Kubernetes
Preferred Kubernetes environments are Minikube, Kind and K3s. It's depends on your use case.
- Minikube: Getting started with Fully Kubernetes environment
- Kind: Kubernetes environment for clusters and more than a single node
- K3s: Kubernetes environment for a low spec machine that uses fewer resources
| Nature | Minikube | Kind | K3s |
|---|---|---|---|
| Runtimes | VM |
Container |
Native
|
| CPU Architectures | AMD64 |
AMD64 |
AMD64, ARMv7, ARM64
|
| Container Runtimes | Docker, CRI-O, containerd, gvisor |
Docker |
Docker, containerd
|
| Startup Time | 5:19 / 3:15 |
2:48 / 1:06 |
0:15 / 0:15
|
| Memory | 2GB |
8GB (Windows, MacOS) |
512 MB
|
| Root Access Required | ✕ |
✕ |
✓
|
| Multi-Cluster | ✓ |
✓ |
✕
|
| Multi-Node | ✕ |
✓ |
✓
|
| Project Home | Minikube | Kind | K3s |
Install
Minikube
Get-ComputerInfo OsName,OsVersion,OsBuildNumber
choco install docker-desktop -y
choco install minikube -y
# minikube start --driver=hyperv
# minikube start --driver=none
minikube start
minikube delete
minikube start --v=7
kubectl get nodes
Kind
choco install kubernetes-cli -y
choco install kind -y
# kind create cluster
# kind delete cluster
kind create cluster --name k8s-ns12-pc04
# kind delete cluster --name k8s-ns12-pc04
kubectl cluster-info --context kind-k8s-ns12-pc04
cat <<EOF > kind-config.yaml
kind: Cluster
apiVersion: kind.x-k8s.io/v1alpha4
nodes:
- role: control-plane
- role: worker
- role: worker
EOF
K3s
choco install multipass -y
multipass launch -n node1
multipass list
multipass set local.driver=hyperv
multipass set local.driver=virtualbox
Get-NetConnectionProfile
Set-NetConnectionProfile -InterfaceIndex 13 -NetworkCategory Private
multipass list
cat C:\Windows\System32\drivers\etc\hosts.ics
multipass delete --purge --all
multipass exec node1 -- bash -c "curl -sfL https://get.k3s.io | sh -"
multipass exec node1 -- sudo kubectl get nodes
Ubuntu
sudo apt remove docker docker-engine docker.io containerd runc sudo apt install ca-certificates curl gnupg lsb-release
sudo su
cat << \EOF >> /etc/docker/daemon.json
{
"exec-opts": [
"native.cgroupdriver=systemd"
],
"log-driver": "json-file",
"log-opts": {
"max-size": "100m"
},
"storage-driver": "overlay2"
}
EOF
exit
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add - sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable"
curl https://packages.cloud.google.com/apt/doc/apt-key.gpg | sudo apt-key add - curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | sudo apt-key add - cat << EOF | sudo tee /etc/apt/sources.list.d/kubernetes.list deb https://apt.kubernetes.io/ kubernetes-xenial main EOF
sudo apt update && sudo apt install -y apt-transport-https curl sudo apt install -y docker-ce=5:20.10.16~3-0~ubuntu-focal\ kubelet=1.24.0-00 kubeadm=1.24.0-00 kubectl=1.24.0-00 sudo apt-mark hold docker-ce kubelet kubeadm kubectl sudo apt install docker-compose
echo "net.bridge.bridge-nf-call-iptables=1" |\ sudo tee -a /etc/sysctl.conf sudo sysctl --system sudo sysctl -p
sudo kubeadm init --pod-network-cidr=10.21.0.0/16
docker config sudo usermod -aG docker $USER newgrp docker mkdir -p $HOME/.docker sudo chown $(id -u):$(id -g) $HOME/.docker -R sudo chmod g+rwx $HOME/.docker -R
kube config mkdir -p $HOME/.kube sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config sudo chown $(id -u):$(id -g) $HOME/.kube/config
network overlay kubectl apply -f\ https://docs.projectcalico.org/v3.14/manifests/calico.yaml
join worker nodes kubeadm token create --print-join-command kubectl get nodes
evil most things for docker0 bridge sudo apt remove netscript-2.4 sudo apt purge netscript-2.4 sudo apt autoremove
Knowledge
cat /proc/cgroups sudo apt install upx-ucl dpkg --print-architecture
apt-cache madison kubelet apt-cache madison kubeadm apt-cache madison kubectl apt-cache madison docker-ce
journalctl -fu docker
journalctl -u kubelet
sudo rm -rf /root/.kube
rm -rf /home/${USER}/.kube
sudo rm -rf /etc/kubernetes
sudo rm -rf /var/lib/kubelet
sudo rm /etc/containerd/config.toml
sudo systemctl daemon-reload systemctl restart containerd sudo systemctl restart docker sudo systemctl enable docker
# sudo ifup docker0
# sudo ifdown docker0
# sudo apt install netscript
# sudo apt install cgroup-tools
sudo systemctl restart NetworkManager
sudo systemctl restart systemd-resolved
<source>
sudo systemctl daemon-reload
sudo kubeadm reset --ignore-preflight-errors --v=5
sudo apt purge docker-ce kubelet kubeadm kubectl
sudo apt autoremove docker-ce kubelet kubeadm kubectl
sudo apt-mark unhold docker-ce kubelet kubeadm kubectl
<source lang="powershell">
choco -v
wsl -l -v
wsl --list --verbose
Restart-Service LxssManager
Get-WindowsOptionalFeature -Online -FeatureName Microsoft-Hyper-V
Disable-WindowsOptionalFeature -Online -FeatureName Microsoft-Hyper-V
#Enable-WindowsOptionalFeature -Online -FeatureName Microsoft-Hyper-V -All
apt install -y conntrack
apt install -yqq daemonize dbus-user-session fontconfig
docker --help
docker version
kubectl proxy
kubectl --help
kubectl version
kubectl get nodes
kubectl cluster-info
kubectl cluster-info dump
kubectl cluster-info --context kind-kind
kubectl get all --all-namespaces
kubectl get all --namespace kubernetes-dashboard
kubectl patch node $NODENAME -p '{"metadata":{"finalizers":[]}}' --type=merge
kubectl -n kubernetes-dashboard describe secret $(kubectl -n kubernetes-dashboard get secret | grep admin-user | awk '{print $1}')