基于StatefulSet有状态部署与DaemonSet部署prometheus node-exporter
作者:互联网
statefulset有状态应用部署
考虑无状态的pod因素,让每个pod独立,保持pod启动顺序和唯一性。拥有唯一的网络标识符,持久存储。启动顺序有序,例如mysql主从节点
应用场景
为了解决有服务状态的集群部署、集群之间的数据同步问题(Mysql主从等)
稳定的持久化存储:Pod重新调度后访问相同的持久化数据,基于PVC来实现。
稳定的网络标志:Pod重新调度后PodName和HostName不变,基于Headless Service来实现。
有序扩展:在扩展的时候要依据定义的顺序依次依次进行,基于init containers 实现。在下一个Pod运行之前所有Pod必须是Running和Ready状态)。
有序删除,从后到前逐个删除pod。
组成部分
从上面的应用场景可以发现,StatefulSet由以下几个部分组成:
Headless Service,用于定义网络标志(DNS domain)的。
volumeClaimTemplates,用于创建PVC,指定pvc名称大小,pvc必须由存储类提供存储。为每个Pod生成不同的pvc,并绑定pv,从而实现各pod有专用存储。
StatefulSet,定义具体应用,与deployments类似。
deployment和statefulset区别:有身份(具有唯一标识符)
(1)根据主机名+按照一定规则生成域名
(2)每个pod拥有唯一的主机名
(3)唯一域名:格式:
(4)Pod主机名称.service名称.名称空间.svc.cluster.local
部署有状态服务:
声明svc取消ip地址的暴露,将clusterip置位None
root@deploy:/statefulset# kubectl create ns test
namespace/test created
root@deploy:/statefulset# vim statefulset.yaml
apiVersion: apps/v1
kind: StatefulSet
metadata:
name: web-statefulset
namespace: test
spec:
serviceName: test-statefulset
replicas: 2
selector:
matchLabels:
app: web
template:
metadata:
labels:
app: web
spec:
containers:
- image: nginx
name: nginx
ports:
- containerPort: 80
- name: tomcat
image: tomcat
ports:
- containerPort: 8080
---
apiVersion: v1
kind: Service
metadata:
labels:
app: web
name: test-statefulset
namespace: test
spec:
clusterIP: None
ports:
- port: 80
name: nginx
protocol: TCP
targetPort: 80
- port: 8080
protocol: TCP
targetPort: 8080
name: tomcat
selector:
app: web
root@deploy:/statefulset# kubectl apply -f statefulset.yaml
查看statefulset pod
root@deploy:/statefulset# kubectl get pods
NAME READY STATUS RESTARTS AGE
web-statefulset-0 2/2 Running 0 70s
web-statefulset-1 2/2 Running 0 38s
进入到pod测试网络和主机名称
#查看svc
root@deploy:/statefulset# kubectl get svc
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
test-statefulset ClusterIP None <none> 80/TCP,8080/TCP 8m33s
root@deploy:/statefulset# kubectl exec -it web-statefulset-0 -- bash
Defaulted container "nginx" out of: nginx, tomcat
root@web-statefulset-0:/# cat /etc/hosts
# Kubernetes-managed hosts file.
127.0.0.1 localhost
::1 localhost ip6-localhost ip6-loopback
fe00::0 ip6-localnet
fe00::0 ip6-mcastprefix
fe00::1 ip6-allnodes
fe00::2 ip6-allrouters
10.200.166.175 web-statefulset-0.test-statefulset.test.svc.cluster.local web-statefulset-0
使用其他namespace下的pod访问test 名称空间下的statefulset应用
root@master1:~# kubectl get pods -n default
NAME READY STATUS RESTARTS AGE
aliyun-web-deployment-668cb5f7b5-5rnqs 1/1 Running 1 (127m ago) 3d21h
aliyun-web-deployment-668cb5f7b5-sgs2g 1/1 Running 1 (127m ago) 3d21h
web-deployment-647db54fb5-fkggx 1/1 Running 1 (127m ago) 4d1h
web-deployment-647db54fb5-lz64s 1/1 Running 1 (127m ago) 4d1h
root@master1:~# kubectl exec -it -n default web-deployment-647db54fb5-lz64s -- curl test-statefulset.test
<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
<style>
html { color-scheme: light dark; }
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>
root@master1:~#
pod访问测试
root@web-statefulset-0:/usr/local/tomcat# curl web-statefulset-0.test-statefulset.test.svc.cluster.local
<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
<style>
html { color-scheme: light dark; }
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>
标签:node,web,StatefulSet,部署,nginx,statefulset,test,pod,root 来源: https://www.cnblogs.com/punchlinux/p/16561471.html