kubernetes应用部署
http://blog.sina.com.cn/s/blog_6e05157f0102wqf1.html
一. 根据<kubernetes>安装kubernetes集群环境
二. 如果本地没有docker registry,要确保节点能访问互联网
三. 确保管理节点能够ssh访问所有minion节点
部署nginx应用
kubernetes应用部署
首先,我们用复制器启动一个2个备份的nginx-pod.然后在前面挂载Service,一个service只能被集群内部访问,一个能被集群外的节点访问.下面所有的命令都是在管理节点上面运行的.
一 、 部署nginx pod 和 复制器
配置文件如下：
[root@k8s-master ~]# cat nginx-rc.yaml
apiVersion: v1
kind: ReplicationController
metadata:
name: nginx-controller
spec:
replicas: 2
selector:
name: nginx
template:
metadata:
labels:
name: nginx
spec:
containers:
- name: nginx
image: nginx
ports:
- containerPort: 80
#nginx-rc.yaml定义了一个nginx pod复制器,复制人数为2,使用的是nginx docker镜像
创建nginx pod复制器:
[root@k8s-master ~]# kubectl create -f nginx-rc.yaml
replicationcontroller "nginx-controller" created
#由于kubernetes要去下载nginx镜像,所以创建pod时需要等待一些时间才能处理running状态
#查看pods状态
[root@k8s-master ~]# kubectl get pod
NAME READY STATUS RESTARTS AGE
nginx-controller-2emjo 1/1 Running 0 15m
nginx-controller-2zvdj 1/1 Running 0 15m
#查看pods详细状态
[root@k8s-master ~]# kubectl get pod -o wide
NAME READY STATUS RESTARTS AGE NODE
nginx-controller-2emjo 1/1 Running 0 16m 172.16.116.160
nginx-controller-2zvdj 1/1 Running 0 16m 172.16.116.161
二 、部署节点内部可访问的nginx service
Server的type有ClusterIP和 NodePort之分，缺少是ClusterIp，这种类型的service只能在集群内部访问
配置文件如下：
[root@k8s-master ~]# cat nginx-service-clusterip.yaml
apiVersion: v1
kind: Service
metadata:
name: nginx-service-clusterip
spec:
ports:
- port: 8001
targetPort: 80
protocol: TCP
selector:
name: nginx
#创建Service
[root@k8s-master ~]# kubectl create -f nginx-service-clusterip.yaml
service "nginx-service-clusterip" created
#查看Service状态
[root@k8s-master ~]# kubectl get service
NAME CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes 10.254.0.1 443/TCP 1d
nginx-service-clusterip 10.254.241.63 8001/TCP 23s
[root@k8s-master ~]# kubectl get service -o wide
NAME CLUSTER-IP EXTERNAL-IP PORT(S) AGE SELECTOR
kubernetes 10.254.0.1 443/TCP 1d
nginx-service-clusterip 10.254.241.63 8001/TCP 28s name=nginx
##通过查看Service状态可以获取Service ClusterIP是10.254.241.63，端口是8001
#验证nginx Cluster IP
curl -s 10.254.241.63:8001 注：在minion节点执行
[root@k8s-slave2 ~]# curl -s 10.254.241.63:8001
body {
width: 35em;
margin: 0 auto;
font-family: Tahoma, Verdana, Arial, sans-serif;
}
Welcome to nginx!
If you see this page, the nginx web server is successfully installed and
working. Further configuration is required.
For online documentation and support please refer to
nginx.org.
Commercial support is available at
nginx.com.
Thank you for using nginx.
三、部署外部可访问的nginx service
创建NodePort类型的Service,这种类型的Service在集群外部是可以访问
[root@k8s-master ~]# cat nginx-service-nodeport.yaml
apiVersion: v1
kind: Service
metadata:
name: nginx-service-nodeport
spec:
ports:
- port: 8000
targetPort: 80
protocol: TCP
type: NodePort
selector:
name: nginx
创建serverice
[root@k8s-master ~]# kubectl create -f nginx-service-nodeport.yaml
You have exposed your service on an external port on all nodes in your
cluster. If you want to expose this service to the external internet, you may
need to set up firewall rules for the service port(s) (tcp:32111) to serve traffic.
See http://releases.k8s.io/release-1.2/docs/user-guide/services-firewalls.md for more details.
service "nginx-service-nodeport" created
查看Service
[root@k8s-master ~]# kubectl get service
NAME CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes 10.254.0.1 443/TCP 1d
nginx-service-nodeport 10.254.116.49 nodes 8000/TCP 26s
[root@k8s-master ~]# kubectl get service -o wide
NAME CLUSTER-IP EXTERNAL-IP PORT(S) AGE SELECTOR
kubernetes 10.254.0.1 443/TCP 1d
nginx-service-nodeport 10.254.116.49 nodes 8000/TCP 1m name=nginx
[root@k8s-master ~]# kubectl describe service nginx-service-nodeport
Name: nginx-service-nodeport
Namespace: default
Labels:
Selector: name=nginx
Type: NodePort
IP: 10.254.116.49
Port: 8000/TCP
NodePort: 32111/TCP 注:Service节点级别端口是32111
Endpoints: 172.17.0.2:80,172.17.79.2:80
Session Affinity: None
No events.
验证Service可访问性
curl 10.254.116.49:32111
