创建nginx-deploy.yaml 【上节课的内容】
apiVersion: apps/v1
kind: Deployment
metadata:
name: nginx-deploy
labels:
type: nginx-deploy
test: 1.0.0
namespace: default
spec:
replicas: 2 # 副本数
revisionHistoryLimit: 10 # 保留的历史版本数
selector: # 选择器
matchLabels:
app: nginx-deploy
test: 1.0.0
strategy: # 更新策略
type: RollingUpdate # 更新策略类型 RollingUpdate、Recreate
rollingUpdate:
maxUnavailable: 25% # 更新时最大不可用副本数
maxSurge: 25% # 更新时最大超出副本数
template: # 模板
metadata:
labels:
app: nginx-deploy
test: 1.0.0
spec:
containers:
- name: nginx
image: nginx:latest
imagePullPolicy: IfNotPresent
resources:
requests:
cpu: 50m
memory: 128Mi
limits:
cpu: 50m
memory: 128Mi
restartPolicy: Always # 重启策略
terminationGracePeriodSeconds: 30 # pod被删除时的等待时间
# 创建
kubectl create -f nginx-deploy.yaml创建nginx-svc.yaml 【上节课的内容】
apiVersion: v1
kind: Service
metadata:
name: nginx-svc
labels:
app: nginx
spec:
selector:
app: nginx-deploy
ports:
- port: 80
targetPort: 80
name: web
type: NodePort
# 创建
kubectl create -f nginx-svc.yaml
# 查看pod信息
get po -l app=nginx-deploy -o wide
# 结果
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
nginx-deploy-5666fcbb6b-6k8mw 1/1 Running 0 5m6s 10.244.107.241 k8s-node3 <none> <none>
nginx-deploy-5666fcbb6b-h2w4l 1/1 Running 0 5m6s 10.244.122.95 k8s-node4 <none> <none>
# 查看endpoint
kubectl get ep
#结果
kubernetes 192.168.10.100:6443 5d19h
nginx-svc 10.244.107.241:80,10.244.122.95:80 6m48s
通过服务名进行访问
# 创建其他的pod通过 service name进行访问（推荐）
kubectl exec -it dns-test -- sh
wget http://nginx-svc
# 通过服务名+命名空间
wget http://nginx-svc.default
代理k8s外部服务
1. 创建一个没有选择器的服务，不指定seletor；作用是内部访问外网
2. 自己创建endpoint
nginx-svc-external.yaml
apiVersion: v1
kind: Service
metadata:
name: nginx-svc-external
labels:
app: nginx
spec:
ports:
- port: 80
targetPort: 80
name: web
type: ClusterIP
# 部署
kubectl create -f nginx-svc-external.yaml
# 查看服务
[root@k8s-master services]# kubectl get svc
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 5d19h
nginx-svc NodePort 10.104.51.98 <none> 80:30539/TCP 20m
nginx-svc-external ClusterIP 10.103.145.219 <none> 80/TCP 7s
# endpoint
[root@k8s-master services]# kubectl get ep
NAME ENDPOINTS AGE
kubernetes 192.168.10.100:6443 5d19h
nginx-svc 10.244.107.241:80,10.244.122.95:80 20m
# 创建endpoint nginx-ep-external.yaml
apiVersion: v1
kind: Endpoints
metadata:
labels:
app: nginx # 与service一致
name: nginx-svc-external # 与service一致
namespace: default # 与service一致
subsets:
- addresses:
- ip: 120.78.159.117 #目标服务ip
ports:
- name: web
port: 80
protocol: TCP
# 创建+查看
[root@k8s-master services]# touch nginx-ep-external.yaml
[root@k8s-master services]# kubectl create -f nginx-ep-external.yaml
endpoints/nginx-svc-external created
[root@k8s-master services]# kubectl get ep
NAME ENDPOINTS AGE
kubernetes 192.168.10.100:6443 5d19h
nginx-svc 10.244.107.241:80,10.244.122.95:80 27m
nginx-svc-external 120.78.159.117:80 5s
# 测试访问
kubectl exec -it dns-test -- sh
wget http://nginx-svc-external
# 测试成功
/ # wget http://nginx-svc-external
Connecting to nginx-svc-external (10.103.145.219:80)
Connecting to www.wolfcode.cn (120.78.159.117:80)
Connecting to www.wolfcode.cn (120.78.159.117:443)
index.html 100% |***方向代理外部域名
创建一个service的配置文件
nginx-svc-domain.yaml
apiVersion: v1
kind: Service
metadata:
name: nginx-svc-domain
labels:
app: nginx-svc-domain
spec:
type: ExternalName
externalName: www.wolfcode.cn测试效果
# 进入终端
kubectl exec -it dns-test -- sh
# 删除之前的index.html
rm -rf index.html
# 测试
wget nginx-svc-domain
# 结果
wget wolfcode-svc-domain
wget: bad address 'wolfcode-svc-domain'
/ # wget nginx-svc-domain
Connecting to nginx-svc-domain (120.78.159.117:80)
Connecting to www.wolfcode.cn (120.78.159.117:80)
Connecting to www.wolfcode.cn (120.78.159.117:443)
index.html 100% ClusterIP
只能在集群内部使用，不配置的话默认就是 ClusterIP
ExternalName
返回定义的CNAME别名，可以配置为域名
NodePort
随机启动一个端口（30000-32767），映射到ports的端口，并且在每个node上都绑定改端口
可以固定写死一个端口
apiVersion: v1
kind: Service
metadata:
name: nginx-svc
labels:
app: nginx
spec:
selector:
app: nginx-deploy
ports:
- port: 80
targetPort: 80
name: web
nodePort: 32000 # 固定写死
type: NodePortLoadBalancer
云服务上的负载均衡服务
