5.6 Ingress Controller - Ingress + Letsencrypt

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2023-12-01

Ingress + Letsencrypt - 图1

申请 Domain Name

首先就是申请一个你要的网域, 这边网路上资源很多都可以查一下哪个网域商或是一些相关的建议, 这边我就先不去多做介绍了, 文章中会以 sam.nctu.me 来作范例

用 Letsencrypt 来签发凭证

这边我们用手动的把它先签下来, 上 Letsencrypt 去安装 certbot, 手动签的方式也可以参考签 letsencrpyt 凭证文章, 输入以下指令来签凭证

$ sudo certbot certonly --standalone sam.nctu.me

结果会如下方显示

IMPORTANT NOTES:
 - Congratulations! Your certificate and chain have been saved at:
   /etc/letsencrypt/live/sam.nctu.me/fullchain.pem
   Your key file has been saved at:
   /etc/letsencrypt/live/sam.nctu.me/privkey.pem
   Your cert will expire on 2017-12-15. To obtain a new or tweaked
   version of this certificate in the future, simply run certbot
   again. To non-interactively renew *all* of your certificates, run
   "certbot renew"
 - If you like Certbot, please consider supporting our work by:
   Donating to ISRG / Let's Encrypt:   https://letsencrypt.org/donate
   Donating to EFF:                    https://eff.org/donate-le

签好后会自动放在

/etc/letsencrypt/live/sam.nctu.me/

可以看到裡面的凭证, 权限必须是 root 才能看到这个资料夹的内容

# ls
cert.pem  chain.pem  fullchain.pem  privkey.pem  README

这样凭证就签完了

设置 Kubernetes Secret

将 fullchain.pem(因为使用 nginx controller) 与 privkey.pem 来建立 secret, 这之后会配置给 ingress 使用

$ kubectl create secret tls tls-certs --cert fullchain.pem --key privkey.pem

查看 secret

$ kubectl get secret
NAME                              TYPE                                  DATA      AGE
default-token-rtlbl               kubernetes.io/service-account-token   3         6d
tls-certs                         kubernetes.io/tls                     2         55m

以建立完成

建立 Ingress

我们先去建立一个 ingress 的 yaml 档, 来帮助我们 create ingress 并加入 tls 的设定
ingress.yaml

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: nginx-ingress
spec:
  tls:
    - hosts:
      - sam.nctu.me
      secretName: tls-certs
  rules:
  - host: sam.nctu.me
    http:
      paths:
        - backend:
            serviceName: phpmyadmin
            servicePort: 80

然后建立此 Ingress

$ kubectl create -f ingress.yaml

并查看

$ kubectl get ingress
NAME            HOSTS            ADDRESS   PORTS     AGE
nginx-ingress   sam.nctu.me             80, 443   1h

建立 default-backend

先建立一个 delfault, 如果试着用 ip 直接 request 或是没有设定过的 domain name, 会回传 404

default-backend.yaml

apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: default-http-backend
  labels:
    k8s-app: default-http-backend
  namespace: kube-system
spec:
  replicas: 1
  template:
    metadata:
      labels:
        k8s-app: default-http-backend
    spec:
      terminationGracePeriodSeconds: 60
      containers:
      - name: default-http-backend
        # Any image is permissable as long as:
        # 1. It serves a 404 page at /
        # 2. It serves 200 on a /healthz endpoint
        image: gcr.io/google_containers/defaultbackend:1.0
        livenessProbe:
          httpGet:
            path: /healthz
            port: 8080
            scheme: HTTP
          initialDelaySeconds: 30
          timeoutSeconds: 5
        ports:
        - containerPort: 8080
        resources:
          limits:
            cpu: 10m
            memory: 20Mi
          requests:
            cpu: 10m
            memory: 20Mi
---
apiVersion: v1
kind: Service
metadata:
  name: default-http-backend
  namespace: kube-system
  labels:
    k8s-app: default-http-backend
spec:
  ports:
  - port: 80
    targetPort: 8080
  selector:
    k8s-app: default-http-backend

$ kubectl create -f default-backend.yaml

建立 Ingress-Nginx-Controller

这边有个小坑, 在建立之前要先设置 RBAC 才会顺利建起来, 花了点时间才发现, 所以我们要先建立相关的 RBAC
ingress-controller-rbac.yaml

apiVersion: rbac.authorization.k8s.io/v1beta1
kind: ClusterRole
metadata:
  name: ingress
rules:
- apiGroups:
  - ""
  resources:
  - configmaps
  - secrets
  - services
  - endpoints
  - ingresses
  - nodes
  - pods
  verbs:
  - list
  - watch
- apiGroups:
  - "extensions"
  resources:
  - ingresses
  verbs:
  - get
  - list
  - watch
- apiGroups:
  - ""
  resources:
  - events
  - services
  verbs:
  - create
  - list
  - update
  - get
  - patch
- apiGroups:
  - "extensions"
  resources:
  - ingresses/status
  - ingresses
  verbs:
  - update
---
apiVersion: rbac.authorization.k8s.io/v1beta1
kind: Role
metadata:
  name: ingress-ns
  namespace: kube-system
rules:
- apiGroups:
  - ""
  resources:
  - pods
  verbs:
  - list
- apiGroups:
  - ""
  resources:
  - services
  verbs:
  - get
- apiGroups:
  - ""
  resources:
  - endpoints
  verbs:
  - get
  - create
  - update
---
apiVersion: rbac.authorization.k8s.io/v1beta1
kind: RoleBinding
metadata:
  name: ingress-ns-binding
  namespace: kube-system
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: Role
  name: ingress-ns
subjects:
  - kind: ServiceAccount
    name: ingress
    namespace: kube-system
---
apiVersion: rbac.authorization.k8s.io/v1beta1
kind: ClusterRoleBinding
metadata:
  name: ingress-binding
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: ingress
subjects:
  - kind: ServiceAccount
    name: ingress
    namespace: kube-system
---
apiVersion: v1
kind: ServiceAccount
metadata:
  name: ingress
  namespace: kube-system

$ kubectl create -f ingress-controller-rbac.yaml

之后就可以建立 Ingress-controller
nginx-ingress-daemonset.yaml

apiVersion: extensions/v1beta1
kind: DaemonSet
metadata:
  name: nginx-ingress-controller
  labels:
    k8s-app: nginx-ingress-controller
  namespace: kube-system
spec:
  template:
    metadata:
      labels:
        k8s-app: nginx-ingress-controller
    spec:
      # hostNetwork makes it possible to use ipv6 and to preserve the source IP correctly regardless of docker configuration
      # however, it is not a hard dependency of the nginx-ingress-controller itself and it may cause issues if port 10254 already is taken on the host
      # that said, since hostPort is broken on CNI (https://github.com/kubernetes/kubernetes/issues/31307) we have to use hostNetwork where CNI is used
      # like with kubeadm
      hostNetwork: true
      terminationGracePeriodSeconds: 60
      serviceAccountName: ingress
      containers:
      - image: gcr.io/google_containers/nginx-ingress-controller:0.9.0-beta.3
        name: nginx-ingress-controller
        readinessProbe:
          httpGet:
            path: /healthz
            port: 10254
            scheme: HTTP
        livenessProbe:
          httpGet:
            path: /healthz
            port: 10254
            scheme: HTTP
          initialDelaySeconds: 10
          timeoutSeconds: 1
        ports:
        - containerPort: 80
          hostPort: 80
        - containerPort: 443
          hostPort: 443
        env:
          - name: POD_NAME
            valueFrom:
              fieldRef:
                fieldPath: metadata.name
          - name: POD_NAMESPACE
            valueFrom:
              fieldRef:
                fieldPath: metadata.namespace
        args:
        - /nginx-ingress-controller
        - --default-backend-service=$(POD_NAMESPACE)/default-http-backend

$ kubectl create -f nginx-ingress-daemonset.yaml

查看是否有建立完成

$ kubectl get pod -n kube-system
nginx-ingress-controller-3q2b0           1/1       Running   0          1h
nginx-ingress-controller-j28sz           1/1       Running   0          1h
nginx-ingress-controller-lrn34           1/1       Running   0          1h

然后再测试直接输入 https://sam.nctu.tw 就行了, 当然这边只是测试, 记得换成你设定的 domain name

以上相關代碼放在 github