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Installation of Kubernetes.md

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Installation of Kubernets on AWS EC2 Single Node cluster

Below are the steps to install the Kubernets on EC2

Ports that need to enable

Protocal Direction Port-Range Purpose Used By
TCP Inbound 6443* Kubernetes API server All
TCP Inbound 2379- 2380 etcd server client api kube-apiserver , etcd
TCP Inbound 10250 Kubelet API Self control,plane
TCP Inbound 10251 Kube-Schedular Self
TCP Inbound 30000-32767 Nodeport-services+ All
TCP Inbound 10252 Kube-controller manager Self
TCP Ibound 22 SSH Self
TCP Ibnound 80 HTTP Self
TCP Inbound 443 HTTPS Self
TCP Inbound 5432 Postgres postgres

Step 1.

sudo su  // Take the super user access 

setenforce 0

To disable SELinux temporarily (disable the security of Linux)

Step 2.

free -h 

The free command gives information about used and unused memory usage and swap memory of a system.

Step 3.

 
swapoff -a

To deactivate a swap space, use the command swapoff

Step 4.

Ubuntu 16.04 has reported issues with traffic being routed incorrectly due to iptables being bypassed. Ensure net.bridge.bridge-nf-call-iptables is set to 1 in the sysctl config,

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

Step 5.

Installaton of Docker 

yum install docker 

systemctl enable docker 

systemctl start docker

Step 6.

To configure the Kubernetes package in the System we will use this command.

cat <<EOF > /etc/yum.repos.d/kubernetes.repo
[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
EOF

Step 7.

installation of Kubelet , Kubeadm, Kubectl

Kubelet : The kubelet is the primary "node agent" that runs on each node.

Kubeadm: Kubeadm is a tool built to provide kubeadm init and kubeadm join as best-practice "fast paths" for creating Kubernetes clusters.

Kubectl: The Kubernetes command-line tool, kubectl, allows you to run commands against Kubernetes clusters.

yum install kubeadm kubectl kubelet

systemctl status kubelet

kubeadm init

mkdir -p $HOME/.kube
 
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config

sudo chown $(id -u):$(id -g) $HOME/.kube/config

Step 8.

This commend used to make master as a worker in Single node cluster
kubectl taint nodes --all node-role.kubernetes.io/master-

To apply pods network communication we use calico network
kubectl apply -f https://docs.projectcalico.org/v3.9/manifests/calico.yaml 

to see the list of Pods we will use this command 
kubectl get pods --all-namespaces