Devops Tools - With Shubham Londhe

Docker - (01) - Day 33

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ALI MASIU ZAMA
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Table of contents

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

๐Ÿ“ŒTasks

  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.

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          docker save -o OUTPUT_FILE IMAGE_NAME:TAG

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

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         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.

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