Creating a Docker image using Dockerfile and Launch Container

Create directory for Dockerfile

Create Docker file, Name should be Dockerfile

#Start with an #Ubuntu base image
FROM ubuntu

#Add metadata with a Name Label
LABEL Name="Dinesh"

#Update packages and Install Apache2
RUN apt-get update && apt-get install apache2 -y

vi Dockerfile

Build the Docker Image :

docker build -t myimage:v1.0 .

• docker build: Invokes Docker's build process.

• -t myimage:v1.0: Tags the resulting image with the name myimage and version v1.0.

• .: Uses the current directory as the build context, meaning it looks for a Dockerfile in the current directory to build the image.

Verify the Image Creation :

docker images

Now, i need to install vim & git in inside docker image.

We have two option, one for build new image with new Dockerfile. Another one, build new image from existing image myimage:v1.0 , Now, i will create new image from existing image.

Need add image name in FROM existing Docker image with tag & Which things need to install (like, vim,git) add in RUN line

vi Dockerfile

Now, Build the new Docker Image > Need to change Image name or Tag for new image.

I have changed tag v2.0

docker build -t myimage:v2.0 .

Verify the Image Creation :

docker images

Launching a Docker Container using Docker Image:

Already, we have created two images, i will use this docker image myimage:v2.0 for launch docker container

Step 1 : Verify the Available Docker Images

docker images

Step 2: Launching a Docker Container

docker run -itd -p "8080:80" myimage:v2.0

• docker run: Runs a new container from a specified image.

• -it: Runs the container in interactive mode with a terminal (though the -d flag will detach it, so -it is not necessary here).

• -d: Runs the container in detached mode (in the background).

• -p "8080:80": Maps port 80 inside the container to port 8080 on the host machine.

• myimage:v2.0: Specifies the image to use for the container, with the tag v2.0.

Step 3: Verify the Running Container

docker ps