The video provides a practical overview of Docker networking, focusing on how to connect containers effectively, particularly addressing a viewer’s issue with accessing a service from a decentralized finance application. The presenter demonstrates creating a custom Docker network to facilitate container communication by name and explains how to connect to services across different networks.
In the video, the presenter addresses a viewer’s issue with connecting to a service called “searching” from a decentralized finance (DeFi) application. The viewer was unable to connect and the presenter aims to provide a high-level overview of Docker networking to help resolve this problem. The video is not a comprehensive tutorial on Docker networking but focuses on practical solutions for connecting containers effectively.
The presenter explains that when a Docker container is created, it is assigned an IP address and typically runs on a bridge network, which allows it to access the outside world but not be accessed directly from the host. To access a web server running in a container, such as an Nginx server, the presenter demonstrates how to expose a port using the Docker command line. By mapping a local port to the container’s port, users can access the service through their web browser.
To illustrate the networking capabilities, the presenter runs an Ubuntu container and attempts to ping the Nginx container by name, which fails due to the default bridge network’s limitations. The presenter introduces the docker inspect command as a tool to retrieve the IP address of the Nginx container, allowing for successful pings when using the IP address directly. However, the presenter emphasizes that creating a custom network can simplify container communication by allowing access by container names.
The video continues with the presenter creating a new Docker network called “myet” and connecting both the Nginx and Ubuntu containers to this network. This enables the Ubuntu container to ping the Nginx container by name. The presenter also addresses the issue of connecting to the “searching” service, explaining that it is likely on a different network. By connecting the “searching” container to the same network, the presenter demonstrates how to successfully use curl to access the service from the Ubuntu container.
Finally, the presenter encourages viewers to explore Docker networking further, mentioning that there are various types of networks available and recommending additional resources for learning. The video concludes with an invitation for viewers to ask questions in the comments or on Discord, suggesting that viewer inquiries could inspire future content. Overall, the video aims to demystify Docker networking and provide practical solutions for connecting containers.
00:00 - Start
01:01 - Chi
01:32 - New to Docker?
02:32 - reviewing a docker command
03:16 - The Default Bridge Network
03:48 - Get the container IP address
04:20 - Creating a new network
05:28 - Add Searxng to the network
05:49 - Curl from the container
06:27 - Adding Dify
06:59 - Network Chuck is awesome
07:11 - Devops and Docker Talk