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Kube-init.md

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Topology

                                   +---------+
                                   |  My PC  |
        +--------------------------+         +--------------------------+
        |                          +---------+                          |
        |                               |                               |
        |                               |                               |
        |                               |                               |
        |                               |                               |
        |                               |                               |
        |                               |                               |
        |                               |                               |
        v                               v                               v
+-----------------+            +-----------------+           +-----------------+
| Ubuntu nested 1 |            | Ubuntu nested 2 |           | Ubuntu nested 3 |
|   200.0.0.10    |            |   200.0.0.20    |           |   200.0.0.30    |
|    Master 1     |            |    Worker 1     |           |    Worker 2     |
|                 |            |                 |           |                 |
+-----------------+            +-----------------+           +-----------------+
        |                               |                               |
        |                               |                               |
        |                               |                               |
        |                               |                               |
        |                               |                               |
        +---------------------------------------------------------------+
                         Kube cluster network (200.0.0.0/24)

Setup Containerd

  • wget https://github.com/containerd/containerd/releases/download/v1.6.2/containerd-1.6.2-linux-amd64.tar.gz

  • sudo tar Czxvf /usr/local containerd-1.6.2-linux-amd64.tar.gz

  • wget https://raw.githubusercontent.com/containerd/containerd/main/containerd.service

  • sudo mv containerd.service /usr/lib/systemd/system/

  • sudo systemctl daemon-reload

  • sudo systemctl enable --now containerd

  • sudo systemctl status containerd

  • wget https://github.com/opencontainers/runc/releases/download/v1.1.1/runc.amd64

  • sudo install -m 755 runc.amd64 /usr/local/sbin/runc

  • sudo mkdir -p /etc/containerd/

  • containerd config default | sudo tee /etc/containerd/config.toml

  • sudo sed -i 's/SystemdCgroup \= false/SystemdCgroup \= true/g' /etc/containerd/config.toml

  • sudo systemctl restart containerd

  • cat <<EOF | sudo tee /etc/modules-load.d/containerd.conf \noverlay \nbr_netfilter \nEOF

  • sudo modprobe overlay

  • sudo modprobe br_netfilter

  • cat <<EOF | sudo tee /etc/sysctl.d/99-kubernetes-cri.conf net.bridge.bridge-nf-call-iptables = 1 \nnet.ipv4.ip_forward = 1 \nnet.bridge.bridge-nf-call-ip6tables = 1 \nEOF

  • nano /etc/containerd/config.toml #set SystemdCgroup to false

  • systemctl restart containerd kubelet

  • sudo sysctl --system

Setup Kube

  • sudo apt 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\ndeb https://apt.kubernetes.io/ kubernetes-xenial main\nEOF

  • sudo apt update

  • sudo apt-get install -y kubelet=1.20.15-00 kubeadm=1.20.15-00 kubectl=1.20.15-00

  • sudo apt-mark hold kubelet kubeadm kubectl

  • nano cluster.yaml

kind: ClusterConfiguration
apiVersion: kubeadm.k8s.io/v1beta2
kubernetesVersion: v1.20.15
controlPlaneEndpoint: "200.0.0.10:6443"
networking:
  podSubnet: "100.100.0.0/16"
---
kind: KubeletConfiguration
apiVersion: kubelet.config.k8s.io/v1beta1

  • kubeadm init --config cluster.yaml --cri-socket /var/run/containerd/containerd.sock

  • kubeadm join 200.0.0.10:6443 --token 7eq77f.14w92ywfymbdvgw5 --discovery-token-ca-cert-hash sha256:e7e11ad25b273e6aa8296cdb68ba32208feec9a396b611f614fa7a6c19bdc570 --cri-socket /var/run/containerd/containerd.sock

Setup Calico cni

  • wget https://docs.projectcalico.org/archive/v3.12/manifests/calico.yaml
  • nano calico.yaml
  • kubectl apply -f calico.yaml

Setup MetalLB

  • kubectl apply -f https://raw.githubusercontent.com/metallb/metallb/v0.13.7/config/manifests/metallb-native.yaml
  • nano metallb-system-config.yaml
apiVersion: metallb.io/v1beta1
kind: IPAddressPool
metadata:
  name: default
  namespace: metallb-system
spec:
  addresses:
  - 200.0.0.100-200.0.0.120
  autoAssign: true
---
apiVersion: metallb.io/v1beta1
kind: L2Advertisement
metadata:
  name: default
  namespace: metallb-system
spec:
  ipAddressPools:
  - default
  • kubectl apply -f metallb-system-config.yaml

Ingress

  • kubectl apply -f https://raw.githubusercontent.com/kubernetes/ingress-nginx/controller-v1.3.1/deploy/static/provider/cloud/deploy.yaml

Ref