SundayHK

Kubernetes Ingress Helm 部署

2024-07-31 476 0

https://kubernetes.github.io/ingress-nginx/

Install

https://kubernetes.github.io/ingress-nginx/deploy/

helm repo add ingress-nginx  https://kubernetes.github.io/ingress-nginx 
helm search repo ingress-nginx
# helm pull ingress-nginx/ingress-nginx
helm pull ingress-nginx/ingress-nginx --version 4.10.3
tar xf ingress-nginx-4.10.3.tgz 
cd ingress-nginx

# 修改后
vim values.yaml

# 94行 false -> true
hostNetwork: true
# 73行 ClusterFirst -> ClusterFirstWithHostNet
dnsPolicy: ClusterFirstWithHostNet
# 204行 Deployment -> DaemonSet
kind: DaemonSet
# 466行 LoadBalancer -> ClusterIP 
type: ClusterIP

# 若指定在Master节点则需要设置标签和容忍
# 307、804、1000行 有3个 指定标签 
  nodeSelector:
    kubernetes.io/os: linux
    isIngress: "true"

打标签

kubectl label node k8s-master01 isIngress=true
kubectl label node k8s-master02 isIngress=true
kubectl label node k8s-master03 isIngress=true

容忍

[root@harbor ingress-nginx]# kubectl describe nodes k8s-master01 | grep Taints
Taints:             node-role.kubernetes.io/master:NoSchedule

# 229、806、982行 注意有多个tolerations，或者全加
  tolerations: 
    - key: ""  # 注 空字符
      operator: "Exists"
      effect: "NoSchedule"

修改镜像

registry: registry.k8s.io
修改为
registry.aliyuncs.com/google_containers

安装

helm install ingress-nginx -n ingress-nginx --create-namespace .

此时上面命令会卡住，直到创建完成就才释放
卡住时可以看下pod状态，如镜像拉取不下来

[root@harbor ingress-nginx]# kubectl get pod -n ingress-nginx
NAME                             READY   STATUS    RESTARTS   AGE
ingress-nginx-controller-n7l8m   1/1     Running   0          1m17s
ingress-nginx-controller-nrk4q   1/1     Running   0          1m17s
ingress-nginx-controller-t47ph   1/1     Running   0          1m17s

https://kubernetes.github.io/ingress-nginx/user-guide/nginx-configuration/annotations/

http proxy

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: nginx-demo
  namespace: default
spec:
  ingressClassName: nginx
  rules:
    - host: demo.sundayhk.com
      http:
        paths:
          - pathType: Prefix
            backend:
              service:
                name: nginx-demo
                port:
                  number: 80
            path: /

Annotations 即时更新 ConfigMap 一般需要手动更新

Redirect

https://kubernetes.github.io/ingress-nginx/user-guide/nginx-configuration/annotations/#permanent-redirect

nginx.ingress.kubernetes.io/permanent-redirect: https://www.baidu.com
nginx.ingress.kubernetes.io/permanent-redirect-code: '308'  # 可选，rancher ui不需加引号

Rewrite

https://kubernetes.github.io/ingress-nginx/examples/rewrite/

SSL

HOST=test.sundayhk.com
KEY_FILE=$HOST.key
CERT_FILE=$HOST.pem
CERT_NAME=$HOST
openssl req -x509 -nodes -days 365 -newkey rsa:2048 -keyout ${KEY_FILE} -out ${CERT_FILE} -subj "/CN=${HOST}/O=${HOST}"

kubectl create secret tls ${CERT_NAME} --key ${KEY_FILE} --cert ${CERT_FILE}
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: web-prod
  namespace: default
spec:
  ingressClassName: nginx
  rules:
  - host: web.sundayhk.com
    http:
      paths:
      - backend:
          service:
            name: web-prod
            port:
              number: 80
        path: /
        pathType: Prefix
  tls:
  - hosts:
    - web.sundayhk.com
    secretName: web.sundayhk.com

禁止http自动跳转https

nginx.ingress.kubernetes.io/ssl-redirect: "false"

ingress https直通 kubernetes-dashboard使用service ssl

#
nginx.ingress.kubernetes.io/ssl-passthrough: "true"

Limit

黑白名单：

  • Annotations: 只对指定的ingress生效
  • ConfigMap: 全局生效

configmap 默认为滚动升级不安全，设置为手动删除pod才生效 Ingress imagePolicy: OnDelete

白名单

whitelist-source-range

nginx.ingress.kubernetes.io/whitelist-source-range: 127.0.0.1,192.168.10.250

黑名单

server-snippet

单个域名ingress限制IP

nginx.ingress.kubernetes.io/server-snippet: deny 192.168.1.171; allow all;

所有域名ingress限制 在ingress-nginx configmap配置

block-cidrs

data:
  block-cidrs: ip/cidrs
kubectl edit configmap -n ingress-nginx ingress-nginx-controller 

# data 配置keys: values
apiVersion: v1
data:
  allow-snippet-annotations: "true"
  block-cidrs: 192.168.10.0/24

Rate-limiting

rate-limiting

Rewrite

rewrite

Cancary

Nginx Annotations 支持以下 4 种 Canary 规则：

  • nginx.ingress.kubernetes.io/canary-by-header：基于 Request Header 的流量切分，适用于灰度发布以及 A/B 测试。当 Request Header 设置为 always时，请求将会被一直发送到 Canary 版本；当 Request Header 设置为 never时，请求不会被发送到 Canary 入口；对于任何其他 Header 值，将忽略 Header，并通过优先级将请求与其他金丝雀规则进行优先级的比较。
  • nginx.ingress.kubernetes.io/canary-by-header-value：要匹配的 Request Header 的值，用于通知 Ingress 将请求路由到 Canary Ingress 中指定的服务。当 Request Header 设置为此值时，它将被路由到 Canary 入口。该规则允许用户自定义 Request Header 的值，必须与上一个 annotation (即：canary-by-header) 一起使用。
  • nginx.ingress.kubernetes.io/canary-weight：基于服务权重的流量切分，适用于蓝绿部署，权重范围 0 - 100 按百分比将请求路由到 Canary Ingress 中指定的服务。权重为 0 意味着该金丝雀规则不会向 Canary 入口的服务发送任何请求，权重为 100 意味着所有请求都将被发送到 Canary 入口。
  • nginx.ingress.kubernetes.io/canary-by-cookie：基于 cookie 的流量切分，适用于灰度发布与 A/B 测试。用于通知 Ingress 将请求路由到 Canary Ingress 中指定的服务的cookie。当 cookie 值设置为 always时，它将被路由到 Canary 入口；当 cookie 值设置为 never时，请求不会被发送到 Canary 入口；对于任何其他值，将忽略 cookie 并将请求与其他金丝雀规则进行优先级的比较。

注意：金丝雀规则按优先顺序进行如下排序：

canary-by-header - > canary-by-cookie - > canary-weight
nginx.ingress.kubernetes.io/canary    "true" or "false"
nginx.ingress.kubernetes.io/canary-by-header    string
nginx.ingress.kubernetes.io/canary-by-header-value    string
nginx.ingress.kubernetes.io/canary-by-header-pattern    string
nginx.ingress.kubernetes.io/canary-by-cookie    string
nginx.ingress.kubernetes.io/canary-weight    number

正式版本

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: web-prod
  namespace: default
spec:
  ingressClassName: nginx
  rules:
  - host: web.sundayhk.com
    http:
      paths:
      - backend:
          service:
            name: web-prod
            port:
              number: 80
        path: /
        pathType: Prefix

灰度版本

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: web-gray
  namespace: default
  annotations:
    nginx.ingress.kubernetes.io/canary: "true"
    nginx.ingress.kubernetes.io/canary-by-header: canary # value 自定义
    nginx.ingress.kubernetes.io/canary-by-header-value: "true" # value 自定义
spec:
  ingressClassName: nginx
  rules:
  - host: web.sundayhk.com
    http:
      paths:
      - backend:
          service:
            name: web-gray
            port:
              number: 80
        path: /
        pathType: Prefix

测试

curl http://web.sundayhk.com
hello web prod@!!!

curl -H "canary: true" http://web.sundayhk.com
hello web gray@xxx

阿里云 Nginx Ingress高级用法
Nginx Ingress异常问题排查

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