kubernetes安装（基于CentOS7，kubeadm）

kubeadm可以帮助你快速部署一套kubernetes集群。kubeadm设计目的为新用户开始尝试kubernetes提供一种简单的方法。不适用于生产环境。

1、安装要求及目标

禁止swap分区（kubernetes不支持）
可以访问外网
集群机器之间网络互通

所以节点上安装Docker和kubeadm
部署Kubernetes Master
部署网络管理插件
部署Kubernetes Node，将节点加入Kubenetes集群中
部署Dashboard Web页面，可视化查看Kubernetes资源

关闭防火墙：

systemctl stop firewalld && systemctl disable firewalld

关闭selinux：

sed -i 's/enforcing/disabled/' /etc/selinux/config
setenforce 0　 　　# 使设置生效
getenforce　　　　　# 查看

关闭swap：

swapoff -a                                # 临时关闭

sed -i 's/.\\*swap.\\*/#&/' /etc/fstab    # 永久关闭

添加主机名与IP对应关系：

vim /etc/hosts
192.168.174.138 k8s-master 
192.168.174.139 k8s-node1 
192.168.174.140 k8s-node2

将桥接的IPV4流量传递到iptables链：

cat > /etc/sysctl.d/k8s.conf << EOF
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
EOF

sysctl --system　　# 是配置生效

2、集群节点安装Docker/Kubeadm/kubelet

安装Docker：

yum install -y wget

yum install yum-utils device-mapper-persistent-data lvm2

yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo

yum update && yum install docker-ce-18.06.2.ce

mkdir /etc/docker

cat > /etc/docker/daemon.json <<EOF
{
  "exec-opts": ["native.cgroupdriver=systemd"],
  "log-driver": "json-file",
  "log-opts": {
    "max-size": "100m"
  },
  "storage-driver": "overlay2",
  "storage-opts": [
    "overlay2.override_kernel_check=true"
  ]
}
EOF

mkdir -p /etc/systemd/system/docker.service.d

systemctl daemon-reload && systemctl restart docker && systemctl enable docker

docker --version

安装Kubernetes：

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.gpg https://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg
EOF

yum install -y kubelet kubeadm kubectl

systemctl enable kubelet && systemctl start kubelet

# 在Master上执行
kubeadm init \
--apiserver-advertise-address=192.168.174.138 \
--image-repository registry.aliyuncs.com/google_containers \
--kubernetes-version v1.14.2 \
--service-cidr=10.1.0.0/16 \
--pod-network-cidr=10.244.0.0/16

kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml

　mkdir -p $HOME/.kube
　sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
　sudo chown $(id -u):$(id -g) $HOME/.kube/config

　# 在Node上执行

　kubeadm join 192.168.174.138:6443 --token 0605l0.mezfbd5bq517d8mp \
--discovery-token-ca-cert-hash sha256:a1fdab515df1ce5cb5ff5994c910e7a2aa9625d025469af06c15edccd5208a35

# 查看kubernetes运行状态

　kubectl get pod -n kube-system

kubectl get node

3、部署kubernetes-dashboard

docker pull k8s.gcr.io/kubernetes-dashboard-amd64:v1.10.1
wget https://raw.githubusercontent.com/kubernetes/dashboard/v1.10.1/src/deploy/recommended/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
  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/v1
kind: RoleBinding
metadata:
  name: kubernetes-dashboard-minimal
  namespace: kube-system
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: Role
  name: kubernetes-dashboard-minimal
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: k8s.gcr.io/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:
type: NodePort
  ports:
    - port: 443
      targetPort: 8443
　　　 nodePort: 30000
  selector:
    k8s-app: kubernetes-dashboard

kubectl apply -f kubernetes-dashboard.yaml

创建令牌：授权，对所有名称空间都有admin的权限

# 创建serviceaccount
kubectl create serviceaccount dashboard-serviceaccount-admin -n kube-system

# 创建clusterrolebinding
kubectl create clusterrolebinding dashboard-cluster-admin --clusterrole=cluster-admin --serviceaccount=kube-system:dashboard-serviceaccount-admin

# 获取令牌
kubectl get secret -n kube-system |grep dashboard-serviceaccount-admin-token
# 查看dashboard-serviceaccount中的口令
kubectl describe secret dashboard-serviceaccount-admin-token-5vc54 -n kube-system

创建Kubeconfig，只对default名称空间有admin的权限

# 创建serviceaccount
kubectl create serviceaccount def-ns-dashboard-sa -n default

# 创建rolebinding
 kubectl create rolebinding def-ns-dashboard-rb --clusterrole=cluster-admin --serviceaccount=default:def-ns-dashboard-sa

# 在secret中查找def-ns-dashboard-sa
kubectl get secret

# 查看def-ns-dashboard-sa中的口令
kubectl describe secret def-ns-dashboard-sa-token-b8plm

腾讯云CVM上用kubeadm安装Kubernetes集群（版本1.14.0）

使用harbor搭建私有docker镜像仓库

来源：oschina

链接：https://my.oschina.net/u/4274903/blog/3581735

标签

Kube

Docker

def

bridge