Kubernetes: Difference between revisions

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* [https://kubernetes.io/docs/tutorials/stateless-application/ K8s Stateless Applications]
* [https://kubernetes.io/docs/tutorials/stateless-application/ K8s Stateless Applications]
* [https://kubernetes.io/docs/tutorials/stateful-application/ K8s Stateful Applications]
* [https://kubernetes.io/docs/tutorials/stateful-application/ K8s Stateful Applications]
* [[K8s/CSI Hostpath Driver|K8s » CSI Hostpath Driver]]
* [https://kubernetes.io/docs/home/ Kubernetes Documents]
* [https://kubernetes.io/docs/home/ Kubernetes Documents]
* [https://ubuntu.com/tutorials/how-to-kubernetes-cluster-on-raspberry-pi#4-installing-microk8s Installing MicroK8s]
* [https://ubuntu.com/tutorials/how-to-kubernetes-cluster-on-raspberry-pi#4-installing-microk8s Installing MicroK8s]

Latest revision as of 09:04, 1 August 2024

Preferred Kubernetes environments are Minikube, Kind and K3s. It's depends on your use case.

  1. Minikube: Getting started with Fully Kubernetes environment
  2. Kind: Kubernetes environment for clusters and more than a single node
  3. 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

Minikube

sudo mkdir -p /opt/cli/minikube-linux-amd64/bin
curl -sLO https://storage.googleapis.com/minikube/releases/latest/minikube-linux-amd64
sudo install minikube-linux-amd64 /opt/cli/minikube-linux-amd64/bin/minikube
sudo update-alternatives --install /usr/local/bin/minikube minikube\
 /opt/cli/minikube-linux-amd64/bin/minikube 1980
rm -rf minikube-linux-amd64

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 install kubectl

minikube start
:'
😄  minikube v1.25.2 on Ubuntu 22.04
✨  Automatically selected the docker driver. Other choices: none, ssh
👍  Starting control plane node minikube in cluster minikube
🚜  Pulling base image ...
💾  Downloading Kubernetes v1.23.3 preload ...
    > preloaded-images-k8s-v17-v1...: 505.68 MiB / 505.68 MiB  100.00% 4.60 MiB
    > gcr.io/k8s-minikube/kicbase: 379.06 MiB / 379.06 MiB  100.00% 2.47 MiB p/
🔥  Creating docker container (CPUs=2, Memory=6900MB) ...
🐳  Preparing Kubernetes v1.23.3 on Docker 20.10.12 ...
    ▪ kubelet.housekeeping-interval=5m
    ▪ Generating certificates and keys ...
    ▪ Booting up control plane ...
    ▪ Configuring RBAC rules ...
🔎  Verifying Kubernetes components...
    ▪ Using image gcr.io/k8s-minikube/storage-provisioner:v5
🌟  Enabled addons: storage-provisioner, default-storageclass
🏄  Done! kubectl is now configured to use "minikube" cluster and "default" namespace by default
'

kubectl get po -A
minikube kubectl -- get po -A
:'
NAMESPACE     NAME                               READY   STATUS    RESTARTS        AGE
kube-system   coredns-64897985d-thxhw            1/1     Running   0               8m14s
kube-system   etcd-minikube                      1/1     Running   0               8m26s
kube-system   kube-apiserver-minikube            1/1     Running   0               8m26s
kube-system   kube-controller-manager-minikube   1/1     Running   0               8m26s
kube-system   kube-proxy-xqfl2                   1/1     Running   0               8m13s
kube-system   kube-scheduler-minikube            1/1     Running   0               8m26s
kube-system   storage-provisioner                1/1     Running   1 (7m43s ago)   8m25s
'

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

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

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}')

References

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