kubernetes部署

# 主机规划

##主机节点
172.105.197.104     k-master
103.29.68.48        k-node01
172.104.116.143     k-node02

##设置hostname
hostnamectl set-hostname k-master

##配置hosts文件
vi /etc/hosts

#master节点安装

##关闭防火墙

systemctl stop firewalld
    systemctl disable firewalld

##安装kubernetes和etcd

yum install etcd kubernetes -y
    yum install *rhsm*
    
##安装flannel

yum install flannel -y
    
##配置master节点

vi /etc/etcd/etcd.conf
    :1,$s/localhost/0.0.0.0/g
    
    vi /etc/sysconfig/docker
    OPTIONS='--selinux-enabled=false --insecure-registry gcr.io --log-driver=journald --signature-verification=false'
    
    vi /etc/kubernetes/apiserver
    #去掉ServiceAccount
    KUBE_API_ADDRESS="--insecure-bind-address=0.0.0.0"
    KUBE_ETCD_SERVERS="--etcd-servers=http://k-master:2379"
    KUBE_SERVICE_ADDRESSES="--service-cluster-ip-range=10.254.0.0/16"
    KUBE_ADMISSION_CONTROL="--admission-control=NamespaceLifecycle,NamespaceExists,LimitRanger,SecurityContextDeny,ResourceQuota"
    KUBE_API_ARGS="--insecure-port=8080 --service-node-port-range=1-65535 --logtostderr=false --log-dir=/var/log/kubeneters --v=2"
    #etcdctl rm /registry/services/specs/default/kubernetes
    
    vi /etc/kubernetes/controller-manager 
    KUBE_CONTROLLER_MANAGER_ARGS="--master=http://k-master:8080 --logtostderr=false --log-dir=/var/log/kubeneters --v=2"
    
    vi /etc/kubernetes/scheduler 
    KUBE_SCHEDULER_ARGS="--master=http://k-master:8080 --logtostderr=false --log-dir=/var/log/kubeneters --v=2"
    
    #cat /usr/lib/systemd/system/flanneld.service
    vi /etc/sysconfig/flanneld
    FLANNEL_ETCD_ENDPOINTS="http://k-master:2379"
    FLANNEL_ETCD_PREFIX="/atomic.io/network"

todo: ca认证配置, 内网registry配置

##启动服务

systemctl start etcd
    
    #flannel网络配置
    etcdctl set /atomic.io/network/config '{"network":"10.1.0.0/16"}'
    
    systemctl start flanneld
    systemctl start kube-apiserver
    systemctl start kube-controller-manager
    systemctl start kube-scheduler
    
    systemctl enable etcd,flanneld,kube-apiserver,kube-controller-manager,kube-scheduler
    
#node节点安装

##关闭防火墙

systemctl stop firewalld
    systemctl disable firewalld

##安装kubernetes和etcd

yum install kubernetes -y
    yum install *rhsm*
    
##安装flannel

yum install flannel -y
    
##配置node节点

vi /etc/sysconfig/docker
    OPTIONS='--selinux-enabled=false --insecure-registry gcr.io --log-driver=journald --signature-verification=false'
    
    vi /etc/kubernetes/kubelet 
    KUBELET_ADDRESS="--address=0.0.0.0"
    KUBELET_HOSTNAME="--hostname-override=k-node02"
    KUBELET_API_SERVER="--api-servers=http://k-master:8080"
    KUBELET_ARGS="--logtostderr=false --log-dir=/var/log/kubeneters --v=2"
    
    vi /etc/kubernetes/proxy 
    KUBE_MASTER="--master=http://k-master:8080"
    KUBE_PROXY_ARGS="--logtostderr=false --log-dir=/var/log/kubeneters --v=2"
    
    #cat /usr/lib/systemd/system/flanneld.service
    vi /etc/sysconfig/flanneld
    FLANNEL_ETCD_ENDPOINTS="http://k-master:2379"
    FLANNEL_ETCD_PREFIX="/atomic.io/network"
    
    
    vi /etc/kubernetes/config

todo: ca认证配置, 内网registry配置

##启动服务

systemctl start flanneld
    systemctl start docker
    systemctl start kubelet
    systemctl start kube-proxy

#配置dns服务

Kubernates提供的虚拟dns服务名为skydns, 有四个组件组成:

- etcd: dns存储
- kube2sky: 将kubernetes master中的service注册到etcd.
- skydns: 提供dns服务域名解析服务
- healthz: 提供对skydns服务的健康检查功能

![title](/api/file/getImage?fileId=5bae491e0f93bd6648000926)

##skydns服务配置

skydns服务有一个rc和一个service组成.

```
apiVersion: v1
kind: ReplicationController
metadata:
  name: kube-dns-v11
  namespace: kube-system
  labels:
    k8s-app: kube-dns
    version: v11
    kubernetes.io/cluster-service: "true"
  spec:
    replicas: 1
    selector:
      k8s-app: kube-dns
      version: v11
    template:
      metadata:
        labels:
          k8s-app: kube-dns
          version: v11
          kubernetes.io/cluster-service: "true"
      spec:
        containers:
        - name: etcd
          image: gcr.io/google_containers/etcd-amd64:2.2.1
          resouces:
            limits:
              cpu: 100m
              memory: 50Mi
            requests:
              cpu: 100m
              memory: 50Mi
          command:
          - /usr/local/bin/etcd
          - -data-dir
          - /tmp/data
          - -listen-client-urls
          - http://127.0.0.1:2379,http://127.0.0.1:4001
          - -advertise-client-urls
          - http://127.0.0.1:2379,http://127.0.0.1:4001
          - -initial-cluster-token
          - skydns-etcd
          volumeMounts:
          - name: etcd-storage
            mountPath: /tmp/data
        - name: kube2sky
          image: gcr.io/google_containers/kube2sky-amd64:1.15
          resouces:
            limits:
              cpu: 100m
              memory: 50Mi
            requests:
              cpu: 100m
              memory: 50Mi
          livenessProbe:
            httpGet:
              path: /healthz
              port: 8080
              scheme: HTTP
            initialDelaySeconds: 60
            timeoutSeconds: 5
            successThreshold: 1
            failureThreshold: 5
          readinessProbe:
            httpGet:
              path: /readiness
              port: 8081
              scheme: HTTP
            initialDelaySeconds: 30
            timeoutSeconds: 5
          args:
          - --kube-master-url=http://192.168.18.3:8080
          - --domain=cluster.local
        - name: skydns
          image: gcr.io/google_containers/skydns:2015-10-13-8c72f8c
          resouces:
            limits:
              cpu: 100m
              memory: 50Mi
            requests:
              cpu: 100m
              memory: 50Mi
          args:
          - -machines=http://127.0.0.1:4001
          - -addr-0.0.0.0:53
          - -ns-rotate=false
          - -domain-cluster.local
          ports:
          - containerPort: 53
            name: dns
            protocol: UDP
          - containerPort: 53
            name: dns-tcp
            protocol: TCP
        - name: healthz
          image: gcr.io/google_containers/exechealthz:1.0
          resouces:
            limits:
              cpu: 10m
              memory: 20Mi
            requests:
              cpu: 10m
              memory: 20Mi
          args:
          - -cmd=nslookup kubernetes.default.svc.clouster.local 127.0.0.1 > /dev/null
          - -port=8080
          ports:
          - containerPort: 8080
            protocol: TCP
        volumes:
        - name: etcd-storage
          emptyDir: {}
        dnsPolicy: Default
        
```

#问题

##nodePort端口不通
    
    iptables -P FORWARD ACCEPT
    iptables -S -t filter
    
    https://github.com/kubernetes/kubernetes/issues/40182

##找不到证书问题

cd /etc/rhsm/ca/
vi redhat-uep.pem

```
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-----END CERTIFICATE-----
-----BEGIN CERTIFICATE-----
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-----BEGIN CERTIFICATE-----
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Yf3kQs4xzH4ZejhG9wzv8PGXOS8wHYnfVNA3+fclDEQ1mEBKWHHmenGI6QKZUP8f
g0SQ3PNRnSZu8R+rhABOEuVFIBRlaYijg2Pxe0NgL9FlHsNyRfo6EUrB2QFRKACW
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Kg6Ay0rrsi4nw1JHue2GvdjdfVOaWSWC
-----END CERTIFICATE-----
```

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