Prerequisites:
– Disable swap
– Disable SElinux
– Disable Firewalld(optional if all k8 rule added)
Servers IP:
kmaster1 = 192.168.0.10
knode1 = 192.168.0.11
knode2 = 192.168.0.12
#Disable swap
swapoff -a
swapline=$(cat -n /etc/fstab | grep swap | awk '{print $1}')
if [ $(cat /etc/fstab | grep swap | awk '{print substr($0,0,1)}') != "#" ]
then
sed -i ""$swapline"s/.*/#&/" /etc/fstab
fi
#Disable SElinux
setenforce 0
sed -i 's/^SELINUX=enforcing$/SELINUX=permissive/' /etc/selinux/config
#Disable firewalld
systemctl stop firewalld
systemctl disable firewalld
#iptables conf
echo 'net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1' > /etc/sysctl.d/k8.conf
sysctl --system
Add Kubernetes Repository
echo '[kubernetes]
name=Kubernetes
baseurl=https://packages.cloud.google.com/yum/repos/kubernetes-el7-x86_64
enabled=1
gpgcheck=1
repo_gpgcheck=1
gpgkey=https://packages.cloud.google.com/yum/doc/yum-key.gpg https://packages.cloud.google.com/yum/doc/rpm-package-key.gpg
' > /etc/yum.repos.d/kubernetes.repo
On kmaster01
yum install -y kubelet kubeadm kubectl docker
systemctl enable kubelet
systemctl start kubelet
systemctl enable docker
systemctl start docker
hostnamectl set-hostname kmaster01
kubeadm init
At end of above command run below command and save the join command.
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config
AND note the join command
Apply weave network:
kubectl apply -f "https://cloud.weave.works/k8s/net?k8s-version=$(kubectl version | base64 | tr -d '\n')"
On knode1:
yum install -y kubelet kubeadm kubectl docker
systemctl enable kubelet
systemctl start kubelet
systemctl enable docker
systemctl start docker
hostnamectl set-hostname knode1
#Join command
kubeadm join 192.168.0.10:6443 --token lfh49o.f9na1435g8vs1fmt \
--discovery-token-ca-cert-hash sha256:0064f08a4c0ef36e454b683f61a68e0bf78d9cdb45f7905128c68b28fc2a5b3e
On knode2:
yum install -y kubelet kubeadm kubectl docker
systemctl enable kubelet
systemctl start kubelet
systemctl enable docker
systemctl start docker
hostnamectl set-hostname knode2
#Join command
kubeadm join 192.168.0.10:6443 --token lfh49o.f9na1435g8vs1fmt \
--discovery-token-ca-cert-hash sha256:0064f08a4c0ef36e454b683f61a68e0bf78d9cdb45f7905128c68b28fc2a5b3e
nginx-app.yml
apiVersion: apps/v1
kind: Deployment
metadata:
name: my-nginx
spec:
selector:
matchLabels:
run: my-nginx
replicas: 2
template:
metadata:
labels:
run: my-nginx
spec:
containers:
- name: my-nginx
image: nginx
ports:
- containerPort: 80
nginx-svc.yml
apiVersion: v1
kind: Service
metadata:
name: nginx-svc
labels:
run: nginx-svc
spec:
type: NodePort
ports:
- port: 80
protocol: TCP
selector:
run: my-nginx
kubectl apply -f ngix-app.yml
kubectl apply -f ngix-svc.yml
