Kubernetes的總體架構

部署環境說明

主機名	IP	操作系統	角色
node201 ? ? ?	10.0.0.201 ? ? ? ? ?	centos 7.3 64位 ? ? ?	Master
node202	10.0.0.202	centos 7.3 64位	Node
node203	10.0.0.203	centos 7.3 64位	Node

關閉防火墻或開通相關端口，測試環境部署推薦先關閉防火墻服務。

systemctl stop firewalld

systemctl disable firewalld

停止SELinux。

編輯文件/etc/selinux/config

容器引擎docker的部署

yum install docker，切記不要安裝docker-ce，kubernetes1.6.2目前不支持docker-ce.

部署etcd3

http://blog.csdn.net/chenhaifeng2016/article/details/71122886

跨主機容器間網絡通信采用flannel vxlan

http://blog.csdn.net/chenhaifeng2016/article/details/71480249

封包方式影響性能，不建議用于生產環境。如果對性能有要求，建議采用路由方案，比如calico。

部署Kubernetes

下載軟件包

wget?https://github.com/kubernetes/kubernetes/releases/download/v1.6.2/kubernetes.tar.gz

tar zxvf kubernetes.tar.gz

安裝軟件

cd kubernetes

./cluster/get-kube-binaries.sh

下載完成后，解壓server/kubernetes-server-linux-amd64.tar.gz

服務程序的完整路徑

/usr/local/src/kubernetes/server/kubernetes/server/bin/

定義kube-apiserver.service

[Unit] Description=Kube-apiserver Service After=network.target After=etcd.service After=docker.service After=flanneld.service[Service] Type=notify ExecStart=/usr/local/src/kubernetes/server/kubernetes/server/bin/kube-apiserver \--allow-privileged=true \--admission-control=NamespaceLifecycle,NamespaceExists,LimitRanger,SecurityContextDeny,ResourceQuota \--etcd-servers=http://10.0.0.201:2379,10.0.0.202:2379,10.0.0.203:2379 \--advertise-address=10.0.0.201 \--bind-address=10.0.0.201 \--insecure-bind-address=0.0.0.0 \--log-dir=/usr/local/src/kubernetes/log/kube-apiserver \--logtostderr=false \--service-cluster-ip-range=10.254.0.0/16 \--v=0Restart=on-failure LimitNOFILE=65536[Install] WantedBy=multi-user.target

定義kube-controller-manager.service

[Unit] Description=Kube-controller-manager Service After=network.target After=docker.service After=etcd.service After=flanneld.service[Service] ExecStart=/usr/local/src/kubernetes/server/kubernetes/server/bin/kube-controller-manager \--logtostderr=false \--log-dir=/usr/local/src/kubernetes/log/kube-controller-manager \--master=http://0.0.0.0:8080 \--service-cluster-ip-range=10.254.0.0/16 \--leader-elect=true \--v=0Restart=on-failure LimitNOFILE=65536[Install] WantedBy=multi-user.target

定義kube-scheduler.service

[Unit] Description=Kube-scheduler Service After=network.target After=docker.service After=etcd.service After=flanneld.service[Service] ExecStart=/usr/local/src/kubernetes/server/kubernetes/server/bin/kube-scheduler \--log-dir=/usr/local/src/kubernetes/log/kube-scheduler \--logtostderr=false \--master=http://0.0.0.0:8080 \--leader-elect=true \--v=0Restart=on-failure LimitNOFILE=65536[Install] WantedBy=multi-user.target

安裝以及運行服務

cp *.service /usr/lib/systemd/system/

systemctl daemon-reload

systemctl start kube-apiserver?kube-controller-manager kube-scheduler

systemctl status kube-apiserver?kube-controller-manager kube-scheduler

systemctl enable?kube-apiserver?kube-controller-manager kube-scheduler

配置Node (注意事項：不同的Node配置不同的IP地址)

節點node201不部署kubelet和kube-proxy.

創建kubelet.service

[Unit] Description=Kubelet Service After=network.target After=docker.service After=etcd.service After=flanneld.service[Service] ExecStart=/usr/local/src/kubernetes/server/kubernetes/server/bin/kubelet \--api-servers=http://10.0.0.201:8080 \--log-dir=/usr/local/src/kubernetes/log/kubelet \--logtostderr=false \--address=10.0.0.203 \--hostname-override=10.0.0.203 \--allow-privileged=true \--pod-infra-container-image=docker.io/wangyanbin/pause-amd64:3.0 \--v=0 \--cgroup-driver=systemdRestart=on-failure LimitNOFILE=65536[Install] WantedBy=multi-user.target

創建kube-proxy.service

[Unit] Description=Kube-proxy Service After=network.target After=docker.service After=etcd.service After=flanneld.service[Service] ExecStart=/usr/local/src/kubernetes/server/kubernetes/server/bin/kube-proxy \--log-dir=/usr/local/src/kubernetes/log/kube-proxy \--logtostderr=false \--master=http://10.0.0.201:8080 \--v=0 \--bind-address=10.0.0.203 \--hostname-override=10.0.0.203 \--cluster-cidr=10.254.0.0/16Restart=on-failure LimitNOFILE=65536[Install] WantedBy=multi-user.target
運行服務

cp *.service /usr/lib/systemd/system/

systemctl daemon-reload

systemctl start kubelet kube-proxy

systemctl status kubelet kube-proxy

systemctl enable kubelet kube-proxy

驗證結果

測試服務

kubectl run nginx --replicas=2 --labels="run=load-balancer-example" --image=nginx ?--port=80

kubectl expose deployment nginx --type=NodePort --name=example-service

kubectl describe svc example-service

訪問nginx

通過Node IP和Node Port訪問服務

curl 10.0.0.202:32360

curl 10.0.0.203:32360

通過Pod IP訪問服務

curl 172.30.73.2:80

curl 172.30.8.2:80

在kubernetes集群范圍內通過Service IP訪問服務。一個微服務對應一個虛擬的ServiceIP，這是一個很巧妙的設計。

curl 10.254.253.118:80 (只能在節點node202和node203運行，因為需要kube-proxy)

接下來部署kube-DNS, Ingress controller, WebUI Dashboard, heapster監控, prometheus監控，EFK日志, Helm等功能。

總結

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