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LAB02-DockerVolume.md

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LAB-02: Binding Volume to the Different Containers

This scenario shows the Docker-Volume functionality.

  • Firstly, a new volume "test" will be created and connected to the Nginx container directory ("mywebserver"). Content will be synchronized.
  • Files content ("index.html") will be changed after entering into the container.
  • First container ("mywebserver") will be stopped and removed. Volume ("test") still remains.
  • Second container ("mywebserver2") will be created without binding volume to show the default page. The second container will be stopped and removed.
  • Third container ("mywebserver3") will be created with binding "test" volume. Content of container and volume ("test") will be synchronized.

Steps:

  • Create a directory (“Webpage”) on your Desktop.
  • Create a file ("index.html" in "Webpage" directory) that contains the following:
<center>
<h1>Welcome to My Web Site</h1>
</center>
  • Open terminal and run:
docker volume create test
  • Create a nginx container and bind to volume (-d:detach/running on background, -p:port binding [hostPort]:[containerPort], -v: volume binding [volumeName]:[dockerDirectoryPath]):
docker container run --name mywebserver -d -p 80:80 -v test:/usr/share/nginx/html nginx
  • Enter into the container:
docker container exec -it mywebserver sh
ls
  • In the container, go to the content directory:
cd /usr/share/nginx/html
ls
  • To install "nano" application, update and install nano, in the following order:
apt-get update
apt-get install vim nano -y
  • Open "index.html" and change "Welcome to My Web Site" to "Welcome to My Web Site, This is written using First Container"
nano index.html
  • Open a browser to see the result.
  • Press "CTRL+P+Q" to go out from container to host.
  • Remove the first container and be sure whether it is removed or not:
docker container rm -f mywebserver
docker container ls -a
  • Create an Nginx container without binding to the volume:
docker container run --name mywebserver2 -d -p 80:80 nginx
  • Open the browser to see the result (default Nginx page)
  • Remove the second container and be sure whether it is removed or not:
docker container rm -f mywebserver2
docker container ls -a
  • Create an Nginx container with binding to the volume:
docker container run --name mywebserver3 -d -p 80:80 -v test:/usr/share/nginx/html nginx
  • Open the browser to see the result (volume syncs with the last container)
  • Remove the third container and be sure whether it is removed or not:
docker container rm -f mywebserver3
docker container ls -a

LAB-02.1: Mount Binding to the Different Containers

  • If you are using Docker Desktop Windows/Mac, go to Docker Desktop Configuration Settings from app /Resources/FileSharing, add your root directory (e.g. C:/).

image

  • Similar to the Docker-Volume object, but now the host PC's file path directory is used to bind the container's file path. Hence, while developing/testing your application, you can change the content instantly. When host directory content is updated, the container directory is also updated right away, and vice-versa.
  • Create a directory (“Webpage”) on your Desktop.
  • Create a file ("index.html" in "Webpage" directory) that contains the following:
<center>
<h1>Welcome to My Web Site</h1>
</center>

docker container run --name mywebserver -d -p 80:80 -v C:\Docker\Webpage:/usr/share/nginx/html nginx
  • Open the browser to see the result (you will see the content of the host directory). Change the content of the host directory ('index.html') to see the changes.

image