Ingress 应用
一 、Ingress测试示例
定义一个deployment
---
apiVersion: v1
kind: Service
metadata:
name: ingress-test
labels:
app: ingress-test
spec:
selector:
app: ingress-test
type: ClusterIP
ports:
- name: web
port: 80
protocol: TCP
---
apiVersion: apps/v1
kind: Deployment
metadata:
name: ingress-test
labels:
app: ingress-test
spec:
replicas: 1
selector:
matchLabels:
app: ingress-test
template:
metadata:
labels:
app: ingress-test
spec:
containers:
- name: nginx
image: nginx:1.15.2
imagePullPolicy: IfNotPresent
volumeMounts:
- name: tz-config
mountPath: /etc/localtime
readOnly: true
volumes:
- name: tz-config
hostPath:
path: /usr/share/zoneinfo/Asia/Shanghai
定义一个ingress
ingress-web.yaml
apiVersion: networking.k8s.io/v1beta1
kind: Ingress
metadata:
name: ingress-test
annotations:
kubernetes.io/ingressClass: "nginx"
spec:
rules:
- host: ingress.test.com
http:
paths:
- path: /
backend:
serviceName: ingress-test
servicePort: 80
创建完成后修改host文件，将ingress.test.com指向ingress-controller所在的node节点
访问ingress.test.com
二、Redirect
只需要添加一个annotation，就能将访问指向重定向的网址
apiVersion: networking.k8s.io/v1beta1
kind: Ingress
metadata:
name: ingress-test
annotations:
kubernetes.io/ingressClass: "nginx"
nginx.ingress.kubernetes.io/permanent-redirect: "https://www.baidu.com"
spec:
rules:
- host: ingress.test.com
http:
paths:
- path: /
backend:
serviceName: ingress-test
servicePort: 80
-
nginx.ingress.kubernetes.io/permanent-redirect：301跳转
这样访问页面会直接跳转到https://www.baidu.com
查看ingress-controller配置
cat nginx.conf | grep "end server ingress.test.com" -B 20 proxy_request_buffering on; proxy_http_version 1.1; proxy_cookie_domain off; proxy_cookie_path off; # In case of errors try the next upstream server before returning an error proxy_next_upstream error timeout; proxy_next_upstream_timeout 0; proxy_next_upstream_tries 3; return 301 https://www.baidu.com; proxy_pass http://upstream_balancer; proxy_redirect off; } } ## end server ingress.test.com
- 发现配置中有 return 301，跳转到百度去了
三、Rewrite
apiVersion: networking.k8s.io/v1beta1
kind: Ingress
metadata:
name: ingress-test
annotations:
kubernetes.io/ingressClass: "nginx"
nginx.ingress.kubernetes.io/rewrite-target: /$2
spec:
rules:
- host: ingress.test.com
http:
paths:
- path: /something(/|$)(.*)
backend:
serviceName: ingress-test
servicePort: 80
- 将xxx.com/something/xxx 重定向到 xxx.com/xxx
四、TLS/HTTPS
创建证书（自己的测试证书）
生成证书
# openssl req -x509 -nodes -days 365 -newkey rsa:2048 -keyout tls.key -out tls.cert -subj "/CN=test-tls.test.com/O=test-tls Generating a RSA private key .+++++ ......................................................................................+++++ writing new private key to 'tls.key' -----
创建secret
# kubectl create secret tls ca-cert --key tls.key --cert tls.cert
secret/ca-cert created
查看域名证书
# kubectl get secret NAME TYPE DATA AGE ca-cert kubernetes.io/tls 2 5s
创建ingress请求域名
ingress-tls.yaml
apiVersion: networking.k8s.io/v1beta1
kind: Ingress
metadata:
name: ingress-tls
annotations:
kubernetes.io/ingressClass: "nginx"
spec:
rules:
- host: ingresstls.test.com
http:
paths:
- path: /
backend:
serviceName: ingress-test
servicePort: 80
tls:
- hosts:
- ingresstls.test.com
secretName: ca-cert
# kubectl create -f ingress-tls.yaml
五、配置通用域名证书
如果要使得某个域名下的网址都使用同一个证书，可以配置一个默认的域名证书
创建secret
# kubectl create secret tls default-tls --key xxx.com.key --cert xxx.com.pem secret/default-tls created
修改ingress-controller
# kubectl get daemonset -n ingress-nginx
# kubectl edit daemonset ingress-nginx-controller -n ingress-nginx
....
- args:
- /nginx-ingress-controller
- --publish-service=$(POD_NAMESPACE)/ingress-nginx-controller
- --election-id=ingress-controller-leader
- --ingress-class=nginx
- --tcp-services-configmap=$(POD_NAMESPACE)/tcp-services
- --udp-services-configmap=$(POD_NAMESPACE)/udp-services
- --configmap=$(POD_NAMESPACE)/nginx-configuration
- --validating-webhook=:8443
- --validating-webhook-certificate=/usr/local/certificates/cert
- --validating-webhook-key=/usr/local/certificates/key
- --default-ssl-certificate=default/default-tls
....
创建ingress请求域名
ingress-default-tls.yaml
apiVersion: networking.k8s.io/v1beta1
kind: Ingress
metadata:
name: ingress-default-tls
annotations:
kubernetes.io/ingressClass: "nginx"
spec:
rules:
- host: ingresstls.xxxx.com
http:
paths:
- path: /
backend:
serviceName: ingress-test
servicePort: 80
tls:
- hosts:
- ingresstls.xxxxx.com
- 不用设置证书secret，会自动使用默认的证书
- tls 整个部分都能省略
访问
六、Kubernetes Dashboard使用证书
kubernetes dashboard会使用其自己生成的证书，但是浏览器等并不认可。可以使用机构颁发的证书替换其自带的证书
生成证书的secret
# kubectl create secret tls default-tls --key xxx.com.key --cert xxx.com.pem -n kubernetes-dashboard
查看
# kubectl get secret -n kubernetes-dashboard NAME TYPE DATA AGE dashboard-tls kubernetes.io/tls 2 81m # 查看生成的证书名称，在data中 # kubectl get secret dashboard-tls -n kubernetes-dashboard -oyaml
修改原本dashboard的deployment
# kubectl get deploy kubernetes-dashboard -n kubernetes-dashboard -o yaml
...
- args:
- --auto-generate-certificates=false
- --tls-key-file=tls.key
- --tls-cert-file=tls.crt
- --token-ttl=21600
...
volumeMounts:
- mountPath: /certs
name: kubernetes-dashboard-certs-new
...
volumes:
- name: kubernetes-dashboard-certs-new
secret:
defaultMode: 420
secretName: dashboard-tls
-
-
自己的证书挂载在 /certs目录下
-
新的证书就是生成
最终的kubernetes-dashboard.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
labels:
k8s-app: kubernetes-dashboard
name: kubernetes-dashboard
namespace: kubernetes-dashboard
spec:
replicas: 1
selector:
matchLabels:
k8s-app: kubernetes-dashboard
strategy:
rollingUpdate:
maxSurge: 25%
maxUnavailable: 25%
type: RollingUpdate
template:
metadata:
labels:
k8s-app: kubernetes-dashboard
spec:
containers:
- args:
- --auto-generate-certificates=false
- --tls-key-file=tls.key
- --tls-cert-file=tls.crt
- --token-ttl=21600
- --namespace=kubernetes-dashboard
image: kubernetesui/dashboard:v2.0.3
imagePullPolicy: IfNotPresent
livenessProbe:
failureThreshold: 3
httpGet:
path: /
port: 8443
scheme: HTTPS
initialDelaySeconds: 30
periodSeconds: 10
successThreshold: 1
timeoutSeconds: 30
name: kubernetes-dashboard
ports:
- containerPort: 8443
protocol: TCP
resources: {}
securityContext:
allowPrivilegeEscalation: false
readOnlyRootFilesystem: true
runAsGroup: 2001
runAsUser: 1001
volumeMounts:
- mountPath: /certs
name: kubernetes-dashboard-certs-new
- mountPath: /tmp
name: tmp-volume
serviceAccount: kubernetes-dashboard
serviceAccountName: kubernetes-dashboard
volumes:
- name: kubernetes-dashboard-certs-new
secret:
defaultMode: 420
secretName: dashboard-tls
- emptyDir: {}
name: tmp-volume
修改dashboard 的service，去掉原本的nodeport，type改为ClusterIP
spec:
ports:
- name: dashboard
port: 443
protocol: TCP
targetPort: 8443
selector:
k8s-app: kubernetes-dashboard
sessionAffinity: None
type: ClusterIP
最终的kubernetes-dashboard 的service
# kubectl get svc -n kubernetes-dashboard | grep kubernetes-dashboard kubernetes-dashboard ClusterIP 10.104.46.152 <none> 443/TCP 34d
为dashboard配置ingress域名
ingress-dashboar.yaml
apiVersion: networking.k8s.io/v1beta1
kind: Ingress
metadata:
name: ingress-dashboard
annotations:
kubernetes.io/ingressClass: "nginx"
nginx.ingress.kubernetes.io/ssl-passthrough: "true"
nginx.ingress.kubernetes.io/backend-protocol: "HTTPS"
spec:
rules:
- host: dashboard.xxxxxx.com
http:
paths:
- path: /
backend:
serviceName: kubernetes-dashboard
servicePort: 443
tls:
- hosts:
- dashboard.xxxx.com
secretName: dashboard-tls
-
-
nginx.ingress.kubernetes.io/backend-protocol：后端使用https通信
-
创建
# kubectl create -f ingress-dashboard.yaml -n kubernetes-dashboard
