kubernetes-cluster-setup-using-kubeadm

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kubernetes-cluster-setup-using-kubeadm

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How to create kubernetes cluster using kubeadm

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# kubernetes-cluster-setup-using-kubeadm
How to create kubernetes cluster using kubeadm

Watch the video :https://youtu.be/cAZ5nkLfL6M

Follow the below steps for creating Kubernetes Cluster on CentOs.

Steps Involved:

1. Set Hostnames
2. Assign Static IP
3. Edit /etc/hosts file
4. Disable SELinux
5. Disable firewall and edit Iptables settings
6. Setup Kubernetes Repo
7. Installing Kubeadm and Docker, Enable and start the services
8. Disable Swap
9. Initialize Kubernetes Cluster
10. Installing Pod Network using Calico network
11. Join Worker Nodes

Steps 1 tp 8 is done on Both Master and worker nodes, Steps 9 & 10 is to be done only on master node, step 11 is done only on worker nodes.

-------------------------------------------------------

**Set Hostnames**

hostnamectl set-hostname k8smaster (On Master) 
hostnamectl set-hostname k8sworker1(On Node1) 
hostnamectl set-hostname k8sworker2 (On Node2)

------------------------------------------------------

**Assign Static IP**

Run nmcli con to indentify the network details.

Go to vi /etc/sysconfig/network-scripts/ and change the settings in ifcfg-ens33 (the name will change based on your network device name) as below.

Below is a sample format

TYPE="Ethernet" 
PROXY_METHOD="none" 
BROWSER_ONLY="no" 
BOOTPROTO="none" 
IPADDR=XXX.XXX.XXX.XXX 
PREFIX=24 
GATEWAY=XXX.XXX.XXX.XXX 
DNS1=192.168.2.254 
DNS2=8.8.8.8 
DNS3=8.8.4.4 
DEFROUTE="yes" 
IPV4_FAILURE_FATAL="no" 
IPV6INIT="no" 
IPV6_AUTOCONF="no" 
IPV6_DEFROUTE="no" 
IPV6_FAILURE_FATAL="no" 
IPV6_ADDR_GEN_MODE="stable-privacy" 
NAME="ens33" 
UUID="Your respective network UUID" 
DEVICE="ens33" 
ONBOOT="yes"

Run the command systemctl restart network to restart the network

------------------------------------------------------------

**Edit /etc/hosts file**

Run the below commands on the machines. Change the IP address and host name as per your machine settings. 
cat << EOF >> /etc/hosts

192.168.0.xxx k8smaster 
192.168.0.xxx k8sworker1 
192.168.0.xxx k8sworker2

EOF
 
-----------------------------------------------------------
 
**Disable SELinux**
 
setenforce 0 
sed -i --follow-symlinks 's/SELINUX=enforcing/SELINUX=disabled/g' /etc/sysconfig/selinux

-----------------------------------------------------------
 
**Disable firewall and edit Iptables settings**
 
systemctl disable firewalld 
modprobe br_netfilter 
echo '1' > /proc/sys/net/bridge/bridge-nf-call-iptables 
 
----------------------------------------------------------
 
**Setup Kubernetes Repo**

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

---------------------------------------------------------
 
**Installing Kubeadm and Docker, Enable and start the services**
 
yum install kubeadm docker -y 
systemctl enable kubelet 
systemctl start kubelet 
systemctl enable docker 
systemctl start docker 
 
--------------------------------------------------------
 
**Disable Swap**
 
swapoff -a 
vi /etc/fstab and Comment the line with Swap Keyword 
 
-----------------------------------------------------
 
**Initialize Kubernetes Cluster**

kubeadm init 
mkdir -p $HOME/.kube 
cp -i /etc/kubernetes/admin.conf $HOME/.kube/config 
chown $(id -u):$(id -g) $HOME/.kube/config 
 
------------------------------------------------------
 
**Installing Pod Network using Calico network**

curl https://docs.projectcalico.org/manifests/calico.yaml -O 
kubectl apply -f calico.yaml 
kubectl get pods -n kube-system

----------------------------------------------------

**Join Worker Nodes **
 
 Use the token from Kubeadmin init screen. Below is a sample how it looks like. 
 
 kubeadm join 192.168.0.xxx:6443 --token XXX\
 --discovery-token-ca-cert-hash sha256:XX

---------------------------------------------------

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