1.创建一个deployment副本数为3，然后滚动更新镜像版本，并记录这个更新记录，最后再回滚到上一个版本
[root@k8s-master ~]# cat test.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
name: web
spec:
replicas: 3
revisionHistoryLimit: 5
strategy:
rollingUpdate:
maxSurge: 50%
maxUnavailable: 50%
type: RollingUpdate
selector:
matchLabels:
app: httpd
template:
metadata:
labels:
app: httpd
spec:
containers:
- name: httpd
image: xxkk/httpd:v1.0
imagePullPolicy: IfNotPresent
[root@k8s-master ~]# kubectl apply -f test.yaml
deployment.apps/web created
[root@k8s-master ~]# kubectl get pods
NAME READY STATUS RESTARTS AGE
web-76fd645644-2rlvx 1/1 Running 0 8s
web-76fd645644-4dsdr 1/1 Running 0 8s
web-76fd645644-97r6n 1/1 Running 0 8s
[root@k8s-master ~]# kubectl rollout history deployment/web
deployment.apps/web
REVISION CHANGE-CAUSE
1
[root@k8s-master ~]# vi test.yaml
......
containers:
- name: httpd
image: xxkk/httpd:v2.0 //更改镜像
imagePullPolicy: IfNotPresent
......
[root@k8s-master ~]# kubectl apply -f test.yaml
deployment.apps/web configured
[root@k8s-master ~]# kubectl get pods
NAME READY STATUS RESTARTS AGE
web-55fcc788f-ct5m6 1/1 Running 0 8m
web-55fcc788f-f4q4v 1/1 Running 0 8m
web-55fcc788f-h5zzt 1/1 Running 0 8m
# 回滚至版本1
[root@k8s-master ~]# kubectl rollout history deployment/web
deployment.apps/web
REVISION CHANGE-CAUSE
1
2
# 当前处于版本1，但是只使用了两个镜像，所以被覆盖，替换了。
[root@k8s-master ~]# kubectl rollout undo deployment/web --to-revision=1
deployment.apps/web rolled back
[root@k8s-master ~]# kubectl rollout history deployment/webdeployment.apps/web
REVISION CHANGE-CAUSE
2
3
2. 给一个应用扩容副本为4
[root@k8s-master ~]# vi test.yaml
[root@k8s-master ~]# cat test.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
name: web
spec:
replicas: 4 #修改为4
[root@k8s-master ~]# kubectl apply -f test.yaml
deployment.apps/web configured
[root@k8s-master ~]# kubectl get pods
NAME READY STATUS RESTARTS AGE
web-55fcc788f-7w9dp 1/1 Running 0 51s
web-55fcc788f-jj47k 1/1 Running 0 51s
web-55fcc788f-vhllq 1/1 Running 0 51s
web-55fcc788f-xw986 1/1 Running 0 51s
3.创建一个pod，其中运行着nginx、redis、mamcached 3个容器
[root@k8s-master ~]# vi test1.yaml
apiVersion: v1
kind: Pod
metadata:
name: test3
labels:
app: test3
spec:
containers:
- image: nginx
name: nginx
- image: redis
name: redis
- image: memcached
name: memcached
[root@k8s-master ~]# kubectl apply -f test1.yaml
pod/test3 created
[root@k8s-master ~]# kubectl get pod
NAME READY STATUS RESTARTS AGE
test3 3/3 Running 0 72s
4.给一个pod创建service，并可以通过ClusterIP/NodePort
[root@k8s-master ~]# vi hostwork.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
name: myapp-deploy
namespace: default
spec:
replicas: 1
selector:
matchLabels:
app: myapp
release: v1
template:
metadata:
labels:
app: myapp
release: v1
spec:
containers:
- name: myapp
image: xxkk/file_httpd:v0.2
imagePullPolicy: IfNotPresent
---
apiVersion: v1
kind: Service
metadata:
name: myapp-nodeport
namespace: default
spec:
type: NodePort
selector:
app: myapp
release: v1
ports:
- name: httpd
port: 80
targetPort: 80
nodePort: 31250
[root@k8s-master ~]# kubectl apply -f hostwork.yaml
deployment.apps/myapp-deploy created
service/myapp-nodeport configured
[root@k8s-master ~]# kubectl get pod,svc
NAME READY STATUS RESTARTS AGE
pod/myapp-deploy-5bc8b6987d-2lhfz 1/1 Running 0 69s
pod/web-55fcc788f-7w9dp 0/1 Terminating 0 4m50s
pod/web-55fcc788f-xw986 0/1 Terminating 0 4m50s
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
service/kubernetes ClusterIP 10.96.0.1 443/TCP 7d22h
service/myapp-nodeport NodePort 10.97.249.121 80:31250/TCP 43m
[root@k8s-master ~]# curl 10.97.249.121
It works!
[root@k8s-master ~]# curl 192.168.72.142:31250
It works!
5. 创建deployment和service，使用centos容器Nslookup解析service
[root@k8s-master ~]# cat hostwork.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
name: myapp-deploy
namespace: default
spec:
replicas: 1
selector:
matchLabels:
app: myapp
release: v1
template:
metadata:
labels:
app: myapp
release: v1
spec:
containers:
- name: myapp
image: xxkk/file_httpd:v0.2
imagePullPolicy: IfNotPresent
---
apiVersion: v1
kind: Service
metadata:
name: myapp-externalname
namespace: default
spec:
type: ExternalName
externalName: web.test.example.com
[root@k8s-master ~]# kubectl apply -f hostwork.yaml
deployment.apps/myapp-deploy created
service/myapp-externalname created
[root@k8s-master ~]# kubectl get pod,svc
NAME READY STATUS RESTARTS AGE
pod/myapp-deploy-5bc8b6987d-hnzjw 1/1 Running 0 102s
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
service/kubernetes ClusterIP 10.96.0.1 443/TCP 7d22h
service/myapp-externalname ExternalName web.test.example.com 102s
# 辨析一个busybox资源定义文件
[root@k8s-master ~]# cat busybox.yaml
apiVersion: v1
kind: Pod
metadata:
labels:
app: busybox-pod
name: test-busybox
spec:
containers:
- command:
- sleep
- "3600"
image: busybox
imagePullPolicy: Always
name: test-busybox
[root@k8s-master ~]# kubectl apply -f busybox.yaml
pod/test-busybox created
[root@k8s-master ~]# kubectl get pods
NAME READY STATUS RESTARTS AGE
myapp-deploy-5bc8b6987d-hnzjw 1/1 Running 0 3m56s
test-busybox 1/1 Running 0 26s
[root@k8s-master ~]# kubectl exec -it test-busybox /bin/sh
kubectl exec [POD] [COMMAND] is DEPRECATED and will be removed in a future version. Use kubectl exec [POD] -- [COMMAND] instead.
/ # nslookup myapp-externalname
Server: 10.96.0.10
Address: 10.96.0.10:53
** server can't find myapp-externalname.default.svc.cluster.local: NXDOMAIN
*** Can't find myapp-externalname.svc.cluster.local: No answer
*** Can't find myapp-externalname.cluster.local: No answer
*** Can't find myapp-externalname.localdomain: No answer
*** Can't find myapp-externalname.default.svc.cluster.local: No answer
*** Can't find myapp-externalname.svc.cluster.local: No answer
*** Can't find myapp-externalname.cluster.local: No answer
*** Can't find myapp-externalname.localdomain: No answer
