kubernetes cluster installation from kubeadm-way

gistfile1.txt

##################### Master Node ##################################################
# Set the hostname
$ hostnamectl set-hostname <enter-hostname>

# To get effect in the system without reboot, run the following command:
$ exec bash

# Do entry in the /etc/hosts for master and worker nodes to identify by it's hostname.
e.g. echo "172.16.238.10     master"  >> /etc/hosts
     echo "172.16.238.11     worker01"  >> /etc/hosts
     echo "172.16.238.12     worker02" >> /etc/hosts
# You can make it passwordless authentication. Easy to access.

# To check the product_uuid in the machine and should be unique otherwise the installation process can be fail. 
# Because kubernetes uses these values to uniquely identify the nodes in the cluster, same terms applicable on MAC address.
# If not available then no issue.
$ sudo cat /sys/class/dmi/id/product_uuid

# To check the IP addr of the current system
$ ip a

# To load bridged Traffic
$ lsmod | grep br_netfilter

# If above result is empty then load it.
$ sudo modprobe br_netfilter

# Enable the kernel bridge traffic
$ cat <<EOF | sudo tee /etc/sysctl.d/k8s.conf
  net.bridge.bridge-nf-call-ip6tables = 1
  net.bridge.bridge-nf-call-iptables = 1
EOF
$ sudo sysctl --system

# Status of swap
$ swapon -s

# Disable the swap
$ swapoff -a

# To disable swap permanent go to /etc/fstab, comment it.

# firewall service should be disable
$ systemctl status firewalld
$ systemctl stop firewalld
$ systemctl disable firewalld


# Check the required port is not opt by other services.
# https://kubernetes.io/docs/setup/production-environment/tools/kubeadm/install-kubeadm/#control-plane-node-s

# Installation Container Runtime
$ apt-get update && apt-get install -y \
  apt-transport-https ca-certificates curl software-properties-common gnupg2

$ curl -fsSL https://download.docker.com/linux/ubuntu/gpg | apt-key add -

$ add-apt-repository \
  "deb [arch=amd64] https://download.docker.com/linux/ubuntu \
  $(lsb_release -cs) \
  stable"
$ apt-get update && apt-get install -y \
  containerd.io=1.2.13-2 \
  docker-ce=5:19.03.11~3-0~ubuntu-$(lsb_release -cs) \
  docker-ce-cli=5:19.03.11~3-0~ubuntu-$(lsb_release -cs)
  
$ cat > /etc/docker/daemon.json <<EOF
{
  "exec-opts": ["native.cgroupdriver=systemd"],
  "log-driver": "json-file",
  "log-opts": {
    "max-size": "100m"
  },
  "storage-driver": "overlay2"
}
EOF

$ mkdir -p /etc/systemd/system/docker.service.d

# Daemon reload & start and enable docker
$ systemctl daemon-reload
$ systemctl enable --now docker

# Installation of kubeadm, kubelet, kubectl
$ sudo apt-get update && sudo apt-get install -y apt-transport-https curl
$ 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-get update
$ sudo apt-get install -y kubelet kubeadm kubectl
$ sudo apt-mark hold kubelet kubeadm kubectl

# restarting the kubelet:
$ sudo systemctl daemon-reload
$ sudo systemctl restart kubelet

# Initializing your control-plane node through kubeadm
$ kubeadm init --apiserver-advertise-address=<main-ip-address> --pod-network-cidr=<ip-addr-pod>

# --pod-network-cidr=10.244.0.0/16
# If you are facing errors and wanna ignore it for now. Then use "--ignore-preflight-errors=all"

$ mkdir -p $HOME/.kube
$ sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
$ sudo chown $(id -u):$(id -g) $HOME/.kube/config
$ export KUBECONFIG=/root/.kube/config

# After completion of kubeadm. You will get kubeadm join script. 
# SAVE it in the FILE for the worker node. Don't generate new one.

# Deploy network plugins only in the master node and before running join script into the worker node. Without network plugins coredns
# will not spin up. We are installing Weave.

$ kubectl apply -f "https://cloud.weave.works/k8s/net?k8s-version=$(kubectl version | base64 | tr -d '\n')"

$ kubectl get nodes
$ kubectl get cs
$ kubectl get po -n kube-system

######################### Worker Node ##########################################################

# Set the hostname
$ hostnamectl set-hostname <enter-hostname>

# To get effect in the system without reboot, run the following command:
$ exec bash

# Do entry in the /etc/hosts for master and worker nodes to identify by it's hostname.
e.g. echo "172.16.238.10     master"  >> /etc/hosts
     echo "172.16.238.11     worker01"  >> /etc/hosts
     echo "172.16.238.12     worker02" >> /etc/hosts
# You can make it passwordless authentication. Easy to access.

# To check the product_uuid in the machine and should be unique otherwise the installation process can be fail. 
# Because kubernetes uses these values to uniquely identify the nodes in the cluster, same terms applicable on MAC address.
# If not available then no issue.
$ sudo cat /sys/class/dmi/id/product_uuid

# To check the IP addr of the current system
$ ip a

# To load bridged Traffic
$ lsmod | grep br_netfilter

# If above result is empty then load it.
$ sudo modprobe br_netfilter

# Enable the kernel bridge traffic
$ cat <<EOF | sudo tee /etc/sysctl.d/k8s.conf
  net.bridge.bridge-nf-call-ip6tables = 1
  net.bridge.bridge-nf-call-iptables = 1
EOF
$ sudo sysctl --system

# Status of swap
$ swapon -s

# Disable the swap
$ swapoff -a

# To disable swap permanent go to /etc/fstab, comment it.

# firewall service should be disable
$ systemctl status firewalld
$ systemctl stop firewalld
$ systemctl disable firewalld


# Check the required port is not opt by other services.
# https://kubernetes.io/docs/setup/production-environment/tools/kubeadm/install-kubeadm/#control-plane-node-s

# Installation Container Runtime
$ apt-get update && apt-get install -y \
  apt-transport-https ca-certificates curl software-properties-common gnupg2

$ curl -fsSL https://download.docker.com/linux/ubuntu/gpg | apt-key add -

$ add-apt-repository \
  "deb [arch=amd64] https://download.docker.com/linux/ubuntu \
  $(lsb_release -cs) \
  stable"
$ apt-get update && apt-get install -y \
  containerd.io=1.2.13-2 \
  docker-ce=5:19.03.11~3-0~ubuntu-$(lsb_release -cs) \
  docker-ce-cli=5:19.03.11~3-0~ubuntu-$(lsb_release -cs)
  
$ cat > /etc/docker/daemon.json <<EOF
{
  "exec-opts": ["native.cgroupdriver=systemd"],
  "log-driver": "json-file",
  "log-opts": {
    "max-size": "100m"
  },
  "storage-driver": "overlay2"
}
EOF

$ mkdir -p /etc/systemd/system/docker.service.d

# Daemon reload & start and enable docker
$ systemctl daemon-reload
$ systemctl enable --now docker

# Installation of kubeadm, kubelet, kubectl
$ sudo apt-get update && sudo apt-get install -y apt-transport-https curl
$ 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-get update
$ sudo apt-get install -y kubelet kubeadm kubectl
$ sudo apt-mark hold kubelet kubeadm kubectl

# restarting the kubelet:
$ sudo systemctl daemon-reload
$ sudo systemctl restart kubelet

# AFTER this run the kubeadm join script which one you saved in the file. If you will face issue then use flag
# "--ignore-preflight-errors=all"

# Hope this will help you to install kubernetes cluster through kubeadm-way!!