A POD typically goes through five phases: Pending, Running, Succeeded, Failed, and Unknown. The first step when checking for POD failure is to inspect its state. Troubleshooting PODsĪ POD may not be available to users for a number of reasons. This section explores how to debug and troubleshoot these components. When a Kubernetes application is not running, it could be because of failure in one of three things: PODs, Services and Replication Controllers. Sometimes the application deployed into Kubernetes may not behave as expected. The section is packed with practical labs exploring failure and resolution scenarios for applicable knowledge on debugging and troubleshooting running Kubernetes clusters. This section introduces these failures and the techniques that can be used to identify and resolve errors at each level of the Kubernetes environment. Errors can go wrong at different levels, and this gives rise to various types of failure. Anything can go wrong, and administrators need a way to track and work on errors when running Kubernetes applications at production. The Kubernetes environment typically spans multiple machines, running different services and components.
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