Kubernetes 101: Creating a single master cluster with kubeadm

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Install Kubernetes on single node using kubeadm

Set Host name:
[root@crio ~]# cat /etc/hosts
192.168.17.17   crio  crio.cloud.local

Disable SELinux:
[root@crio ~]# setenforce 0
[root@crio ~]# sed -i --follow-symlinks 's/^SELINUX=enforcing/SELINUX=disabled/' /etc/sysconfig/selinux
Disable Firewall:
[root@crio ~]# systemctl disable firewalld && systemctl stop firewalld
Disable swap:
[root@crio ~]# sed -i '/swap/d' /etc/fstab && swapoff -a
Update sysctl settings for Kubernetes networking:

[root@crio ~]# cat >>/etc/sysctl.d/kubernetes.conf<<EOF
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
EOF
[root@crio ~]# sysctl --system
Add yum repository:
[root@crio ~]# cat >>/etc/yum.repos.d/kubernetes.repo<<EOF
[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

Install Kubernetes:
[root@crio ~]# yum install -y kubeadm kubelet kubectl docker
Enable and Start kubelet & docker service:
[root@crio ~]# for x in docker kubelet
do
systemctl start $x; systemctl enable $x
done

Initialize Kubernetes Cluster:

[root@crio ~]# kubeadm init --apiserver-advertise-address=192.168.17.17 --pod-network-cidr=10.244.0.0/16
[root@crio ~]# mkdir -p $HOME/.kube
[root@crio ~]#  cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
[root@crio ~]# chown $(id -u):$(id -g) $HOME/.kube/config

Deploy flannel network:
[root@crio ~]# kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml
[root@crio ~]# kubectl get pod --all-namespaces
[root@crio ~]# kubectl get pod --all-namespaces
NAMESPACE     NAME                                       READY   STATUS    RESTARTS   AGE
kube-system   coredns-86c58d9df4-mvx5c                   1/1     Running   0          108m
kube-system   coredns-86c58d9df4-vvg6k                   1/1     Running   0          108m
kube-system   etcd-crio.cloud.local                      1/1     Running   0          107m
kube-system   kube-apiserver-crio.cloud.local            1/1     Running   0          107m
kube-system   kube-controller-manager-crio.cloud.local   1/1     Running   1          107m
kube-system   kube-flannel-ds-amd64-gz2n4                1/1     Running   0          106m
kube-system   kube-proxy-4t6hx                           1/1     Running   0          108m
kube-system   kube-scheduler-crio.cloud.local            1/1     Running   1          107m
[root@crio ~]# kubectl get nodes
NAME               STATUS   ROLES    AGE    VERSION
crio.cloud.local   Ready    master   111m   v1.13.4



Good Luck https://www.linkedin.com/in/ahmedms/

































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