Deploying and managing production-grade etcd clusters on cloud providers: failure recovery, disaster recovery, backups and resizing.

Kubernetes Install On Ubuntu 20.4 Install Docker ************************************************************ sudo apt-get remove docker docker-engine docker.io containerd runc sudo apt-get update curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o /usr/share/keyrings/docker-archive-keyring.gpg echo "deb [arch=$(dpkg --print-architecture) signed-by=/usr/share/keyrings/docker-archive-keyring.gpg] https://download.docker.com/linux/ubuntu \ $(lsb_release -cs) stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null sudo apt-get update systemctl stauts docker systemctl status docker sudo mkdir /etc/docker cat <<EOF | sudo tee /etc/docker/daemon.json { "exec-opts": ["native.cgroupdriver=systemd"], "log-driver": "json-file", "log-opts": { "max-size": "100m" }, "storage-driver": "overlay2" } EOF sudo systemctl enable docker sudo systemctl daemon-reload sudo systemctl restart docker Follow the step for all nodes to install Kubernetes ******************************************** sudo apt update sudo apt -y upgrade && sudo systemctl reboot sudo apt install apt-transport-https curl curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | sudo apt-key add echo "deb https://apt.kubernetes.io/ kubernetes-xenial main" >> ~/kubernetes.list sudo apt update sudo mv ~/kubernetes.list /etc/apt/sources.list.d sudo apt update sudo apt-get install -y kubelet kubeadm kubectl kubernetes-cni docker version sudo swapoff -a vim /etc/fstab free -mh lsmod | grep br_netfilter sudo modprobe br_netfilter lsmod | grep br_netfilter sudo sysctl net.bridge.bridge-nf-call-iptables=1 ************************************************************ ********************************************************** *********************************************************** sudo kubeadm init --pod-network-cidr=10.244.0.0/16 mkdir -p $HOME/.kube kubectl get node kubectl get pod -A kubectl get node kubectl get pod -A kubectl get node kubectl get componentstatus kubectl get node kubectl get pod -A wget https://docs.projectcalico.org/manifests/custom-resources.yaml ;;;edit and set ip block is 10.244.0.0/16 wget https://docs.projectcalico.org/manifests/tigera-operator.yaml kubectl create -f tigera-operator.yaml kubectl create -f custom-resources.yaml Finally Check the Cluster Status *************************************************************************************** root@master:~# kubectl get pods --all-namespaces NAMESPACE NAME READY STATUS RESTARTS AGE calico-apiserver calico-apiserver-5b68b6b54-mp6zg 1/1 Running 0 20m calico-apiserver calico-apiserver-5b68b6b54-tgksb 1/1 Running 0 20m calico-system calico-kube-controllers-59c45ff85c-pfnvq 1/1 Running 0 22m calico-system calico-node-6b2p9 1/1 Running 0 22m calico-system calico-node-phsp7 1/1 Running 0 22m calico-system calico-node-r6w5p 1/1 Running 0 22m calico-system calico-typha-589df868cc-7s66z 1/1 Running 0 22m calico-system calico-typha-589df868cc-n4b97 1/1 Running 0 22m kube-system coredns-64897985d-7fjvc 1/1 Running 0 28m kube-system coredns-64897985d-d8t7c 1/1 Running 0 28m kube-system etcd-master 1/1 Running 0 29m kube-system kube-apiserver-master 1/1 Running 0 29m kube-system kube-controller-manager-master 1/1 Running 0 29m kube-system kube-proxy-7fwnf 1/1 Running 0 27m kube-system kube-proxy-hp4j8 1/1 Running 0 28m kube-system kube-proxy-xzq9f 1/1 Running 0 27m kube-system kube-scheduler-master 1/1 Running 0 29m tigera-operator tigera-operator-59d6fdcd79-ndwsk 1/1 Running 0 25m root@master:~# kubectl get componentstatus Warning: v1 ComponentStatus is deprecated in v1.19+ NAME STATUS MESSAGE ERROR controller-manager Healthy ok scheduler Healthy ok etcd-0 Healthy {"health":"true","reason":""} ******************************************************************************** Troubleshooting ************************************************************************************ kubeadm reset iptables -F && iptables -t nat -F && iptables -t mangle -F && iptables -X For Joining Token ******************************** kubeadm token create --print-join-command