Welcome readers, in this tutorial, we will discuss how to get an IP address assigned to a running docker container.
1. Introduction to Docker
In the present world, Docker is an important term,
- Often used in CI/CD platform that packages and runs the application with its dependencies inside a container
- Is a standard for Linux Containers
- A Container is a runtime that runs under any Linux kernel and provides a private machine-like space under Linux
1.1 Docker Terminology
- Image: Representation of Docker container i.e. a JAR or WAR file in Java
- Container: Runtime of Docker i.e. a deployed and running Docker image. For example, an executable Spring Boot jar
- Engine: The code that manages, creates and runs the Docker containers
- Hub: A public developers registry to distribute their code
- Repository: A collection of Docker related images i.e. different versions of the same application
1.2 Docker Command Basics
Here’s an example command.
1.3 Need for using Docker
- For environment replication, while the code runs locally on the machine
- For numerous deployment phases i.e. Dev/Test/QA
- For version control and distributing the application’s OS within a team
1.4 Setting up Docker
If someone needs to go through the Docker installation, please watch this video.
To start with this tutorial, we are hoping that users at present have the Docker installed on a Windows operating system.
2. How to get the Docker Container IP address
The docker inspect command is used to get the low-level information such as Network settings, Config, Image, Mounts, etc. about the Docker Container in a JSON format. Below is the command syntax –
docker inspect <Option> <container_name | container_id>
To get the information about the Docker Container we need to make sure that the Docker Container(s) is up and running. To list this information, we can use the docker ps command as shown in Fig. 2.
2.1 Get Docker Container IP Address
To fetch the IP address for all the running containers we can use the following command –
docker ps -aq | xargs docker inspect -f '{{.Name}} - {{.NetworkSettings.IPAddress }}'
This command lists down the IP address of all the running docker containers as shown in Fig. 3.
Try out these commands in your development environment to practice and learn.
3. Conclusion
That is all for this tutorial and I hope the tutorial will help you understand the basic commands to get the IP address for a Docker container. Happy Learning and do not forget to share!
4. Download the source code
You can download the full source code of this example here: How to get the Docker container IP address
