Docker - Ubuntu - bash: ping: command not found [closed]

TLDR

If you see bash: ping: command not found in an Ubuntu-based Docker container, install the iputils-ping package using apt-get install.

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The ping command is often used to test network connectivity, but it may not be available in minimal Ubuntu-based Docker images. This guide explains how to resolve the issue and why it happens.

Why Is ping Missing?

Minimal Docker images, like ubuntu:latest, exclude many utilities to keep the image size small. The ping command is part of the iputils-ping package, which is not installed by default.

Installing ping in a Docker Container

To install ping, you need to update the package list and install the iputils-ping package:

# Start a shell in the container
docker exec -it <container_name_or_id> bash

# Update package list
apt-get update

# Install iputils-ping
apt-get install -y iputils-ping

Now you can use the ping command inside the container.

Making the Change Persistent

If you frequently need ping in your containers, add it to your Dockerfile:

FROM ubuntu:latest
RUN apt-get update && apt-get install -y iputils-ping

Build the image:

docker build -t ubuntu-with-ping .

This way, every time you run a container from this image, ping will be available. For example:

docker run --rm -it ubuntu-with-ping bash

You can now use ping without any issues.

Best Practices

• Use minimal images for production to reduce attack surface.
• Only install tools like ping when needed for debugging or testing.
• Document any manual changes to containers.

By following these steps, you can quickly resolve the ping: command not found error and ensure your containers have the tools you need.

Good luck with your project!