Docker:

Docker is a platform and tool that enables you to develop, deploy, and run applications inside containers.

Containers are lightweight, standalone, and executable software packages that include everything needed to run a piece of software, including the code, runtime, system tools, system libraries, and settings.

Container contains:

1. Application/webserver Software

2. Minimal OS

3. Dependency Libraries and Binaries

4. Application Code

5. Supported configuration data

You can see Docker architecture in below picture:

Docker installation

• Create a new ec2 instance. I have used Amazon-Linux-image as AMI and my instance name is: builder-server

  

• Install docker over there

  command to install docker : yum install docker -y

  

• check the docker service status

  

• Start docker service

  

📌Tasks

1. As you have already installed Docker through the above steps, now is the time to run Docker commands.

   • Use the docker run command to start a new container and interact with it through the command line.

     docker run hello-world

     

   • Use the docker inspect command to view detailed information about a container or image.

-To see all the running containers the command is: docker ps -a

-We can use the inspect command to get low-level configuration information about various Docker objects like images, containers, volumes, networks, nodes, etc.
To see, for example, on which node a container is deployed or what ports it listens to.

• Use the docker port command to list the port mappings for a container.

  

• Use the docker stats command to view resource usage statistics for one or more containers.

  docker stats command is used to see live stream a container's runtime metrics*. The command supports CPU, memory usage, memory limit, and network IO metrics.*

  

• Use the docker top command to view the processes running inside a container.
  docker top <container ID > command allows users to display the ps output for the main process of a given container ID or name.

  

• Use the docker save command to save an image to a tar archive.

      docker save -o OUTPUT_FILE IMAGE_NAME:TAG
  

  

• Use the docker load command to load an image from a tar archive.

     docker load --input fedora.tar
  
    Loaded image: fedora:rawhide
    Loaded image: fedora:20
  

These tasks involve simple operations that can be used to manage images and containers.