setup-master.sh

#!/bin/bash

# Kubernetes Master Setup

LOG=/tmp/kube-master.log 
rm -f $LOG

## Source Common Functions
curl -s "https://raw.githubusercontent.com/linuxautomations/scripts/master/common-functions.sh" >/tmp/common-functions.sh
source /tmp/common-functions.sh

## Checking Root User or not.
CheckRoot

## Checking SELINUX Enabled or not.
CheckSELinux

## Checking Firewall on the Server.
CheckFirewall

## Setting Up Docker Repository.
DockerCERepo

## Installing Docker
yum install bind-utils docker-ce http://mirror.centos.org/centos/7/extras/x86_64/Packages/container-selinux-2.21-1.el7.noarch.rpm -y &>/dev/null
#yum install docker -y
if [ $? -eq 0 ]; then  
	success "Installed Docker-CE Successfully"
else
	error "Installing Docker-CE Failure"
	exit 1
fi

## Starting Docker Service
systemctl enable docker &>/dev/null
systemctl start docker &>/dev/null
if [ $? -eq 0 ]; then 
	success "Started Docker Engine Successfully"
else
	error "Starting Docker Engine Failed"
	exit 1
fi

#yum install docker -y &>>$LOG
#systemctl enable docker &>>$LOG
#systemctl start docker  

echo '[kubernetes]
name=Kubernetes
baseurl=https://packages.cloud.google.com/yum/repos/kubernetes-el7-$basearch
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

yum install -y kubelet kubeadm kubectl &>>$LOG
Stat $? "Installing Kubelet Service"

systemctl enable kubelet  &>/dev/null

#systemctl start kubelet &>>$LOG 
#Stat $? "Starting Kubelet Service"

echo 'net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1' > /etc/sysctl.d/k8s.conf
sysctl --system &>> $LOG
Stat $? "Updating Network Configuration" 

sed -i "s/cgroup-driver=systemd/cgroup-driver=cgroupfs/g" /etc/systemd/system/kubelet.service.d/10-kubeadm.conf
systemctl daemon-reload &>/dev/null
systemctl restart kubelet &>>$LOG 
Stat $? "Retarting Kubelet Service"

sysctl net.bridge.bridge-nf-call-iptables=1 &>/dev/null 
kubeadm init --pod-network-cidr=10.244.0.0/16 &>$LOG 
STAT=$?
Stat $? "Initializing Kubernetes Cluster"

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://raw.githubusercontent.com/coreos/flannel/v0.9.1/Documentation/kube-flannel.yml &>/dev/null 
Stat $? "Setting Up Flanneld Network"
sleep 30
i=120
while true ; do 
    kubectl get pods  --all-namespaces | grep kube-system | awk '{print $4}' | grep -v Running &>/dev/null 
    if [ $? -ne 0 ]; then 
        Stat 0 "Network Configuration Completed"
        break
    else 
        i=$(($i-1))
        if [ $i -lt 0 ]; then 
            Stat 1 "Network Configuration Failed"
        fi 
        continue
    fi
done
hint "Join the nodes using the following command"
cat $LOG | /bin/grep join