Docker Use Case for Implementation Example

Example: Install docker on AWS or Docker itself and create an image and open the container. In the container install the apache server with the port number and show its web page. And make a Docker file and write an HTML file and show it on web page.?

Step: 1 To see the Docker version
The command is sudo docker –version

Here is the docker new version which we are working on it.

Step: 2 To create the image

The command is sudo docker pull <image name>

This command is starting pulling the image which images already exist in Docker Hub.
Here I pulled two images from Docker Hub one is ubuntu and another one is MySQL

We can see two images are downloaded successfully.

Step: 3 To see the images.
The command is sudo docker images (By this command we can see the images)

Here it shows my images. So, we successfully created images. With image ID, size, and created time.

Step:4 Now run any one of the images to create the container.
Command is sudo docker run -it -d <image id>

Here we created two containers of two images.

Step: 5 To see whether the container is working or not.
The command is sudo docker ps (This command shows the working containers).

Here we can see the two containers with container id.

Step: 6 To see all the containers.
The command is sudo docker ps -a (This command shows all the containers).

Step: 7 To open the containers to do several changes like install any type of server.
Command is sudo docker exec -it <container id> bash

Now we are at the root.

Step: 8 Update the container.
The command is apt-get update

Successfully updated the container now we can do any changes.

Step:9 Now let’s install the apache server in the container.
The command is apt-get install apache2

It started installing the apache server.

Apache server is successfully installed here.

Step: 10 To see the status of the server.
The command is service apache2 status

It says the apache server is not running. So, we have to start the server.

Step: 11 To start the server
The command is service apache2 start

See now the apache server is running over the container. Exit from the container for that write exit and press the enter button. So, we get back to ubuntu.

Step: 12 Now save the changes in the container.
Command is sudo docker commit <container id> <new name>

We successfully saved the changes.

In the above command, we gave . The new name became another image. And Container.

Step: 13 Let’s see whether a new image is created or not.
Command sudo docker images.

See I gave the new name DevOps/apache in the command.

In the images, DevOps/apache images are created. And observe one thing in the above images list ubuntu is of 72.9Mb but the image DevOps/apache is 213Mb. Because there is an apache server in it.

Step: 14 Let’s run the image DevOps/apache.
Command is sudo docker run -it -d <imageid>

DevOps/apache image is working.

Step: 15 sudo docker ps.

Here we can see the DevOps/apache container is also working.

Step: 16 Let’s open the apache server on port number 82:80. Because the apache server is opened only on port number 80.
Command is sudo docker run -it -p 82:80 -d devops/apache