基于TLS证书手动部署kubernetes集群(下)
| 一、master节点组件部署 |
承接上篇文章–基于TLS证书手动部署kubernetes集群(上)，我们已经部署好了etcd集群、flannel网络以及每个节点的docker，接下来部署master节点
1.软件包下载：
下载地址：https://github.com/kubernetes/kubernetes/blob/master/CHANGELOG-1.9.md
2.解压包、创建目录
# 解压下载包 tar zxvf kubernetes-server-linux-amd64.tar.gz #创建目录,ssl 之前已经创建ssl目录可不用创建 mkdir -p /opt/kubernetes/{bin,conf,ssl} #拷贝执行脚本 cp kube-controller-manager /opt/kubernetes/bin/ cp kube-apiserver /opt/kubernetes/bin/ cp kube-scheduler /opt/kubernetes/bin/ cp kubectl /opt/kubernetes/bin/ #添加执行权限 chmod a+x /opt/kubernetes/bin/*
3.为各个组件通讯创建TLS Bootstrapping Token
#进入到配置文件目录 cd /opt/kubernetes/conf/ #生成token export BOOTSTRAP_TOKEN=$(head -c 16 /dev/urandom | od -An -t x | tr -d ' ') #保存到文件中 cat > token.csv <<EOF ${BOOTSTRAP_TOKEN},kubelet-bootstrap,10001,"system:kubelet-bootstrap" EOF #查看token cat token.csv
4.配置各个master组件
kube-apiserver
#配置文件 cat > /opt/kubernetes/conf/kube-apiserver <<EOF KUBE_APISERVER_OPTS="--logtostderr=true \ --v=4 \ --etcd-servers=https://10.1.210.32:2379,https://10.1.210.33:2379,https://10.1.210.34:2379 \ --insecure-bind-address=127.0.0.1 \ --bind-address=10.1.210.33 \ --insecure-port=8080 \ --secure-port=6443 \ --advertise-address=10.1.210.33 \ --allow-privileged=true \ --service-cluster-ip-range=10.10.10.0/24 \ --admission-control=NamespaceLifecycle,LimitRanger,SecurityContextDeny,ServiceAccount,ResourceQuota,NodeRestriction --authorization-mode=RBAC,Node \ --kubelet-https=true \ --enable-bootstrap-token-auth \ --token-auth-file=/opt/kubernetes/conf/token.csv \ --service-node-port-range=30000-50000 \ --tls-cert-file=/opt/kubernetes/ssl/server.pem \ --tls-private-key-file=/opt/kubernetes/ssl/server-key.pem \ --client-ca-file=/opt/kubernetes/ssl/ca.pem \ --service-account-key-file=/opt/kubernetes/ssl/ca-key.pem \ --etcd-cafile=/opt/kubernetes/ssl/ca.pem \ --etcd-certfile=/opt/kubernetes/ssl/server.pem \ --etcd-keyfile=/opt/kubernetes/ssl/server-key.pem" EOF ##服务器启动文件 cat > /usr/lib/systemd/system/kube-apiserver.service <<EOF [Unit] Description=Kubernetes API Server Documentation=https://github.com/kubernetes/kubernetes [Service] EnvironmentFile=-/opt/kubernetes/conf/kube-apiserver ExecStart=/opt/kubernetes/bin/kube-apiserver $KUBE_APISERVER_OPTS Restart=on-failure [Install] WantedBy=multi-user.target EOF
kube-scheduler
#配置文件 cat > /opt/kubernetes/conf/kube-scheduler <<EOF KUBE_SCHEDULER_OPTS="--logtostderr=true \ --v=4 \ --master=127.0.0.1:8080 \ --leader-elect" EOF #启动文件 cat > /usr/lib/systemd/system/kube-scheduler.service <<EOF [Unit] Description=Kubernetes Scheduler Documentation=https://github.com/kubernetes/kubernetes [Service] EnvironmentFile=-/opt/kubernetes/conf/kube-scheduler ExecStart=/opt/kubernetes/bin/kube-scheduler $KUBE_SCHEDULER_OPTS Restart=on-failure [Install] WantedBy=multi-user.target EOF
kube-controller-manager
#配置文件 cat > cat /opt/kubernetes/conf/kube-controller-manager <<EOF KUBE_CONTROLLER_MANAGER_OPTS="--logtostderr=true \ --v=4 \ --master=127.0.0.1:8080 \ --leader-elect=true \ --address=127.0.0.1 \ --service-cluster-ip-range=10.10.10.0/24 \ --cluster-name=kubernetes \ --cluster-signing-cert-file=/opt/kubernetes/ssl/ca.pem \ --cluster-signing-key-file=/opt/kubernetes/ssl/ca-key.pem \ --service-account-private-key-file=/opt/kubernetes/ssl/ca-key.pem \ --root-ca-file=/opt/kubernetes/ssl/ca.pem" EOF #启动脚本 cat > /usr/lib/systemd/system/kube-controller-manager.service <<EOF [Unit] Description=Kubernetes Scheduler Documentation=https://github.com/kubernetes/kubernetes [Service] EnvironmentFile=-/opt/kubernetes/conf/kube-scheduler ExecStart=/opt/kubernetes/bin/kube-scheduler $KUBE_SCHEDULER_OPTS Restart=on-failure [Install] WantedBy=multi-user.target [root@master soft]# cat /usr/lib/systemd/system/kube-controller-manager.service [Unit] Description=Kubernetes Controller Manager Documentation=https://github.com/kubernetes/kubernetes [Service] EnvironmentFile=-/opt/kubernetes/conf/kube-controller-manager ExecStart=/opt/kubernetes/bin/kube-controller-manager $KUBE_CONTROLLER_MANAGER_OPTS Restart=on-failure [Install] WantedBy=multi-user.target EOF
5.启动master所有组件
#启动apiserver systemctl daemon-reload systemctl enable kube-apiserver systemctl restart kube-apiserver #启动kube-scheduler systemctl daemon-reload systemctl enable kube-scheduler systemctl restart kube-scheduler #启动kube-scheduler systemctl daemon-reload systemctl enable kube-scheduler systemctl restart kube-scheduler
6.查看各个组件状态,kubectl get cs如下图：
| 二、node节点组件部署 |
1.创建Node节点kubeconfig文件(此步骤在master上进行，创建完成下发到每个node)，此步骤依赖上次环境变量中生成的token，请确保echo $BOOTSTRAP_TOKEN有token值
#进入到证书目录 cd /opt/kubernetes/ssl/ # 创建指明api-server地址 export KUBE_APISERVER="https://10.1.210.33:6443" # 设置集群参数 kubectl config set-cluster kubernetes \ --certificate-authority=./ca.pem \ --embed-certs=true \ --server=${KUBE_APISERVER} \ --kubeconfig=bootstrap.kubeconfig # 设置客户端认证参数 kubectl config set-credentials kubelet-bootstrap \ --token=${BOOTSTRAP_TOKEN} \ --kubeconfig=bootstrap.kubeconfig # 设置上下文参数 kubectl config set-context default \ --cluster=kubernetes \ --user=kubelet-bootstrap \ --kubeconfig=bootstrap.kubeconfig # 设置默认上下文 kubectl config use-context default --kubeconfig=bootstrap.kubeconfig
2.下发kubeconfig文件(bootstrap.kubeconfig、kube-proxy.kubeconfig)
#下发node节点配置文件 scp *.kubeconfig node1:/opt/kubernetes/conf/ scp *.kubeconfig node2:/opt/kubernetes/conf/
3.选择一台node节点部署组件（下载server版本中已经有node组件）
为了方便，下面使用脚本生成配置文件和启动脚本：
kubelet组件
参数一：kubelet组件监听地址
参数二：dns，后续部署集群dns的地址
sh kubelet.sh 10.1.210.32 10.10.10.3
#!/bin/bash NODE_ADDRESS=${1:-"10.1.210.32"} DNS_SERVER_IP=${2:-"10.10.10.3"} cat <<EOF >/opt/kubernetes/conf/kubelet KUBELET_OPTS="--logtostderr=true \\ --v=4 \\ --address=${NODE_ADDRESS} \\ --hostname-override=${NODE_ADDRESS} \\ --kubeconfig=/opt/kubernetes/conf/kubelet.kubeconfig \\ --experimental-bootstrap-kubeconfig=/opt/kubernetes/conf/bootstrap.kubeconfig \\ --cert-dir=/opt/kubernetes/ssl \\ --allow-privileged=true \\ --cluster-dns=${DNS_SERVER_IP} \\ --cluster-domain=cluster.local \\ --fail-swap-on=false \\ --pod-infra-container-image=registry.cn-hangzhou.aliyuncs.com/google-containers/pause-amd64:3.0" EOF cat <<EOF >/usr/lib/systemd/system/kubelet.service [Unit] Description=Kubernetes Kubelet After=docker.service Requires=docker.service [Service] EnvironmentFile=-/opt/kubernetes/conf/kubelet ExecStart=/opt/kubernetes/bin/kubelet \$KUBELET_OPTS Restart=on-failure KillMode=process [Install] WantedBy=multi-user.target EOF systemctl daemon-reload systemctl enable kubelet systemctl restart kubelet
kubelet.sh
kube-proxy组件
参数一：kube-proxy 监听地址
sh proxy.sh 10.1.210.32
#!/bin/bash NODE_ADDRESS=${1:-"10.1.210.32"} cat <<EOF >/opt/kubernetes/conf/kube-proxy KUBE_PROXY_OPTS="--logtostderr=true \ --v=4 \ --hostname-override=${NODE_ADDRESS} \ --kubeconfig=/opt/kubernetes/conf/kube-proxy.kubeconfig" EOF cat <<EOF >/usr/lib/systemd/system/kube-proxy.service [Unit] Description=Kubernetes Proxy After=network.target [Service] EnvironmentFile=-/opt/kubernetes/conf/kube-proxy ExecStart=/opt/kubernetes/bin/kube-proxy \$KUBE_PROXY_OPTS Restart=on-failure [Install] WantedBy=multi-user.target EOF systemctl daemon-reload systemctl enable kube-proxy systemctl restart kube-proxy
proxy.sh
4.由于我们采用了RBAC授权机制，所以需要给kubelet组件授权(赋权操作在master上进行)
#创建角色并赋权可以使用kubectl create clusterrolebinding --help查看如何创建角色 kubectl create clusterrolebinding kubelet-bootstrap --clusterrole=system:node-bootstrapper --user=kubelet-bootstrap
#重启kubelet和kube-proxy
systemctl restart kubelet
systemctl restart kube-proxy
5.此时到mater查看(kubectl get csr)证书请求信息，是否有node请求集群证书,如下：
6.此时我们需要运行该节点请求证书文件
##使用kubectl certificate --help查看帮助 kubectl certificate approve node-csr-urT-yh6bTjMi_-XXaRSdzPTWRuAULBjuaP85RU7_v8U
7.查看节点是否加入，如果节点状态是Ready代表该节点已经加入到集群。
8.在另一个节点也做该操作，当然你也可以直接拷贝配置文件，修改配置信息，然后将宁一个节点加入到集群中，如图：
9.测试集群可用
#创建nginx pod kubectl run nginx --image=nginx --replicas=2 #查看pod kubectl get pod
| 三、部署Dashboard |
dashbord是k8s自带的一个webUI，可以查看一些基本信息，对我们了解集群状态有很大的帮助。
1.为了规范，我们将所有的yaml文件统一放在/opt/kubernetes/yaml下，在创建dasnbord之前需要创建角色。
kubectl create -f dashboard-rbac.yaml
dashboard-rbac.yaml
apiVersion: v1 kind: ServiceAccount metadata: labels: k8s-app: kubernetes-dashboard addonmanager.kubernetes.io/mode: Reconcile name: kubernetes-dashboard namespace: kube-system --- kind: ClusterRoleBinding apiVersion: rbac.authorization.k8s.io/v1beta1 metadata: name: kubernetes-dashboard-minimal namespace: kube-system labels: k8s-app: kubernetes-dashboard addonmanager.kubernetes.io/mode: Reconcile roleRef: apiGroup: rbac.authorization.k8s.io kind: ClusterRole name: cluster-admin subjects: - kind: ServiceAccount name: kubernetes-dashboard namespace: kube-system
2.为dashboard创建控制器,需要注意的是，将镜像改为阿里的源，不然会去google找镜像，导致下载失败。
kubectl create -f dashboard-deployment.yaml
dashboard-deployment.yaml
apiVersion: apps/v1beta2 kind: Deployment metadata: name: kubernetes-dashboard namespace: kube-system labels: k8s-app: kubernetes-dashboard kubernetes.io/cluster-service: "true" addonmanager.kubernetes.io/mode: Reconcile spec: selector: matchLabels: k8s-app: kubernetes-dashboard template: metadata: labels: k8s-app: kubernetes-dashboard annotations: scheduler.alpha.kubernetes.io/critical-pod: '' spec: serviceAccountName: kubernetes-dashboard containers: - name: kubernetes-dashboard image: registry.cn-hangzhou.aliyuncs.com/google_containers/kubernetes-dashboard-amd64:v1.7.1 resources: limits: cpu: 100m memory: 300Mi requests: cpu: 100m memory: 100Mi ports: - containerPort: 9090 protocol: TCP livenessProbe: httpGet: scheme: HTTP path: / port: 9090 initialDelaySeconds: 30 timeoutSeconds: 30 tolerations: - key: "CriticalAddonsOnly" operator: "Exists"
3.创建service用于暴露服务
kubectl create -f dashboard-service.yaml
dashboard-service.yaml
apiVersion: v1 kind: Service metadata: name: kubernetes-dashboard namespace: kube-system labels: k8s-app: kubernetes-dashboard kubernetes.io/cluster-service: "true" addonmanager.kubernetes.io/mode: Reconcile spec: type: NodePort selector: k8s-app: kubernetes-dashboard ports: - port: 80 targetPort: 9090
4.查看状态
#查看sevice kubectl get svc -n kube-system #查看pod kubectl get pods -n kube-system #查看所有信息 kubectl get all -n kube-system
5.根据以上信息80:18158，我们使用nodeip访问http://10.1.210.34:38158/查看仪表盘，到此，集群部署完毕。
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