Kubeadm安装Kubernetes集群
实验环境
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主机名 | IP地址 | 系统配置 | 备注 |
node171 | 172.20.20.171 | CentOS7.3 X64 2C/4G | Master |
node172 | 172.20.20.172 | CentOS7.3 X64 1C/1G | Node1 |
node173 | 172.20.20.173 | CentOS7.3 X64 1C/1G | Node2 |
基础环境配置
使用的都是root用户进行操作
3台均需操作
cat > /etc/hosts << EOF
172.20.20.171 node171
172.20.20.172 node172
172.20.20.173 node173
EOF
# swapoff /dev/mapper/cl-swap
# vi /etc/fstab
| #/dev/mapper/cl-swap swap swap defaults 0 0 |
# systemctl disable firewalld
# systemctl stop firewalld
# vi /etc/sysconfig/selinux
| SELINUX=disabled |
# setenforce 0
# cat > /etc/sysctl.d/k8s.conf < net.bridge.bridge-nf-call-ip6tables = 1 net.bridge.bridge-nf-call-iptables = 1 EOF # sysctl --system # cat >> /etc/sysctl.conf < net.ipv4.ip_forward = 1 EOF # sysctl -p # yum install -y wget # mkdir -p /etc/yum.repos.d/bak # cd /etc/yum.repos.d/ # mv * bak # wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.cloud.tencent.com/repo/centos7_base.repo # wget -O /etc/yum.repos.d/epel.repo http://mirrors.cloud.tencent.com/repo/epel-7.repo # yum clean all && yum makecache # cat > /etc/yum.repos.d/kubernetes.repo << EOF [kubernetes] name=Kubernetes baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64/ enabled=1 gpgcheck=1 repo_gpgcheck=1 gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpghttps://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg EOF # wget https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo -O /etc/yum.repos.d/docker-ce.repo # yum install -y docker-ce-18.06.1.ce-3.el7 # systemctl enable docker && systemctl start docker # yum install -y kubelet kubeadm kubectl # systemctl enable kubelet 在master上进行操作 # kubeadm init --kubernetes-version=1.14.2 --apiserver-advertise-address=172.20.20.171 --image-repository registry.aliyuncs.com/google_containers --service-cidr=172.100.0.0/16 --pod-network-cidr=10.244.0.0/16 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 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/ Then you can join any number of worker nodes by running the following on each as root: kubeadm join 172.20.20.171:6443 --token 7d6gy1.wcroc19bpsbpx7bp \ --discovery-token-ca-cert-hash sha256:654a19df7e29ccd08b993014852a678893aeaa5241362767c0c3d59743a16ec9 # mkdir -p $HOME/.kube # sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config # chown $(id -u):$(id -g) $HOME/.kube/config [root@node171 ~]# kubectl get nodes NAME STATUS ROLES AGE VERSION node171 NotReady master 2m26s v1.14.3 [root@node171 ~]# kubectl get cs NAME STATUS MESSAGE ERROR scheduler Healthy ok controller-manager Healthy ok etcd-0 Healthy {"health":"true"} 部署flannel网络 # wgethttps://raw.githubusercontent.com/coreos/flannel/a70459be0084506e4ec919aa1c114638878db11b/Documentation/kube-flannel.yml kubectl create -f ./kube-flannel.yml 在Node节点上操作 需要master节点上的pods状态都是Running时，才执行如下语句： # kubeadm join 172.20.20.171:6443 --token 7d6gy1.wcroc19bpsbpx7bp \ --discovery-token-ca-cert-hash sha256:654a19df7e29ccd08b993014852a678893aeaa5241362767c0c3d59743a16ec9 在Master查看集群状态 [root@node171 ~]# kubectl get nodes NAME STATUS ROLES AGE VERSION node171 Ready master 18m v1.14.3 node172 Ready node173 Ready 若出现Ready说明集群状态正常 验证Pod以验证集群是否正常 # kubectl create deployment nginx --image=nginx # kubectl expose deployment nginx --port=80 --type=NodePort [root@node171 ~]# kubectl get pod,svc NAME READY STATUS RESTARTS AGE pod/nginx-65f88748fd-7sthx 0/1 ContainerCreating 0 67s NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE service/kubernetes ClusterIP 169.169.0.1 service/nginx NodePort 169.169.231.102 部署Dashboard 在master上操作 # cat > kubernetes-dashboard.yaml << EOF # Copyright 2017 The Kubernetes Authors. # # Licensed under the Apache License, Version 2.0 (the "License"); # you may not use this file except in compliance with the License. # You may obtain a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. # ------------------- Dashboard Secret ------------------- # apiVersion: v1 kind: Secret metadata: labels: k8s-app: kubernetes-dashboard name: kubernetes-dashboard-certs namespace: kube-system type: Opaque --- # ------------------- Dashboard Service Account ------------------- # apiVersion: v1 kind: ServiceAccount metadata: labels: k8s-app: kubernetes-dashboard name: kubernetes-dashboard namespace: kube-system --- # ------------------- Dashboard Role & Role Binding ------------------- # kind: Role apiVersion: rbac.authorization.k8s.io/v1 metadata: name: kubernetes-dashboard-minimal namespace: kube-system rules: # Allow Dashboard to create 'kubernetes-dashboard-key-holder' secret. - apiGroups: [""] resources: ["secrets"] verbs: ["create"] # Allow Dashboard to create 'kubernetes-dashboard-settings' config map. - apiGroups: [""] resources: ["configmaps"] verbs: ["create"] # Allow Dashboard to get, update and delete Dashboard exclusive secrets. - apiGroups: [""] resources: ["secrets"] resourceNames: ["kubernetes-dashboard-key-holder", "kubernetes-dashboard-certs"] verbs: ["get", "update", "delete"] # Allow Dashboard to get and update 'kubernetes-dashboard-settings' config map. - apiGroups: [""] resources: ["configmaps"] resourceNames: ["kubernetes-dashboard-settings"] verbs: ["get", "update"] # Allow Dashboard to get metrics from heapster. - apiGroups: [""] resources: ["services"] resourceNames: ["heapster"] verbs: ["proxy"] - apiGroups: [""] resources: ["services/proxy"] resourceNames: ["heapster", "http:heapster:", "https:heapster:"] verbs: ["get"] --- apiVersion: rbac.authorization.k8s.io/v1beta1 kind: ClusterRoleBinding metadata: name: kubernetes-dashboard roleRef: kind: ClusterRole name: cluster-admin apiGroup: rbac.authorization.k8s.io subjects: - kind: ServiceAccount name: kubernetes-dashboard namespace: kube-system --- # ------------------- Dashboard Deployment ------------------- # kind: Deployment apiVersion: apps/v1 metadata: labels: k8s-app: kubernetes-dashboard name: kubernetes-dashboard namespace: kube-system spec: replicas: 1 revisionHistoryLimit: 10 selector: matchLabels: k8s-app: kubernetes-dashboard template: metadata: labels: k8s-app: kubernetes-dashboard spec: containers: - name: kubernetes-dashboard image: loveone/kubernetes-dashboard-amd64:v1.10.1 ports: - containerPort: 8443 protocol: TCP args: - --auto-generate-certificates # Uncomment the following line to manually specify Kubernetes API server Host # If not specified, Dashboard will attempt to auto discover the API server and connect # to it. Uncomment only if the default does not work. # - --apiserver-host=http://my-address:port volumeMounts: - name: kubernetes-dashboard-certs mountPath: /certs # Create on-disk volume to store exec logs - mountPath: /tmp name: tmp-volume livenessProbe: httpGet: scheme: HTTPS path: / port: 8443 initialDelaySeconds: 30 timeoutSeconds: 30 volumes: - name: kubernetes-dashboard-certs secret: secretName: kubernetes-dashboard-certs - name: tmp-volume emptyDir: {} serviceAccountName: kubernetes-dashboard # Comment the following tolerations if Dashboard must not be deployed on master tolerations: - key: node-role.kubernetes.io/master effect: NoSchedule --- # ------------------- Dashboard Service ------------------- # kind: Service apiVersion: v1 metadata: labels: k8s-app: kubernetes-dashboard name: kubernetes-dashboard namespace: kube-system spec: ports: - port: 443 targetPort: 8443 nodePort: 30001 type: NodePort selector: k8s-app: kubernetes-dashboard EOF # kubectl create -f kubernetes-dashboard.yaml [root@node171 ~]# kubectl get deployment kubernetes-dashboard -n kube-system NAME READY UP-TO-DATE AVAILABLE AGE kubernetes-dashboard 1/1 1 1 92s # kubectl get pods -n kube-system -o wide # kubectl get services -n kube-system 在浏览器中输入： https://172.20.20.171:30001 # kubectl -n kube-system describe secret $(kubectl -n kube-system get secret | grep kubernetes-dashboard-token|awk '{print $1}')|grep token:|awk '{print $2}' 使用得到的值，在下方粘贴过去 最后登录成功界面如下：
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