如果對yaml不太熟悉，看這邊：https://blog.51cto.com/michaelkang/2429745
---
#配置deployment
kind: Deployment
apiVersion: extensions/v1beta1
metadata:
#設置dm名稱
name: dm-pttest
#添加標簽 pttest
labels:
app: pttest
spec:
# 通過replicas聲明pod個數是2
replicas: 2
# 通過標簽選擇被控制的pod
selector:
matchLabels:
app: pttest
# 在template中定義pod
template:
metadata:
# 給pod打上標簽app=pttest
labels:
app: pttest
spec:
containers:
# 聲明容器名稱，注意不是pod名稱，pod名稱應該定義在metadata中
- name: myapp
image: ikubernetes/myapp:v1
ports:
- containerPort: 80
---
#服務配置
apiVersion: v1
# 聲明一個Service資源對象
kind: Service
metadata:
#pod 名稱
name: svcpttest
labels:
app: pttest
annotations:
#檢查后端服務返回錯誤率，大于P，踢出集群
traefik.backend.circuitbreaker: NetworkErrorRatio() > 0.5
spec:
ports:
- name: http
port: 80
selector:
app: pttest
---
#配置ingress
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
name: myapp-traefik-ingress
annotations:
kubernetes.io/ingress.class: traefik
spec:
rules:
- host: pttest.pt.com
http:
paths:
- path: /
#指定后端服務
backend:
serviceName: svcpttest
servicePort: 80驗證服務
#查看服務
[root@kubm-02 traefik]# kubectl get svc -o wide
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE SELECTOR
svcpttest ClusterIP 10.245.148.114 <none> 80/TCP 2m12s app=pttest <==lable
#查看container
[root@kubm-02 traefik]# kubectl get pods -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
dm-pttest-6f6cd797f5-cdjk5 1/1 Running 0 63s 10.244.3.115 kubnode-01 <none> <none>
dm-pttest-6f6cd797f5-tqh64 1/1 Running 0 63s 10.244.4.135 kubnode-02 <none> <none>
#ingress 信息
[root@kubm-02 traefik]# kubectl get ingress
NAME HOSTS ADDRESS PORTS AGE
myapp-traefik-ingress pttest.pt.com 80 23s
#deployment
[root@kubm-02 traefik]# kubectl get deploy
NAME READY UP-TO-DATE AVAILABLE AGE
dm-pttest 2/2 2 2 12m驗證訪問：
請求pttest.pt.com，?服務svcpttest會把請求負載給后端的pod。
#請求兩次分別返回兩個
[root@kubm-02 traefik]# curl -H HOST:pttest.pt.com http://172.20.101.166/hostname.html
dm-pttest-6f6cd797f5-cdjk5
[root@kubm-02 traefik]# curl -H HOST:pttest.pt.com http://172.20.101.166/hostname.html
dm-pttest-6f6cd797f5-tqh64擴容節點
kubectl edit deployment dm-pttest
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
annotations:
deployment.kubernetes.io/revision: 1
creationTimestamp: 2019-08-16T10:13:49Z
generation: 1
labels:
app: pttest
name: dm-pttest
namespace: default
resourceVersion: 3871589
selfLink: /apis/extensions/v1beta1/namespaces/default/deployments/dm-pttest
uid: 153a60fb-66df-4884-aa9a-49ac47cebd2c
spec:
progressDeadlineSeconds: 2147483647
replicas: 5 《=====pod數量，有默認2個，調整到5個
保存退出，k8s集群會自動執行；驗證
kubectl get pods
[root@kubm-02 traefik]# kubectl get pods
NAME READY STATUS RESTARTS AGE
dm-pttest-6f6cd797f5-cdjk5 1/1 Running 0 17m
dm-pttest-6f6cd797f5-qd4cl 1/1 Running 0 99s
dm-pttest-6f6cd797f5-r25dc 1/1 Running 0 99s
dm-pttest-6f6cd797f5-tbfmh 1/1 Running 0 99s
dm-pttest-6f6cd797f5-tqh64 1/1 Running 0 17m
#請求
[root@kubm-02 traefik]# curl -H HOST:pttest.pt.com http://172.20.101.166/hostname.html
dm-pttest-6f6cd797f5-r25dc
[root@kubm-02 traefik]# curl -H HOST:pttest.pt.com http://172.20.101.166/hostname.html
dm-pttest-6f6cd797f5-tbfmh
[root@kubm-02 traefik]# curl -H HOST:pttest.pt.com http://172.20.101.166/hostname.html
dm-pttest-6f6cd797f5-tqh64
[root@kubm-02 traefik]# curl -H HOST:pttest.pt.com http://172.20.101.166/hostname.html
dm-pttest-6f6cd797f5-cdjk5
[root@kubm-02 traefik]# curl -H HOST:pttest.pt.com http://172.20.101.166/hostname.html
dm-pttest-6f6cd797f5-qd4cl
[root@kubm-02 traefik]# curl -H HOST:pttest.pt.com http://172.20.101.166/hostname.html
dm-pttest-6f6cd797f5-r25dc
[root@kubm-02 traefik]# curl -H HOST:pttest.pt.com http://172.20.101.166/hostname.html
dm-pttest-6f6cd797f5-tbfmh使用命令調整pod數量
調整pod數量為1；
kubectl scale deployment dm-pttest --replicas=1
調整pod數量為2；
kubectl scale deployment dm-pttest --replicas=2參考文檔
https://kubernetes.io/zh/docs/concepts/services-networking/connect-applications-service/
https://blog.csdn.net/u010606397/article/details/90752262
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