Learn Kubernetes Basics

Tasks

Tasks
Install Tools
Install and Set Up kubectl
Install Minikube
Administer a Cluster
Administration with kubeadm
Certificate Management with kubeadm
Upgrading kubeadm clusters
Adding Windows nodes
Upgrading Windows nodes
Manage Memory, CPU, and API Resources
Configure Default Memory Requests and Limits for a Namespace
Configure Default CPU Requests and Limits for a Namespace
Configure Minimum and Maximum Memory Constraints for a Namespace
Configure Minimum and Maximum CPU Constraints for a Namespace
Configure Memory and CPU Quotas for a Namespace
Configure a Pod Quota for a Namespace
Install a Network Policy Provider
Use Calico for NetworkPolicy
Use Cilium for NetworkPolicy
Use Kube-router for NetworkPolicy
Romana for NetworkPolicy
Weave Net for NetworkPolicy
Access Clusters Using the Kubernetes API
Access Services Running on Clusters
Advertise Extended Resources for a Node
Autoscale the DNS Service in a Cluster
Change the default StorageClass
Change the Reclaim Policy of a PersistentVolume
Cluster Management
Configure Multiple Schedulers
Configure Out of Resource Handling
Configure Quotas for API Objects
Control CPU Management Policies on the Node
Control Topology Management Policies on a node
Customizing DNS Service
Debugging DNS Resolution
Declare Network Policy
Developing Cloud Controller Manager
Enabling EndpointSlices
Enabling Service Topology
Encrypting Secret Data at Rest
Guaranteed Scheduling For Critical Add-On Pods
IP Masquerade Agent User Guide
Kubernetes Cloud Controller Manager
Limit Storage Consumption
Namespaces Walkthrough
Operating etcd clusters for Kubernetes
Reconfigure a Node's Kubelet in a Live Cluster
Reserve Compute Resources for System Daemons
Safely Drain a Node while Respecting the PodDisruptionBudget
Securing a Cluster
Set Kubelet parameters via a config file
Set up High-Availability Kubernetes Masters
Share a Cluster with Namespaces
Using a KMS provider for data encryption
Using CoreDNS for Service Discovery
Using NodeLocal DNSCache in Kubernetes clusters
Using sysctls in a Kubernetes Cluster
Configure Pods and Containers
Assign Memory Resources to Containers and Pods
Assign CPU Resources to Containers and Pods
Configure GMSA for Windows Pods and containers
Configure RunAsUserName for Windows pods and containers
Configure Quality of Service for Pods
Assign Extended Resources to a Container
Configure a Pod to Use a Volume for Storage
Configure a Pod to Use a PersistentVolume for Storage
Configure a Pod to Use a Projected Volume for Storage
Configure a Security Context for a Pod or Container
Configure Service Accounts for Pods
Pull an Image from a Private Registry
Configure Liveness, Readiness and Startup Probes
Assign Pods to Nodes
Assign Pods to Nodes using Node Affinity
Configure Pod Initialization
Attach Handlers to Container Lifecycle Events
Configure a Pod to Use a ConfigMap
Share Process Namespace between Containers in a Pod
Create static Pods
Translate a Docker Compose File to Kubernetes Resources
Manage Kubernetes Objects
Declarative Management of Kubernetes Objects Using Configuration Files
Declarative Management of Kubernetes Objects Using Kustomize
Managing Kubernetes Objects Using Imperative Commands
Imperative Management of Kubernetes Objects Using Configuration Files
Inject Data Into Applications
Define a Command and Arguments for a Container
Define Environment Variables for a Container
Expose Pod Information to Containers Through Environment Variables
Expose Pod Information to Containers Through Files
Distribute Credentials Securely Using Secrets
Inject Information into Pods Using a PodPreset
Run Applications
Run a Stateless Application Using a Deployment
Run a Single-Instance Stateful Application
Run a Replicated Stateful Application
Update API Objects in Place Using kubectl patch
Scale a StatefulSet
Delete a StatefulSet
Force Delete StatefulSet Pods
Perform Rolling Update Using a Replication Controller
Horizontal Pod Autoscaler
Horizontal Pod Autoscaler Walkthrough
Specifying a Disruption Budget for your Application
Run Jobs
Running Automated Tasks with a CronJob
Parallel Processing using Expansions
Coarse Parallel Processing Using a Work Queue
Fine Parallel Processing Using a Work Queue
Access Applications in a Cluster
Web UI (Dashboard)
Accessing Clusters
Configure Access to Multiple Clusters
Use Port Forwarding to Access Applications in a Cluster
Use a Service to Access an Application in a Cluster
Connect a Front End to a Back End Using a Service
Create an External Load Balancer
Configure Your Cloud Provider's Firewalls
List All Container Images Running in a Cluster
Set up Ingress on Minikube with the NGINX Ingress Controller
Communicate Between Containers in the Same Pod Using a Shared Volume
Configure DNS for a Cluster
Monitoring, Logging, and Debugging
Application Introspection and Debugging
Auditing
Auditing with Falco
Debug a StatefulSet
Debug Init Containers
Debug Pods and ReplicationControllers
Debug Running Pods
Debug Services
Debugging Kubernetes nodes with crictl
Determine the Reason for Pod Failure
Developing and debugging services locally
Events in Stackdriver
Get a Shell to a Running Container
Logging Using Elasticsearch and Kibana
Logging Using Stackdriver
Monitor Node Health
Resource metrics pipeline
Tools for Monitoring Resources
Troubleshoot Applications
Troubleshoot Clusters
Troubleshooting
Extend Kubernetes
Configure the Aggregation Layer
Use Custom Resources
Extend the Kubernetes API with CustomResourceDefinitions
Versions in CustomResourceDefinitions
Setup an Extension API Server
Use an HTTP Proxy to Access the Kubernetes API
TLS
Certificate Rotation
Manage TLS Certificates in a Cluster
Manage Cluster Daemons
Perform a Rolling Update on a DaemonSet
Perform a Rollback on a DaemonSet
Install Service Catalog
Install Service Catalog using Helm
Install Service Catalog using SC
Network
Validate IPv4/IPv6 dual-stack
Extend kubectl with plugins
Manage HugePages
Schedule GPUs

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Debug a StatefulSet

This task shows you how to debug a StatefulSet.

Before you begin

  • You need to have a Kubernetes cluster, and the kubectl command-line tool must be configured to communicate with your cluster.
  • You should have a StatefulSet running that you want to investigate.

Debugging a StatefulSet

In order to list all the pods which belong to a StatefulSet, which have a label app=myapp set on them, you can use the following:

kubectl get pods -l app=myapp

If you find that any Pods listed are in Unknown or Terminating state for an extended period of time, refer to the Deleting StatefulSet Pods task for instructions on how to deal with them. You can debug individual Pods in a StatefulSet using the Debugging Pods guide.

What's next

Learn more about debugging an init-container.

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