Setup Kubernetes Cluster di Ubuntu 20.04 dengan CRI-O Engine
Halo semua, dalam kesempatan kali ini saya akan berbagi cara setup Kubernetes v1.19 dengan menggunakan kubeadm di Ubuntu 20.04 (Focal) dengan menggunakan container engine CRI-O.
Topologi
Berikut topologi yang digunakan:
| Nama VM | NIC | Spesifikasi |
|---|---|---|
| k8s-master | ens3: 10.10.10.51/24 | vCPU: 4 RAM: 8G Storage: 80G |
| k8s-worker01 | ens3: 10.10.10.52/24 | vCPU: 4 RAM: 8G Storage: 80G |
| k8s-worker02 | ens3: 10.10.10.53/24 | vCPU: 4 RAM: 8G Storage: 80G |
Catatan
Tutorial ini dibuat dan diuji coba menggunakan KVM Guest atau Virtual Machine.
1. Setup Host
Lakukan disemua host
1.1. Masukkan setiap host ke dalam /etc/hosts
sudo vim /etc/hosts
- /etc/hosts
127.0.0.1 localhost
10.10.10.51 k8s-master
10.10.10.52 k8s-worker01
10.10.10.53 k8s-worker02
1.2. Memperbarui paket-paket pada host
sudo apt update
sudo apt upgrade
2. Setup CRI-O
Jalankan command di bawah pada semua host
2.1. Lakukan konfigurasi prasyarat
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
2.2. Pasang repository CRI-O
export OS=xUbuntu_20.04 # OS Version
export VERSION=1.19 # Cri-O Version
cat <<EOF | sudo tee /etc/apt/sources.list.d/devel:kubic:libcontainers:stable.list
deb https://download.opensuse.org/repositories/devel:/kubic:/libcontainers:/stable/$OS/ /
EOF
cat <<EOF | sudo tee /etc/apt/sources.list.d/devel:kubic:libcontainers:stable:cri-o:$VERSION.list
deb http://download.opensuse.org/repositories/devel:/kubic:/libcontainers:/stable:/cri-o:/$VERSION/$OS/ /
EOF
curl -L https://download.opensuse.org/repositories/devel:/kubic:/libcontainers:/stable/$OS/Release.key | sudo apt-key --keyring /etc/apt/trusted.gpg.d/libcontainers.gpg add -
curl -L https://download.opensuse.org/repositories/devel:kubic:libcontainers:stable:cri-o:$VERSION/$OS/Release.key | sudo apt-key --keyring /etc/apt/trusted.gpg.d/libcontainers-cri-o.gpg add -
2.3. Instal CRI-O
sudo apt-get update
sudo apt-get install cri-o cri-o-runc
2.4. Jalankan servis CRI-O
sudo systemctl enable --now crio
3. Setup Kubernetes
Jalankan command di bawah pada semua host
3.1. Pasang repository Kubernetes
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
3.2. install paket-paket Kubernetes
sudo apt-get update
sudo apt-get install -y kubelet=1.19.4-00 kubeadm=1.19.4-00 kubectl=1.19.4-00
sudo apt-mark hold kubelet kubeadm kubectl
Jalankan command di bawah pada master
3.3. Membuat file konfigurasi control plane Kubernetes
vim init.yaml
- init.yaml
apiVersion: kubeadm.k8s.io/v1beta2
kind: InitConfiguration
localAPIEndpoint:
advertiseAddress: 10.10.10.51 # Sesuaikan dengan IP Addr host
bindPort: 6443
nodeRegistration:
criSocket: /var/run/crio/crio.sock
name: k8s-master # Sesuaikan dengan hostname host
taints:
- effect: NoSchedule
key: node-role.kubernetes.io/master
---
apiServer:
timeoutForControlPlane: 4m0s
apiVersion: kubeadm.k8s.io/v1beta2
certificatesDir: /etc/kubernetes/pki
clusterName: kubernetes
controllerManager: {}
dns:
type: CoreDNS
etcd:
local:
dataDir: /var/lib/etcd
controlPlaneEndpoint: k8s-master:6443 # Sesuaikan dengan hostname host
kind: ClusterConfiguration
kubernetesVersion: v1.19.4
networking:
dnsDomain: cluster.local
podSubnet: 10.244.0.0/16 # Menggunakan Subnet 10.244.0.0/16 untuk flannel
serviceSubnet: 10.96.0.0/12
scheduler: {}
---
apiVersion: kubelet.config.k8s.io/v1beta1
kind: KubeletConfiguration
cgroupDriver: systemd
3.4. Inisiasi cluster menggunakan kubeadm
sudo kubeadm init --config init.yaml
3.5. (Opsional) Dapatkan command untuk join cluster
Catat output dari command di bawah
sudo kubeadm token create --print-join-command
3.6. Salin file kubeconfig agar user bisa mengakses cluster Kubernetes
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config
Jalankan command di bawah ini disemua worker
3.7. Worker bergabung ke cluster
Command di bawah hanyalah contoh
sudo kubeadm join k8s-master:6443 --token 12v372.zgar4m9gtvcy82t4 \
--discovery-token-ca-cert-hash sha256:8c4bf4cfda563e260751c6860ec67613a39a2b5df24dbda8b2b1d1256b12d201
Jalankan command di bawah pada master
3.8. Verifikasi worker sudah masuk kedalam cluster Kubernetes
kubectl get nodes
Contoh output
student@k8s-master:~$ kubectl get nodes
NAME STATUS ROLES AGE VERSION
k8s-master Ready master 18h v1.19.4
k8s-worker01 Ready <none> 18h v1.19.4
k8s-worker02 Ready <none> 18h v1.19.4
4. Memasang Container Network Interface (CNI)
Pada tutorial kali ini CNI yang digunakan adalah flannel
4.1. Pasang flannel dengan menggunakan manifest
Manifest bisa didapatkan di sini
kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml
4.2. Verifikasi pods flannel sudah berjalan
kubectl -n kube-system get pods --selector app=flannel -o wide
Contoh output
student@k8s-master:~$ kubectl -n kube-system get pods --selector app=flannel -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
kube-flannel-ds-kdx92 1/1 Running 0 2m41s 10.10.10.52 k8s-worker01 <none> <none>
kube-flannel-ds-nm6ws 1/1 Running 0 2m41s 10.10.10.53 k8s-worker02 <none> <none>
kube-flannel-ds-qvpwb 1/1 Running 0 2m41s 10.10.10.51 k8s-master <none> <none>
Referensi
Instal Container Runtime - CRI-O
deploy Kubernetes
kubeadm token
Flannel
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