Gain insights into container fundamentals, delve into Docker and Kubernetes, learn about managing clusters, explore fixing network errors, and discover creating robust container infrastructure.

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Troubleshoot

Containers help applications easily be packaged and shipped to any environment. Two of the most popular container tools are Docker and Kubernetes. Depending on their utilization, containers can experience image build, pods and node failures, and communication issues. This course will help you learn how to handle those issues.

This course teaches you what containers are and why they were adopted. You’ll explore Docker images, review log files in Docker, inspect containers, and clean resources while learning to fix issues with Docker image builds and resolving Docker container network errors. Then, you’ll get an overview of Kubernetes, how to manage a cluster and resolve reliability issues, and how to fix pod, network, container, configuration, and ingress issues. Finally, you’ll create a robust container infrastructure.

By the end of this course, you’ll also have a strong grasp on approaching and handling container issues and troubleshooting various issues in Docker and Kubernetes.

Troubleshooting Docker and Kubernetes Containers

Which command can we use to list pods running in our `kube-system` namespace?

Which command can we use to list pods running in our <code>kube-system</code> namespace?

`kubectl logs <pod_name> -c nginx-container2`

`kubectl logs <pod_name> -c -f nginx-container2`

Which command can we use to specifically check a container named `nginx-container2` in our pod?

Which command can we use to specifically check a container named <code>nginx-container2</code> in our pod?

We deployed an application, and the database wasn’t well referenced. Which error will our pod display?

We deployed an application, and the database wasn’t well referenced. Which error will our pod display?

We’re trying to deploy an application, and it has a `dnsPolicy` issue. We viewed the manifest file and the `dnsPolicy` is set to `None`. 

Which `dnsPolicy` can we use to resolve the issue?

We’re trying to deploy an application, and it has a <code>dnsPolicy</code> issue. We viewed the manifest file and the <code>dnsPolicy</code> is set to <code>None</code>.
Which <code>dnsPolicy</code> can we use to resolve the issue?

Which command can we use to get the external IP of our service that’s using `traefik` as its ingress controller?

Which command can we use to get the external IP of our service that’s using <code>traefik</code> as its ingress controller?

Configuring custom resources within the application

Configuring Secrets within the application

Configuring node affinity within the application

What’s important when creating a persistent volume that uses a specific path?

What’s important when creating a persistent volume that uses a specific path?

Test yourself on what you’ve learned so far in this chapter.

Getting Started

Introducing Troubleshooting Containers

Troubleshooting Docker

Fixing Common Issues with Docker

Resolving Docker Container Networking Errors

Troubleshooting Kubernetes

Troubleshooting Further in Kubernetes

Troubleshooting Docker Image Build Issues

Conclusion

Quiz: Troubleshooting Further in Kubernetes