Kubernetes : Control Plane ノードの設定2023/07/28 |
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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|10.0.0.25 eth0|10.0.0.71 eth0|10.0.0.72
+----------+-----------+ +-----------+-----------+ +-----------+-----------+
| [ ctrl.srv.world ] | | [snode01.srv.world] | | [snode02.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@ctrl:~# kubeadm init --control-plane-endpoint=10.0.0.25 --pod-network-cidr=192.168.0.0/16 --cri-socket=unix:///run/containerd/containerd.sock
[init] Using Kubernetes version: v1.30.3
[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 [ctrl.srv.world kubernetes kubernetes.default kubernetes.default.svc kubernetes.default.svc.cluster.local] and IPs [10.96.0.1 10.0.0.25]
.....
.....
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 10.0.0.25:6443 --token wmgxmn.abjab1upv8da9bp5 \
--discovery-token-ca-cert-hash sha256:6b0bceac20f9f9e4dea0c52d8ba3b50d565d7e59ddbdeee6fd7544d140ac78fe \
--control-plane
Then you can join any number of worker nodes by running the following on each as root:
kubeadm join 10.0.0.25:6443 --token wmgxmn.abjab1upv8da9bp5 \
--discovery-token-ca-cert-hash sha256:6b0bceac20f9f9e4dea0c52d8ba3b50d565d7e59ddbdeee6fd7544d140ac78fe
# 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@ctrl:~# mkdir -p $HOME/.kube root@ctrl:~# cp -i /etc/kubernetes/admin.conf $HOME/.kube/config root@ctrl:~# 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@ctrl:~# wget https://raw.githubusercontent.com/projectcalico/calico/master/manifests/calico.yaml root@ctrl:~# 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@ctrl:~# kubectl get nodes NAME STATUS ROLES AGE VERSION ctrl.srv.world Ready control-plane 2m9s v1.30.3 # 確認 : 全て Running であれば OK root@ctrl:~# kubectl get pods -A NAMESPACE NAME READY STATUS RESTARTS AGE kube-system calico-kube-controllers-86996b59f4-8zjlx 1/1 Running 0 35s kube-system calico-node-9kklj 1/1 Running 0 35s kube-system coredns-7db6d8ff4d-jmdnv 1/1 Running 0 2m7s kube-system coredns-7db6d8ff4d-klrl7 1/1 Running 0 2m7s kube-system etcd-ctrl.srv.world 1/1 Running 0 2m21s kube-system kube-apiserver-ctrl.srv.world 1/1 Running 0 2m21s kube-system kube-controller-manager-ctrl.srv.world 1/1 Running 0 2m21s kube-system kube-proxy-gpkt2 1/1 Running 0 2m7s kube-system kube-scheduler-ctrl.srv.world 1/1 Running 0 2m21s |
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