标签：
foo.default.svc.cluster.local
|service|
/ \
| pod-asdf | | pod-zxcv | *.foo.default.svc.cluster.local
| mysql-0 | <-> | mysql-1 |
[pv 0] [pv 1]# A headless service to create DNS records name: nginx
labels:
ports:
- port: 80
name: web
# *.nginx.default.svc.cluster.local
clusterIP: None
selector:
serviceName: "nginx"
replicas: 2
template:
metadata:
labels:
app: nginx
annotations:
pod.alpha.kubernetes.io/initialized: "true"
spec:
terminationGracePeriodSeconds: 0
containers:
- name: nginx
image: gcr.io/google_containers/nginx-slim:0.8
ports:
- containerPort: 80
name: web
volumeMounts:
- name: www
mountPath: /usr/share/nginx/html
volumeClaimTemplates:
- metadata:
name: www
annotations:
volume.alpha.kubernetes.io/storage-class: anything
spec:
accessModes: [ "ReadWriteOnce" ]
resources:
requests:
storage: 1Gi$ kubectl create -f petset.yaml
service "nginx" created
petset "nginx" created$ kubectl get po
NAME READY STATUS RESTARTS AGE
web-0 1/1 Running 0 10m
web-1 1/1 Running 0 10m$ kubectl get pv
NAME CAPACITY ACCESSMODES STATUS CLAIM REASON AGE
pvc-90234946-3717-11e6-a46e-42010af00002 1Gi RWO Bound default/www-web-0 11m
pvc-902733c2-3717-11e6-a46e-42010af00002 1Gi RWO Bound default/www-web-1 11m| Cluster Domain | Service (ns/name) | Pet Set (ns/name) | Pet Set Domain | Pet DNS | Pet Hostname |
|---|---|---|---|---|---|
| cluster.local | default/nginx | default/web | nginx.default.svc.cluster.local | web-{0..N-1}.nginx.default.svc.cluster.local | web-{0..N-1} |
| cluster.local | foo/nginx | foo/web | nginx.foo.svc.cluster.local | web-{0..N-1}.nginx.foo.svc.cluster.local | web-{0..N-1} |
| kube.local | foo/nginx | foo/web | nginx.foo.svc.kube.local | web-{0..N-1}.nginx.foo.svc.kube.local | web-{0..N-1} |
$ kubectl get svc
NAME CLUSTER-IP EXTERNAL-IP PORT(S) AGE
nginx None <none> 80/TCP 12m
...$ for i in 0 1; do kubectl exec web-$i -- sh -c ‘hostname‘; done
web-0
web-1$ kubectl run -i --tty --image busybox dns-test --restart=Never /bin/sh
dns-test # nslookup web-0.nginx
Server: 10.0.0.10
Address 1: 10.0.0.10 kube-dns.kube-system.svc.cluster.local
Name: web-0.nginx
Address 1: 10.180.3.5
dns-test # nslookup web-1.nginx
Server: 10.0.0.10
Address 1: 10.0.0.10 kube-dns.kube-system.svc.cluster.local
Name: web-1.nginx
Address 1: 10.180.0.9$ for i in 0 1; do
kubectl exec web-$i -- sh -c ‘echo $(hostname) > /usr/share/nginx/html/index.html‘;
$ for i in 0 1; do kubectl exec -it web-$i -- curl localhost; done
web-0
web-1$ kubectl delete po -l app=nginx
pod "web-0" deleted
pod "web-1" deleted$ kubectl exec -it web-1 -- curl web-0.nginx
web-0
$ kubectl exec -it web-0 -- curl web-1.nginx
web-1apt-get in a container）$ kubectl exec -it web-0 /bin/sh
web-0 # apt-get update && apt-get install -y dnsutils
...
web-0 # nslookup -type=srv nginx.default
Server: 10.0.0.10
Address: 10.0.0.10#53
nginx.default.svc.cluster.local service = 10 50 0 web-1.ub.default.svc.cluster.local.
nginx.default.svc.cluster.local service = 10 50 0 web-0.ub.default.svc.cluster.local.$ kubectl get po
NAME READY STATUS RESTARTS AGE
web-0 1/1 Running 0 30s
web-1 1/1 Running 0 36s
$ kubectl patch petset web -p ‘{"spec":{"replicas":3}}‘"web" patched
$ kubectl get po
NAME READY STATUS RESTARTS AGE
web-0 1/1 Running 0 40s
web-1 1/1 Running 0 46s
web-2 1/1 Running 0 8s$ kubectl delete -f petset.yaml
petset "web" deleted
$ kubectl get po -l app=nginx
NAME READY STATUS RESTARTS AGE
web-0 1/1 Running 0 21h
web-1 1/1 Running 0 21h
$ kubectl delete po -l app=nginx
pod "web-0" deleted
pod "web-1" deleted$ kubectl get po -l app=nginx
$ kubectl get pvc -l app=nginx
NAME STATUS VOLUME CAPACITY ACCESSMODES AGE
www-web-0 Bound pvc-62d271cd-3822-11e6-b1b7-42010af00002 0 21h
www-web-1 Bound pvc-62d6750e-3822-11e6-b1b7-42010af00002 0 21h
$ kubectl delete pvc -l app=nginx
$ kubectl get pv$ sleep $grace$ kubectl delete pvc -l app=nginxannotations:
pod.alpha.kubernetes.io/initialized: "true"标签：
原文地址：http://www.cnblogs.com/wofeiwofei/p/5856139.html
