Docker is a software platform for building applications based on containers.There is also a huge scope of Docker Containers impacting the Desktop and Development Environment.Docker, an open source project launched in 2013, helped popularize the technology, and has helped drive the trend towards containerization.
There can be two types of applications (usually services) that you can containerise,
- Applications that run as a Background Service (like a Database, WebServer, etc)
- GUI Applications that (obviously!) run in the foreground
The second option is what we will see now,
For Running GUI application in a Docker..!!
#In our Project , we are using firefox as our GUI application.
1. Creating the Dockerfile.
- A Dockerfile is a text configuration file written using a special syntax
- It describes step-by-step instructions of all the commands you need to run to assemble a Docker Image.
create a Dockerfile with the following code:
The above Dockerfile contains the sequence of instructions to create an Centos image, runs an yum install Firefox.
FROM — Select the base image to build the new image on top of.
example : FROM centos:latest
RUN — Specify commands to make changes to your Image and subsequently the Containers started from this Image. This includes updating packages, installing software, adding users, creating an initial database, setting up certificates, etc. These are the commands you would run at the command line to install and configure your application. This is one of the most important dockerfile directives.
example: RUN yum install firefox
CMD — This is the command that will run when the Container starts.
example : CMD [“ /usr/bin/firefox”]
In our Project these CMD [“ /usr/bin/firefox”] is used to save the file.
2. Build the Docker Image
- The docker build command processes this file generating a Docker Image in your Local Image Cache, which you can then start-up using the #docker run command, or push to a permanent Image Repository.
Create the Docker Image using the following command.
#step 2 : docker build ./
(./ =It will check the Dockerfile in the root directory).
It will Perform all the 3 Commands, which we have written in Dockerfile.
Successfully Build the Docker image.
3. Check whether the image is launched.
4.Run the Docker Image.
#docker run — net=host — env=”DISPLAY” — volume=”$HOME/.Xauthority:/root/.Xauthority:rw” Imageid.
For a GUI Application to run, we need to have a XServer which is available as part of every Linux Desktop Environment, But within a Container we don’t have any XServer
Therefore, we can :
- run container with host network driver with
- share the Host’s DISPLAY environment variable to the Container
- share the Host’s XServer with the Container by creating a volume
So after executing this , we will get our GUI application (firefox).
Hence, we can run any GUI App with this same approach.
Hope , you find it Intresting..!!
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