines the set of files that should be ignored when copying files into the image.

Question-28: Which are the two main files when you create a Docker Image?

Answer: There are following two files which is required when you what to create Docker Container

• Dockerfile: You can say this a recipe to create a Docker Container.
• .dockerignore: This would define what all files to be ignored while copying file to container.

Question-29: As you know, every Docker image is built on another Docker image, which attriubute in Dockerfile you use for base container?

Answer: “FROM” attribute. Example as below

FROM node:11

Here, it is specifying that get the preconfigured container from Docker Hub which has Node.js 11 already installed.

Question-30: Can you please explain the few main attributes of Dockerfile?

Answer: Below are the main attributes in the Dockerfile, which you come across many times

• WORKDIR: You can specify the directory inside the container image, where all the command would run.
• COPY: Copy the files.
• RUN: Run the command in the container.
• CMD: This specify the default command when you start the container.
• FROM: What should be the base image for a container.