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vault backup: 2025-08-16 13:44:43

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@ -20,7 +20,21 @@ For a weak, dont do things you know are vad and do things you know are good for
Learn traffic rules Learn traffic rules
Earn IBM Fullstack developer certificate (but afte) Earn IBM Fullstack developer certificate (but afte)
- 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
- `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 describe pod myapp-pod`
- 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
- 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 - ctr: CLI for containerD, not very user friendly and mostly for debugging
- It is advised to use nerdctl instead - 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...) - nerdctl: provides docker-like CLI for containerd, supports docker compose, supports newest features in containerD (encrypted container images, lazy pulling...)
@ -28,6 +42,21 @@ Earn IBM Fullstack developer certificate (but afte)
- `crictl pods` shows pods - `crictl pods` shows pods
- `crictl --runtime endpoint` enables you to specify a runtime endpoint (or use CONTAINER_RUNTIME_ENDPOINT env var) - `crictl --runtime endpoint` enables you to specify a runtime endpoint (or use CONTAINER_RUNTIME_ENDPOINT env var)
- other commands are similar to docker - other commands are similar to docker
Kubernetes definition file:
```yml
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 ## Glossary
- CRI: Container Runtime Interface - 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 - Kubernetes originally only worked for Docker but then introduced the CRI to be more abstract and allow all sorts of container runtimes