For example, you can look at kubectl describe and see that you have an image pull error and you just forgot to put in some information (like a secret for an image pull).

If you see some false information (like no endpoints), try to re-create the service and double check your kubectl expose command for possible mistakes. There are multiple ways to achieve this: Source the completion script in your ~/.bash_profile file: Add the completion script to the /usr/local/etc/bash_completion.d directory: If you installed kubectl with Homebrew (as explained above), then the kubectl completion script should already be in /usr/local/etc/bash_completion.d/kubectl. Sometimes it can go smoothly and you’ll see the message deployment created! Or if you have curl installed, use this command: To find out the latest stable version (for example, for scripting), take a look at https://storage.googleapis.com/kubernetes-release/release/stable.txt. Download the latest release v1.18.8 from this link. Kubernetes v1.18 documentation is no longer actively maintained. In the test environment, however, you’d probably be happy to access shell to run tests while the container is running. You can read more. kubectl get events -n monitoring. Use a node-level logging agent that runs on every node. Isn’t the low weight the biggest advantage of using containers?” You can see in the above example that we have the podSelector inside the spec, which selects the pods we want to include in this NetworkPolicy. Let’s try to get more information about this service: Check if you used the right NodePort to access the container and that you have endpoints. Further reading: For some guidance on Kubernetes networking, check out Kubernetes Networking: A lab on basic networking concepts. You should double-check those parameters and make sure you insert the right labels, ip, and ports so that you can allow your pods to communicate and not be blocked. Another important parameter that you should check are the ingress and egress; they affect what income and outcome networks are allowed to communicate with the pods in the podSelector. To get basic information about your pods you can use this simple command: But you can get much more information if you describe a specific pod, like this: From the above, you can see the configuration information about the container(s) and the pod (labels, resource requirements, etc. or

kubeconfig file, Most of the time your container logs are your pod logs, especially if your pod only has one container in it. NetworkPolicy uses the labels to manage the traffic between pods. Sometimes using these basic command should be enough. Learn how to launch and expose your application. You can also get your information in json format: You should always double-check some configurations that might cause the problem, like questioning if the spec.ports is the right targetPort for your pod.

There are two ways in which you can do this: Source the completion script in your ~/.bashrc file: Add the completion script to the /etc/bash_completion.d directory: If you have an alias for kubectl, you can extend shell completion to work with that alias: Both approaches are equivalent. The cluster suffix is passed into kubelet with the –cluster-domain flag. Sourcing this script in your shell enables kubectl completion. Errors like nslookup: can't resolve 'kubernetes.default' might indicate that the problem is in the coredns/kube-dns add-on or associated services. To do so in all your shell sessions, add the following to your ~/.zshrc file: After reloading your shell, kubectl autocompletion should be working.

Let’s look at how they differ: For more information about these approaches, you can read this guide. Overview of kubectl. Read Also: Kubernetes get pods on a Specific Node. It provides a top-down view into your app as well as your entire infrastructure, and allows you to diagnose any problems with your distributed containerized app in real time, as it being deployed to a cloud provider. Sometimes we forget to create a service for our pod, as it is essential to have a service. The kubectl completion script for Bash can be generated with the command kubectl completion bash. Below are the procedures to set up autocompletion for Bash (including the difference between Linux and macOS) and Zsh. Download the latest release with the command: To download a specific version, replace the $(curl -s https://storage.googleapis.com/kubernetes-release/release/stable.txt) portion of the command with the specific version. However, the kubectl completion script depends on bash-completion which you thus have to previously install. report a problem The above commands create /usr/share/bash-completion/bash_completion, which is the main script of bash-completion. If you see a message similar to the following, kubectl is not configured correctly or is not able to connect to a Kubernetes cluster. suggest an improvement. What many developers don’t know is that the event (kubectl get events) is actually a resource type in Kubernetes. Kubernetes is an open source system for managing containerized applications across multiple hosts, providing basic mechanisms for deployment, maintenance, and scaling of applications. You can get logs for a specific pod and if the pod has multiple containers, you can specify which container you want. Kubernetes sets this to 5 by default, which is high enough to cover all of the DNS names that it generates. Run the installation commands (making sure to specify a DownloadLocation): The installer creates $HOME/.kube and instructs it to create a config file.

), and the status information about the container(s) and pod (state, readiness, restart count, events, etc). This tutorial is for developers who want to understand more about the Kubernetes cluster and how to debug and get logs from your application. The above command will show all the events from all the namespaces with the timestamp. If your pod and service are in different namespaces, try a namespace-qualified name (default) – but you will need to adjust your app to use a cross-namespace name, or run your app and service in the same namespace.

Let’s look at gathering information here, as there are many ways to tools and techniques to gather information. The NetworkPolicy defines how pods are allowed to communicate with each other and with other network endpoints. In the production environment, you will probably want to maximize performance and there’s no reason to put the shell into the image. If all of the above still fail, you might need to check your kube-proxy. Will cause a service outage.

Now that you have learned the basics of logging and debugging your Kubernetes application, you can try to use and explore some more tools: Learn how to deploy an application to a Kubernetes cluster on IBM Cloud in this tutorial: “, Kubernetes 101: Labs designed to help you achieve an understanding of Kubernetes, IBM's dedication to open source and its involvement with the CNCF, Deploy a scalable WordPress implementation on Kubernetes, Security-first certification for cloud-native workloads, Build and deploy apps on Kubernetes using a Tekton pipeline, Build a Tekton pipeline to deploy a mobile app back end to Red Hat OpenShift 4, Kubernetes Networking: A lab on basic networking concepts, Tools for Monitoring Compute, Storage, and Network Resources, IBM Cloud Kubernetes Service: Manage apps in containers and clusters on cloud, To deploy a sample application and connect kubectl to the Kubernetes cluster. In order to get Kubernetes events from the specific namespace, run: kubectl get events --namespace --sort-by='{.lastTimestamp}' Debugging Pods and Containers Container Logs

To help you get better results from logs, you can use “kubetail”, which is an open source project that paints every type of log in a different color. This could mean your host’s database server is down. You must use a kubectl version that is within one minor version difference of your cluster. To see the logs, you can run this simple command: Note: To print to the logs, write to stdout/stderr from your application. You now have to ensure that the kubectl completion script gets sourced in all your shell sessions. If you still need help you can always visit the WordPress Support Forums.

Let’s take a look at the important events parameters, where you can see that the event record contains the following: There are more parameters that we don’t see in the list above that might be useful for you like METADATA, which is a standard object meta data. If not Weave Scope, I highly encourage you to use a similar monitoring tool to easily display what your containers are doing and why. The kubectl completion script for Bash can be generated with kubectl completion bash. The Kubernetes command-line tool, kubectl, allows

As you can see in the example above, the Kubernetes event indicates an issue with the Pod’s volume attach/mount due to the timeout. The Shell exec will probably take some space and make your container heavy, so you might ask “Why should I put it inside my container? Remember that you can only do this, though, if you have the Shell exec in the container. Grafana is an open-source, general purpose dashboard and graph composer, which runs as a web application. kubectl replace --force -f ./pod.json # Create a service for a replicated nginx, which serves on port 80 and connects to the containers on port 8000 kubectl expose rc nginx --port = 80--target-port = 8000 # Update a single-container pod's image version (tag) to v4 kubectl get pod mypod -o yaml | sed 's/\(image: myimage\):. Open an issue in the GitHub repo if you want to Are you sure you have typed the correct hostname?

The open source project is hosted by the Cloud Native Computing Foundation, and in this tutorial is hosted on the IBM Cloud Kubernetes Service. If you are not able to communicate with pods, you might want check your network policies to see if this pod doesnt allowed to get any requests. This either means that the username and password information in your wp-config.php file is incorrect or we can’t contact the database server at localhost. There are a few more ways to inspect your service. Are you sure the database server is running. For a complete list of kubectl operations, see An issue that comes up frequently for new installations of Kubernetes is that the service aren’t working properly, so you run your deployment and create a service but still don’t get any response. However, the completion script depends on bash-completion, which means that you have to install this software first (you can test if you have bash-completion already installed by running type _init_completion). The options line must set ndots high enough that your DNS client library considers search paths at all. You can use Grafana to get CPU/memory/load metrics of your clusters and pods. After reloading your shell, kubectl autocompletion should be working. Or maybe you used the latest image version that wasn’t working well and you want to switch back to the previous version.

latest version. But once you have NetworkPolicy selected a specific pod, you’ll reject any communication with unauthorized connections. What many developers don’t know is that the event (kubectl get events) is actually a resource type in Kubernetes. EVENTTIME is when the event was first observed.

To install Weave Cope on your Kubernetes cluster, find directions here. Run kubectl get rs to see that the Deployment updated the Pods by creating a new ReplicaSet and scaling it up to 3 replicas, as well as scaling down the old ReplicaSet to 0 replicas. To find out, reload your shell and run type _init_completion. For example, if you are intending to run a Kubernetes cluster on your laptop (locally), you will need a tool like Minikube to be installed first and then re-run the commands stated above.

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