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What is FROM in Docker File?
FROM tells which base you would like to use for creating your docker image.
Since we are using Centos:7, it's mentioned there. We can use other OS like centos:6, ubuntu:16.04, ubuntu etc

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What is MAINTAINER in Docker File?
Both fields MAINTAINER & LABEL Remarks are called labels.
They are used to pass information like the Maintainer of the docker image, Version number, purpose, or some other remarks.
We can add a number of labels but it's recommended to avoid unnecessary labels.

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What is RUN command in Docker File?
Now RUN command is responsible for installing or changing the docker image as we see fit.
Here we have asked RUN to update our system & then install apache on it.
We can also ask it to create a directory or to install some other packages.

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https://www.whizlabs.com/blog/wp-content/uploads/2019/08/Docker_Architecture.png

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What is WORKDIR in Docker File?
With WORKDIR, we can set a working directory for the docker image. Here it has been set to /root.
Eg: WORKDIR /root

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What is ENTRYPOINT & CMD in Docker File?
ENTRYPOINT & CMD are both used to define an executable that should run once docker is up.
On ENTRYPOINT, we define an executable & with CMD, we define additional parameters that are required for ENTRYPOINT.
Like here, we have used ping with ENTRYPOINT but it requires an additional parameter, which we provided with CMD.
CMD: Can be overwritten | ENTRYPOINT: Can't be overwritten

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What is Docker Hub?
Docker images create docker containers. There has to be a registry where these docker images live.
This registry is Docker Hub. Users can pick up images from Docker Hub and use them to create customized images and containers.
Currently, the Docker Hub is the world’s largest public repository of image containers.

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Tell us something about Docker Compose.
Docker Compose is a YAML file which contains details about the services, networks, and volumes for setting up the Docker application.
So, you can use Docker Compose to create separate containers, host them and get them to communicate with each other.
Each container will expose a port for communicating with other containers.

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What is Docker Swarm?
You are expected to have worked with Docker Swarm as it’s an important concept of Docker.
Docker Swarm is native clustering for Docker.
It turns a pool of Docker hosts into a single, virtual Docker host.
Docker Swarm serves the standard Docker API, any tool that already communicates with a Docker daemon can use Swarm to transparently scale to multiple hosts.

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https://maximorlov.com/images/docker-communication.png

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What is Agent Directive in Jenkins?
Answer: The Agent is the section that specifies the execution point for the entire pipeline or
any specific stage in the pipeline. This section is being specified at the top-level inside the
pipeline block.