obsidian-vault/temporary.md

id	aliases	tags	created	language	summary
temporary		default	2025-07-20	English	Temporary notes that are not integrated yet

PDF Gear, add to overall IT vault

Da ich offensichtlich nicht gut plane, brauche ich AI die das für mich tut

Musik db

MCP server schreiben?

Rucksack manuell waschen?

Erotic ist der Schlüssel!

Führerschein PRO app shoockygames@gmail.com P4th0f3xile?

GeoSAM2: Use AI to segment a 3d model (or merge parts)

Learn traffic rules

• Suggested IDE: vscode
  • YAML extension by Red Hat, configure in the extension settings the YAML schema and set this in the settings.json: `"yaml.schemas": {

        "kubernetes": "*.yaml"

    }` - restart the IDE afterwards

• kubectl
  • has very good --help options even on subcommands! with example commands
  • kubectl run nginx --image=nginx will fetch the nginx image from docker hub and create a pod
  • kubectl create deployment nginx --image=nginx creates a deployment
  • kubectl create -f pod-definition.yml create from file (kubectl apply -f file.yml works too?)
  • kubectl get pods
  • kubectl set image deployment/nginx busybox=buysbox nginx=nginx:1.9.1 (or pod/nginx ...)
    • maybe also try kubectl edit ...
    • or change the yaml file and do kubectl apply -f redis.yaml
  • kubectl describe pod myapp-pod
  • kubectl run redis --image=redis123 --dry-run=client -o yaml > redis.yaml create yaml specification file for a pod
  • kubectl get replicaset and kubectl get replicacontroller
  • kubectl scale --replicas=6 -f replicaset-definition.yml better than kubectl scale --replicas=6 replicaset myapp-replicaset because latter only modifies deployed definition and not source file
  • kubectl apply -f replicaset-definition.yml
  • kubectl get all (lists deployment, then replicaset, then pods)
• scaling: we create additional pods. a pod can contain multiple containers but one pod shall only contain what is necessary for one instance of the application. we do NOT create additional containers in the same pod
• deployment: recreate (all down, then all new up) vs rollingUpdate (default, scales down/up replicasets by one at a time). kubectl rollout undo deployment/myapp-deployment will roll back
• minikube: bundles master node programs and node programs on one machine. requires virtualization (via hypervisor KVM, VirtualBox... or docker but latter is not recommended)
• ctr: CLI for containerD, not very user friendly and mostly for debugging
  • It is advised to use nerdctl instead
• nerdctl: provides docker-like CLI for containerd, supports docker compose, supports newest features in containerD (encrypted container images, lazy pulling...)
• crictl: provides a CLI for CRI-compatible container runtimes, installed separately, used to inspect and debug container runtimes (not to create containers ideally), works across different runtimes
  • crictl pods shows pods
  • crictl --runtime endpoint enables you to specify a runtime endpoint (or use CONTAINER_RUNTIME_ENDPOINT env var)
  • other commands are similar to docker

Kubernetes definition file:

apiVersion: v1
kind: Pod
metadata:  //dictionary, can only have name and labels
	name: myapp-pod
	labels: // can have any sub-attributes
		app: myapp
spec:  //individual for all deployments
  containers:
    - name: nginx-container
      image: nginx

Glossary

• CRI: Container Runtime Interface
  • Kubernetes originally only worked for Docker but then introduced the CRI to be more abstract and allow all sorts of container runtimes
• OCI: Open Container Initiative
  • imagespec: specification on how an image should be build
  • runtimespec: standards on how a container runtime shall be deployed