jonashackt · March 13, 2024 13:36 · Mar 13, 2024 · Dec 20, 2022 · Dec 20, 2022 · Dec 20, 2022
diff --git a/kubernetes-cheatsheet.md b/kubernetes-cheatsheet.md
@@ -1,3 +1,5 @@
+k9s cheatsheet: https://www.hackingnote.com/en/cheatsheets/k9s/
+
 # CLI enhancements
 
 https://discuss.kubernetes.io/t/kubectl-tips-and-tricks/192

diff --git a/kubernetes-cheatsheet.md b/kubernetes-cheatsheet.md
@@ -180,3 +180,5 @@ Bare metal Kubernetes: https://www.siderolabs.com/platform/bare-metal-kubernetes
 K8s simple deployment tooling (simpler than Argo and Flux): https://werf.io/
 
 KubeCon 2022 Recordings: https://www.youtube.com/playlist?list=PLj6h78yzYM2MCEgkd8zH0vJWF7jdQ-GRR
+
+VMWare Tanzu on a Laptop: https://tanzu.vmware.com/developer/guides/tanzu-application-platform-local-devloper-install/ (and in GitHub Actions etc.)
diff --git a/kubernetes-cheatsheet.md b/kubernetes-cheatsheet.md
@@ -177,4 +177,6 @@ Docker Desktop alternatives: https://podman-desktop.io/
 
 Bare metal Kubernetes: https://www.siderolabs.com/platform/bare-metal-kubernetes-sidero/
 
+K8s simple deployment tooling (simpler than Argo and Flux): https://werf.io/
+
 KubeCon 2022 Recordings: https://www.youtube.com/playlist?list=PLj6h78yzYM2MCEgkd8zH0vJWF7jdQ-GRR
diff --git a/kubernetes-cheatsheet.md b/kubernetes-cheatsheet.md
@@ -177,3 +177,4 @@ Docker Desktop alternatives: https://podman-desktop.io/
 
 Bare metal Kubernetes: https://www.siderolabs.com/platform/bare-metal-kubernetes-sidero/
 
+KubeCon 2022 Recordings: https://www.youtube.com/playlist?list=PLj6h78yzYM2MCEgkd8zH0vJWF7jdQ-GRR
diff --git a/kubernetes-cheatsheet.md b/kubernetes-cheatsheet.md
@@ -175,5 +175,5 @@ Telepresence alternative: https://gefyra.dev/
 
 Docker Desktop alternatives: https://podman-desktop.io/
 
-
+Bare metal Kubernetes: https://www.siderolabs.com/platform/bare-metal-kubernetes-sidero/
 
diff --git a/kubernetes-cheatsheet.md b/kubernetes-cheatsheet.md
@@ -161,3 +161,19 @@ kubectl run hostnames --image=k8s.gcr.io/serve_hostname \
 kubectl describe nodes
 
 
+# Awesome tools
+
+Cluster in cluster: https://www.vcluster.com/ & https://github.com/loft-sh/vcluster
+
+https://github.com/ahmetb/kubectl-tree
+
+Deployment abstraction above Helm: https://www.acorn.io/
+
+https://microk8s.io/
+
+Telepresence alternative: https://gefyra.dev/
+
+Docker Desktop alternatives: https://podman-desktop.io/
+
+
+
diff --git a/kubernetes-cheatsheet.md b/kubernetes-cheatsheet.md
@@ -2,6 +2,8 @@
 
 https://discuss.kubernetes.io/t/kubectl-tips-and-tricks/192
 
+krew as the Kubernetes CLI (kubectl) plugin manager helps to install all the tools: https://krew.sigs.k8s.io/
+
 #### kubectl autocompletion
 
 Install kubectl

diff --git a/kubernetes-cheatsheet.md b/kubernetes-cheatsheet.md
@@ -67,6 +67,9 @@ Now this could all look like this:
 
 [![asciicast](https://asciinema.org/a/441785.svg)](https://asciinema.org/a/441785)
 
+
+For evaluation tools ee https://learnk8s.io/validating-kubernetes-yaml
+
 #### kubeval
 
 Install via homebrew (see https://www.kubeval.com/installation/):
@@ -79,6 +82,16 @@ brew install kubeval
 Now use `kubeval your-yaml-to-check.yaml`
 
 
+#### kubescore
+
+Install via homebrew (see https://github.com/zegl/kube-score#installation): `brew install kube-score`
+
+Run with
+```
+kube-score score your-yaml-to-check.yaml
+```
+
+
 # K8s cluster
 
 ### See logs of K8s cluster

diff --git a/kubernetes-cheatsheet.md b/kubernetes-cheatsheet.md
@@ -67,6 +67,18 @@ Now this could all look like this:
 
 [![asciicast](https://asciinema.org/a/441785.svg)](https://asciinema.org/a/441785)
 
+#### kubeval
+
+Install via homebrew (see https://www.kubeval.com/installation/):
+
+```
+brew tap instrumenta/instrumenta
+brew install kubeval
+```
+
+Now use `kubeval your-yaml-to-check.yaml`
+
+
 # K8s cluster
 
 ### See logs of K8s cluster

diff --git a/kubernetes-cheatsheet.md b/kubernetes-cheatsheet.md
@@ -63,6 +63,10 @@ kubeon
 kubeoff
 ```
 
+Now this could all look like this:
+
+[![asciicast](https://asciinema.org/a/441785.svg)](https://asciinema.org/a/441785)
+
 # K8s cluster
 
 ### See logs of K8s cluster

diff --git a/kubernetes-cheatsheet.md b/kubernetes-cheatsheet.md
@@ -1,5 +1,7 @@
 # CLI enhancements
 
+https://discuss.kubernetes.io/t/kubectl-tips-and-tricks/192
+
 #### kubectl autocompletion
 
 Install kubectl

diff --git a/kubernetes-cheatsheet.md b/kubernetes-cheatsheet.md
@@ -1,6 +1,6 @@
 # CLI enhancements
 
-# kubectl autocompletion
+#### kubectl autocompletion
 
 Install kubectl
 
@@ -39,7 +39,7 @@ $(brew --prefix)/opt/fzf/install
 
 Now your `kubectx` and `kubens` are super powered as interactive mode :)
 
-### kube-ps1
+#### kube-ps1
 
 https://github.com/jonmosco/kube-ps1: 
 

diff --git a/kubernetes-cheatsheet.md b/kubernetes-cheatsheet.md
@@ -1,5 +1,18 @@
 # CLI enhancements
 
+# kubectl autocompletion
+
+Install kubectl
+
+then configure autocompletion as stated in the docs: https://kubernetes.io/docs/tasks/tools/install-kubectl-macos/#optional-kubectl-configurations-and-plugins with adding the following to your ~/.zshrc or ~/.bashrc:
+
+```
+### kubectl autocompletion & alias k
+source <(kubectl completion zsh)
+alias k=kubectl
+complete -F __start_kubectl k
+```
+
 #### kubectx & kubens
 
 https://github.com/ahmetb/kubectx: Install via brew: `brew install kubectx`

diff --git a/kubernetes-cheatsheet.md b/kubernetes-cheatsheet.md
@@ -13,6 +13,19 @@ kubectx
 kubectx k3d
 ```
 
+#### kubectx interactive mode
+
+If you want a fancy interactive mode, you need to install https://github.com/junegunn/fzf#using-homebrew
+
+```
+brew install fzf
+
+# To install useful key bindings and fuzzy completion:
+$(brew --prefix)/opt/fzf/install
+```
+
+Now your `kubectx` and `kubens` are super powered as interactive mode :)
+
 ### kube-ps1
 
 https://github.com/jonmosco/kube-ps1: 

diff --git a/kubernetes-cheatsheet.md b/kubernetes-cheatsheet.md
@@ -1,5 +1,7 @@
 # CLI enhancements
 
+#### kubectx & kubens
+
 https://github.com/ahmetb/kubectx: Install via brew: `brew install kubectx`
 
 Now run it and switch with ease:
@@ -11,6 +13,28 @@ kubectx
 kubectx k3d
 ```
 
+### kube-ps1
+
+https://github.com/jonmosco/kube-ps1: 
+
+install via: 
+
+```
+brew install kube-ps1
+
+# now source kube-ps1.sh in your ~/.zshrc or ~/.bashrc. Therefore add the following 2 lines to them:
+source "/usr/local/opt/kube-ps1/share/kube-ps1.sh"
+PS1='$(kube_ps1)'$PS1
+```
+
+Now you should already see the current k8s context & namespace inside your prompt:
+
+```
+# switch on and off
+kubeon
+kubeoff
+```
+
 # K8s cluster
 
 ### See logs of K8s cluster

diff --git a/kubernetes-cheatsheet.md b/kubernetes-cheatsheet.md
@@ -1,9 +1,14 @@
 # CLI enhancements
 
-https://github.com/ahmetb/kubectx: Install via brew:
+https://github.com/ahmetb/kubectx: Install via brew: `brew install kubectx`
+
+Now run it and switch with ease:
 
 ```
-brew install kubectx
+# list all contexts
+kubectx
+# switch
+kubectx k3d
 ```
 
 # K8s cluster

diff --git a/kubernetes-cheatsheet.md b/kubernetes-cheatsheet.md
@@ -1,3 +1,11 @@
+# CLI enhancements
+
+https://github.com/ahmetb/kubectx: Install via brew:
+
+```
+brew install kubectx
+```
+
 # K8s cluster
 
 ### See logs of K8s cluster

diff --git a/kubernetes-cheatsheet.md b/kubernetes-cheatsheet.md
@@ -56,6 +56,7 @@ kubectl run hostnames --image=k8s.gcr.io/serve_hostname \
                         --replicas=3
 ```
 
+`kubectl expose deployment hostnames --port=80 --target-port=9376`
 
 
 # Worker

diff --git a/kubernetes-cheatsheet.sh → kubernetes-cheatsheet.md b/kubernetes-cheatsheet.sh → kubernetes-cheatsheet.md
@@ -1,51 +1,66 @@
-# See logs of K8s cluster
+# K8s cluster
+
+### See logs of K8s cluster
 https://kubernetes.io/docs/tasks/debug-application-cluster/debug-cluster/#looking-at-logs
 
-# show k8s api-server logging
+### show k8s api-server logging
 sudo journalctl -u kube-apiserver --follow
 
-#see https://kubernetes.io/docs/reference/kubectl/cheatsheet/
+see https://kubernetes.io/docs/reference/kubectl/cheatsheet/
 
-# Retrieve cluster info
+### Retrieve cluster info
 kubectl cluster-info dump
 
-# every component with namespace kube-system 
+### every component with namespace kube-system 
 kubectl get all --namespace kube-system
 
-# every component
+### every component
 kubectl get all --all-namespaces
 
+
 # etcd
 
-## get all etcd entries
+### get all etcd entries
 ETCDCTL_API=3 etcdctl --endpoints=https://127.0.0.1:2379 --cacert=/etc/etcd/ca.pem --cert=/etc/etcd/kube-apiserver.pem --key=/etc/etcd/kube-apiserver-key.pem get / --prefix --keys-only
 
+
 # Networking
 kubectl get nodes --output json
 
-# Flannel logging
+### Flannel logging
 kubectl logs -n kube-system kube-flannel-ds-cw7kf -c kube-flannel
 
 kubectl get pod kube-flannel-ds-cw7kf --namespace kube-system -o yaml
 
-# Kube-DNS
+### Kube-DNS
 kubectl describe pods -l k8s-app=kube-dns -n kube-system
 
 kubectl get nodes --output=jsonpath='{range .items[*]}{.status.addresses[?(@.type=="InternalIP")].address} {.spec.podCIDR} {"\n"}{end}'
 
-## Debug kube-dns
-## see https://kubernetes.io/docs/tasks/administer-cluster/dns-debugging-resolution/
+### Debug kube-dns
+ see https://kubernetes.io/docs/tasks/administer-cluster/dns-debugging-resolution/
 
 kubectl logs --namespace=kube-system $(kubectl get pods --namespace=kube-system -l k8s-app=kube-dns -o name | head -1) -c kubedns
 kubectl logs --namespace=kube-system $(kubectl get pods --namespace=kube-system -l k8s-app=kube-dns -o name | head -1) -c dnsmasq
 kubectl logs --namespace=kube-system $(kubectl get pods --namespace=kube-system -l k8s-app=kube-dns -o name | head -1) -c sidecar
 
-# CoreDNS
+### CoreDNS
 kubectl describe pod/coredns-65db874f4f-lz5hl --namespace kube-system
 
+### DNS
+see https://kubernetes.io/docs/tasks/debug-application-cluster/debug-service/#does-the-service-work-by-ip
+```
+kubectl run hostnames --image=k8s.gcr.io/serve_hostname \
+                        --labels=app=hostnames \
+                        --port=9376 \
+                        --replicas=3
+```
+
 
 
 # Worker
 
 ### K8s nodes in State NotReady
-kubectl describe nodes
+kubectl describe nodes
+
+
diff --git a/kubernetes-cheatsheet.sh b/kubernetes-cheatsheet.sh
@@ -37,6 +37,8 @@ kubectl get nodes --output=jsonpath='{range .items[*]}{.status.addresses[?(@.typ
 ## see https://kubernetes.io/docs/tasks/administer-cluster/dns-debugging-resolution/
 
 kubectl logs --namespace=kube-system $(kubectl get pods --namespace=kube-system -l k8s-app=kube-dns -o name | head -1) -c kubedns
+kubectl logs --namespace=kube-system $(kubectl get pods --namespace=kube-system -l k8s-app=kube-dns -o name | head -1) -c dnsmasq
+kubectl logs --namespace=kube-system $(kubectl get pods --namespace=kube-system -l k8s-app=kube-dns -o name | head -1) -c sidecar
 
 # CoreDNS
 kubectl describe pod/coredns-65db874f4f-lz5hl --namespace kube-system

diff --git a/kubernetes-cheatsheet.sh b/kubernetes-cheatsheet.sh
@@ -33,5 +33,17 @@ kubectl describe pods -l k8s-app=kube-dns -n kube-system
 
 kubectl get nodes --output=jsonpath='{range .items[*]}{.status.addresses[?(@.type=="InternalIP")].address} {.spec.podCIDR} {"\n"}{end}'
 
+## Debug kube-dns
+## see https://kubernetes.io/docs/tasks/administer-cluster/dns-debugging-resolution/
+
+kubectl logs --namespace=kube-system $(kubectl get pods --namespace=kube-system -l k8s-app=kube-dns -o name | head -1) -c kubedns
+
 # CoreDNS
-kubectl describe pod/coredns-65db874f4f-lz5hl --namespace kube-system
+kubectl describe pod/coredns-65db874f4f-lz5hl --namespace kube-system
+
+
+
+# Worker
+
+### K8s nodes in State NotReady
+kubectl describe nodes
diff --git a/bash.sh → kubernetes-cheatsheet.sh b/bash.sh → kubernetes-cheatsheet.sh
diff --git a/bash.sh b/bash.sh
@@ -1,6 +1,9 @@
 # See logs of K8s cluster
 https://kubernetes.io/docs/tasks/debug-application-cluster/debug-cluster/#looking-at-logs
 
+# show k8s api-server logging
+sudo journalctl -u kube-apiserver --follow
+
 #see https://kubernetes.io/docs/reference/kubectl/cheatsheet/
 
 # Retrieve cluster info

diff --git a/bash.sh b/bash.sh
@@ -1,3 +1,6 @@
+# See logs of K8s cluster
+https://kubernetes.io/docs/tasks/debug-application-cluster/debug-cluster/#looking-at-logs
+
 #see https://kubernetes.io/docs/reference/kubectl/cheatsheet/
 
 # Retrieve cluster info

diff --git a/bash.sh b/bash.sh
@@ -9,6 +9,11 @@ kubectl get all --namespace kube-system
 # every component
 kubectl get all --all-namespaces
 
+# etcd
+
+## get all etcd entries
+ETCDCTL_API=3 etcdctl --endpoints=https://127.0.0.1:2379 --cacert=/etc/etcd/ca.pem --cert=/etc/etcd/kube-apiserver.pem --key=/etc/etcd/kube-apiserver-key.pem get / --prefix --keys-only
+
 # Networking
 kubectl get nodes --output json
 

diff --git a/bash.sh b/bash.sh
@@ -6,6 +6,9 @@ kubectl cluster-info dump
 # every component with namespace kube-system 
 kubectl get all --namespace kube-system
 
+# every component
+kubectl get all --all-namespaces
+
 # Networking
 kubectl get nodes --output json
 

diff --git a/bash.sh b/bash.sh
@@ -17,4 +17,7 @@ kubectl get pod kube-flannel-ds-cw7kf --namespace kube-system -o yaml
 # Kube-DNS
 kubectl describe pods -l k8s-app=kube-dns -n kube-system
 
-kubectl get nodes --output=jsonpath='{range .items[*]}{.status.addresses[?(@.type=="InternalIP")].address} {.spec.podCIDR} {"\n"}{end}'
+kubectl get nodes --output=jsonpath='{range .items[*]}{.status.addresses[?(@.type=="InternalIP")].address} {.spec.podCIDR} {"\n"}{end}'
+
+# CoreDNS
+kubectl describe pod/coredns-65db874f4f-lz5hl --namespace kube-system
diff --git a/bash.sh b/bash.sh
@@ -6,6 +6,9 @@ kubectl cluster-info dump
 # every component with namespace kube-system 
 kubectl get all --namespace kube-system
 
+# Networking
+kubectl get nodes --output json
+
 # Flannel logging
 kubectl logs -n kube-system kube-flannel-ds-cw7kf -c kube-flannel
 

diff --git a/bash.sh b/bash.sh
@@ -12,4 +12,6 @@ kubectl logs -n kube-system kube-flannel-ds-cw7kf -c kube-flannel
 kubectl get pod kube-flannel-ds-cw7kf --namespace kube-system -o yaml
 
 # Kube-DNS
-kubectl describe pods -l k8s-app=kube-dns -n kube-system
+kubectl describe pods -l k8s-app=kube-dns -n kube-system
+
+kubectl get nodes --output=jsonpath='{range .items[*]}{.status.addresses[?(@.type=="InternalIP")].address} {.spec.podCIDR} {"\n"}{end}'
diff --git a/bash.sh b/bash.sh
@@ -7,4 +7,9 @@ kubectl cluster-info dump
 kubectl get all --namespace kube-system
 
 # Flannel logging
-kubectl get pod kube-flannel-ds-cw7kf --namespace kube-system -o yaml
+kubectl logs -n kube-system kube-flannel-ds-cw7kf -c kube-flannel
+
+kubectl get pod kube-flannel-ds-cw7kf --namespace kube-system -o yaml
+
+# Kube-DNS
+kubectl describe pods -l k8s-app=kube-dns -n kube-system
Original file line number	Diff line number	Diff line change
		@@ -177,3 +177,4 @@ Docker Desktop alternatives: https://podman-desktop.io/

		Bare metal Kubernetes: https://www.siderolabs.com/platform/bare-metal-kubernetes-sidero/

		KubeCon 2022 Recordings: https://www.youtube.com/playlist?list=PLj6h78yzYM2MCEgkd8zH0vJWF7jdQ-GRR
Original file line number	Diff line number	Diff line change
		@@ -175,5 +175,5 @@ Telepresence alternative: https://gefyra.dev/

		Docker Desktop alternatives: https://podman-desktop.io/


		Bare metal Kubernetes: https://www.siderolabs.com/platform/bare-metal-kubernetes-sidero/