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CKA Practice: Upgrade Multi-Node Kubernetes Cluster
This exercise tests your ability to safely upgrade a multi-node Kubernetes cluster from version 1.30 to 1.31 following the standard upgrade procedure.
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This exercise tests your ability to safely upgrade a multi-node Kubernetes cluster from version 1.30 to 1.31 following the standard upgrade procedure.
Test your Linux and Networking skills by identifying which port a service is using. Sounds easy? Perhaps, but be careful - you only get one shot!
Test your Linux and Networking skills by pinpointing a process that is listening on a given port. Sounds easy? Perhaps, but be careful - you only get one shot!
Can you resolve issues with a Node.js container's termination process to ensure graceful shutdown on 'docker stop'?
This exercise tests your ability to configure kubernetes network policies to make sure only pods with specific labels can communicate with each other.
Learn how to perform one of the most basic Docker operations - build and publish a container image.
Learn how to leverage Docker to copy a container image from one repository to another.
Prove your SRE skills - deploy a resource-greedy application to a Kubernetes cluster and make it run for a while without disrupting the service.
Start a Linux process and limit its CPU and memory usage with cgroups.
Learn how to use Docker Scout to analyze and remediate vulnerabilities in a container image.
Learn how to start using Dagger in your project. Practice by creating your first Dagger module and adding some functions to it.
In this simple challenge, you will learn how to install the Dagger CLI on a Linux machine with Docker already running.
Practice copying files to/from running Kubernetes Pods to become a Kubernetes troubleshooting ninja.
Practice copying files to/from running containers to become a container troubleshooting wizard.
Practice your container debugging skills by editing a file in a running container.
Learn how to send a signal to an application running as a Kubernetes pod.
Explore how nerdctl tries to look like Docker when it comes to UX. Are containers started with nerdctl any different from those started with Docker š³?
Start a container using an alternative container runtime - Podman. Shouldn't be too hard if you already know how to start a container with Docker š³
Perform the most fundamental Docker operation - start a container. Sounds too easy? Be ready to also answer a few tricky questions about it!
Prove your networking skills by mapping one network address to another using socat.
Learn how to create fully isolated virtual network environment using Linux network namespaces.
Learn how to label container images using the ctr command.
Learn how to pull container images from different registries using the ctr command.
Learn how to tag and push container images to a remote registry using the ctr command.
Learn how to work with containerd namespaces using the ctr command-line client.