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Troubleshooting Docker and Kubernetes Containers

Summary: Troubleshooting Docker

Explore Docker image concepts and build processes, review and analyze log files, inspect containers and networks, navigate container file systems both interactively and noninteractively, and clean up unused Docker resources. This lesson helps you develop practical skills to identify and resolve common issues in Docker environments efficiently.

We'll cover the following...

Introduction to Docker

In the “Docker Images Explained” lesson, we talked about Docker images. We explained that Docker images are formed through the aid of a Dockerfile. Here’s a sample of what a Dockerfile looks like:

Shell
# Use the alpine image as the base image
FROM alpine
# Set the working directory
WORKDIR /
# Copy the "hello.txt" file to the root directory
COPY hello.txt /
# Set the default command to keep the container running
CMD ["tail", "-f", "/dev/null"]

We mentioned that Docker images are built with the command below.

docker build -t <image_name> .

We defined Docker images as packages that entail everything needed to run an application, including the application dependencies and libraries. We also described Dockerfile as a template used for creating a Docker image. It has various steps that turn out to be layers when the Docker image is created. We mentioned that Docker ...