ijrios / K3s_kubernetes

Instrue kubernetes botrum cum k3s.

Setup a k3s cluster

This guide is to setup a Kubernetes cluster based on k3s.

1. Prepare servers
2. Install k3s cluster
3. Install client to access the cluster

Prepare servers

For windows, follow the instructions in "windows"

Install k3s cluster

1. Access master node with ip: 192.168.1.61

   • Option 1: Access directly using virtualbox.

   Login: packer
   Password: packer

   • Option 2: using ssh

   ssh 192.168.1.61 -l packer

2. Install k3s on master

   ###### on master node
   ###############################
   curl -sfL https://get.k3s.io | K3S_TOKEN=mynodetoken sh -s - --no-deploy traefik
   
   # prepare config file distribution
   sudo cp --no-preserve=mode /etc/rancher/k3s/k3s.yaml k3s.yaml

3. Access worker node with ip: 192.168.1.62

   ssh 192.168.1.62 -l packer

4. Install k3s on worker node

   ###### on worker node
   ###############################
   curl -sfL https://get.k3s.io | K3S_URL=https://192.168.1.61:6443 K3S_TOKEN=mynodetoken sh -

5. Repeat step 3 and 4 for ip 192.168.1.63

6. Verifing by going back to master node and run command

   sudo kubectl get node
   
   # successful output
   packer@kubemaster:~$ sudo kubectl get node
    NAME         STATUS   ROLES                  AGE   VERSION
    kubenode2    Ready    <none>                 34h   v1.20.7+k3s1
    kubemaster   Ready    control-plane,master   34h   v1.20.7+k3s1
    kubenode1    Ready    <none>                 34h   v1.20.7+k3s1

Install client to access the cluster

1. Download k3s configuration file

   USER=packer
   MASTER_IP=192.168.1.61
   
   scp $USER@$MASTER_IP:/home/$USER/k3s.yaml k3s.yaml
   # supply a password

2. Copy config to kubectl default folder

    sed -i "" "s/127.0.0.1/$MASTER_IP/g" k3s.yaml
    mkdir -p ~/.kube
    touch ~/.kube/config
    cp ~/.kube/config ~/.kube/config.bak 
    KUBECONFIG=k3s.yaml:~/.kube/config kubectl config view --flatten > config 
    mv config ~/.kube/config
    rm ~/.kube/config.bak

3. Install kubectl

   # install kubectl (https://kubernetes.io/docs/tasks/tools/)
    curl -LO "https://dl.k8s.io/release/$(curl -L -s https://dl.k8s.io/release/stable.txt)/bin/darwin/amd64/kubectl"
    chmod +x ./kubectl
    sudo mv ./kubectl /usr/local/bin/kubectl
    sudo chown root: /usr/local/bin/kubectl
    kubectl version --client

4. Install helm

   # install helm3
    curl https://raw.githubusercontent.com/helm/helm/master/scripts/get-helm-3 | bash
    helm version