Kubernetes
Links
- Kubernetes: https://kubernetes.io/
- kubectl
- Doc: https://kubernetes.io/docs/reference/kubectl/overview/
- Install and Set Up kubectl: https://kubernetes.io/docs/tasks/tools/install-kubectl/
- minikube
Commands
- Minikube commands: https://minikube.sigs.k8s.io/docs/commands/
- Start local
Kubernetes:
minikube start - Stop local Kubernetes
cluster:
minikube stop - Get status of local
Kubernetes:
minikube status - Start old version (
1.15.0 for example):minikube start -p aged --kubernetes-version=v1.15.0 - list services:
minikube service list - get Kubernetes URL for a service:
minikube service <resource_name> - start the dashboard:
minikube dashboard - get minikube version:
minikube version
- Start local
Kubernetes:
- kubectl Commands:
https://kubernetes.io/docs/reference/kubectl/overview/
- get info about the cluster:
kubectl cluster-info - Get version of k8s:
kubectl version - display all pods across all namespaces:
kubectl get pods -A - display state of resource:
kubectl describe service <resource_name> - display infos of resource:
kubectl get services <resource_name> - delete deployment:
kubectl delete deployment <deployment_name> - namespace commands
- List namespaces:
kubectl get namespace - Create namespace:
kubectl create namespace <namespace_name>
- List namespaces:
- get info about the cluster:
Installation
- install Minikube: https://minikube.sigs.k8s.io/docs/start/
- install KVM: https://help.ubuntu.com/community/KVM/Installation
First starts looks like this:
$ minikube start
😄 minikube v1.13.0 on Ubuntu 18.04
✨ Automatically selected the kvm2 driver
💾 Downloading driver docker-machine-driver-kvm2:
> docker-machine-driver-kvm2.sha256: 65 B / 65 B [-------] 100.00% ? p/s 0s
> docker-machine-driver-kvm2: 13.81 MiB / 13.81 MiB 100.00% 1.13 MiB p/s 1
💿 Downloading VM boot image ...
> minikube-v1.13.0.iso.sha256: 65 B / 65 B [-------------] 100.00% ? p/s 0s
> minikube-v1.13.0.iso: 173.73 MiB / 173.73 MiB 100.00% 1.61 MiB p/s 1m48s
👍 Starting control plane node minikube in cluster minikube
💾 Downloading Kubernetes v1.19.0 preload ...
> preloaded-images-k8s-v6-v1.19.0-docker-overlay2-amd64.tar.lz4: 486.28 MiB
🔥 Creating kvm2 VM (CPUs=2, Memory=2200MB, Disk=20000MB) ...
🐳 Preparing Kubernetes v1.19.0 on Docker 19.03.12 ...
🔎 Verifying Kubernetes components...
🌟 Enabled addons: default-storageclass, storage-provisioner
💡 kubectl not found. If you need it, try: 'minikube kubectl -- get pods -A'
🏄 Done! kubectl is now configured to use "minikube" by default
Helm
The package manager for Kubernetes
- https://helm.sh/
- Install: https://docs.helm.sh/docs/intro/install/
- Commands
- add a chart repository (example):
$ helm repo add stable https://kubernetes-charts.storage.googleapis.com/ - list the charts you can install:
helm search repo stable
- add a chart repository (example):
If install fails with Error: cannot re-use a name that is still in use
the --replace flag can be used.
Post Setup Examples
After setup:
$ kubectl get pods -A
NAMESPACE NAME READY STATUS RESTARTS AGE
kube-system coredns-f9fd979d6-r2vhj 1/1 Running 2 3h49m
kube-system etcd-minikube 1/1 Running 2 3h49m
kube-system kube-apiserver-minikube 1/1 Running 2 3h49m
kube-system kube-controller-manager-minikube 1/1 Running 2 3h49m
kube-system kube-proxy-tnk8g 1/1 Running 2 3h49m
kube-system kube-scheduler-minikube 1/1 Running 2 3h49m
kube-system storage-provisioner 1/1 Running 5 3h49m
kubernetes-dashboard dashboard-metrics-scraper-c95fcf479-b92v2 1/1 Running 2 3h45m
kubernetes-dashboard kubernetes-dashboard-5c448bc4bf-tttfg 1/1 Running 2 3h45m
Last modified July 16, 2022: fix headlines in IT doc (9d350ef)