"# Kubernetes-master-client" Agenda:- Installing and setup kubernetes master client architecture here using kubeadm.
Pre-requisite:-
In this setup we wil required two vm with below specification 2vcp, 4gb ram, atleast 8gb disk Both vm should have good network connectivity below port should be open at both node 6443,22,80,443
Steps:- We will devide this steps here in two part master's steps and worker's steps.
Steps required to run on master machine.
Step 1) update and upgrade the machine then setup hostname and /etc/hosts file.
sudo su -
sudo apt update
sudo apt -y full-upgrade
hostnamectl set-hostname master-node
vi /etc/hosts
master-node-ip master-node
worker-node-ip worker-node
Step 2) Install kubelet, kubeadm and kubectl
sudo apt -y install curl apt-transport-https
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" | sudo tee /etc/apt/sources.list.d/kubernetes.list
Step 3) Install required packages.
sudo apt update
sudo apt -y install vim git curl wget kubelet kubeadm kubectl
sudo apt-mark hold kubelet kubeadm kubectl
kubectl version --client && kubeadm version //verify installed package
Step 4) Disable Swap
sudo sed -i '/ swap / s/^\(.*\)$/#\1/g' /etc/fstab
sudo swapoff -a
sudo mount -a
free -h
Step 5) Enable kernel modules and configure sysctl.
# Enable kernel modules
sudo modprobe overlay
sudo modprobe br_netfilter
# Add some settings to sysctl
sudo tee /etc/sysctl.d/kubernetes.conf<<EOF
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
net.ipv4.ip_forward = 1
EOF
# Reload sysctl
sudo sysctl --system
Step 6) Install Container runtime (Installing CRI-O:)
# Ensure you load modules
sudo modprobe overlay
sudo modprobe br_netfilter
# Set up required sysctl params
sudo tee /etc/sysctl.d/kubernetes.conf<<EOF
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
net.ipv4.ip_forward = 1
EOF
# Reload sysctl
sudo sysctl --system
# Add Cri-o repo
sudo su -
OS="xUbuntu_20.04"
VERSION=1.25
echo "deb https://download.opensuse.org/repositories/devel:/kubic:/libcontainers:/stable/$OS/ /" > /etc/apt/sources.list.d/devel:kubic:libcontainers:stable.list
echo "deb http://download.opensuse.org/repositories/devel:/kubic:/libcontainers:/stable:/cri-o:/$VERSION/$OS/ /" > /etc/apt/sources.list.d/devel:kubic:libcontainers:stable:cri-o:$VERSION.list
curl -L https://download.opensuse.org/repositories/devel:kubic:libcontainers:stable:cri-o:$VERSION/$OS/Release.key | apt-key add -
curl -L https://download.opensuse.org/repositories/devel:/kubic:/libcontainers:/stable/$OS/Release.key | apt-key add -
# Install CRI-O
sudo apt update
sudo apt install cri-o cri-o-runc
# Update CRI-O CIDR subnet
sudo sed -i 's/10.85.0.0/192.168.0.0/g' /etc/cni/net.d/100-crio-bridge.conf
# Start and enable Service
sudo systemctl daemon-reload
sudo systemctl restart crio
sudo systemctl enable crio
sudo systemctl status crio
Step 7) Initialize master node
lsmod | grep br_netfilter
sudo systemctl enable kubelet
sudo kubeadm config images pull --cri-socket unix:///var/run/crio/crio.sock
sudo kubeadm init \
--pod-network-cidr=192.168.0.0/16 \
--cri-socket unix:///var/run/crio/crio.sock \
--upload-certs \
--control-plane-endpoint=master-node
Step 8) copy join token for running on worker node.
Step 9) Setup kubeconfig folder
mkdir -p $HOME/.kube
sudo cp -f /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config
Steps required to run on worker node
Step 1) update and upgrade the machine then setup hostname and /etc/hosts file.
sudo su -
sudo apt update
sudo apt -y full-upgrade
hostnamectl set-hostname worker-node
vi /etc/hosts
master-node-ip master-node
worker-node-ip worker-node
Step 2) Install kubelet, kubeadm and kubectl
sudo apt -y install curl apt-transport-https
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" | sudo tee /etc/apt/sources.list.d/kubernetes.list
Step 3) Install required packages.
sudo apt update
sudo apt -y install vim git curl wget kubelet kubeadm kubectl
sudo apt-mark hold kubelet kubeadm kubectl
kubectl version --client && kubeadm version //verify installed package
Step 4) Disable Swap
sudo sed -i '/ swap / s/^\(.*\)$/#\1/g' /etc/fstab
sudo swapoff -a
sudo mount -a
free -h
Step 5) Enable kernel modules and configure sysctl.
# Enable kernel modules
sudo modprobe overlay
sudo modprobe br_netfilter
# Add some settings to sysctl
sudo tee /etc/sysctl.d/kubernetes.conf<<EOF
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
net.ipv4.ip_forward = 1
EOF
# Reload sysctl
sudo sysctl --system
Step 6) Install Container runtime (Installing CRI-O:)
# Ensure you load modules
sudo modprobe overlay
sudo modprobe br_netfilter
# Set up required sysctl params
sudo tee /etc/sysctl.d/kubernetes.conf<<EOF
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
net.ipv4.ip_forward = 1
EOF
# Reload sysctl
sudo sysctl --system
# Add Cri-o repo
OS="xUbuntu_20.04"
VERSION=1.25
echo "deb https://download.opensuse.org/repositories/devel:/kubic:/libcontainers:/stable/$OS/ /" > /etc/apt/sources.list.d/devel:kubic:libcontainers:stable.list
echo "deb http://download.opensuse.org/repositories/devel:/kubic:/libcontainers:/stable:/cri-o:/$VERSION/$OS/ /" > /etc/apt/sources.list.d/devel:kubic:libcontainers:stable:cri-o:$VERSION.list
curl -L https://download.opensuse.org/repositories/devel:kubic:libcontainers:stable:cri-o:$VERSION/$OS/Release.key | apt-key add -
curl -L https://download.opensuse.org/repositories/devel:/kubic:/libcontainers:/stable/$OS/Release.key | apt-key add -
# Install CRI-O
sudo apt update
sudo apt install cri-o cri-o-runc
# Update CRI-O CIDR subnet
sudo sed -i 's/10.85.0.0/192.168.0.0/g' /etc/cni/net.d/100-crio-bridge.conf
# Start and enable Service
sudo systemctl daemon-reload
sudo systemctl restart crio
sudo systemctl enable crio
sudo systemctl status crio
Step 7) Enable kubelet
lsmod | grep br_netfilter
sudo systemctl enable kubelet
Step 8) Need to run join command on worker node with was generated while we ran kubeadm init command at master node.
Run below command to verify added node in cluster
kubectl get nodes
###########Thank you############### Please like and share this video This installation document is available at below git link https://github.com/LOKI0307/Kubernetes-master-client Bye
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