Kubernetes

Kubernetes is a distributed, fault-tolerant, highly-available, customizable, extensible platform for managing container (Containers) workflows.

Map Of Content

• Flavors
  • K3S - a lightweight K8S distribution
  • Tanzu - VMware kubernetes implementation
  • Talos Linux
  • OpenShift
• CSI - Container Storage Interface
  • Longhorn Distributed hyper-converged storage solution by the people behind K3S
• CNIs - Container Networking Interface
  • Calico - Calico is an amazing CNI that has all the features one might need with a bunch of flexibility.
• GitOps
  • FluxCD2 | ArgoCD
• Backup Solutions
  • Velero
• Operator - Software operator for managing Statefull applications
• Tools
  • kubectl - Kubectl is used to administer the Kubernetes cluster(s)
  • Helm - used to package and deploy applications
  • kube-vip
  • Kyverno
• Manifests
  • Kubernetes - Generation Field
  • Kubernetes - Labels, Annotations, Selectors
  • Kubernetes - Owners And Dependents
• Advanced
  • Kubernetes - Concurrency Control And Consistency
  • Kubernetes - Deletion
  • Kubernetes - Multi Cluster Communication
  • ContainerD - Manually Importing Images Into Kubernetes
• Networking
  • Kubernetes - Ingress Nginx
  • Kubernetes - Gateway API
  • Kubernetes - EndpointSlices
  • Kubernetes - Service
  • Kubernetes - Topology Aware Routing
  • Konnectivity
• Security
  • Kubernetes - Allow Anonymous Access To Specific Endpoints
  • Kubernetes - Security Context
  • Kubernetes - Certificates And Certificate Signing Requests
  • Kubernetes - Service Account
• Architecture
  • etcd
  • Kubernetes - kube-controller-manager
  • Kubernetes - cloud-controller manager
  • Kubernetes - kube-scheduler
  • Kubernetes - kube-apiserver
  • Kubernetes - kube-proxy
• Placement
  • Topology Spread Constraints
• SRE
  • Requests And Limits
  • Horizontal Pod Autoscaler
  • Vertical Pod Autoscaler
  • Node Autoscaler
  • Kubernetes - High Availability
  • Kubernetes - Observability
• Kubernetes - Admission Controllers
• Kubernetes - Downard API
• Tips And Tricks
  • Kubernetes - Delete All Empty Replicasets
  • Kubernetes - Get Logs Of All Containers In Namespace

Components Map Of Content

• Compute
  • Node
• Administration
  • Kubernetes - PriorityClass
  • Kubernetes - Pod Disruption Budget
• RBAC
  • RoleBindings
  • ClusterRoleBindings
• ConfigMap
• Secrets
• CRD
• Kubernetes - Finalizer
• Workload
  • Kubernetes - Pod
  • Kubernetes - Deployment
  • Kubernetes - Daemonset
  • Kubernetes - Statefulset
• Kubernetes - Namespace

Troubleshooting

• High CPU
  • Kubernetes - High CPU orphaned pods - Sometimes some pods cannot be cleaned up, so they need a bit of help
• General
  • Kubernetes - Namespace Stuck In Terminating - Happens sometimes if you force delete resources or delete them too fast.
  • Kuberentes - The Server Has Asked For The Client To Provide Credentials
  • Kubernetes - You must be logged in to the server (Unauthorized)
• PVC
  • Kubernetes - volume attachment is being deleted
• Networking
  • Kubernetes - Networking Problems