Kubernetes : Control Plane ノードの設定2022/11/02 |
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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: v1.25.3
[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]
[certs] Generating "apiserver-kubelet-client" certificate and key
[certs] Generating "front-proxy-ca" certificate and key
[certs] Generating "front-proxy-client" certificate and key
[certs] Generating "etcd/ca" certificate and key
[certs] Generating "etcd/server" certificate and key
[certs] etcd/server serving cert is signed for DNS names [ctrl.srv.world localhost] and IPs [10.0.0.25 127.0.0.1 ::1]
[certs] Generating "etcd/peer" certificate and key
[certs] etcd/peer serving cert is signed for DNS names [ctrl.srv.world localhost] and IPs [10.0.0.25 127.0.0.1 ::1]
[certs] Generating "etcd/healthcheck-client" certificate and key
[certs] Generating "apiserver-etcd-client" certificate and key
[certs] Generating "sa" key and public key
[kubeconfig] Using kubeconfig folder "/etc/kubernetes"
[kubeconfig] Writing "admin.conf" kubeconfig file
[kubeconfig] Writing "kubelet.conf" kubeconfig file
[kubeconfig] Writing "controller-manager.conf" kubeconfig file
[kubeconfig] Writing "scheduler.conf" kubeconfig file
[kubelet-start] Writing kubelet environment file with flags to file "/var/lib/kubelet/kubeadm-flags.env"
[kubelet-start] Writing kubelet configuration to file "/var/lib/kubelet/config.yaml"
[kubelet-start] Starting the kubelet
[control-plane] Using manifest folder "/etc/kubernetes/manifests"
[control-plane] Creating static Pod manifest for "kube-apiserver"
[control-plane] Creating static Pod manifest for "kube-controller-manager"
[control-plane] Creating static Pod manifest for "kube-scheduler"
[etcd] Creating static Pod manifest for local etcd in "/etc/kubernetes/manifests"
[wait-control-plane] Waiting for the kubelet to boot up the control plane as static Pods from directory "/etc/kubernetes/manifests". This can take up to 4m0s
[apiclient] All control plane components are healthy after 14.502196 seconds
[upload-config] Storing the configuration used in ConfigMap "kubeadm-config" in the "kube-system" Namespace
[kubelet] Creating a ConfigMap "kubelet-config" in namespace kube-system with the configuration for the kubelets in the cluster
[upload-certs] Skipping phase. Please see --upload-certs
[mark-control-plane] Marking the node ctrl.srv.world as control-plane by adding the labels: [node-role.kubernetes.io/control-plane node.kubernetes.io/exclude-from-external-load-balancers]
[mark-control-plane] Marking the node ctrl.srv.world as control-plane by adding the taints [node-role.kubernetes.io/control-plane:NoSchedule]
[bootstrap-token] Using token: sx7691.vhnz9i9szyqecy6e
[bootstrap-token] Configuring bootstrap tokens, cluster-info ConfigMap, RBAC Roles
[bootstrap-token] Configured RBAC rules to allow Node Bootstrap tokens to get nodes
[bootstrap-token] Configured RBAC rules to allow Node Bootstrap tokens to post CSRs in order for nodes to get long term certificate credentials
[bootstrap-token] Configured RBAC rules to allow the csrapprover controller automatically approve CSRs from a Node Bootstrap Token
[bootstrap-token] Configured RBAC rules to allow certificate rotation for all node client certificates in the cluster
[bootstrap-token] Creating the "cluster-info" ConfigMap in the "kube-public" namespace
[kubelet-finalize] Updating "/etc/kubernetes/kubelet.conf" to point to a rotatable kubelet client certificate and key
[addons] Applied essential addon: CoreDNS
[addons] Applied essential addon: kube-proxy
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 sx7691.vhnz9i9szyqecy6e \
--discovery-token-ca-cert-hash sha256:6166ac8d73379081c2ca2b9625480b3f2cc992f571659e776b68d676e84cc3d9 \
--control-plane
Then you can join any number of worker nodes by running the following on each as root:
# 以下のコマンドは Worker ノードからのクラスター Join の際に実行するため控えておく
kubeadm join 10.0.0.25:6443 --token sx7691.vhnz9i9szyqecy6e \
--discovery-token-ca-cert-hash sha256:6166ac8d73379081c2ca2b9625480b3f2cc992f571659e776b68d676e84cc3d9
# 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 configmap/calico-config created customresourcedefinition.apiextensions.k8s.io/bgpconfigurations.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 clusterrolebinding.rbac.authorization.k8s.io/calico-kube-controllers created clusterrolebinding.rbac.authorization.k8s.io/calico-node 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 9m35s v1.25.3 # 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-59697b644f-fgfqp 1/1 Running 0 2m32s kube-system calico-node-z8vgs 1/1 Running 0 2m32s kube-system coredns-565d847f94-v8v2x 1/1 Running 0 10m kube-system coredns-565d847f94-zh4rd 1/1 Running 0 10m kube-system etcd-ctrl.srv.world 1/1 Running 0 11m kube-system kube-apiserver-ctrl.srv.world 1/1 Running 0 11m kube-system kube-controller-manager-ctrl.srv.world 1/1 Running 0 11m kube-system kube-proxy-lnvhj 1/1 Running 0 10m kube-system kube-scheduler-ctrl.srv.world 1/1 Running 0 11m |
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