centos7 安裝 kubernetes1.16.1（2019-10-17最新版）

http://www.itdecent.cn/p/a77f03e6d7c4

2020/4/20 依舊可用

準(zhǔn)備工作

  • centos7.6，雙核
  • 關(guān)閉防火墻
  • 關(guān)閉swap

安裝Docker

安裝docker的yum源

yum install -y yum-utils device-mapper-persistent-data lvm2
yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo

安裝最新版（推薦）

yum install -y docker-ce

選擇安裝版本（不推薦）

查看最新的Docker版本
yum list docker-ce  --showduplicates |sort -r
輸出如下
docker-ce.x86_64            3:19.03.3-3.el7                    docker-ce-stable 
docker-ce.x86_64            3:19.03.3-3.el7                    @docker-ce-stable
docker-ce.x86_64            3:19.03.2-3.el7                    docker-ce-stable 
docker-ce.x86_64            3:19.03.1-3.el7                    docker-ce-stable
選擇指定版本進(jìn)行安裝（不推薦）
yum install -y --setopt=obsoletes=0 docker-ce-18.09.6-3.el7

啟動(dòng)并設(shè)置開(kāi)機(jī)啟動(dòng)

systemctl enable docker
systemctl start docker

使用kubeadm部署Kubernetes

安裝kubeadm和kubelet

設(shè)置Kubernetes yum源

cat <<EOF > /etc/yum.repos.d/kubernetes.repo
[kubernetes]
name=Kubernetes
baseurl=http://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64
enabled=1
gpgcheck=0
gpgkey=http://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg
       http://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg
EOF

安裝最新版（推薦）

yum install -y kubelet  kubeadm  kubectl  --disableexcludes=kubernetes

安裝指定版本（不推薦）

查看kubelet版本
yum list kubelet  --showduplicates |sort -r
安裝指定版本
yum install -y kubelet-1.16.1  kubeadm-1.16.1  kubectl-1.16.1  --disableexcludes=kubernetes

在各節(jié)點(diǎn)開(kāi)機(jī)啟動(dòng)kubelet服務(wù)

systemctl enable kubelet.service
systemctl start kubelet.service
systemctl status kubelet.service
journalctl -xefu kubelet

初始化

初始化之前執(zhí)行
cat <<EOF >  /etc/sysctl.d/k8s.conf
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
EOF

sysctl --system
執(zhí)行初始化，指定aliyun鏡像
kubeadm init \
   --image-repository registry.aliyuncs.com/google_containers  \
  --kubernetes-version=v1.16.1 \
  --pod-network-cidr=10.244.0.0/16 \
  --ignore-preflight-errors=Swap \
  -v=4 \
  --apiserver-advertise-address=172.22.76.1
  • kubernetes-version 需要根據(jù)情況修改
  • apiserver-advertise-address 需要根據(jù)情況修改
設(shè)置環(huán)境變量，KUBECONFIG
echo "export KUBECONFIG=/etc/kubernetes/admin.conf" >> .bashrc
集群初始化如果遇到問(wèn)題，可以使用下面的命令進(jìn)行清理：
kubeadm reset

創(chuàng)建token

kubeadm token create --print-join-command
輸出如下，node節(jié)點(diǎn)通過(guò)執(zhí)行下面語(yǔ)句加入到集群當(dāng)中
kubeadm join 172.22.76.1:6443 --token 4dwid7.x6iw43nicdqaqwvo     --discovery-token-ca-cert-hash sha256:ba3f67dab7b418b2788053ec5c898ecdcba0bea3b6201f108b5d08d45524fd99

刪除 master 污點(diǎn)（本地測(cè)試用）

查看污點(diǎn)
kubectl describe node host1
輸出有如下內(nèi)容
Taints:             node-role.kubernetes.io/master:NoSchedule
刪除 master 污點(diǎn)
kubectl taint node host1 node-role.kubernetes.io/master:NoSchedule-

安裝flannel

修改系統(tǒng)配置
sysctl net.bridge.bridge-nf-call-iptables=1
下載flannel yum文件
wget https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml
修改docker鏡像地址為aliyun地址
sed 's/quay.io\/coreos/registry.cn-beijing.aliyuncs.com\/imcto/g' kube-flannel.yml
部署flannel
kubectl apply -f kube-flannel.yml

異常處理

[kubelet-check] It seems like the kubelet isn't running or healthy.

[kubelet-check] The HTTP call equal to 'curl -sSL http://localhost:10248/healthz' failed with error: Get http://localhost:10248

  • 可能是防火墻沒(méi)有關(guān)閉引起的，關(guān)閉防火墻
systemctl stop firewalld
systemctl disable firewalld
setenforce 0
sed -ie 's/SELINUX=enforcing/SELINUX=disabled/g' /etc/selinux/config

The connection to the server localhost:8080 was refused - did you specify the right host or port?

export KUBECONFIG=/etc/kubernetes/admin.conf

參考 https://www.cnblogs.com/lkun/p/9566307.html

安裝Kubernetes報(bào)錯(cuò)：STATUS NotReady

部署flannel解決

參考 http://www.itdecent.cn/p/1bbb32c02e77

部署kubernetes-dashboard

kubectl delete ns kubernetes-dashboard
kubectl delete ClusterRoleBinding kubernetes-dashboard
kubectl delete ServiceAccount kubernetes-dashboard
kubectl delete ClusterRole kubernetes-dashboard
kubectl delete ClusterRoleBinding admin-user
kubectl delete ServiceAccount admin-user
kubectl delete ServiceAccount cluster-admin

下載dashboard的yaml文件

wget https://raw.githubusercontent.com/kubernetes/dashboard/v2.0.0-beta5/aio/deploy/alternative.yaml

修改配置

==默認(rèn)情況無(wú)法通過(guò)外部訪(fǎng)問(wèn)，修改其中關(guān)鍵配置。在結(jié)尾為兩文檔內(nèi)容==

  • 修改 kubernetes-dashboard:ServiceAccount，name由kubernetes-dashboard修改為admin-user

  • 修改 kubernetes-dashboard:Service，添加 type: NodePort，同時(shí)在 ports 節(jié)點(diǎn)下添加 nodePort: 30090，供外部訪(fǎng)問(wèn)

  • 修改 kubernetes-dashboard:ClusterRoleBinding，metadata:name修改為admin-user，roleRef:name修改為cluster-admin，subjects:name修改為admin-user

  • 修改 kubernetes-dashboard:Deployment，添加 - --enable-skip-login 跳過(guò)登錄，serviceAccountName修改為admin-user

  • 修改 dashboard-metrics-scraper:Deployment，serviceAccountName 修改為 admin-user

部署dashboard

kubectl apply -f alternative.yaml

訪(fǎng)問(wèn)dashboard

http://172.22.76.1:30090

常用命令

kubectl get pods --namespace=kubernetes-dashboard
kubectl get services --namespace=kubernetes-dashboard

參考文檔

https://github.com/kubernetes/dashboard
https://github.com/kubernetes/dashboard/blob/master/docs/user/installation.md
https://github.com/kubernetes/dashboard/blob/master/docs/user/access-control/creating-sample-user.md

原

# 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.

apiVersion: v1
kind: Namespace
metadata:
  name: kubernetes-dashboard

---

apiVersion: v1
kind: ServiceAccount
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard
  namespace: kubernetes-dashboard

---

kind: Service
apiVersion: v1
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard
  namespace: kubernetes-dashboard
spec:
  ports:
    - port: 80
      targetPort: 9090
  selector:
    k8s-app: kubernetes-dashboard

---

apiVersion: v1
kind: Secret
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard-csrf
  namespace: kubernetes-dashboard
type: Opaque
data:
  csrf: ""

---

apiVersion: v1
kind: Secret
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard-key-holder
  namespace: kubernetes-dashboard
type: Opaque

---

kind: ConfigMap
apiVersion: v1
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard-settings
  namespace: kubernetes-dashboard

---

kind: Role
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard
  namespace: kubernetes-dashboard
rules:
  # Allow Dashboard to get, update and delete Dashboard exclusive secrets.
  - apiGroups: [""]
    resources: ["secrets"]
    resourceNames: ["kubernetes-dashboard-key-holder", "kubernetes-dashboard-certs", "kubernetes-dashboard-csrf"]
    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.
  - apiGroups: [""]
    resources: ["services"]
    resourceNames: ["heapster", "dashboard-metrics-scraper"]
    verbs: ["proxy"]
  - apiGroups: [""]
    resources: ["services/proxy"]
    resourceNames: ["heapster", "http:heapster:", "https:heapster:", "dashboard-metrics-scraper", "http:dashboard-metrics-scraper"]
    verbs: ["get"]

---

kind: ClusterRole
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard
rules:
  # Allow Metrics Scraper to get metrics from the Metrics server
  - apiGroups: ["metrics.k8s.io"]
    resources: ["pods", "nodes"]
    verbs: ["get", "list", "watch"]

---

apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard
  namespace: kubernetes-dashboard
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: Role
  name: kubernetes-dashboard
subjects:
  - kind: ServiceAccount
    name: kubernetes-dashboard
    namespace: kubernetes-dashboard

---

apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  name: kubernetes-dashboard
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: kubernetes-dashboard
subjects:
  - kind: ServiceAccount
    name: kubernetes-dashboard
    namespace: kubernetes-dashboard

---

kind: Deployment
apiVersion: apps/v1
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard
  namespace: kubernetes-dashboard
spec:
  replicas: 1
  revisionHistoryLimit: 10
  selector:
    matchLabels:
      k8s-app: kubernetes-dashboard
  template:
    metadata:
      labels:
        k8s-app: kubernetes-dashboard
    spec:
      containers:
        - name: kubernetes-dashboard
          image: kubernetesui/dashboard:v2.0.0-beta5
          ports:
            - containerPort: 9090
              protocol: TCP
          args:
            - --namespace=kubernetes-dashboard
            - --enable-insecure-login
          # 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:
            # Create on-disk volume to store exec logs
            - mountPath: /tmp
              name: tmp-volume
          livenessProbe:
            httpGet:
              path: /
              port: 9090
            initialDelaySeconds: 30
            timeoutSeconds: 30
          securityContext:
            allowPrivilegeEscalation: false
            readOnlyRootFilesystem: true
            runAsUser: 1001
            runAsGroup: 2001
      volumes:
        - name: tmp-volume
          emptyDir: {}
      serviceAccountName: kubernetes-dashboard
      nodeSelector:
        "beta.kubernetes.io/os": linux
      # Comment the following tolerations if Dashboard must not be deployed on master
      tolerations:
        - key: node-role.kubernetes.io/master
          effect: NoSchedule

---

kind: Service
apiVersion: v1
metadata:
  labels:
    k8s-app: dashboard-metrics-scraper
  name: dashboard-metrics-scraper
  namespace: kubernetes-dashboard
spec:
  ports:
    - port: 8000
      targetPort: 8000
  selector:
    k8s-app: dashboard-metrics-scraper

---

kind: Deployment
apiVersion: apps/v1
metadata:
  labels:
    k8s-app: dashboard-metrics-scraper
  name: dashboard-metrics-scraper
  namespace: kubernetes-dashboard
spec:
  replicas: 1
  revisionHistoryLimit: 10
  selector:
    matchLabels:
      k8s-app: dashboard-metrics-scraper
  template:
    metadata:
      labels:
        k8s-app: dashboard-metrics-scraper
      annotations:
        seccomp.security.alpha.kubernetes.io/pod: 'runtime/default'
    spec:
      containers:
        - name: dashboard-metrics-scraper
          image: kubernetesui/metrics-scraper:v1.0.1
          ports:
            - containerPort: 8000
              protocol: TCP
          livenessProbe:
            httpGet:
              scheme: HTTP
              path: /
              port: 8000
            initialDelaySeconds: 30
            timeoutSeconds: 30
          volumeMounts:
          - mountPath: /tmp
            name: tmp-volume
          securityContext:
            allowPrivilegeEscalation: false
            readOnlyRootFilesystem: true
            runAsUser: 1001
            runAsGroup: 2001
      serviceAccountName: kubernetes-dashboard
      nodeSelector:
        "beta.kubernetes.io/os": linux
      # Comment the following tolerations if Dashboard must not be deployed on master
      tolerations:
        - key: node-role.kubernetes.io/master
          effect: NoSchedule
      volumes:
        - name: tmp-volume
          emptyDir: {}

修改后

# 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.

apiVersion: v1
kind: Namespace
metadata:
  name: kubernetes-dashboard

---

apiVersion: v1
kind: ServiceAccount
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: admin-user
  namespace: kubernetes-dashboard

---

kind: Service
apiVersion: v1
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard
  namespace: kubernetes-dashboard
spec:
  ports:
    - port: 80
      targetPort: 9090
      nodePort: 30090

  selector:
    k8s-app: kubernetes-dashboard
  type: NodePort


---

apiVersion: v1
kind: Secret
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard-csrf
  namespace: kubernetes-dashboard
type: Opaque
data:
  csrf: ""

---

apiVersion: v1
kind: Secret
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard-key-holder
  namespace: kubernetes-dashboard
type: Opaque

---

kind: ConfigMap
apiVersion: v1
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard-settings
  namespace: kubernetes-dashboard

---

kind: Role
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard
  namespace: kubernetes-dashboard
rules:
  # Allow Dashboard to get, update and delete Dashboard exclusive secrets.
  - apiGroups: [""]
    resources: ["secrets"]
    resourceNames: ["kubernetes-dashboard-key-holder", "kubernetes-dashboard-certs", "kubernetes-dashboard-csrf"]
    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.
  - apiGroups: [""]
    resources: ["services"]
    resourceNames: ["heapster", "dashboard-metrics-scraper"]
    verbs: ["proxy"]
  - apiGroups: [""]
    resources: ["services/proxy"]
    resourceNames: ["heapster", "http:heapster:", "https:heapster:", "dashboard-metrics-scraper", "http:dashboard-metrics-scraper"]
    verbs: ["get"]

---

kind: ClusterRole
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard
rules:
  # Allow Metrics Scraper to get metrics from the Metrics server
  - apiGroups: ["metrics.k8s.io"]
    resources: ["pods", "nodes"]
    verbs: ["get", "list", "watch"]

---

apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard
  namespace: kubernetes-dashboard
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: Role
  name: kubernetes-dashboard
subjects:
  - kind: ServiceAccount
    name: kubernetes-dashboard
    namespace: kubernetes-dashboard

---


apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  name: admin-user
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: cluster-admin
subjects:
- kind: ServiceAccount
  name: admin-user
  namespace: kubernetes-dashboard
  
  
---


kind: Deployment
apiVersion: apps/v1
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard
  namespace: kubernetes-dashboard
spec:
  replicas: 1
  revisionHistoryLimit: 10
  selector:
    matchLabels:
      k8s-app: kubernetes-dashboard
  template:
    metadata:
      labels:
        k8s-app: kubernetes-dashboard
    spec:
      containers:
        - name: kubernetes-dashboard
          image: kubernetesui/dashboard:v2.0.0-beta5
          ports:
            - containerPort: 9090
              protocol: TCP
          args:
            - --namespace=kubernetes-dashboard
            - --enable-insecure-login
            - --enable-skip-login
          # 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:
            # Create on-disk volume to store exec logs
            - mountPath: /tmp
              name: tmp-volume
          livenessProbe:
            httpGet:
              path: /
              port: 9090
            initialDelaySeconds: 30
            timeoutSeconds: 30
          securityContext:
            allowPrivilegeEscalation: false
            readOnlyRootFilesystem: true
            runAsUser: 1001
            runAsGroup: 2001
      volumes:
        - name: tmp-volume
          emptyDir: {}
      serviceAccountName: admin-user
      nodeSelector:
        "beta.kubernetes.io/os": linux
      # Comment the following tolerations if Dashboard must not be deployed on master
      tolerations:
        - key: node-role.kubernetes.io/master
          effect: NoSchedule

---

kind: Service
apiVersion: v1
metadata:
  labels:
    k8s-app: dashboard-metrics-scraper
  name: dashboard-metrics-scraper
  namespace: kubernetes-dashboard
spec:
  ports:
    - port: 8000
      targetPort: 8000
  selector:
    k8s-app: dashboard-metrics-scraper

---

kind: Deployment
apiVersion: apps/v1
metadata:
  labels:
    k8s-app: dashboard-metrics-scraper
  name: dashboard-metrics-scraper
  namespace: kubernetes-dashboard
spec:
  replicas: 1
  revisionHistoryLimit: 10
  selector:
    matchLabels:
      k8s-app: dashboard-metrics-scraper
  template:
    metadata:
      labels:
        k8s-app: dashboard-metrics-scraper
      annotations:
        seccomp.security.alpha.kubernetes.io/pod: 'runtime/default'
    spec:
      containers:
        - name: dashboard-metrics-scraper
          image: kubernetesui/metrics-scraper:v1.0.1
          ports:
            - containerPort: 8000
              protocol: TCP
          livenessProbe:
            httpGet:
              scheme: HTTP
              path: /
              port: 8000
            initialDelaySeconds: 30
            timeoutSeconds: 30
          volumeMounts:
          - mountPath: /tmp
            name: tmp-volume
          securityContext:
            allowPrivilegeEscalation: false
            readOnlyRootFilesystem: true
            runAsUser: 1001
            runAsGroup: 2001
      serviceAccountName: admin-user
      nodeSelector:
        "beta.kubernetes.io/os": linux
      # Comment the following tolerations if Dashboard must not be deployed on master
      tolerations:
        - key: node-role.kubernetes.io/master
          effect: NoSchedule
      volumes:
        - name: tmp-volume
          emptyDir: {}
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