Kubernetes adalah sistem orkestrasi container open-source untuk mengotomatisasi penerapan, penskalaan, dan pengelolaan aplikasi komputer.

Sebelum memulai, pastikan perangkat lunak Anda mutakhir

sudo apt apdate
sudo apt upgrade

Instal

Instal paket berikut di semua mesin Anda:

• kubeadm :perintah untuk mem-bootstrap cluster.
• kubelet :komponen yang berjalan di semua mesin di cluster Anda dan melakukan hal-hal seperti memulai POD dan container.
• kubectl :utilitas baris perintah untuk berbicara dengan cluster Anda.

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

Konfirmasi versi yang diinstal

kubectl version --client

kubeadm version

Keluaran:

[email protected]:~$ kubectl version --client
Client Version: version.Info{Major:"1", Minor:"22", GitVersion:"v1.22.0", GitCommit:"c2b5237ccd9c0f1d600d3072634ca66cefdf272f", GitTreeState:"clean", BuildDate:"2021-08-04T18:03:20Z", GoVersion:"go1.16.6", Compiler:"gc", Platform:"linux/amd64"}

[email protected]:~$ kubeadm version
kubeadm version: &version.Info{Major:"1", Minor:"22", GitVersion:"v1.22.0", GitCommit:"c2b5237ccd9c0f1d600d3072634ca66cefdf272f", GitTreeState:"clean", BuildDate:"2021-08-04T18:02:08Z", GoVersion:"go1.16.6", Compiler:"gc", Platform:"linux/amd64"}

Matikan pertukaran.

sudo sed -i '/ swap / s/^\(.*\)$/#\1/g' /etc/fstab
sudo swapoff -a

Konfigurasi sysctl.

sudo modprobe overlay
sudo modprobe br_netfilter

sudo tee /etc/sysctl.d/kubernetes.conf<<EOF
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
net.ipv4.ip_forward = 1
EOF

sudo sysctl --system

Instal waktu proses Containerd Container

sudo apt-get install -y containerd

Konfigurasikan containerd dan mulai layanan

sudo mkdir -p /etc/containerd
sudo containerd config default > /etc/containerd/config.toml

Aktifkan layanan untuk memulai saat boot dan memulai

sudo systemctl enable --now containerd

# check status
sudo systemctl status containerd

Layanan harus berjalan

containerd.service - containerd container runtime
     Loaded: loaded (/lib/systemd/system/containerd.service; enabled; vendor preset: enabled)
     Active: active (running) since Wed 2021-08-04 20:27:51 UTC; 7min ago
       Docs: https://containerd.io
   Main PID: 8159 (containerd)
      Tasks: 12
     Memory: 23.3M
     CGroup: /system.slice/containerd.service
             └─8159 /usr/bin/containerd

Aug 04 20:27:51 ub-kubeadm containerd[8159]: time="2021-08-04T20:27:51.784407330Z" level=info msg="loading plugin \"io.containerd.grpc>
Aug 04 20:27:51 ub-kubeadm containerd[8159]: time="2021-08-04T20:27:51.785605392Z" level=info msg=serving... address=/run/containerd/c>
Aug 04 20:27:51 ub-kubeadm containerd[8159]: time="2021-08-04T20:27:51.785639559Z" level=info msg=serving... address=/run/containerd/c>
Aug 04 20:27:51 ub-kubeadm containerd[8159]: time="2021-08-04T20:27:51.787585658Z" level=info msg="containerd successfully booted in 0>
Aug 04 20:27:51 ub-kubeadm containerd[8159]: time="2021-08-04T20:27:51.801146245Z" level=info msg="Start subscribing containerd event"
Aug 04 20:27:51 ub-kubeadm containerd[8159]: time="2021-08-04T20:27:51.804843058Z" level=info msg="Start recovering state"
Aug 04 20:27:51 ub-kubeadm containerd[8159]: time="2021-08-04T20:27:51.805094249Z" level=info msg="Start event monitor"
Aug 04 20:27:51 ub-kubeadm containerd[8159]: time="2021-08-04T20:27:51.805193238Z" level=info msg="Start snapshots syncer"
Aug 04 20:27:51 ub-kubeadm containerd[8159]: time="2021-08-04T20:27:51.805282655Z" level=info msg="Start cni network conf syncer"
Aug 04 20:27:51 ub-kubeadm containerd[8159]: time="2021-08-04T20:27:51.805369362Z" level=info msg="Start streaming server"

Inisialisasi node master

Aktifkan dan mulai layanan kubelet.

sudo systemctl enable --now kubelet

Tarik gambar kontainer yang diperlukan:

sudo kubeadm config images pull

Setel nama DNS titik akhir cluster atau tambahkan catatan ke /etc/hosts berkas.

192.168.20.7 k8s.citizix.local

Buat kluster:

sudo kubeadm init \
  --pod-network-cidr=192.168.0.0/16 \
  --control-plane-endpoint=k8s.citizix.local

Setelah selesai, k8s harus aktif dan berjalan. Dapatkan file admin kubeconfig dari jalur ini /etc/kubernetes/admin.conf

mkdir ~/.kube
sudo cp /etc/kubernetes/admin.conf ~/.kube/admin.conf
sudo chown ${USER}.${GROUP} ~/.kube/admin.conf
chmod 400 ~/.kube/admin.conf

Periksa status cluster:

kubectl cluster-info

Konfirmasi node master sudah siap:

kubectl get nodes -o wide

Node Master tambahan dapat ditambahkan menggunakan perintah di output instalasi:

kubeadm join k8s-cluster.computingforgeeks.com:6443 --token sr4l2l.2kvot0pfalh5o4ik \
    --discovery-token-ca-cert-hash sha256:c692fb047e15883b575bd6710779dc2c5af8073f7cab460abd181fd3ddb29a18 \
    --control-plane

Tambahkan node pekerja

Dengan bidang kontrol yang siap, Anda dapat menambahkan node pekerja ke kluster untuk menjalankan beban kerja terjadwal.

Jika alamat titik akhir tidak ada dalam DNS, tambahkan catatan ke /etc/hosts.

$ sudo vim /etc/hosts
192.168.20.7 k8s.citizix.local

Perintah join yang diberikan digunakan untuk menambahkan node pekerja ke cluster.

kubeadm join k8s-cluster.computingforgeeks.com:6443 \
  --token sr4l2l.2kvot0pfalh5o4ik \
  --discovery-token-ca-cert-hash sha256:c692fb047e15883b575bd6710779dc2c5af8073f7cab460abd181fd3ddb29a18

Jalankan perintah di bawah pada control-plane untuk melihat apakah node bergabung dengan cluster.

kubectl get nodes

Deploy aplikasi di cluster