Kubernetes : Control Plane ノードの設定2023/11/16 |
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Kubeadm をインストールして、マルチノード Kubernetes クラスターを構成します。
当例では以下のように 3 台のノードを使用して設定します。
-----------+---------------------------+--------------------------+------------
| | |
eth0|10.0.0.30 eth0|10.0.0.51 eth0|10.0.0.52
+----------+-----------+ +-----------+----------+ +-----------+----------+
| [ dlp.srv.world ] | | [ node01.srv.world ] | | [ node02.srv.world ] |
| Control Plane | | Worker Node | | Worker Node |
+----------------------+ +----------------------+ +----------------------+
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| [1] |
| [2] |
Control Plane ノードで初期セットアップします。
[control-plane-endpoint] には Etcd や Kubernetes API サーバー等のコンポーネントが実行されるホストの IP アドレスを指定します。
[--pod-network-cidr] には、Pod Network が利用するネットワークを指定します。
Pod Network を構成するためのプラグインはいくつかのソフトウェアから選択可能です。(詳細は下記リンク参照)
⇒ https://kubernetes.io/docs/concepts/cluster-administration/networking/
当例では Calico で進めます。
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[root@dlp ~]# kubeadm init --control-plane-endpoint=10.0.0.30 --pod-network-cidr=192.168.0.0/16 --cri-socket=unix:///var/run/crio/crio.sock [init] Using Kubernetes version: v1.27.8 [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' [certs] Using certificateDir folder "/etc/kubernetes/pki" [certs] Generating "ca" certificate and key [certs] Generating "apiserver" certificate and key [certs] apiserver serving cert is signed for DNS names [dlp.srv.world kubernetes kubernetes.default kubernetes.default.svc kubernetes.default.svc.cluster.local] and IPs [10.96.0.1 10.0.0.30] [certs] Generating "apiserver-kubelet-client" certificate and key ..... ..... 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 Alternatively, if you are the root user, you can run: export KUBECONFIG=/etc/kubernetes/admin.conf You should now deploy a pod network to the cluster. Run "kubectl apply -f [podnetwork].yaml" with one of the options listed at: https://kubernetes.io/docs/concepts/cluster-administration/addons/ You can now join any number of control-plane nodes by copying certificate authorities and service account keys on each node and then running the following as root: kubeadm join 10.0.0.30:6443 --token kp5yik.noqvh58p8d0vtmnw \ --discovery-token-ca-cert-hash sha256:9fb2f2d15822a8f48b03fd9b3a6cbfe82741bde274b4450b53e5b2435bfc47a3 \ --control-plane Then you can join any number of worker nodes by running the following on each as root: kubeadm join 10.0.0.30:6443 --token kp5yik.noqvh58p8d0vtmnw \ --discovery-token-ca-cert-hash sha256:9fb2f2d15822a8f48b03fd9b3a6cbfe82741bde274b4450b53e5b2435bfc47a3 # クラスター管理ユーザーの設定 # 一般ユーザーを管理ユーザーとする場合は、該当ユーザー自身で sudo cp/chown *** [root@dlp ~]# mkdir -p $HOME/.kube [root@dlp ~]# cp -i /etc/kubernetes/admin.conf $HOME/.kube/config [root@dlp ~]# chown $(id -u):$(id -g) $HOME/.kube/config
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| [3] | Calico での Pod Network を構成します。 |
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[root@dlp ~]# wget https://raw.githubusercontent.com/projectcalico/calico/master/manifests/calico.yaml [root@dlp ~]# kubectl apply -f calico.yaml poddisruptionbudget.policy/calico-kube-controllers created serviceaccount/calico-kube-controllers created serviceaccount/calico-node created serviceaccount/calico-cni-plugin created configmap/calico-config created customresourcedefinition.apiextensions.k8s.io/bgpconfigurations.crd.projectcalico.org created customresourcedefinition.apiextensions.k8s.io/bgpfilters.crd.projectcalico.org created customresourcedefinition.apiextensions.k8s.io/bgppeers.crd.projectcalico.org created customresourcedefinition.apiextensions.k8s.io/blockaffinities.crd.projectcalico.org created customresourcedefinition.apiextensions.k8s.io/caliconodestatuses.crd.projectcalico.org created customresourcedefinition.apiextensions.k8s.io/clusterinformations.crd.projectcalico.org created customresourcedefinition.apiextensions.k8s.io/felixconfigurations.crd.projectcalico.org created customresourcedefinition.apiextensions.k8s.io/globalnetworkpolicies.crd.projectcalico.org created customresourcedefinition.apiextensions.k8s.io/globalnetworksets.crd.projectcalico.org created customresourcedefinition.apiextensions.k8s.io/hostendpoints.crd.projectcalico.org created customresourcedefinition.apiextensions.k8s.io/ipamblocks.crd.projectcalico.org created customresourcedefinition.apiextensions.k8s.io/ipamconfigs.crd.projectcalico.org created customresourcedefinition.apiextensions.k8s.io/ipamhandles.crd.projectcalico.org created customresourcedefinition.apiextensions.k8s.io/ippools.crd.projectcalico.org created customresourcedefinition.apiextensions.k8s.io/ipreservations.crd.projectcalico.org created customresourcedefinition.apiextensions.k8s.io/kubecontrollersconfigurations.crd.projectcalico.org created customresourcedefinition.apiextensions.k8s.io/networkpolicies.crd.projectcalico.org created customresourcedefinition.apiextensions.k8s.io/networksets.crd.projectcalico.org created clusterrole.rbac.authorization.k8s.io/calico-kube-controllers created clusterrole.rbac.authorization.k8s.io/calico-node created clusterrole.rbac.authorization.k8s.io/calico-cni-plugin created clusterrolebinding.rbac.authorization.k8s.io/calico-kube-controllers created clusterrolebinding.rbac.authorization.k8s.io/calico-node created clusterrolebinding.rbac.authorization.k8s.io/calico-cni-plugin created daemonset.apps/calico-node created deployment.apps/calico-kube-controllers created # 確認 : STATUS = Ready であれば OK [root@dlp ~]# kubectl get nodes NAME STATUS ROLES AGE VERSION dlp.srv.world Ready control-plane 3m12s v1.27.7 # 確認 : 全て Running であれば OK [root@dlp ~]# kubectl get pods -A NAMESPACE NAME READY STATUS RESTARTS AGE kube-system calico-kube-controllers-8787c9999-7q7rp 1/1 Running 0 37s kube-system calico-node-p4wfn 0/1 Running 0 37s kube-system coredns-5d78c9869d-278jf 1/1 Running 0 3m11s kube-system coredns-5d78c9869d-kbrlh 1/1 Running 0 3m11s kube-system etcd-dlp.srv.world 1/1 Running 0 3m26s kube-system kube-apiserver-dlp.srv.world 1/1 Running 0 3m25s kube-system kube-controller-manager-dlp.srv.world 1/1 Running 0 3m24s kube-system kube-proxy-qr2c2 1/1 Running 0 3m12s kube-system kube-scheduler-dlp.srv.world 1/1 Running 0 3m23s |
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