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kubernetes中的ingress-nginx

news 2024/10/27 20:37:15

华子目录

ingress-nginx
- ingress-nginx功能
部署ingress及使用
- - 注意
`ingress`的`高级用法`
- 1.基于路径的访问
- 2.基于域名的访问
- 3.建立tls加密
- 4.建立auth认证
- 5.rewrite重定向

ingress-nginx

官网：https://kubernetes.github.io/ingress-nginx/deploy/#bare-metal-clusters

ingress-nginx功能

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一种全局的、为了代理不同后端Service而设置的负载均衡服务，支持7层
Ingress由两部分组成：Ingress controller和Ingress服务
Ingress Controller会根据你定义的Ingress对象，提供对应的代理能力。
业界常用的各种反向代理项目，比如Nginx、HAProxy、Envoy、Traefik等，都已经为Kubernetes专门维护了对应的 Ingress Controller

[root@k8s-master services]# kubectl get pods
No resources found in default namespace.[root@k8s-master services]# kubectl create deployment huazi --image myapp:v1 --dry-run=client -o yaml > huazi-dp.yml[root@k8s-master services]# vim huazi-dp.yml
[root@k8s-master services]# cat huazi-dp.yml
apiVersion: apps/v1
kind: Deployment
metadata:labels:app: huaziname: huazi
spec:replicas: 1selector:matchLabels:app: huazitemplate:metadata:labels:app: huazispec:containers:- image: myapp:v1name: myapp#在克隆一份
[root@k8s-master services]# cp huazi-dp.yml huazi-dp1.yml
[root@k8s-master services]# vim huazi-dp1.yml
[root@k8s-master services]# cat huazi-dp1.yml
apiVersion: apps/v1
kind: Deployment
metadata:labels:app: huaname: hua
spec:replicas: 1selector:matchLabels:app: huatemplate:metadata:labels:app: huaspec:containers:- image: myapp:v2name: myapp

[root@k8s-master services]# kubectl apply -f huazi-dp.yml
deployment.apps/huazi created
[root@k8s-master services]# kubectl apply -f huazi-dp1.yml
deployment.apps/hua created

[root@k8s-master services]# kubectl expose deployment huazi --port 8080 --target-port 80 --dry-run=client -o yaml >> huazi-dp.yml
[root@k8s-master services]# kubectl expose deployment hua --port 8080 --target-port 80 --dry-run=client -o yaml >> huazi-dp1.yml

[root@k8s-master services]# vim huazi-dp.yml

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[root@k8s-master services]# vim huazi-dp1.yml

在这里插入图片描述

[root@k8s-master services]# kubectl apply -f huazi-dp.yml
deployment.apps/huazi unchanged
service/huazi created
[root@k8s-master services]# kubectl apply -f huazi-dp1.yml
deployment.apps/hua unchanged
service/hua created

[root@k8s-master services]# kubectl get pods -o wide --show-labels
NAME                     READY   STATUS    RESTARTS   AGE     IP           NODE            NOMINATED NODE   READINESS GATES   LABELS
hua-69554ffb96-b7z6t     1/1     Running   0          8m33s   10.244.2.6   k8s-node2.org   <none>           <none>            app=hua,pod-template-hash=69554ffb96
huazi-646d7864fd-w7rrz   1/1     Running   0          8m39s   10.244.2.5   k8s-node2.org   <none>           <none>            app=huazi,pod-template-hash=646d7864fd[root@k8s-master services]# kubectl get svc
NAME         TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)    AGE
hua          ClusterIP   10.96.56.127    <none>        8080/TCP   4m12s
huazi        ClusterIP   10.102.139.29   <none>        8080/TCP   4m25s
kubernetes   ClusterIP   10.96.0.1       <none>        443/TCP    20d[root@k8s-master services]# kubectl describe svc huazi
Name:              huazi
Namespace:         default
Labels:            app=huazi
Annotations:       <none>
Selector:          app=huazi
Type:              ClusterIP
IP Family Policy:  SingleStack
IP Families:       IPv4
IP:                10.102.139.29
IPs:               10.102.139.29
Port:              <unset>  8080/TCP
TargetPort:        80/TCP
Endpoints:         10.244.2.5:80
Session Affinity:  None
Events:            <none>[root@k8s-master services]# kubectl describe svc hua
Name:              hua
Namespace:         default
Labels:            app=hua
Annotations:       <none>
Selector:          app=hua
Type:              ClusterIP
IP Family Policy:  SingleStack
IP Families:       IPv4
IP:                10.96.56.127
IPs:               10.96.56.127
Port:              <unset>  8080/TCP
TargetPort:        80/TCP
Endpoints:         10.244.2.6:80
Session Affinity:  None
Events:            <none>

[root@k8s-master services]# curl 10.102.139.29:8080
Hello MyApp | Version: v1 | <a href="hostname.html">Pod Name</a>[root@k8s-master services]# curl 10.96.56.127:8080
Hello MyApp | Version: v2 | <a href="hostname.html">Pod Name</a>

现在只能在集群内部访问，可以利用ingress-nginx

部署ingress及使用

在这里插入图片描述

deploy.yaml上传到master中

[root@harbor ingress]# ls
deploy.yaml  ingress-nginx-1.11.2.tag.gz

[root@harbor ingress]# docker load -i ingress-nginx-1.11.2.tag.gz

在这里插入图片描述

[root@harbor ingress]# docker tag reg.timinglee.org/ingress-nginx/controller:v1.11.2   harbor.huazi.org/ingress-nginx/controller:v1.11.2
[root@harbor ingress]# docker tag reg.timinglee.org/ingress-nginx/kube-webhook-certgen:v1.4.3   harbor.huazi.org/ingress-nginx/kube-webhook-certgen:v1.4.3

上传镜像

[root@harbor ingress]# docker push harbor.huazi.org/ingress-nginx/controller:v1.11.2[root@harbor ingress]# docker push harbor.huazi.org/ingress-nginx/kube-webhook-certgen:v1.4.3

在这里插入图片描述

#修改配置文件中的image位置
[root@k8s-master services]# vim deploy.yaml

在这里插入图片描述

[root@k8s-master services]# kubectl apply -f deploy.yaml

[root@k8s-master services]# kubectl get namespaces

在这里插入图片描述

[root@k8s-master services]# kubectl -n ingress-nginx get pods
NAME                                       READY   STATUS      RESTARTS   AGE
ingress-nginx-admission-create-8bhdh       0/1     Completed   0          2m11s
ingress-nginx-admission-patch-8lwwn        0/1     Completed   2          2m11s
ingress-nginx-controller-bb7d8f97c-d7psv   1/1     Running     0          2m11s[root@k8s-master services]# kubectl -n ingress-nginx get all
NAME                                           READY   STATUS      RESTARTS   AGE
pod/ingress-nginx-admission-create-8bhdh       0/1     Completed   0          2m36s
pod/ingress-nginx-admission-patch-8lwwn        0/1     Completed   2          2m36s
pod/ingress-nginx-controller-bb7d8f97c-d7psv   1/1     Running     0          2m36sNAME                                         TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)                      AGE
service/ingress-nginx-controller             NodePort    10.102.168.161   <none>        80:32882/TCP,443:39565/TCP   2m36s
service/ingress-nginx-controller-admission   ClusterIP   10.97.9.224      <none>        443/TCP                      2m36sNAME                                       READY   UP-TO-DATE   AVAILABLE   AGE
deployment.apps/ingress-nginx-controller   1/1     1            1           2m36sNAME                                                 DESIRED   CURRENT   READY   AGE
replicaset.apps/ingress-nginx-controller-bb7d8f97c   1         1         1       2m36sNAME                                       STATUS     COMPLETIONS   DURATION   AGE
job.batch/ingress-nginx-admission-create   Complete   1/1           5s         2m36s
job.batch/ingress-nginx-admission-patch    Complete   1/1           20s        2m36s

[root@k8s-master services]# kubectl get svc
NAME         TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)    AGE
hua          ClusterIP   10.96.56.127    <none>        8080/TCP   28m
huazi        ClusterIP   10.102.139.29   <none>        8080/TCP   28m
kubernetes   ClusterIP   10.96.0.1       <none>        443/TCP    20d

在这里插入图片描述

[root@k8s-master services]# kubectl create ingress huazi --class nginx --rule='/=huazi:8080' --dry-run=client -o yaml > ingress1.yml[root@k8s-master services]# vim ingress1.yml
[root@k8s-master services]# cat ingress1.yml
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:name: huazi
spec:ingressClassName: nginxrules:- http:paths:- backend:service:name: huazi   #port:number: 8080   #path: /         #所有对于根路径的请求，将被转发到名为 `huazi` 的服务（`Service`）的 `8080` 端口上。pathType: Prefix

Exact（精确匹配），ImplementationSpecific（特定实现），Prefix（前缀匹配），Regular expression（正则表达式匹配）

kubectl create ingress huazi：这部分是命令的主体，表示要创建一个名为 huazi 的 Ingress 资源。
--class nginx：这个参数指定了 Ingress 控制器的类为 nginx。在 Kubernetes 中，Ingress 控制器可以有多种实现，如 nginx、traefik 等，这个参数就是用来指定使用哪种 Ingress控制器的。
--rule='/=huazi:8080'：这个参数定义了 Ingress规则。
- 这里的规则表示，对于所有匹配根路径（/）的请求，都将被转发到名为 huazi 的服务（Service）的 8080 端口上。
- 注意，这里的语法可能略有不同，通常我们看到的规则格式可能更接近于 --rule='/' - -service=huazi:8080 或者在 YAML 文件中以更详细的方式配置。

[root@k8s-master services]# kubectl -n ingress-nginx get all
NAME                                           READY   STATUS      RESTARTS   AGE
pod/ingress-nginx-admission-create-8bhdh       0/1     Completed   0          8m30s
pod/ingress-nginx-admission-patch-8lwwn        0/1     Completed   2          8m30s
pod/ingress-nginx-controller-bb7d8f97c-d7psv   1/1     Running     0          8m30sNAME                                         TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)                      AGE
service/ingress-nginx-controller             NodePort    10.102.168.161   <none>        80:32882/TCP,443:39565/TCP   8m30s
service/ingress-nginx-controller-admission   ClusterIP   10.97.9.224      <none>        443/TCP                      8m30sNAME                                       READY   UP-TO-DATE   AVAILABLE   AGE
deployment.apps/ingress-nginx-controller   1/1     1            1           8m30sNAME                                                 DESIRED   CURRENT   READY   AGE
replicaset.apps/ingress-nginx-controller-bb7d8f97c   1         1         1       8m30sNAME                                       STATUS     COMPLETIONS   DURATION   AGE
job.batch/ingress-nginx-admission-create   Complete   1/1           5s         8m30s
job.batch/ingress-nginx-admission-patch    Complete   1/1           20s        8m30s

修改微服务为LoadBalancer

[root@k8s-master services]# kubectl -n ingress-nginx edit svc ingress-nginx-controller

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[root@k8s-master services]# kubectl -n ingress-nginx get all
NAME                                           READY   STATUS      RESTARTS   AGE
pod/ingress-nginx-admission-create-8bhdh       0/1     Completed   0          11m
pod/ingress-nginx-admission-patch-8lwwn        0/1     Completed   2          11m
pod/ingress-nginx-controller-bb7d8f97c-d7psv   1/1     Running     0          11mNAME                                         TYPE           CLUSTER-IP       EXTERNAL-IP     PORT(S)                      AGE
service/ingress-nginx-controller             LoadBalancer   10.102.168.161   172.25.254.50   80:32882/TCP,443:39565/TCP   11m
service/ingress-nginx-controller-admission   ClusterIP      10.97.9.224      <none>          443/TCP                      11mNAME                                       READY   UP-TO-DATE   AVAILABLE   AGE
deployment.apps/ingress-nginx-controller   1/1     1            1           11mNAME                                                 DESIRED   CURRENT   READY   AGE
replicaset.apps/ingress-nginx-controller-bb7d8f97c   1         1         1       11mNAME                                       STATUS     COMPLETIONS   DURATION   AGE
job.batch/ingress-nginx-admission-create   Complete   1/1           5s         11m
job.batch/ingress-nginx-admission-patch    Complete   1/1           20s        11m

在这里插入图片描述

在ingress-nginx-controller中看到的对外IP就是ingress最终对外开放的ip

[root@k8s-master services]# kubectl apply -f ingress1.yml

[root@k8s-master services]# kubectl get ingress
NAME    CLASS   HOSTS   ADDRESS         PORTS   AGE
huazi   nginx   *       172.25.254.10   80      18m

[root@k8s-master services]# curl 172.25.254.50
Hello MyApp | Version: v1 | <a href="hostname.html">Pod Name</a>

注意

ingress必须和输出的service资源处于同一namespace

`ingress`的`高级用法`

1.基于路径的访问

建立用于测试的控制器myapp

[root@k8s-master services]# kubectl create deployment myapp-v1 --image myapp:v1 --dry-run=client -o yaml > myapp-v1.yaml
[root@k8s-master services]# kubectl create deployment myapp-v2 --image myapp:v2 --dry-run=client -o yaml > myapp-v2.yaml

[root@k8s-master services]# vim myapp-v1.yaml
[root@k8s-master services]# cat myapp-v1.yaml
apiVersion: apps/v1
kind: Deployment
metadata:labels:app: myapp-v1name: myapp-v1
spec:replicas: 1selector:matchLabels:app: myapp-v1template:metadata:labels:app: myapp-v1spec:containers:- image: myapp:v1name: myapp

[root@k8s-master services]# vim myapp-v2.yaml
[root@k8s-master services]# cat myapp-v2.yaml
apiVersion: apps/v1
kind: Deployment
metadata:labels:app: myapp-v2name: myapp-v2
spec:replicas: 1selector:matchLabels:app: myapp-v2template:metadata:labels:app: myapp-v2spec:containers:- image: myapp:v2name: myapp

[root@k8s-master services]# kubectl apply -f myapp-v1.yaml
deployment.apps/myapp-v1 created
[root@k8s-master services]# kubectl apply -f myapp-v2.yaml
deployment.apps/myapp-v2 created

[root@k8s-master services]# kubectl expose deployment myapp-v1 --port 80 --target-port 80 --dry-run=client -o yaml >> myapp-v1.yaml
[root@k8s-master services]# kubectl expose deployment myapp-v2 --port 80 --target-port 80 --dry-run=client -o yaml >> myapp-v2.yaml

[root@k8s-master services]# vim myapp-v1.yaml
[root@k8s-master services]# cat myapp-v1.yaml
apiVersion: apps/v1
kind: Deployment
metadata:labels:app: myapp-v1name: myapp-v1
spec:replicas: 1selector:matchLabels:app: myapp-v1template:metadata:labels:app: myapp-v1spec:containers:- image: myapp:v1name: myapp---
apiVersion: v1
kind: Service
metadata:labels:app: myapp-v1name: myapp-v1
spec:ports:- port: 80protocol: TCPtargetPort: 80selector:app: myapp-v1

[root@k8s-master services]# vim myapp-v2.yaml
[root@k8s-master services]# cat myapp-v2.yaml
apiVersion: apps/v1
kind: Deployment
metadata:labels:app: myapp-v2name: myapp-v2
spec:replicas: 1selector:matchLabels:app: myapp-v2template:metadata:labels:app: myapp-v2spec:containers:- image: myapp:v2name: myapp---
apiVersion: v1
kind: Service
metadata:labels:app: myapp-v2name: myapp-v2
spec:ports:- port: 80protocol: TCPtargetPort: 80selector:app: myapp-v2

[root@k8s-master services]# kubectl apply -f myapp-v1.yaml
deployment.apps/myapp-v1 unchanged
service/myapp-v1 created
[root@k8s-master services]# kubectl apply -f myapp-v2.yaml
deployment.apps/myapp-v2 unchanged
service/myapp-v2 created

[root@k8s-master services]# kubectl get pods -o wide
NAME                        READY   STATUS    RESTARTS   AGE     IP           NODE            NOMINATED NODE   READINESS GATES
myapp-v1-7479d6c54d-m7tcj   1/1     Running   0          6m19s   10.244.2.4   k8s-node2.org   <none>           <none>
myapp-v2-7cd6d597d-t2sd5    1/1     Running   0          6m12s   10.244.2.5   k8s-node2.org   <none>           <none>[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   23d
myapp-v1     ClusterIP   10.111.141.57   <none>        80/TCP    85s
myapp-v2     ClusterIP   10.103.170.42   <none>        80/TCP    79s

建立ingress1.yaml文件

[root@k8s-master services]# vim ingress1.yml
[root@k8s-master services]# cat ingress1.yml
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:annotations:nginx.ingress.kubernetes.io/rewrite-target: /    #访问路径后加任何内容都被定向到/name: ingress1
spec:ingressClassName: nginxrules:- host: www.huazi.comhttp:paths:- backend:   # ingress只能在一个文件中写，这里我们写两个backendservice:name: myapp-v1port:number: 80path: /v1pathType: Prefix- backend:service:name: myapp-v2port:number: 80path: /v2pathType: Prefix

[root@k8s-master services]# kubectl apply -f ingress1.yml
ingress.networking.k8s.io/ingress1 created

[root@k8s-master services]# vim /etc/hosts

在这里插入图片描述

[root@k8s-master services]# kubectl -n ingress-nginx get svc
NAME                                 TYPE           CLUSTER-IP       EXTERNAL-IP     PORT(S)                      AGE
ingress-nginx-controller             LoadBalancer   10.102.168.161   172.25.254.50   80:32882/TCP,443:39565/TCP   2d3h
ingress-nginx-controller-admission   ClusterIP      10.97.9.224      <none>          443/TCP                      2d3h

[root@k8s-master services]# kubectl get ingress
NAME       CLASS   HOSTS           ADDRESS   PORTS   AGE
ingress1   nginx   www.huazi.com             80      18s

测试

[root@k8s-master services]# curl www.huazi.com/v1
Hello MyApp | Version: v1 | <a href="hostname.html">Pod Name</a>
[root@k8s-master services]# curl www.huazi.com/v2
Hello MyApp | Version: v2 | <a href="hostname.html">Pod Name</a>

#nginx.ingress.kubernetes.io/rewrite-target: / 的功能实现
[root@k8s-master services]# curl www.huazi.com/v1/gagdasghg
Hello MyApp | Version: v1 | <a href="hostname.html">Pod Name</a>
[root@k8s-master services]# curl www.huazi.com/v2/gagdasghg
Hello MyApp | Version: v2 | <a href="hostname.html">Pod Name</a>

2.基于域名的访问

在测试主机中设定解析

[root@k8s-master services]# vim /etc/hosts

在这里插入图片描述

建立基于域名的yaml文件

[root@k8s-master services]# vim ingress2.yml
[root@k8s-master services]# cat ingress2.yml
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:annotations:nginx.ingress.kubernetes.io/rewrite-target: /name: ingress2
spec:ingressClassName: nginxrules:- host: myappv1.huazi.com   #第一个域名http:paths:- backend:service:name: myapp-v1port:number: 80path: /pathType: Prefix- host: myappv2.huazi.com  #第二个域名http:paths:- backend:service:name: myapp-v2port:number: 80path: /pathType: Prefix

[root@k8s-master services]# kubectl apply -f ingress2.yml
ingress.networking.k8s.io/ingress2 created

[root@k8s-master services]# kubectl describe ingress ingress2
Name:             ingress2
Labels:           <none>
Namespace:        default
Address:          172.25.254.10
Ingress Class:    nginx
Default backend:  <default>
Rules:Host               Path  Backends----               ----  --------myappv1.huazi.com/   myapp-v1:80 (10.244.2.4:80)myappv2.huazi.com/   myapp-v2:80 (10.244.2.5:80)
Annotations:         nginx.ingress.kubernetes.io/rewrite-target: /
Events:Type    Reason  Age                From                      Message----    ------  ----               ----                      -------Normal  Sync    31s (x2 over 37s)  nginx-ingress-controller  Scheduled for sync[root@k8s-master services]# kubectl get ingress
NAME       CLASS   HOSTS                                 ADDRESS         PORTS   AGE
ingress1   nginx   www.huazi.com                         172.25.254.10   80      17m
ingress2   nginx   myappv1.huazi.com,myappv2.huazi.com   172.25.254.10   80      98s

测试

[root@k8s-master services]# curl myappv1.huazi.com
Hello MyApp | Version: v1 | <a href="hostname.html">Pod Name</a>
[root@k8s-master services]# curl myappv2.huazi.com
Hello MyApp | Version: v2 | <a href="hostname.html">Pod Name</a>

3.建立tls加密

建立证书

[root@k8s-master services]# openssl req -newkey rsa:2048 -nodes -keyout tls.key -x509 -days 365 -subj "/CN=nginxsvc/O=nginxsvc" -out tls.crt

建立加密资源类型secret
- secret通常在kubernetes中存放敏感数据，他并不是一种加密方式

[root@k8s-master services]# kubectl create secret tls web-tls-secret --key tls.key --cert tls.crt
secret/web-tls-secret created

建立基于tls认证的ingress3.yml文件

[root@k8s-master services]# vim ingress3.yml
[root@k8s-master services]# cat ingress3.yml
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:annotations:nginx.ingress.kubernetes.io/rewrite-target: /name: ingress3
spec:tls:- hosts:- myapp-tls.huazi.comsecretName: web-tls-secretingressClassName: nginxrules:- host: myapp-tls.huazi.comhttp:paths:- backend:service:name: myapp-v1port:number: 80path: /pathType: Prefix

[root@k8s-master services]# kubectl apply -f ingress3.yml
ingress.networking.k8s.io/ingress3 created

测试

[root@k8s-master services]# kubectl describe ingress ingress3
Name:             ingress3
Labels:           <none>
Namespace:        default
Address:          172.25.254.10
Ingress Class:    nginx
Default backend:  <default>
TLS:web-tls-secret terminates myapp-tls.huazi.com
Rules:Host                 Path  Backends----                 ----  --------myapp-tls.huazi.com/   myapp-v1:80 (10.244.2.4:80)
Annotations:           nginx.ingress.kubernetes.io/rewrite-target: /
Events:Type    Reason  Age                    From                      Message----    ------  ----                   ----                      -------Normal  Sync    4m18s (x2 over 4m46s)  nginx-ingress-controller  Scheduled for sync

[root@k8s-master services]# curl -k https://myapp-tls.huazi.com
Hello MyApp | Version: v1 | <a href="hostname.html">Pod Name</a>

4.建立auth认证

5.rewrite重定向

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ingress-nginx

ingress-nginx功能

部署ingress及使用

注意

ingress的高级用法

1.基于路径的访问

2.基于域名的访问

3.建立tls加密

4.建立auth认证

5.rewrite重定向

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`ingress`的`高级用法`