blaze-b / docker

Docker

Website: https://www.docker.com/

Documents: https://docs.docker.com/

1. Carves up a computer into a sealed containers that run your code.
2. Gets the code to and from your computer
3. It builds a containers for you
4. It is social platform to find and share containers, which are different from virtual machines.

Container

Hyper -V Container for creating linux containers

1. It is self contained sealed unit of software
2. Contains everyting required to run the code.
3. Includes batteries and OS
4. It includes: a) Codes b) Configs c) Processes d) Networking e) Dependencies

Docker Container

1. A client program
2. A server program that manages a linux system.
3. A program that builds container from code.
4. A service that distributes containers
5. A company that makes containers

Commands

1. Command : docker run hello-world --Command to Check whether docker is working fine

   Output : Unable to find image 'hello-world:latest' locally latest: Pulling from library/hello-world 1b930d010525: Pull complete Digest: sha256:9572f7cdcee8591948c2963463447a53466950b3fc15a247fcad1917ca215a2f Status: Downloaded newer image for hello-world:latest

           Hello from Docker!
           This message shows that your installation appears to be working correctly.
   
           To generate this message, Docker took the following steps:
           1. The Docker client contacted the Docker daemon.
           2. The Docker daemon pulled the "hello-world" image from the Docker Hub.
              (amd64)
           3. The Docker daemon created a new container from that image which runs the
              executable that produces the output you are currently reading.
           4. The Docker daemon streamed that output to the Docker client, which sent it
              to your terminal.
   
           To try something more ambitious, you can run an Ubuntu container with:
           $ docker run -it ubuntu bash
   
           Share images, automate workflows, and more with a free Docker ID:
           https://hub.docker.com/
   
           For more examples and ideas, visit:
           https://docs.docker.com/get-started/
   

2. Command: docker info --The above command gives the server side info about the docker

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Docker Flow

1. Images

   Command: docker images/docker image ls

   Output: REPOSITORY:hello-world

            TAG:latest                 
            
            IMAGE ID:fce289e99eb9            
            
            CREATED:13 months ago             
            
            SIZE:1.84kB
   

2. Running Container-->

Command to run the container: docker run -ti <REPOSITORY_NAME>:<TAG> eg: docker run -ti hello-world:latest bash /ti -- terminal Interactive

Command to list the Container: docker container ls / docker ps

3. Stopped Container-->

Command for a stopped Conatainer: docker ps -l --format=$FORMAT

Output: CONTAINER ID :d90360cc6dd4

    IMAGE: hello-world
     
    COMMAND: "/hello"          
     
    CREATED: 2 hours ago   
     
    STATUS: Exited (0) 2 hours ago
     
    PORTS:                 
     
    NAMES: great_wescoff

4. Commiting Container-->

Commiting and creating a new image:

1. docker commit e758f9fd8b12 -- e758f9fd8b12/Container id --OUTPUT:sha256:a16eeff5f29036c1c6e320258105087946e9e0716edb27afc5d5c521e59208e1
2. docker tag sha256:a16eeff5f29036c1c6e320258105087946e9e0716edb27afc5d5c521e59208e1 my-image -- Renaming the image

Another Way of commiting an image:

1. docker commit 9b2d94a18f04 my-immage2
2. docker-images

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docker run

1. Containers have a main purpose
2. The containers stop when the process stops
3. Conatainers have names