Docker/C3/Docker-Networking/English

Visual Cue	Narration
Show Slide: Title Slide	Hello and welcome to the Spoken Tutorial on “Docker Networking”.
Show Slide: Learning Objectives	In this tutorial, we will learn about: Fundamentals of Docker networking. Connecting containers and establishing communication links. Configuring port exposure and service exposure. Deleting docker network
Show Slide: System Requirements	To record this tutorial, I am using Ubuntu Linux OS version 22.04 Docker version 27.0.2
Show Slide: Prerequisite	To follow this tutorial, You must have basic knowledge of using Linux terminal For pre-requisite Linux tutorials, please visit this website
Show Slide: Fundamentals of Docker networking	Docker networking involves various components and configurations Docker uses network namespaces to isolate network resources. Docker facilitates this through network links and service discovery mechanisms
Show Slide: Types of Docker networks	Docker provides several types of networks: Bridge Network:It is the default network type Host Network: The Containers share the host’s network stack Overlay Network: It enables communication between containers Macvlan Network: It assigns a MAC address to each container, making it appear as a physical device None Network: It disables networking for the container
	In this tutorial we will demonstrate how to use Bridge Network.
Open Linux terminal Create a Docker network Type command docker network create newnetwork in terminal Highlight network id	Open your terminal. Let us first create a docker network. To create a docker network Type docker space network space create space newnetwork and press Enter Here, newnetwork is the name of the network. We can see a network id as output related to the created network.
Type command docker network ls	To view all the docker network, type the command docker network ls Here you can see all the docker networks with newnetwork
Terminal Command: Highlight container id	Next, let's connect containers. We will be using a nginx docker image. We'll start a container and connect it to the network using the command as shown. This command runs a container named container1 and connects it to newnetwork.
Terminal Command: Highlight container id	Similarly, let us run another container named container2 with curlimages/curl image Type the command as shown. Here the nginx container is serving as the server And we will use the curl container to act as the client Now, both containers are connected to the same network. They can communicate with each other.
Terminal Command: Highlight response	To check the connectivity between containers, we use the command, as shown. The containers will return a webpage response. The response will contain nginx welcome page in html format
Only narration.	Now, let's learn about exposing ports. Ports expose Docker container services to the host or other networks
Terminal Command: docker run -d -p 8080:80 nginx	For example, to bind port 8080 on your host to port 80 in the container, use docker space run space hyphen d space hyphen p space 8080:80 space nginx and press Enter This command exposes port 80 of the container nginx to port 8080 on the host. Now, service is running on port 80 within the container. We can access this via port 8080 on the host machine
Open Firefox browser. Type the URL http://localhost:8080	Now let us view the running nginx web server. Open the web browser and type the url http://localhost:8080
The nginx welcome page will open	This is the welcome page for nginx web server.
Terminal Command docker network ls All the docker network with network id will appear	Switching back to the terminal. Let us see how to delete a created network. Type docker space network space ls Here we can see all the docker networks
docker network rm <NETWORK_ID>	To remove the network we will use the remove command with network id. Let us remove the third network from the list. copy the network_id Type docker space network space rm and paste the id.
Error appears	This error appears because some containers are using the newnetwork To fix this error we have to first stop all the containers using the network newnetwork
docker ps -q --filter "network=newnetwork" | xargs docker stop	To stop all the containers under the same network. Type the command as shown. It displays the container id that are stopped which used newnetwork as network
Type docker space network space rm and paste the id.	Now we can remove the network. Type docker network ls To remove the network we will use the remove command with network id. Let us remove the third network from the list. copy the network id Type docker space network space rm and paste the id. The network newnetwork is successfully removed with network id as shown.
docker network prune A warning will appear WARNING! This will remove all custom networks not used by at least one container. Are you sure you want to continue? [y/N]	You can also remove all the unused docker network at once. For that type docker space network space prune A warning will appear. Type y and press Enter to continue removing the docker networks
Clicking on terminal close button	Close the terminal window.
Show Slide: Summary	This brings us to the end of this tutorial. Let us summarize. In this tutorial, we learnt about Fundamentals of Docker networking Connecting containers and establishing communication links Configuring port exposure and service exposure Deleting docker network
Show Slide: About Spoken Tutorial project	The video at the following link summarizes the Spoken Tutorial project. Please download and watch it
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Slide: Acknowledgement	Spoken Tutorial Project was established by the Ministry of Education, Government of India.
Show slide: Thank You	This is Aditya Kushwaha, a FOSSEE Semester long intern 2024, IIT Bombay, signing off. Thanks for joining.

Contributors and Content Editors

Madhurig, Nirmala Venkat