There are many way where you can create a Docker Image and make a container of it, but using Dockerfile
is an easy way. Let's create an Apache Server Image using this method.
In this method we are going to follow below steps:
- First choose a
__base_image__
. In our case, base image isUbuntu
. - Execute some commands while building the image. Actually it doesn't build whole new image it converts base image into Apache server image.
Okay, create a new folder and give whatever name you want to give it. I am giving it myapache
and switching into it.
$ mkdir myapache
$ cd myapache
Create a new file named asDockerfile
(not mandatory to use the same name). Add below commands into it.
FROM ubuntu
RUN "apt-get update"
RUN "apt-get install apache2 -y"
Let's breakdown these instructions step by step. First line says that we are using Ubuntu as __base_image__
.
Second and third line says to run the given commands. apt-get update
will install the latest version of packages currently installed on user's system. Next command will install Apache server on the __base_image__
.
Here -y
suggests automatic yes for any prompts in between the installing process.
Now using this Dockerfile
let's build a docker image.
$ docker image build -t myapache .
You don't need to remember above command it is already present, docker image --help
will help you. myapache is the name of the image.
One thing that i want to clarify that .
is for the path of Dockerfile
. I am currently in the same directory that's why i used put that.
So above command will build the docker image using our Dockerfile
. It will run that instructions step by step.
$ docker image ls
Type above command and you will see that myapache image is listed there. That confirms that our image is created successfully.
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