Install kubernetes with kubeadm

Kubeadm is a tool that helps you bootstrap a simple Kubernetes cluster and simplifies the deployment process.

Parts of the Kubernetes series

• Part1a: Install K8S with ansible
• Part1b: Install K8S with kubeadm
• Part1c: Install K8S with kubeadm and containerd
• Part1d: Install K8S with kubeadm and allow swap
• Part1e: Install K8S with kubeadm in HA mode
• Part2: Intall metal-lb with K8S
• Part2: Intall metal-lb with BGP
• Part3: Install Nginx ingress to K8S
• Part4: Install cert-manager to K8S
• Part5a: Use local persisten volume with K8S
• Part5b: Use ceph persisten volume with K8S
• Part5c: Use ceph CSI persisten volume with K8S
• Part5d: Kubernetes CephFS volume with CSI driver
• Part5e: Use Project Longhorn as persisten volume with K8S
• Part5f: Use OpenEBS as persisten volume with K8S
• Part5f: vSphere persistent storage for K8S
• Part6: Kubernetes volume expansion with Ceph RBD CSI driver
• Part7a: Install k8s with IPVS mode
• Part7b: Install k8s with IPVS mode
• Part8: Use Helm with K8S
• Part9: Tillerless helm2 install
• Part10: Kubernetes Dashboard SSO
• Part11: Kuberos for K8S
• Part12: Gangway for K8S
• Part13a: Velero Backup for K8S
• Part13b: How to Backup Kubernetes to git?
• Part14a: K8S Logging And Monitoring
• Part14b: Install Grafana Loki with Helm3

192.168.1.41  kubernetes01 # master node
192.168.1.42  kubernetes02 # frontend node
192.168.1.43  kubernetes03 # worker node
192.168.1.44  kubernetes04 # worker node
192.168.1.45  kubernetes05 # worker node

# hardware requirement
4 CPU
16G RAM

Install Docker

apt-get update
apt-get install apt-transport-https ca-certificates curl gnupg2 software-properties-common
curl -fsSL https://download.docker.com/linux/debian/gpg | sudo apt-key add -
add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/debian $(lsb_release -cs) stable"
apt-get update
apt-get install docker-ce docker-ce-cli containerd.io
systemct start docker
systemct enable docker

Configuuration

cat <<EOF >  /etc/sysctl.d/k8s.conf
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
EOF

echo '1' > /proc/sys/net/ipv4/ip_forward
echo '1' > /proc/sys/net/bridge/bridge-nf-call-iptables

Disable swap

free -h
swapoff -a
swapoff -a
sed -i.bak -r 's/(.+ swap .+)/#\1/' /etc/fstab
free -h

Install kubeadm

apt-get install ebtables ethtool apt-transport-https

curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | apt-key add -
cat <<EOF >/etc/apt/sources.list.d/kubernetes.list
deb http://apt.kubernetes.io/ kubernetes-xenial main
EOF

apt-get update && apt-get install -y kubelet kubeadm kubectl
apt-mark hold kubelet kubeadm kubect
systemctl enable kubelet && systemctl start kubelet
kubeadm config images pul

Init master

kubeadm init --pod-network-cidr=10.244.0.0/16 --apiserver-advertise-address=192.168.1.41


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


kubectl apply -f https://github.com/coreos/flannel/raw/master/Documentation/kube-flannel.yml

Join workers to cluster

kubeadm join 192.168.1.41:6443 --token XXXXXXXX \
    --discovery-token-ca-cert-hash sha256:XXXXXXXX