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【容器技术】k8s部署nginx集群

2017-03-03 17:14 671 查看

环境：

两台虚拟机，

10.10.20.203 部署docker、etcd、flannel、kube-apiserver、kube-controller-manager、kube-scheduler

10.10.20.206 部署docker、flannel、kubelet、kube-proxy

1、创建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

2、创建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

3、创建pod

kubectl create -f nginx-rc.yaml

4、创建service

kubectl create -f nginx-service-nodeport.yaml

5、查看pod

[root@k8s-master ~]# kubectl get pods
NAME                     READY     STATUS    RESTARTS   AGE
nginx-controller-v40nj   1/1       Running   1          1h
nginx-controller-zxdzh   1/1       Running   1          1h

[root@k8s-master ~]# kubectl describe pod nginx-controller-v40nj
Name:        nginx-controller-v40nj
Namespace:    default
Node:        k8s-slave1-206/60.19.29.21
Start Time:    Thu, 11 Aug 2016 19:02:20 -0700
Labels:        name=nginx
Status:        Running
IP:        10.0.83.3
Controllers:    ReplicationController/nginx-controller
Containers:
nginx:
Container ID:        docker://269adc9b693aba0356ba18e4253c2b498fc7b7a8ce0af83857fcfd6b70e6ef03
Image:            nginx
Image ID:            docker://sha256:0d409d33b27e47423b049f7f863faa08655a8c901749c2b25b93ca67d01a470d
Port:            80/TCP
State:            Running
Started:            Thu, 11 Aug 2016 20:49:27 -0700
Last State:            Terminated
Reason:            Completed
Exit Code:        0
Started:            Thu, 11 Aug 2016 19:03:44 -0700
Finished:            Thu, 11 Aug 2016 20:12:12 -0700
Ready:            True
Restart Count:        1
Environment Variables:    <none>
Conditions:
Type        Status
Initialized     True
Ready     True
PodScheduled     True
No volumes.
QoS Tier:    BestEffort
Events:
FirstSeen    LastSeen    Count    From                SubobjectPath        Type        Reason    Message
---------    --------    -----    ----                -------------        --------    ------    -------
5m        5m        1    {kubelet k8s-slave1-206}    spec.containers{nginx}    Normal        Pulling    pulling image "nginx"
5m        5m        2    {kubelet k8s-slave1-206}                Warning        MissingClusterDNS    kubelet does not have ClusterDNS IP configured and cannot create Pod using "ClusterFirst" policy. Falling back to DNSDefault policy.
5m        5m        1    {kubelet k8s-slave1-206}    spec.containers{nginx}    Normal        Pulled    Successfully pulled image "nginx"
5m        5m        1    {kubelet k8s-slave1-206}    spec.containers{nginx}    Normal        Created    Created container with docker id 269adc9b693a
5m        5m        1    {kubelet k8s-slave1-206}    spec.containers{nginx}    Normal        Started    Started container with docker id 269adc9b693a

6、查看service

[root@k8s-master ~]# kubectl get service
NAME                     CLUSTER-IP     EXTERNAL-IP   PORT(S)    AGE
kubernetes               10.254.0.1     <none>        443/TCP    16h
nginx-service-nodeport   10.254.29.72   <nodes>       8000/TCP   49m

[root@k8s-master ~]# kubectl describe service nginx-service-nodeport
Name:            nginx-service-nodeport
Namespace:        default
Labels:            <none>
Selector:        name=nginx
Type:            NodePort
IP:            10.254.29.72
Port:            <unset>    8000/TCP
NodePort:        <unset>    31152/TCP
Endpoints:        10.0.83.2:80,10.0.83.3:80
Session Affinity:    None
No events.

7、测试service是否好用

因为service使用的是NodePort方式，所以在任何一个节点访问31152这个端口都可以访问nginx

$ curl 10.10.20.203:31152
<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
<style>
body {
width: 35em;
margin: 0 auto;
font-family: Tahoma, Verdana, Arial, sans-serif;
}
</style>
</head>
<body>
<h1>Welcome to nginx!</h1>
<p>If you see this page, the nginx web server is successfully installed and
working. Further configuration is required.</p>

<p>For online documentation and support please refer to
<a href="http://nginx.org/">nginx.org</a>.<br/>
Commercial support is available at
<a href="http://nginx.com/">nginx.com</a>.</p>

<p><em>Thank you for using nginx.</em></p>
</body>
</html>

$ curl 10.10.20.206:31152
<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
<style>
body {
width: 35em;
margin: 0 auto;
font-family: Tahoma, Verdana, Arial, sans-serif;
}
</style>
</head>
<body>
<h1>Welcome to nginx!</h1>
<p>If you see this page, the nginx web server is successfully installed and
working. Further configuration is required.</p>

<p>For online documentation and support please refer to
<a href="http://nginx.org/">nginx.org</a>.<br/>
Commercial support is available at
<a href="http://nginx.com/">nginx.com</a>.</p>

<p><em>Thank you for using nginx.</em></p>
</body>
</html>

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