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Yatharth0045/docker-quickstart.sh

Last active August 3, 2021 17:06
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  1. Yatharth0045 revised this gist Aug 3, 2021. 1 changed file with 124 additions and 1 deletion.
    125 changes: 124 additions & 1 deletion docker-quickstart.sh
    View file
    Original file line number Diff line number Diff line change
    @@ -5,4 +5,127 @@ docker version
    docker ps

    ## Check for images | Currently, it should be empty
    docker images
    docker images

    ## Now Pull an Image (Nginx) from DockerHub
    ## SYNTAX: docker pull <image-name>
    docker pull nginx

    ## Check for the image again
    docker images

    ## Run the image to get the container
    ## FYI, nginx is a webserver use to host webpages
    ## SYNTAX: docker run [OPTIONS...] <image-name>
    docker run --name my-nginx -d nginx
    ## --name: To give a name to the container
    ## -d: Run the container in background (datach mode)

    ## Verify if container is running
    docker ps

    ## Get logs for the container
    ## SYNTAX: docker logs <container-name/id>
    docker logs my-nginx

    ## Executing a command within the container | Checking the default nginx configuration
    ## SYNTAX: docker exec <container-name/id> <cmd-to-be-executed>
    docker exec my-nginx cat /etc/nginx/conf.d/default.conf

    ## Get various container information
    ## SYNTAX: docker inspect <container-name/id>
    docker inspect my-nginx

    ## Get the default webpage of nginx container
    ## Find the container IP and open it over browser
    docker inspect my-nginx -f '{{ range.NetworkSettings.Networks }}{{ .IPAddress }}{{ end }}'
    ## -f: Used to define the Format in which we want (get value against particular key)

    ## Let's try to stop the running container
    ## SYNTAX: docker stop <container-name/id>
    docker stop my-nginx

    ## Check if container has stopped
    docker ps -a
    ## -a: Show all containers (Running and Stopped)

    ## Start the container again
    ## SYNTAX: docker start <container-name/id>
    docker start my-nginx

    ## Verify if container has started
    docker ps
    ## Show only Running containers

    ## Edit the default webpage of Nginx to some HTML page of our own by modifying the container
    ## Create your own webpage using Heredoc syntax
    cat > index.html << EOF
    <!DOCTYPE html>
    <html>
    <head>
    <title>Welcome to nginx!</title>
    <style>
    body {
    width: 35em;
    margin: 0 auto;
    font-family: Tahoma, Verdana, Arial, sans-serif;
    }
    </style>
    <body style="background-color:powderblue;">
    <center>
    <h1>This is Docker Quickstart</h1>
    <h3>This tutorial is provided by <h2>Yatharth | DevOps Engineer at Knoldus</h2></h3>
    <p> <b>Like and share</b> the blog if you found it helpful </p>
    <p> For more blogs from this Author, <a href="https://blog.knoldus.com/author/yatharth45/" target="_blank" >Click here</a></p>
    </center>
    </body>
    </html>
    EOF

    ## Copy the html file from local to the container
    ## SYNTAX: docker cp </path/to/file> <container-name/id>:</dest/path/to/file>
    docker cp index.html my-nginx:/usr/share/nginx/html/index.html

    ## Verify if nginx started rendering the updated html page | Get the container IP again and copy in the browser
    docker inspect my-nginx -f '{{ range.NetworkSettings.Networks }}{{ .IPAddress }}{{ end }}'

    ## Now save the updated container with a new image
    ## Why?? | Since containers are ephemeral, the changes we have made will be lost once the container is stopped.
    ## SYNTAx: docker commit <container-name/id> <new-image-tag>
    docker commit my-nginx my-nginx-image

    ## Check the new image
    docker images

    ## Run the new container image
    docker run --name my-new-nginx -d my-nginx-image

    ## Verify that the container is running
    docker ps

    ## Check the webpage hosted by the new nginx container | Get the IP address of the container and copy it over browser.
    docker inspect my-new-nginx -f '{{ range.NetworkSettings.Networks }}{{ .IPAddress }}{{ end }}'

    ## Rename the existing docker image to "<dockerhub-id>/<image-name>"
    ## WHY?? Because, for pushing the image to dockerhub, we need to follow the above format
    ## SYNTAX: docker tag <image-name> <dockerhub-id>/<new-image-name>
    docker tag my-nginx-image yatharth0045/my-nginx-image

    ## Login to dockerhub via docker CLI using your dockerhub creds
    docker login
    ## It will prompt for your ID and Password

    ## Push the image to dockerhub
    ## SYNTAX: docker push <dockerhub-id>/<image-name>
    docker push yatharth0045/my-nginx-image

    ## Remove the running container
    ## Way 1 | Stop the container and then remove it
    docker stop my-nginx && docker rm my-nginx
    ## Way 2 | Forcefully remove the container
    docker rm -f my-new-nginx

    ## Delete the image from local
    ## Removing multiple images
    ## SYNTAX: docker rmi <image/s>
    docker rmi nginx my-nginx-image yatharth0045/my-nginx-image
  2. Yatharth0045 created this gist Aug 3, 2021.
    8 changes: 8 additions & 0 deletions docker-quickstart.sh
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    @@ -0,0 +1,8 @@
    ## Check docker server and client version
    docker version

    ## Check for running containers | Currently, it should be empty
    docker ps

    ## Check for images | Currently, it should be empty
    docker images