How to install kubernetes [closed] - docker

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How to install Kubernetes and How to add worker-nodes to Kubernetes-Master

Answer 1

Let's consider 1 Kubernetes-Cluster and 2 Worker-Nodes
While launching AWS ec2 instances, make sure that you open all the
ports in the related security groups.
All EC2 instances need to be on the same VPC and in the same
availability zone.
For K8-Cluster minimum requirement is t2.large
For Worker-Nodes minimum requirement is t2.micro
Login to putty/terminal to connect to your EC2 instances.
Run the following Commands on both K8-Cluster and Worker-nodes
Be a root user. Install Docker and start Docker service. Also, enable
the docker service so that the docker service starts on the system
restarts.
sudo su
yum install docker -y
systemctl enable docker && systemctl start docker
Create proper yum repo files so that we can use yum commands to install the components of Kubernetes.
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=0
gpgkey=https://packages.cloud.google.com/yum/doc/yum-key.gpg https://packages.cloud.google.com/yum/doc/rpm-package-key.gpg
exclude=kube*
EOF
sysctl command is used to modify kernel parameters at runtime. Kubernetes needs to have access to the kernel’s IP6 table and so we need to do some more modifications. This includes disabling secure Linux.
cat <<EOF > /etc/sysctl.d/k8s.conf
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
EOF
sysctl --system
setenforce 0
Install kubelet, kubeadm and kubectl; start kubelet daemon
yum install -y kubelet kubeadm kubectl --disableexcludes=kubernetes
systemctl enable kubelet && systemctl start kubelet
vi /etc/docker/daemon.json
{
"exec-opts": ["native.cgroupdriver=systemd"]
}
restart docker and kubelet; reload daemon
sudo systemctl daemon-reload
sudo systemctl restart docker
sudo systemctl restart kubelet
Only on the Master Node:
On the master node initialize the cluster.
kubeadm init --ignore-preflight-errors all
To make kubeconfig file permanent , paste the export KUBECONFIG=/etc/kubernetes/admin.conf after export PATH in .bash_profile
ls -al
vi .bash_profile
export KUBECONFIG=/etc/kubernetes/admin.conf
On All Worker nodes :
Copy kubeadm join command from the output of kubeadm init on the master node.
<kubeadm join command copied from master node>
# kubeadm join 172.31.37.128:6443 --token sttk5b.vco0jw5bkkf1toa4 \
--discovery-token-ca-cert-hash sha256:d77b5f865c1e30b73ea4dd7ea458f79f56da94f9de9c8d7a26b226d94fd0c49e
On the Master Node :
Create weave-net.
kubectl apply -f "https://cloud.weave.works/k8s/net?k8s-version=$(kubectl version | base64 | tr -d '\n')"
kubectl get nodes
That's it :)

Answer 2

The easiest way to start Kubernetes on Amazon Linux AMI (or any other Linux AMI) is to use Microk8s (a lightweight distribution of Kubernetes).
The following steps will help you get started with Kubernetes on EC2 instance:
Install Microk8s on EC2 instance
sudo snap install microk8s --classic
Check the status while Kubernetes starts
microk8s status --wait-ready
Turn on the services you want
microk8s enable dashboard dns registry istio
Start using Kubernetes
microk8s kubectl get all --all-namespaces
Access the Kubernetes dashboard
microk8s dashboard-proxy
Start and stop Kubernetes to save battery
microk8s start and microk8s stop
This way you can install a local version of Kubernetes with Microk8s. You can also follow this tutorial for detailed instructions on the above steps.