kubeadm安装kubernetes 1.11.1（单master）

环境准备

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安装目标

安装 Docker 和 kubeadm
部署 Kubernetes Master
部署容器网络插件
部署 Dashboard 可视化插件

初始化设置

自行配置IP和主机名

关闭selinux

关闭firewall并关闭开机自启动

systemctl stop firewalld
systemctl disable firewalld
修改主机名
是master-80.111
关闭swap
swapoff -a
将/etc/fstab关于swap的内容注释

安装docker

yum -y install docker

启动docker

systemctl start docker

设置docker开机自启动

systemctl enable docker

安装kubeadm

配置kubeadm的yum源

vi /etc/yum.repos.d/kubernetes.repo

[kubernetes]
name=Kubernetes
baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64/
enabled=1
gpgcheck=0

安装1.11.1版本

yum install -y kubeadm-1.11.1 kubectl-1.11.1 kubelet-1.11.1

设置kubelet开机自启动并启动

systemctl enable kubelet.service && systemctl start kubelet

修改网络配置

vi /etc/sysctl.d/k8s.conf

net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
net.ipv4.ip_forward = 1

#sysctl --system

部署kubernetes的master节点

编写kubeadm.yaml

cd /etc/kubernetes/manifests
vi kubeadm.yaml

apiVersion: kubeadm.k8s.io/v1alpha1
kind: MasterConfiguration
controllerManagerExtraArgs:
 horizontal-pod-autoscaler-use-rest-clients: "true"
 horizontal-pod-autoscaler-sync-period: "10s"
 node-monitor-grace-period: "10s"
apiServerExtraArgs:
 runtime-config: "api/all=true"
kubernetesVersion: "v1.11.1"

说明

这个配置，我给kube-controller-manager 设置了：
horizontal-pod-autoscaler-use-rest-clients: "true"
表示部署的kube-controller-manager 能够使用自定义资源（Custom Metrics）进行自动水平扩展。

部署master

kubeadm init --config kubeadm.yaml
会出现以下结果

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k8s.gcr.io国内被墙了，需要无法直接使用，需要自己下载

docker pull mirrorgooglecontainers/kube-apiserver-amd64:v1.11.1
docker pull mirrorgooglecontainers/kube-controller-manager-amd64:v1.11.1
docker pull mirrorgooglecontainers/kube-scheduler-amd64:v1.11.1
docker pull mirrorgooglecontainers/kube-proxy-amd64:v1.11.1
docker pull mirrorgooglecontainers/pause:3.1
docker pull mirrorgooglecontainers/etcd-amd64:3.2.18
docker pull coredns/coredns:1.1.3

修改成自己需要的镜像名（根据自己情况修改）

docker tag docker.io/mirrorgooglecontainers/kube-apiserver-amd64:v1.11.1 k8s.gcr.io/kube-apiserver-amd64:v1.11.1
docker tag docker.io/mirrorgooglecontainers/kube-controller-manager-amd64:v1.11.1 k8s.gcr.io/kube-controller-manager-amd64:v1.11.1
docker tag docker.io/mirrorgooglecontainers/kube-scheduler-amd64:v1.11.1 k8s.gcr.io/kube-scheduler-amd64:v1.11.1
docker tag docker.io/mirrorgooglecontainers/kube-proxy-amd64:v1.11.1 k8s.gcr.io/kube-proxy-amd64:v1.11.1
docker tag docker.io/mirrorgooglecontainers/pause:3.1 k8s.gcr.io/pause:3.1
docker tag docker.io/mirrorgooglecontainers/etcd-amd64:3.2.18 k8s.gcr.io/etcd-amd64:3.2.18
docker tag docker.io/coredns/coredns:1.1.3 k8s.gcr.io/coredns:1.1.3

下载完镜像在执行kubeadm init --config kubeadm.yaml就不会报错了
正确结果如下图：

image.png

master的部署需要几分钟，这个kubeadm join命令，就是用来给这个Master节点添加更多工作节点（Worker）的命令。

查看master节点状态

[root@localhost ~]# kubectl get nodes

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报错

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解决办法

mkdir -p $HOME/.kube
cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
chown $(id -u):$(id -g) $HOME/.kube/config
或者
echo "export KUBECONFIG=/etc/kubernetes/admin.conf" >> ~/.bash_profile

7.部署网络插件

插件安装

网络插件安装很简单，只需要执行kubectl apply指令，以weave为例：

kubectl apply -f https://git.io/weave-kube-1.6

查看Pod节点状态

kubectl get pods -n kube-system

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上图看到所有的Pod都启动成功了，部署的 Weave 网络插件则在 kube-system 下面新建了一个名叫 weave-net-nxccd 的 Pod

删除污点

kubectl taint nodes --all node-role.kubernetes.io/master-

kubernetes部署就告一段落了，接下来部署插件

插件安装

Dashboard可视化插件

准备镜像

docker pull mirrorgooglecontainers/kubernetes-dashboard-amd64:v1.10.0
docker tag docker.io/mirrorgooglecontainers/kubernetes-dashboard-amd64:v1.10.0 k8s.gcr.io/kubernetes-dashboard-amd64:v1.10.0

安装插件

kubectl apply -f kubernetes-dashboard.yaml

文件内容如下：
cat kubernetes-dashboard.yaml

# 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
"kubernetes-dashboard.yaml" 162L, 4582C
          # - --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
  selector:
    k8s-app: kubernetes-dashboard

查看Dashboard对应的Pod状态

kubectl get pods -n kube-system

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开启代理

kubectl  proxy --address=0.0.0.0 --accept-hosts=^*$ &

登录地址

http://master-80.111:8001/api/v1/namespaces/kube-system/services/https:kubernetes-dashboard:/proxy/#!/overview?namespace=default

在登录界面选择跳过
显示如下

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因为跳过了登录页面，由于权限问题目前无法看到任何内容

授权Dashboard账户

创建dashboard-admin.yaml

vi dashboard-admin.yaml

apiVersion: rbac.authorization.k8s.io/v1beta1
kind: ClusterRoleBinding
metadata:
  name: kubernetes-dashboard
  labels:
    k8s-app: kubernetes-dashboard
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: cluster-admin
subjects:
- kind: ServiceAccount
  name: kubernetes-dashboard
  namespace: kube-system

部署dashboard-admin.yaml

kubectl create -f dashboard-admin.yaml

页面访问

image.png

安装heapster插件

为了能在Dashboard中查看节点状态，需要安装Dashboard Heapster插件

准备镜像

docker pull mirrorgooglecontainers/heapster-amd64:v1.5.4
docker pull mirrorgooglecontainers/heapster-influxdb-amd64:v1.5.2
docker pull mirrorgooglecontainers/heapster-grafana-amd64:v5.0.4
docker tag docker.io/mirrorgooglecontainers/heapster-amd64:v1.5.4 k8s.gcr.io/heapster-amd64:v1.5.4
docker tag docker.io/mirrorgooglecontainers/heapster-influxdb-amd64:v1.5.2 k8s.gcr.io/heapster-influxdb-amd64:v1.5.2
docker tag docker.io/mirrorgooglecontainers/heapster-grafana-amd64:v5.0.4 k8s.gcr.io/heapster-grafana-amd64:v5.0.4

准备部署文件

grafana.yaml

cat grafana.yaml

apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: monitoring-grafana
  namespace: kube-system
spec:
  replicas: 1
  template:
    metadata:
      labels:
        task: monitoring
        k8s-app: grafana
    spec:
      containers:
      - name: grafana
        image: k8s.gcr.io/heapster-grafana-amd64:v5.0.4
        ports:
        - containerPort: 3000
          protocol: TCP
        volumeMounts:
        - mountPath: /etc/ssl/certs
          name: ca-certificates
          readOnly: true
        - mountPath: /var
          name: grafana-storage
        env:
        - name: INFLUXDB_HOST
          value: monitoring-influxdb
        - name: GF_SERVER_HTTP_PORT
          value: "3000"
          # The following env variables are required to make Grafana accessible via
          # the kubernetes api-server proxy. On production clusters, we recommend
          # removing these env variables, setup auth for grafana, and expose the grafana
          # service using a LoadBalancer or a public IP.
        - name: GF_AUTH_BASIC_ENABLED
          value: "false"
        - name: GF_AUTH_ANONYMOUS_ENABLED
          value: "true"
        - name: GF_AUTH_ANONYMOUS_ORG_ROLE
          value: Admin
        - name: GF_SERVER_ROOT_URL
          # If you're only using the API Server proxy, set this value instead:
          # value: /api/v1/namespaces/kube-system/services/monitoring-grafana/proxy
          value: /
      volumes:
      - name: ca-certificates
        hostPath:
          path: /etc/ssl/certs
      - name: grafana-storage
        emptyDir: {}
---
apiVersion: v1
kind: Service
metadata:
  labels:
    # For use as a Cluster add-on (https://github.com/kubernetes/kubernetes/tree/master/cluster/addons)
    # If you are NOT using this as an addon, you should comment out this line.
    kubernetes.io/cluster-service: 'true'
    kubernetes.io/name: monitoring-grafana
  name: monitoring-grafana
  namespace: kube-system
spec:
  # In a production setup, we recommend accessing Grafana through an external Loadbalancer
  # or through a public IP.
  # type: LoadBalancer
  # You could also use NodePort to expose the service at a randomly-generated port
  # type: NodePort
  ports:
  - port: 80
    targetPort: 3000
  selector:
    k8s-app: grafana 

heapster.yaml

cat heapster.yaml

apiVersion: v1
kind: ServiceAccount
metadata:
  name: heapster
  namespace: kube-system
---
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: heapster
  namespace: kube-system
spec:
  replicas: 1
  template:
    metadata:
      labels:
        task: monitoring
        k8s-app: heapster
    spec:
      serviceAccountName: heapster
      containers:
      - name: heapster
        image: k8s.gcr.io/heapster-amd64:v1.5.4
        imagePullPolicy: IfNotPresent
        command:
        - /heapster
        - --source=kubernetes:https://kubernetes.default?kubeletHttps=true&kubeletPort=10250&insecure=true
        - --sink=influxdb:http://monitoring-influxdb.kube-system.svc:8086
---
apiVersion: v1
kind: Service
metadata:
  labels:
    task: monitoring
    # For use as a Cluster add-on (https://github.com/kubernetes/kubernetes/tree/master/cluster/addons)
    # If you are NOT using this as an addon, you should comment out this line.
    kubernetes.io/cluster-service: 'true'
    kubernetes.io/name: Heapster
  name: heapster
  namespace: kube-system
spec:
  ports:
  - port: 80
    targetPort: 8082
  selector:
    k8s-app: heapster

heapster-rbac.yaml

cat heapster-rbac.yaml

kind: ClusterRoleBinding
apiVersion: rbac.authorization.k8s.io/v1beta1
metadata:
  name: heapster
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: system:heapster
subjects:
- kind: ServiceAccount
  name: heapster
  namespace: kube-system
---
kind: ClusterRoleBinding
apiVersion: rbac.authorization.k8s.io/v1beta1
metadata:
  name: heapster-kubelet-api
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: system:kubelet-api-admin
subjects:
- kind: ServiceAccount
  name: heapster
  namespace: kube-system

influxdb.yaml

cat influxdb.yaml

apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: monitoring-influxdb
  namespace: kube-system
spec:
  replicas: 1
  template:
    metadata:
      labels:
        task: monitoring
        k8s-app: influxdb
    spec:
      containers:
      - name: influxdb
        image: k8s.gcr.io/heapster-influxdb-amd64:v1.5.2
        volumeMounts:
        - mountPath: /data
          name: influxdb-storage
      volumes:
      - name: influxdb-storage
        emptyDir: {}
---
apiVersion: v1
kind: Service
metadata:
  labels:
    task: monitoring
    # For use as a Cluster add-on (https://github.com/kubernetes/kubernetes/tree/master/cluster/addons)
    # If you are NOT using this as an addon, you should comment out this line.
    kubernetes.io/cluster-service: 'true'
    kubernetes.io/name: monitoring-influxdb
  name: monitoring-influxdb
  namespace: kube-system
spec:
  ports:
  - port: 8086
    targetPort: 8086
  selector:
k8s-app: influxdb 

部署插件

kubectl create -f ./grafana.yaml
kubectl create -f ./heapster.yaml
kubectl create -f ./influxdb.yaml 
kubectl create -f ./heapster-rbac.yaml

Dashboard显示

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