modified: README.md
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Kubernetes is an open‑source platform that automates the deployment, scaling, and management of containerized applications. It acts as an orchestrator, ensuring your containers run reliably across clusters of machines, handling networking, storage, and updates without downtime.
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- [Namespaces](#namespaces)
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- [kubernetes](#kubernetes)
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- [Namespaces](#namespaces)
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- [Create namespace](#create-namespace)
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- [namespace stuck on delete](#namespace-stuck-on-delete)
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- [Pods](#pods)
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- [Pods](#pods)
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- [Create an pod](#create-an-pod)
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- [Get Pod](#get-pod)
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- [delete Pod](#delete-pod)
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@@ -14,8 +15,8 @@ Kubernetes is an open‑source platform that automates the deployment, scaling,
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- [OOMKilled](#oomkilled)
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- [Attach to an pod](#attach-to-an-pod)
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- [Run command on pod](#run-command-on-pod)
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- [Container TTY](#container-tty)
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- [Persistent volumes](#persistent-volumes)
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- [Keep pod Alive](#keep-pod-alive)
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- [Persistent volumes](#persistent-volumes)
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- [create PersistentVolumes - host path](#create-persistentvolumes---host-path)
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- [find persistent volume used pvc](#find-persistent-volume-used-pvc)
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- [Patch pv - change to retain policy](#patch-pv---change-to-retain-policy)
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@@ -23,42 +24,44 @@ Kubernetes is an open‑source platform that automates the deployment, scaling,
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- [check orphans](#check-orphans)
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- [persistent volume claims](#persistent-volume-claims)
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- [Create an pod with PVC](#create-an-pod-with-pvc)
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- [kubectl](#kubectl)
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- [kubectl](#kubectl)
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- [Helper pods](#helper-pods)
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- [network testing](#network-testing)
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- [Resources](#resources)
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- [Services Accounts](#services-accounts)
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- [Secrets](#secrets)
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- [configMap](#configmap)
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- [Secrets](#secrets)
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- [Manifest - Opaque / Base64](#manifest---opaque--base64)
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- [Manifest - StringData](#manifest---stringdata)
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- [Inline with heredoc and environment variables](#inline-with-heredoc-and-environment-variables)
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- [substr](#substr)
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- [annotations](#annotations)
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- [nodes](#nodes)
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- [taints](#taints)
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- [mounting](#mounting)
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- [annotations](#annotations)
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- [nodes](#nodes)
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- [taints](#taints)
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- [add taint](#add-taint)
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- [remove taint](#remove-taint)
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- [control plane - NoSchedule](#control-plane---noschedule)
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- [Official \*.kubernetes.io taints](#official-kubernetesio-taints)
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- [cordon](#cordon)
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- [statefulset](#statefulset)
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- [statefulset](#statefulset)
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- [statefulset - Set Replicas](#statefulset---set-replicas)
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- [Deployment](#deployment)
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- [Deployment](#deployment)
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- [Deployment - Set Replicas](#deployment---set-replicas)
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- [Deployment - rollout restart](#deployment---rollout-restart)
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- [Daemonset](#daemonset)
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- [Daemonset](#daemonset)
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- [Daemonset - rollout restart](#daemonset---rollout-restart)
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- [services](#services)
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- [certs](#certs)
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- [services](#services)
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- [certs](#certs)
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- [list all certs](#list-all-certs)
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- [get cert end date](#get-cert-end-date)
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- [service accounts](#service-accounts)
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- [Services DNS Name](#services-dns-name)
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- [core-dns](#core-dns)
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- [service accounts](#service-accounts)
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- [Services DNS Name](#services-dns-name)
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- [core-dns](#core-dns)
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- [Overrides](#overrides)
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- [Remove warning from logs](#remove-warning-from-logs)
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- [Custom Resource Definitions](#custom-resource-definitions)
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- [k3s](#k3s)
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- [Custom Resource Definitions](#custom-resource-definitions)
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- [k3s](#k3s)
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- [Install / Setup](#install--setup)
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- [prune old images](#prune-old-images)
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- [kill all](#kill-all)
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@@ -69,12 +72,12 @@ Kubernetes is an open‑source platform that automates the deployment, scaling,
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- [klipper-lb](#klipper-lb)
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- [troubleshooting](#troubleshooting)
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- [Containerd state](#containerd-state)
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- [host cli](#host-cli)
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- [host cli](#host-cli)
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- [host cli - check port usage](#host-cli---check-port-usage)
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- [kill all connections](#kill-all-connections)
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- [cert-manager](#cert-manager)
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- [cert-manager](#cert-manager)
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- [Removing cert‑manager Metadata from Secrets](#removing-certmanager-metadata-from-secrets)
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- [hosting](#hosting)
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- [hosting](#hosting)
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- [misc](#misc)
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## Namespaces
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@@ -336,7 +339,11 @@ POD_NAME=$(kubectl get pod -l app=$MY_APP_NAME -n $NAMESPACE -o jsonpath='{.item
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kubectl exec -n $NAMESPACE -it ${POD_NAME} -- sh
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```
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### Container TTY
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### Keep pod Alive
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```yaml
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command: ["tail", "-f", "/dev/null"]
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```
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```yaml
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...
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@@ -582,6 +589,20 @@ kubectl get secret <secret_name> -o jsonpath='{.data.token}' | base64 -d > ./ser
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kubectl config view --raw -o jsonpath='{.clusters[0].cluster.certificate-authority-data}'
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```
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## configMap
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```yaml
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apiVersion: v1
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kind: ConfigMap
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metadata:
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name: my-config
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data:
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app.conf: |
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key=value
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nested/file.txt: |
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hello
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```
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## Secrets
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### Manifest - Opaque / Base64
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@@ -659,6 +680,24 @@ envsubst < ./secret.yaml | kubectl apply -f -
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```
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### mounting
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``` yaml
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volumeMounts:
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- name: secret-name
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mountPath: /secret
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subPath: mySecret
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volumes:
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- name: secret-name
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secret:
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secretName: secret-name
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# required if secret is ah ssh identity
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# defaultMode: 0400
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```
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## annotations
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``` bash
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