The kubernetes's intro from bapushinde

Setup Multinode Kubernetes cluster quickly on Ubuntu VMs

P.S.: I have setup 3 Nodes Kubernetes Cluster on GCP

Prerequisite:

a. 3 VMs having specification of (2 vCPUs, 2 GB memory, 10GB storage)

b. Open ports 22, 80, 443, 6443 within VPC/Compute Network

Simplified steps to setup cluster (1 Master & 2 Worker Nodes).

(P.S. These step are Not limited to 2 worker nodes only, If you have N number of worker nodes, just repeat worker nodes specific steps on each worker node)

Setup Docker Runtime on each VM

SSH into all 3 VMs & switch to root user using sudo -i
Open URL -> Container Runtime in browser (or another tab window)
Select Ubuntu 16.04+ Tab to executes commands on all 3 VMs to setup Docker runtime.

Tip: Last command executed through this link should be
```
  sudo systemctl enable docker
```
Run docker ps on each VM and you should see output

root@terraform-k8s-worker-1:~# docker ps 
CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS                    NAMES
root@terraform-k8s-worker-1:~#

Execute below Prerequisite on all 3 VMs (Don't miss this step during docker runtime Setup):

    sudo modprobe overlay
    sudo modprobe br_netfilter
    
    # Set up required sysctl params, these persist across reboots.
    
    cat <<EOF | sudo tee /etc/sysctl.d/99-kubernetes-cri.conf
    net.bridge.bridge-nf-call-iptables  = 1
    net.ipv4.ip_forward                 = 1
    net.bridge.bridge-nf-call-ip6tables = 1
    EOF
    
    sudo sysctl --system

Install Kubernetes Orachestration tool "kubeadm" on all Nodes.

Open kubernetes documentation link -> Kubernetes Documentation and search install kubeadm in search box on left hand side

Open link from Search Result -> Installing kubeadm | Kubernetes

On this page Jump on to section Installing kubeadm, kubelet and kubectl

Select Tab Ubuntu, Debian Or HypriotOS and execute following set of commands from this section on all 3 VMs:

sudo apt-get update && sudo apt-get install -y apt-transport-https curl

curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | sudo apt-key add -

cat <<EOF | sudo tee /etc/apt/sources.list.d/kubernetes.list
deb https://apt.kubernetes.io/ kubernetes-xenial main
EOF

sudo apt-get update

sudo apt-get install -y kubelet kubeadm kubectl

sudo apt-mark hold kubelet kubeadm kubectl

Restarting the kubelet is required:

systemctl daemon-reload
systemctl restart kubelet

Setup Master Node in the Cluster

Important!: To setup master node in the cluster please Switch to Master Node VM terminal

Search for Creating a cluster with kubeadm to run kubeadm init on Master node VM , Open link from search result --> Creating a cluster with kubeadm | Kubernetes

On this page Jump on to section More information

Execute kubeadm initilisation command

kubeadm init

# You will see output in console like.. 

[init] Using Kubernetes version: vX.Y.Z
[preflight] Running pre-flight checks
[preflight] Pulling images required for setting up a Kubernetes cluster
[preflight] This might take a minute or two, depending on the speed of your internet connection
[preflight] You can also perform this action in beforehand using 'kubeadm config images pull'
[kubelet-start] Writing kubelet environment file with flags to file "/var/lib/kubelet/kubeadm-flags.env"
[kubelet-start] Writing kubelet configuration to file "/var/lib/kubelet/config.yaml"
[kubelet-start] Activating the kubelet service
[certs] Using certificateDir folder "/etc/kubernetes/pki"
[certs] Generating "etcd/ca" certificate and key
.
.
.
.

[bootstraptoken] creating the "cluster-info" ConfigMap in the "kube-public" namespace
[addons] Applied essential addon: CoreDNS
[addons] Applied essential addon: kube-proxy

Your Kubernetes control-plane has initialized successfully!

To start using your cluster, you need to run the following as a regular user:

  mkdir -p $HOME/.kube
  sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
  sudo chown $(id -u):$(id -g) $HOME/.kube/config

You should now deploy a Pod network to the cluster.
Run "kubectl apply -f [podnetwork].yaml" with one of the options listed at:
  /docs/concepts/cluster-administration/addons/

You can now join any number of machines by running the following on each node
as root:

  kubeadm join <control-plane-host>:<control-plane-port> --token <token> --discovery-token-ca-cert-hash sha256:<hash>

Copy the following kubeadm init command output, into handy text editor like notepad/notepad++/sublimetext etc

To start using your cluster, you need to run the following as a regular user:

  mkdir -p $HOME/.kube
  sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
  sudo chown $(id -u):$(id -g) $HOME/.kube/config

You should now deploy a Pod network to the cluster.
Run "kubectl apply -f [podnetwork].yaml" with one of the options listed at:
  /docs/concepts/cluster-administration/addons/

You can now join any number of machines by running the following on each node
as root:

kubeadm join <control-plane-host>:<control-plane-port> --token <token> --discovery-token-ca-cert-hash sha256:<hash>

To make kubectl work for your non-root user from Master Node, run these commands
1. Exit from root-user for example

root@terraform-k8s-master-0:~# exit
logout
bapus_pro_2020@terraform-k8s-master-0:~$

Run as a normal user:

  mkdir -p $HOME/.kube
  sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
  sudo chown $(id -u):$(id -g) $HOME/.kube/config

Now run kubectl get nodes command, there should be only one node (i.e. Master node in Not Ready Status)

bapus_pro_2020@terraform-k8s-master-0:~$ kubectl get nodes
NAME                         STATUS   ROLES    AGE   VERSION
terraform-k8s-master-0   Not Ready    master   40s   v1.19.2
bapus_pro_2020@terraform-k8s-master-0:~$

Now to apply Network policy to establish network communication within cluster between master node & worker node. And get Master node in ready state. Here we will setup Calico network policy

Open Calico Network Policy to setup on Master node

Tip: To open calico network policy documentation through Google search, In Google search type "calico.yaml kubernetes" and open first link "Install Calico networking and network policy for on-premises ..." & Jump to Section Install Calico with Kubernetes API datastore, 50 nodes or less

Now Run kubectl apply -f <filename_or_url> command on Master node

curl https://docs.projectcalico.org/manifests/calico.yaml -O
kubectl apply -f calico.yaml

kubectl apply -f https://docs.projectcalico.org/manifests/calico.yaml

Check Network policy apply run result. Execute kubectl get nodes -w & wait for command to output ready status

kubectl get nodes -w
NAME                         STATUS   ROLES    AGE   VERSION
terraform-k8s-master-0   Not Ready    master   2m9s   v1.19.2
terraform-k8s-master-0   Not Ready    master   2m10s   v1.19.2
terraform-k8s-master-0   Not Ready    master   2m11s   v1.19.2
terraform-k8s-master-0   Ready        master   2m12s   v1.19.2
terraform-k8s-master-0   Ready        master   2m13s   v1.19.2
terraform-k8s-master-0   Ready        master   2m14s   v1.19.2
.
.
#Now hit Control+c

Now run kubectl get nodes command,

bapus_pro_2020@terraform-k8s-master-0:~$ kubectl get nodes
NAME                         STATUS   ROLES    AGE   VERSION
terraform-k8s-master-0   Ready    master   2m40s   v1.19.2
bapus_pro_2020@terraform-k8s-master-0:~$

Now Join each worker Nodes to Master node in the cluster by running `kubeadm join` command from Worker node VM

Important!: To join worker node in the cluster, Please Switch to Worker Node's VM terminal (Repeat this step for each worker node)

Copy kubeadm join xxxxxx command from text editor previously copied as kubeadm init command output & run on each Worker Node i.e.

kubeadm join <control-plane-host>:<control-plane-port> --token <token> --discovery-token-ca-cert-hash sha256:<hash>

Example:

root@terraform-k8s-worker-1:~# kubeadm join 10.142.0.4:6443 --token fia5f8.2x5ud7uhwgxlcfb2 \
> --discovery-token-ca-cert-hash sha256:42b95610799f923b5ffbc770dd5951a7870aa53efb1ba28938bec69e208e30fd 
[preflight] Running pre-flight checks

[preflight] Reading configuration from the cluster...
[preflight] FYI: You can look at this config file with 'kubectl -n kube-system get cm kubeadm-config -oyaml'
[kubelet-start] Writing kubelet configuration to file "/var/lib/kubelet/config.yaml"
[kubelet-start] Writing kubelet environment file with flags to file "/var/lib/kubelet/kubeadm-flags.env"
[kubelet-start] Starting the kubelet
[kubelet-start] Waiting for the kubelet to perform the TLS Bootstrap...

This node has joined the cluster:
* Certificate signing request was sent to apiserver and a response was received.
* The Kubelet was informed of the new secure connection details.

Run 'kubectl get nodes' on the control-plane to see this node join the cluster.

root@terraform-k8s-worker-1:~#

Repeat this step for each Worker Node

Now Switch to Master Node VM terminal and run kubectl get nodes command

bapus_pro_2020@terraform-k8s-master-0:~$ kubectl get nodes
NAME                         STATUS   ROLES    AGE   VERSION
terraform-k8s-master-0   Ready    master   3m5s   v1.19.2
terraform-k8s-worker-0   Ready    <none>   3s   v1.19.2
terraform-k8s-worker-1   Ready    <none>   4s   v1.19.2
bapus_pro_2020@terraform-k8s-master-0:~$

Congratulations, Here you've Successfully setup Kubernetes Cluster (1 Master Node and 2 Worker Nodes)!!

P.S.: To Setup Kubernetes Metrics API server refer documentation Metrics-API-Server

bapushinde / kubernetes Goto Github PK

kubernetes's Introduction

Setup Multinode Kubernetes cluster quickly on Ubuntu VMs

Prerequisite:

Simplified steps to setup cluster (1 Master & 2 Worker Nodes).

Setup Docker Runtime on each VM

Install Kubernetes Orachestration tool "kubeadm" on all Nodes.

Setup Master Node in the Cluster

Now Join each worker Nodes to Master node in the cluster by running `kubeadm join` command from Worker node VM

Congratulations, Here you've Successfully setup Kubernetes Cluster (1 Master Node and 2 Worker Nodes)!!

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bapushinde / kubernetes Goto Github PK

kubernetes's Introduction

Setup Multinode Kubernetes cluster quickly on Ubuntu VMs

Prerequisite:

Simplified steps to setup cluster (1 Master & 2 Worker Nodes).

Setup Docker Runtime on each VM

Install Kubernetes Orachestration tool "kubeadm" on all Nodes.

Setup Master Node in the Cluster

Now Join each worker Nodes to Master node in the cluster by running kubeadm join command from Worker node VM

Congratulations, Here you've Successfully setup Kubernetes Cluster (1 Master Node and 2 Worker Nodes)!!

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Now Join each worker Nodes to Master node in the cluster by running `kubeadm join` command from Worker node VM