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K8s集群中部署SpringCloud在线购物平台(一)

一、安装k8s高可用集群

主机名 IP 配置 网络
master控制节点 192.168.10.10 centos 7.9 4核4G 桥接
node1工作节点 192.168.10.11 centos 7.9 2核2G 桥接

 

 

 

 

初始化环境步骤到：

https://www.cnblogs.com/yangmeichong/p/16452316.html

docker镜像加速文件

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cat > /etc/docker/daemon.json <<EOF
{
"registry-mirrors":["https://pft7f97f.mirror.aliyuncs.com","https://rsbud4vc.mirror.aliyuncs.com","https://registry.docker-cn.com","https://docker.mirrors.ustc.edu.cn","https://dockerhub.azk8s.cn","http://hub-mirror.c.163.com","http://qtid6917.mirror.aliyuncs.com", "https://rncxm540.mirror.aliyuncs.com"], 
"exec-opts":["native.cgroupdriver=systemd"],
"log-driver":"json-file",
"log-opts": {
 "max-size": "100m"
 },
"storage-driver":"overlay2",
"storage-opts": [
 "overlay2.override_kernel_check=true"
 ]
}
EOF

systemctl daemon-reload && systemctl restart docker && systemctl status docker
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k8s如果是离线安装：

https://github.com/kubernetes/kubernetes  选择对应下载的版本导入镜像，然后使用kubeadm init安装

calico镜像：

Search · Quay需要calico-cni和calico-node,也可以去github下载 calico，以及calicao.yaml

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[root@master ~]# kubectl get nodes
NAME     STATUS     ROLES                  AGE   VERSION
master   Ready      control-plane,master   12d   v1.20.7
node1    Ready      worker                 12d   v1.20.7

[root@master calico]# kubectl get cs
Warning: v1 ComponentStatus is deprecated in v1.19+
NAME                 STATUS      MESSAGE                                                                                       ERROR
controller-manager   Unhealthy   Get "http://127.0.0.1:10252/healthz": dial tcp 127.0.0.1:10252: connect: connection refused   
scheduler            Unhealthy   Get "http://127.0.0.1:10251/healthz": dial tcp 127.0.0.1:10251: connect: connection refused   
etcd-0               Healthy     {"health":"true"}
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看到 cotroller-manager 和 scheduler 是 Unhealthy，按如下方面解决：

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vim /etc/kubernetes/manifests/kube-scheduler.yaml
修改如下内容：
把--bind-address=127.0.0.1 变成--bind-address=192.168.10.10
把—port=0 删除

vim /etc/kubernetes/manifests/kube-controller-manager.yaml
修改如下内容：
把--bind-address=127.0.0.1 变成--bind-address=192.168.10.10
把—port=0 删除


修改之后在 k8s 各个节点执行
systemctl restart kubelet
[root@master calico]# kubectl get cs
Warning: v1 ComponentStatus is deprecated in v1.19+
NAME                 STATUS    MESSAGE             ERROR
scheduler            Healthy   ok                  
controller-manager   Healthy   ok                  
etcd-0               Healthy   {"health":"true"}
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二、Ingress 和 Ingress Controller(七层)概述

2.1 回顾四层负载均衡器Service

（1）Pod漂移问题

        Kubernetes 具有强大的副本控制能力，能保证在任意副本（Pod）挂掉时自动从其他机器启动一个新的，还可以动态扩容等，通俗地说，这个 Pod 可能在任何时刻出现在任何节点上，也可能在任何时刻死在任何节点上；那么自然随着 Pod 的创建和销毁，Pod IP 肯定会动态变化；那么如何把这个动态的 Pod IP 暴露出去？

        这里借助于 Kubernetes 的 Service 机制，Service 可以以标签的形式选定一组带有指定标签的 Pod，并监控和自动负载他们的 Pod IP，那么我们向外暴露只暴露 Service IP 就行了；这就是 NodePort 模式：即在每个节点上开起一个端口，然后转发到内部 Pod IP 上，如下图所示

此时的访问方式：http://nodeip:nodeport/ ，即数据包流向如下：

客户端请求-->node 节点的 ip:端口--->service 的 ip:端口--->pod 的 ip:端口

 

 （2）端口管理问题

采用 NodePort 方式暴露服务面临的问题是，服务一旦多起来，NodePort 在每个节点上开启的端口会及其庞大，而且难以维护；这时，我们能否使用一个 Nginx 直接对内进行转发呢？

众所周知的是，Pod 与 Pod 之间是可以互相通信的，而 Pod 是可以共享宿主机的网络名称空间的，也就是说当在共享网络名称 空间时，Pod 上所监听的就是 Node 上的端口。那么这又该如何实现呢？

简单的实现就是使用 DaemonSet 在每个 Node 上监听 80，然后写好规则，因为 Nginx 外面绑定了宿主机 80 端口（就像 NodePort），本身又在集群内，那么向后直接转发到相应 Service IP 就行了，

如下图所示：

 

 （3）域名分配及动态更新问题

从上面的方法，采用 Nginx-Pod 似乎已经解决了问题，但是其实这里面有一个很大缺陷：当每次有新服务加入又该如何修改 Nginx 配置呢？

       我们知道使用 Nginx 可以通过虚拟主机域名进行区分不同的服务， 而每个服务通过 upstream 进行定义不同的负载均衡池，再加上 location 进行负载均衡的反向代理，在 日常使用中只需要修改 nginx.conf 即可实现，那在 K8S 中又该如何实现这种方式的调度呢？

假设后端的 服务初始服务只有 ecshop，后面增加了 bbs 和 member 服务，那么又该如何将这 2 个服务加入到 Nginx-Pod 进行调度呢？

总不能每次手动改或者 Rolling Update 前端 Nginx Pod 吧！此时 Ingress 出 现了，如果不算上面的 Nginx，Ingress 包含两大组件：Ingress Controller 和 Ingress。

 2.2 Ingress介绍

Ingress官网定义:Ingress可以把进入到集群内部的请求转发到集群中的一些服务上，从而可以把服务映射到集群外部。Ingress能把集群内Service 配置成外网能够访问的URL，流量负载均衡，提供基于域名访问的虚拟主机等。

Ingress 简单的理解就是你原来需要改 Nginx 配置，然后配置各种域名对应哪个 Service，现在把这个动作抽象出来，变成一个 Ingress对象，你可以用 yaml 创建，每次不要去改 Nginx 了，直接改 yaml 然后创建/更新就行了；那么问题来了：”Nginx 该怎么处理？”

Ingress Controller 这东西就是解决 “Nginx 的处理方式” 的；Ingress Controller 通过与 Kubernetes API 交互，动态的去感知集群中 Ingress 规则变化，然后读取他，按照他自己模板生成一段 Nginx 配置，再写到 Nginx Pod 里，最后 reload 一下，工作流程如下图：

 

        实际上 Ingress 也是 Kubernetes API 的标准资源类型之一，它其实就是一组基于 DNS 名称（host）或 URL 路径把请求转发到指定的 Service 资源的规则。用于将集群外部的请求流量转发到集群内部完成的服务发布。我们需要明白的是，Ingress 资源自身不能进行“流量穿透”，仅仅是一组规则的集合，这些集合规则还需要其他功能的辅助，比如监听某套接字，然后根据这些规则的匹配进行路由转发，这些能够为 Ingress 资源监听套接字并将流量转发的组件就是 Ingress Controller。

注：Ingress 控制器不同于 Deployment 控制器的是，Ingress 控制器不直接运行为 kube-controller-manager 的一部分，它仅仅是 Kubernetes 集群的一个附件，类似于 CoreDNS，需要在集群上单独部署。

2.3 Ingress Controller概述

Ingress Controller 是一个七层负载均衡调度器，客户端的请求先到达这个七层负载均衡调度器，由七层负载均衡器在反向代理到后端 pod，常见的七层负载均衡器有 nginx、traefik，以我们熟悉的 nginx 为例，假如请求到达 nginx，会通过 upstream 反向代理到后端 pod 应用，但是后端 pod 的 ip 地址是一 直在变化的，因此在后端 pod 前需要加一个 service，这个 service 只是起到分组的作用，那么我们 upstream 只需要填写 service 地址即可

 

2.4 Ingress 和Ingress Controller 总结

 Ingress Controller 可以理解为控制器，它通过不断的跟 Kubernetes API 交互，实时获取后端 Service、Pod 的变化，比如新增、删除等，结合 Ingress 定义的规则生成配置，然后动态更新上边的 Nginx 或者 trafik 负载均衡器，并刷新使配置生效，来达到服务自动发现的作用

Ingress 则是定义规则，通过它定义某个域名的请求过来之后转发到集群中指定的 Service。它可以通过 Yaml 文件定义，可以给一个或多个 Service 定义一个或多个 Ingress 规则。

2.5 使用Ingress Controller代理k8s内部应用的流程

（1）部署 Ingress controller，我们 ingress controller 使用的是 nginx

（2）创建 Service，用来分组 pod

（3）创建 Pod 应用，可以通过控制器创建 pod

（4）创建 Ingress http，测试通过 http 访问应用

（5）创建 Ingress https，测试通过 https 访问应用（域名访问或者ip端口访问）

客户端通过七层调度器访问后端 pod 的方式

使用七层负载均衡调度器 ingress controller 时，当客户端访问 kubernetes 集群内部的应用时，数据包走向如下图流程所示

 2.6 安装Nginx Ingress Controller

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把 yaml 文件上传到对应的 K8s 的 master1 节点上，把 defaultbackend.tar.gz 和 nginx-ingresscontroller.tar.gz 镜像上传到 k8s 的 node1 节点，手动解压镜像：
[root@node1 ingress]# docker load -i defaultbackend.tar.gz
Loaded image: registry.cn-hangzhou.aliyuncs.com/hachikou/defaultbackend:1.0
[root@node1 ingress]# docker load -i nginx-ingress-controller.tar.gz
Loaded image: registry.cn-hangzhou.aliyuncs.com/peter1009/nginx-ingress-controller:0.20.0

更新yaml文件
[root@master ingress]# kubectl apply -f nginx-ingress-controller-rbac.yml 
serviceaccount/nginx-ingress-serviceaccount created
clusterrole.rbac.authorization.k8s.io/nginx-ingress-clusterrole created
role.rbac.authorization.k8s.io/nginx-ingress-role created
rolebinding.rbac.authorization.k8s.io/nginx-ingress-role-nisa-binding created
clusterrolebinding.rbac.authorization.k8s.io/nginx-ingress-clusterrole-nisa-binding created

# 注意default-backend.yaml中设置了node工作节点
[root@master ingress]# kubectl apply -f default-backend.yaml 
deployment.apps/default-http-backend created
service/default-http-backend created

# nodeName设置要和default-backend.yaml中设置一样，需要调度到统一个基点，否则就会报错
[root@master ingress]# kubectl apply -f nginx-ingress-controller.yaml 
deployment.apps/nginx-ingress-controller created
[root@master ingress]# kubectl get pods -n kube-system | grep nginx
nginx-ingress-controller-74cf657846-f6k94   1/1     Running            0          41s
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[root@master ingress]# cat nginx-ingress-controller-rbac.yml 
#apiVersion: v1
#kind: Namespace
#metadata:  #这里是创建一个namespace，因为此namespace早有了就不用再创建了
#  name: kube-system
---
apiVersion: v1
kind: ServiceAccount    
metadata:
  name: nginx-ingress-serviceaccount #创建一个serveerAcount
  namespace: kube-system
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
  name: nginx-ingress-clusterrole   #这个ServiceAcount所绑定的集群角色
rules:
  - apiGroups:
      - "" 
    resources:    #此集群角色的权限，它能操作的API资源 
      - configmaps
      - endpoints
      - nodes
      - pods
      - secrets
    verbs:
      - list
      - watch
  - apiGroups:
      - ""
    resources:
      - nodes
    verbs:
      - get
  - apiGroups:
      - ""
    resources:
      - services
    verbs:
      - get
      - list
      - watch
  - apiGroups:
      - "extensions"
    resources:
      - ingresses
    verbs:
      - get
      - list
      - watch
  - apiGroups:
      - ""
    resources:
        - events
    verbs:
        - create
        - patch
  - apiGroups:
      - "extensions"
    resources:
      - ingresses/status
    verbs:
      - update
---
apiVersion: rbac.authorization.k8s.io/v1
kind: Role
metadata:         
  name: nginx-ingress-role  #这是一个角色，而非集群角色 
  namespace: kube-system
rules:  #角色的权限 
  - apiGroups:
      - ""
    resources:
      - configmaps
      - pods
      - secrets
      - namespaces
    verbs:
      - get
  - apiGroups:
      - ""
    resources:
      - configmaps
    resourceNames:
      # Defaults to "<election-id>-<ingress-class>"
      # Here: "<ingress-controller-leader>-<nginx>"
      # This has to be adapted if you change either parameter
      # when launching the nginx-ingress-controller.
      - "ingress-controller-leader-nginx"
    verbs:
      - get
      - update
  - apiGroups:
      - ""
    resources:
      - configmaps
    verbs:
      - create
  - apiGroups:
      - ""
    resources:
      - endpoints
    verbs:
      - get
      - create
      - update
---
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding       #角色绑定
metadata:
  name: nginx-ingress-role-nisa-binding
  namespace: kube-system
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: Role
  name: nginx-ingress-role
subjects:
  - kind: ServiceAccount
    name: nginx-ingress-serviceaccount #绑定在这个用户 
    namespace: kube-system
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding      #集群绑定
metadata:
  name: nginx-ingress-clusterrole-nisa-binding
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: nginx-ingress-clusterrole
subjects:
  - kind: ServiceAccount
    name: nginx-ingress-serviceaccount   #集群绑定到这个serviceacount
    namespace: kube-system   #集群角色是可以跨namespace，但是这里只指明给这个namespce来使用
nginx-ingress-controller-rbac.yml
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[root@master ingress]# cat default-backend.yaml 
apiVersion: apps/v1
kind: Deployment
metadata:
  name: default-http-backend
  labels:
    k8s-app: default-http-backend
  namespace: kube-system
spec:
  replicas: 1
  selector:
   matchLabels:
     k8s-app: default-http-backend
  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: registry.cn-hangzhou.aliyuncs.com/hachikou/defaultbackend:1.0
        livenessProbe:
          httpGet:
            path: /healthz   #这个URI是 nginx-ingress-controller中nginx里配置好的localtion 
            port: 8080
            scheme: HTTP
          initialDelaySeconds: 30   #30s检测一次/healthz
          timeoutSeconds: 5
        ports:
        - containerPort: 8080
#        resources:
#          limits:
#            cpu: 10m
#            memory: 20Mi
#          requests:
#            cpu: 10m
#            memory: 20Mi
      nodeName: node1
---
apiVersion: v1
kind: Service     #为default backend 创建一个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
default-backend.yaml
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apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-ingress-controller
  labels:
    k8s-app: nginx-ingress-controller
  namespace: kube-system
spec:
  replicas: 1
  selector:
    matchLabels:
       k8s-app: nginx-ingress-controller
  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 #注释表示不使用宿主机的80口，
      terminationGracePeriodSeconds: 60
      hostNetwork: true  #表示容器使用和宿主机一样的网络
      serviceAccountName: nginx-ingress-serviceaccount #引用前面创建的serviceacount
      containers:   
      - image: registry.cn-hangzhou.aliyuncs.com/peter1009/nginx-ingress-controller:0.20.0      #容器使用的镜像
        name: nginx-ingress-controller  #容器名
        readinessProbe:   #启动这个服务时要验证/healthz 端口10254会在运行的node上监听。 
          httpGet:
            path: /healthz
            port: 10254
            scheme: HTTP
        livenessProbe:
          httpGet:
            path: /healthz
            port: 10254
            scheme: HTTP
          initialDelaySeconds: 10  #每隔10做健康检查 
          timeoutSeconds: 1
        ports:
        - containerPort: 80  
          hostPort: 80    #80映射到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=$(POD_NAMESPACE)/default-http-backend
#        - --default-ssl-certificate=$(POD_NAMESPACE)/ingress-secret    #这是启用Https时用的
#      nodeSelector:  #指明运行在哪，此IP要和default backend是同一个IP
#        kubernetes.io/hostname: 10.3.1.17   #上面映射到了hostport80，确保此IP80，443没有占用.
# 
      nodeName: node1
nginx-ingress-controller.yaml
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# ingress-nginx-controller:v1.9.1版本
# deploy，记得添加hostnetwork:true
apiVersion: v1
kind: Namespace
metadata:
  labels:
    app.kubernetes.io/instance: ingress-nginx
    app.kubernetes.io/name: ingress-nginx
  name: ingress-nginx
---
apiVersion: v1
automountServiceAccountToken: true
kind: ServiceAccount
metadata:
  labels:
    app.kubernetes.io/component: controller
    app.kubernetes.io/instance: ingress-nginx
    app.kubernetes.io/name: ingress-nginx
    app.kubernetes.io/part-of: ingress-nginx
    app.kubernetes.io/version: 1.9.1
  name: ingress-nginx
  namespace: ingress-nginx
---
apiVersion: v1
kind: ServiceAccount
metadata:
  labels:
    app.kubernetes.io/component: admission-webhook
    app.kubernetes.io/instance: ingress-nginx
    app.kubernetes.io/name: ingress-nginx
    app.kubernetes.io/part-of: ingress-nginx
    app.kubernetes.io/version: 1.9.1
  name: ingress-nginx-admission
  namespace: ingress-nginx
---
apiVersion: rbac.authorization.k8s.io/v1
kind: Role
metadata:
  labels:
    app.kubernetes.io/component: controller
    app.kubernetes.io/instance: ingress-nginx
    app.kubernetes.io/name: ingress-nginx
    app.kubernetes.io/part-of: ingress-nginx
    app.kubernetes.io/version: 1.9.1
  name: ingress-nginx
  namespace: ingress-nginx
rules:
- apiGroups:
  - ""
  resources:
  - namespaces
  verbs:
  - get
- apiGroups:
  - ""
  resources:
  - configmaps
  - pods
  - secrets
  - endpoints
  verbs:
  - get
  - list
  - watch
- apiGroups:
  - ""
  resources:
  - services
  verbs:
  - get
  - list
  - watch
- apiGroups:
  - networking.k8s.io
  resources:
  - ingresses
  verbs:
  - get
  - list
  - watch
- apiGroups:
  - networking.k8s.io
  resources:
  - ingresses/status
  verbs:
  - update
- apiGroups:
  - networking.k8s.io
  resources:
  - ingressclasses
  verbs:
  - get
  - list
  - watch
- apiGroups:
  - coordination.k8s.io
  resourceNames:
  - ingress-nginx-leader
  resources:
  - leases
  verbs:
  - get
  - update
- apiGroups:
  - coordination.k8s.io
  resources:
  - leases
  verbs:
  - create
- apiGroups:
  - ""
  resources:
  - events
  verbs:
  - create
  - patch
- apiGroups:
  - discovery.k8s.io
  resources:
  - endpointslices
  verbs:
  - list
  - watch
  - get
---
apiVersion: rbac.authorization.k8s.io/v1
kind: Role
metadata:
  labels:
    app.kubernetes.io/component: admission-webhook
    app.kubernetes.io/instance: ingress-nginx
    app.kubernetes.io/name: ingress-nginx
    app.kubernetes.io/part-of: ingress-nginx
    app.kubernetes.io/version: 1.9.1
  name: ingress-nginx-admission
  namespace: ingress-nginx
rules:
- apiGroups:
  - ""
  resources:
  - secrets
  verbs:
  - get
  - create
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
  labels:
    app.kubernetes.io/instance: ingress-nginx
    app.kubernetes.io/name: ingress-nginx
    app.kubernetes.io/part-of: ingress-nginx
    app.kubernetes.io/version: 1.9.1
  name: ingress-nginx
rules:
- apiGroups:
  - ""
  resources:
  - configmaps
  - endpoints
  - nodes
  - pods
  - secrets
  - namespaces
  verbs:
  - list
  - watch
- apiGroups:
  - coordination.k8s.io
  resources:
  - leases
  verbs:
  - list
  - watch
- apiGroups:
  - ""
  resources:
  - nodes
  verbs:
  - get
- apiGroups:
  - ""
  resources:
  - services
  verbs:
  - get
  - list
  - watch
- apiGroups:
  - networking.k8s.io
  resources:
  - ingresses
  verbs:
  - get
  - list
  - watch
- apiGroups:
  - ""
  resources:
  - events
  verbs:
  - create
  - patch
- apiGroups:
  - networking.k8s.io
  resources:
  - ingresses/status
  verbs:
  - update
- apiGroups:
  - networking.k8s.io
  resources:
  - ingressclasses
  verbs:
  - get
  - list
  - watch
- apiGroups:
  - discovery.k8s.io
  resources:
  - endpointslices
  verbs:
  - list
  - watch
  - get
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
  labels:
    app.kubernetes.io/component: admission-webhook
    app.kubernetes.io/instance: ingress-nginx
    app.kubernetes.io/name: ingress-nginx
    app.kubernetes.io/part-of: ingress-nginx
    app.kubernetes.io/version: 1.9.1
  name: ingress-nginx-admission
rules:
- apiGroups:
  - admissionregistration.k8s.io
  resources:
  - validatingwebhookconfigurations
  verbs:
  - get
  - update
---
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
  labels:
    app.kubernetes.io/component: controller
    app.kubernetes.io/instance: ingress-nginx
    app.kubernetes.io/name: ingress-nginx
    app.kubernetes.io/part-of: ingress-nginx
    app.kubernetes.io/version: 1.9.1
  name: ingress-nginx
  namespace: ingress-nginx
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: Role
  name: ingress-nginx
subjects:
- kind: ServiceAccount
  name: ingress-nginx
  namespace: ingress-nginx
---
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
  labels:
    app.kubernetes.io/component: admission-webhook
    app.kubernetes.io/instance: ingress-nginx
    app.kubernetes.io/name: ingress-nginx
    app.kubernetes.io/part-of: ingress-nginx
    app.kubernetes.io/version: 1.9.1
  name: ingress-nginx-admission
  namespace: ingress-nginx
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: Role
  name: ingress-nginx-admission
subjects:
- kind: ServiceAccount
  name: ingress-nginx-admission
  namespace: ingress-nginx
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  labels:
    app.kubernetes.io/instance: ingress-nginx
    app.kubernetes.io/name: ingress-nginx
    app.kubernetes.io/part-of: ingress-nginx
    app.kubernetes.io/version: 1.9.1
  name: ingress-nginx
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: ingress-nginx
subjects:
- kind: ServiceAccount
  name: ingress-nginx
  namespace: ingress-nginx
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  labels:
    app.kubernetes.io/component: admission-webhook
    app.kubernetes.io/instance: ingress-nginx
    app.kubernetes.io/name: ingress-nginx
    app.kubernetes.io/part-of: ingress-nginx
    app.kubernetes.io/version: 1.9.1
  name: ingress-nginx-admission
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: ingress-nginx-admission
subjects:
- kind: ServiceAccount
  name: ingress-nginx-admission
  namespace: ingress-nginx
---
apiVersion: v1
data:
  allow-snippet-annotations: "false"
kind: ConfigMap
metadata:
  labels:
    app.kubernetes.io/component: controller
    app.kubernetes.io/instance: ingress-nginx
    app.kubernetes.io/name: ingress-nginx
    app.kubernetes.io/part-of: ingress-nginx
    app.kubernetes.io/version: 1.9.1
  name: ingress-nginx-controller
  namespace: ingress-nginx
---
apiVersion: v1
kind: Service
metadata:
  labels:
    app.kubernetes.io/component: controller
    app.kubernetes.io/instance: ingress-nginx
    app.kubernetes.io/name: ingress-nginx
    app.kubernetes.io/part-of: ingress-nginx
    app.kubernetes.io/version: 1.9.1
  name: ingress-nginx-controller
  namespace: ingress-nginx
spec:
  externalTrafficPolicy: Local
  ipFamilies:
  - IPv4
  ipFamilyPolicy: SingleStack
  ports:
  - appProtocol: http
    name: http
    port: 80
    protocol: TCP
    targetPort: http
  - appProtocol: https
    name: https
    port: 443
    protocol: TCP
    targetPort: https
  selector:
    app.kubernetes.io/component: controller
    app.kubernetes.io/instance: ingress-nginx
    app.kubernetes.io/name: ingress-nginx
  type: LoadBalancer
---
apiVersion: v1
kind: Service
metadata:
  labels:
    app.kubernetes.io/component: controller
    app.kubernetes.io/instance: ingress-nginx
    app.kubernetes.io/name: ingress-nginx
    app.kubernetes.io/part-of: ingress-nginx
    app.kubernetes.io/version: 1.9.1
  name: ingress-nginx-controller-admission
  namespace: ingress-nginx
spec:
  ports:
  - appProtocol: https
    name: https-webhook
    port: 443
    targetPort: webhook
  selector:
    app.kubernetes.io/component: controller
    app.kubernetes.io/instance: ingress-nginx
    app.kubernetes.io/name: ingress-nginx
  type: ClusterIP
---
apiVersion: apps/v1
kind: Deployment
metadata:
  labels:
    app.kubernetes.io/component: controller
    app.kubernetes.io/instance: ingress-nginx
    app.kubernetes.io/name: ingress-nginx
    app.kubernetes.io/part-of: ingress-nginx
    app.kubernetes.io/version: 1.9.1
  name: ingress-nginx-controller
  namespace: ingress-nginx
spec:
  minReadySeconds: 0
  revisionHistoryLimit: 10
  selector:
    matchLabels:
      app.kubernetes.io/component: controller
      app.kubernetes.io/instance: ingress-nginx
      app.kubernetes.io/name: ingress-nginx
  strategy:
    rollingUpdate:
      maxUnavailable: 1
    type: RollingUpdate
  template:
    metadata:
      labels:
        app.kubernetes.io/component: controller
        app.kubernetes.io/instance: ingress-nginx
        app.kubernetes.io/name: ingress-nginx
        app.kubernetes.io/part-of: ingress-nginx
        app.kubernetes.io/version: 1.9.1
    spec:
      hostNetwork: true
      containers:
      - args:
        - /nginx-ingress-controller
        - --publish-service=$(POD_NAMESPACE)/ingress-nginx-controller
        - --election-id=ingress-nginx-leader
        - --controller-class=k8s.io/ingress-nginx
        - --ingress-class=nginx
        - --configmap=$(POD_NAMESPACE)/ingress-nginx-controller
        - --validating-webhook=:8443
        - --validating-webhook-certificate=/usr/local/certificates/cert
        - --validating-webhook-key=/usr/local/certificates/key
        env:
        - name: POD_NAME
          valueFrom:
            fieldRef:
              fieldPath: metadata.name
        - name: POD_NAMESPACE
          valueFrom:
            fieldRef:
              fieldPath: metadata.namespace
        - name: LD_PRELOAD
          value: /usr/local/lib/libmimalloc.so
        #image: registry.k8s.io/ingress-nginx/controller:v1.9.1@sha256:605a737877de78969493a4b1213b21de4ee425d2926906857b98050f57a95b25
        image: registry.cn-hangzhou.aliyuncs.com/google_containers/nginx-ingress-controller:v1.9.1
        imagePullPolicy: IfNotPresent
        lifecycle:
          preStop:
            exec:
              command:
              - /wait-shutdown
        livenessProbe:
          failureThreshold: 5
          httpGet:
            path: /healthz
            port: 10254
            scheme: HTTP
          initialDelaySeconds: 10
          periodSeconds: 10
          successThreshold: 1
          timeoutSeconds: 1
        name: controller
        ports:
        - containerPort: 80
          name: http
          protocol: TCP
        - containerPort: 443
          name: https
          protocol: TCP
        - containerPort: 8443
          name: webhook
          protocol: TCP
        readinessProbe:
          failureThreshold: 3
          httpGet:
            path: /healthz
            port: 10254
            scheme: HTTP
          initialDelaySeconds: 10
          periodSeconds: 10
          successThreshold: 1
          timeoutSeconds: 1
        resources:
          requests:
            cpu: 100m
            memory: 90Mi
        securityContext:
          allowPrivilegeEscalation: true
          capabilities:
            add:
            - NET_BIND_SERVICE
            drop:
            - ALL
          runAsUser: 101
        volumeMounts:
        - mountPath: /usr/local/certificates/
          name: webhook-cert
          readOnly: true
      dnsPolicy: ClusterFirst
      nodeSelector:
        kubernetes.io/os: linux
      serviceAccountName: ingress-nginx
      terminationGracePeriodSeconds: 300
      volumes:
      - name: webhook-cert
        secret:
          secretName: ingress-nginx-admission
---
apiVersion: batch/v1
kind: Job
metadata:
  labels:
    app.kubernetes.io/component: admission-webhook
    app.kubernetes.io/instance: ingress-nginx
    app.kubernetes.io/name: ingress-nginx
    app.kubernetes.io/part-of: ingress-nginx
    app.kubernetes.io/version: 1.9.1
  name: ingress-nginx-admission-create
  namespace: ingress-nginx
spec:
  template:
    metadata:
      labels:
        app.kubernetes.io/component: admission-webhook
        app.kubernetes.io/instance: ingress-nginx
        app.kubernetes.io/name: ingress-nginx
        app.kubernetes.io/part-of: ingress-nginx
        app.kubernetes.io/version: 1.9.1
      name: ingress-nginx-admission-create
    spec:
      containers:
      - args:
        - create
        - --host=ingress-nginx-controller-admission,ingress-nginx-controller-admission.$(POD_NAMESPACE).svc
        - --namespace=$(POD_NAMESPACE)
        - --secret-name=ingress-nginx-admission
        env:
        - name: POD_NAMESPACE
          valueFrom:
            fieldRef:
              fieldPath: metadata.namespace
        image: registry.cn-hangzhou.aliyuncs.com/google_containers/kube-webhook-certgen:v20230407
        imagePullPolicy: IfNotPresent
        name: create
        securityContext:
          allowPrivilegeEscalation: false
      nodeSelector:
        kubernetes.io/os: linux
      restartPolicy: OnFailure
      securityContext:
        fsGroup: 2000
        runAsNonRoot: true
        runAsUser: 2000
      serviceAccountName: ingress-nginx-admission
---
apiVersion: batch/v1
kind: Job
metadata:
  labels:
    app.kubernetes.io/component: admission-webhook
    app.kubernetes.io/instance: ingress-nginx
    app.kubernetes.io/name: ingress-nginx
    app.kubernetes.io/part-of: ingress-nginx
    app.kubernetes.io/version: 1.9.1
  name: ingress-nginx-admission-patch
  namespace: ingress-nginx
spec:
  template:
    metadata:
      labels:
        app.kubernetes.io/component: admission-webhook
        app.kubernetes.io/instance: ingress-nginx
        app.kubernetes.io/name: ingress-nginx
        app.kubernetes.io/part-of: ingress-nginx
        app.kubernetes.io/version: 1.9.1
      name: ingress-nginx-admission-patch
    spec:
      containers:
      - args:
        - patch
        - --webhook-name=ingress-nginx-admission
        - --namespace=$(POD_NAMESPACE)
        - --patch-mutating=false
        - --secret-name=ingress-nginx-admission
        - --patch-failure-policy=Fail
        env:
        - name: POD_NAMESPACE
          valueFrom:
            fieldRef:
              fieldPath: metadata.namespace
#        image: registry.k8s.io/ingress-nginx/kube-webhook-certgen:v20230407@sha256:543c40fd093964bc9ab509d3e791f9989963021f1e9e4c9c7b6700b02bfb227b
        image: registry.cn-hangzhou.aliyuncs.com/google_containers/kube-webhook-certgen:v20230407
        imagePullPolicy: IfNotPresent
        name: patch
        securityContext:
          allowPrivilegeEscalation: false
      nodeSelector:
        kubernetes.io/os: linux
      restartPolicy: OnFailure
      securityContext:
        fsGroup: 2000
        runAsNonRoot: true
        runAsUser: 2000
      serviceAccountName: ingress-nginx-admission
---
apiVersion: networking.k8s.io/v1
kind: IngressClass
metadata:
  labels:
    app.kubernetes.io/component: controller
    app.kubernetes.io/instance: ingress-nginx
    app.kubernetes.io/name: ingress-nginx
    app.kubernetes.io/part-of: ingress-nginx
    app.kubernetes.io/version: 1.9.1
  name: nginx
spec:
  controller: k8s.io/ingress-nginx
---
apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  labels:
    app.kubernetes.io/component: admission-webhook
    app.kubernetes.io/instance: ingress-nginx
    app.kubernetes.io/name: ingress-nginx
    app.kubernetes.io/part-of: ingress-nginx
    app.kubernetes.io/version: 1.9.1
  name: ingress-nginx-admission
  namespace: ingress-nginx
spec:
  egress:
  - {}
  podSelector:
    matchLabels:
      app.kubernetes.io/component: admission-webhook
      app.kubernetes.io/instance: ingress-nginx
      app.kubernetes.io/name: ingress-nginx
  policyTypes:
  - Ingress
  - Egress
---
apiVersion: admissionregistration.k8s.io/v1
kind: ValidatingWebhookConfiguration
metadata:
  labels:
    app.kubernetes.io/component: admission-webhook
    app.kubernetes.io/instance: ingress-nginx
    app.kubernetes.io/name: ingress-nginx
    app.kubernetes.io/part-of: ingress-nginx
    app.kubernetes.io/version: 1.9.1
  name: ingress-nginx-admission
webhooks:
- admissionReviewVersions:
  - v1
  clientConfig:
    service:
      name: ingress-nginx-controller-admission
      namespace: ingress-nginx
      path: /networking/v1/ingresses
  failurePolicy: Fail
  matchPolicy: Equivalent
  name: validate.nginx.ingress.kubernetes.io
  rules:
  - apiGroups:
    - networking.k8s.io
    apiVersions:
    - v1
    operations:
    - CREATE
    - UPDATE
    resources:
    - ingresses
  sideEffects: None

# ingress-myapp.yaml
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: ingress-myapp-v1
  namespace: ingress-nginx
spec:
  ingressClassName: nginx  # classname在ingress-nginx-controller中有设置
  rules:
  - host: tomcat.lucky.com
    http:
      paths:
      - path: /
        pathType: Prefix
        backend:
          service:
            name: tomcat
            port:
              number: 8080
# tomcat.yaml修改下namespace
# 访问的时候请查看下kubectl get pods -n ingress-nginx | grep nginx 的IP
k8s1.28版本安装ingress-nginx
复制代码

ingress-nginx部署文件下载：https://raw.githubusercontent.com/kubernetes/ingress-nginx/controller-v1.9.1/deploy/static/provider/cloud/deploy.yaml

https://github.com/kubernetes/ingress-nginx/blob/controller-v1.9.1/deploy/static/provider/cloud/deploy.yaml

2.7 测试Ingress HTTP代理k8s内部的tomcat站点

复制代码
apiVersion: v1
kind: Service
metadata:
  name: tomcat
  namespace: default
spec:
  selector:
    app: tomcat
    release: canary
  ports:
  - name: http
    targetPort: 8080
    port: 8080
  - name: ajp
    targetPort: 8009
    port: 8009
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: tomcat-deploy
  namespace: default
spec:
  replicas: 2
  selector:
    matchLabels:
      app: tomcat
      release: canary
  template:
    metadata:
      labels:
        app: tomcat
        release: canary
    spec:
      containers:
      - name: tomcat
        image: tomcat:8.5.34-jre8-alpine
        imagePullPolicy: IfNotPresent
        ports:
        - name: http
          containerPort: 8080
          name: ajp
          containerPort: 8009
tomcat-deploy.yaml
复制代码
复制代码
[root@master tomcat]# kubectl apply -f deploy.yaml 
service/tomcat created
deployment.apps/tomcat-deploy created

[root@master tomcat]# kubectl get pods
NAME                             READY   STATUS    RESTARTS   AGE
tomcat-deploy-66b67fcf7b-cwnhq   1/1     Running   0          53s
tomcat-deploy-66b67fcf7b-kt4q7   1/1     Running   0          53s

[root@master tomcat]# kubectl get svc
NAME         TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)             AGE
kubernetes   ClusterIP   10.96.0.1        <none>        443/TCP             12d
tomcat       ClusterIP   10.110.211.147   <none>        8080/TCP,8009/TCP   111s
复制代码
复制代码
# 新版写法
https://kubernetes.io/zh-cn/docs/concepts/services-networking/ingress/#deprecated-annotation

[root@master tomcat]# cat ingress-myapp.yaml 
apiVersion: extensions/v1beta1 #api 版本，新版本换名字了
kind: Ingress #清单类型
metadata: #元数据
  name: ingress-myapp #ingress 的名称
  namespace: default #所属名称空间
  annotations: #注解信息
    kubernetes.io/ingress.class: "nginx"
spec: #规格
  rules: #定义后端转发的规则
  - host: tomcat.lucky.com #浏览器访问域名进行转发
    http:
      paths: 
      - path: #配置访问路径，如果通过 url 进行转发，需要修改；空默认为访问的路径为"/"
        backend: #配置后端服务
          serviceName: tomcat
          servicePort: 8080

# warning忽略
[root@master tomcat]# kubectl apply -f ingress-myapp.yaml 
Warning: extensions/v1beta1 Ingress is deprecated in v1.14+, unavailable in v1.22+; use networking.k8s.io/v1 Ingress
ingress.extensions/ingress-myapp created

[root@master tomcat]# kubectl get ingress
NAME            CLASS    HOSTS              ADDRESS   PORTS   AGE
ingress-myapp   <none>   tomcat.lucky.com             80      11m
[root@master tomcat]# kubectl describe ingress ingress-myapp
Name:             ingress-myapp
Namespace:        default
Address:          
Default backend:  default-http-backend:80 (10.244.166.129:8080)
Rules:
  Host              Path  Backends
  ----              ----  --------
  tomcat.lucky.com  
                       tomcat:8080 (10.244.166.130:8080,10.244.166.131:8080)
Annotations:        kubernetes.io/ingress.class: nginx
Events:             <none>  # 应该有东西，但是没出来

[root@master tomcat]# kubectl exec -it nginx-ingress-controller-74cf657846-f6k94 -n kube-system -- /bin/bash
www-data@node1:/etc/nginx$ cat nginx.conf
    server {
        server_name tomcat.lucky.com ;
        listen 80;
        listen [::]:80;
        set $proxy_upstream_name "-";
        
        location / {
            
            set $namespace      "default";
            set $ingress_name   "ingress-myapp";
            set $service_name   "tomcat";
            set $service_port   "8080";
            set $location_path  "/";
                       
            proxy_pass http://upstream_balancer;
复制代码
[root@master tomcat]# kubectl get pods -n kube-system -o wide | grep nginx
nginx-ingress-controller-74cf657846-f6k94   1/1     Running            0          62m    192.168.10.11    node1    <none>           <none>
default-http-backend-d868478df-6fp7f        1/1     Running            0          66m    10.244.166.129   node1    <none>           <none>

# http访问绑定hosts,本地绑定IP为
192.168.10.11 tomcat.lucky.com

访问：http://tomcat.lucky.com

 

 2.8 测试Ingress HTTPS 代理k8s内部的tomcat

构建TLS站点

复制代码
#1.准备证书，在k8s控制节点操作
openssl genrsa -out tls.key 2048
openssl req -new -x509 -key tls.key -out tls.crt -subj /C=CN/ST=Beijing/L=Beijing/O=DevOps/CN=tomcat.lucky.com

# 2.生成secret,在控制节点操作
kubectl create secret tls tomcat-ingress-secret --cert=tls.crt --key=tls.key

# 3.查看secret
[root@master https]# kubectl get secret
NAME                    TYPE                                  DATA   AGE
default-token-cj9pm     kubernetes.io/service-account-token   3      12d
tomcat-ingress-secret   kubernetes.io/tls                     2      37s

# 4.创建Ingress
[root@master https]# cat ingress-tomcat-tls.yaml 
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: ingress-tomcat-tls
  namespace: default
  annotations:
    kubernetes.io/ingress.class: "nginx"
spec:
  tls:
  - hosts: 
    - tomcat.lucky.com
    secretName: tomcat-ingress-secret
  rules:
  - host: tomcat.lucky.com
    http:
      paths:
      - path:
        backend:
          serviceName: tomcat
          servicePort: 8080

[root@master https]# kubectl apply -f ingress-tomcat-tls.yaml 
Warning: extensions/v1beta1 Ingress is deprecated in v1.14+, unavailable in v1.22+; use networking.k8s.io/v1 Ingress
ingress.extensions/ingress-tomcat-tls created

[root@master https]# kubectl get ingress
NAME                 CLASS    HOSTS              ADDRESS   PORTS     AGE
ingress-myapp        <none>   tomcat.lucky.com             80        41m
ingress-tomcat-tls   <none>   tomcat.lucky.com             80, 443   34s

# tomcat后端服务还是用之前http的,我们只写了ingress规则
复制代码

访问：https://tomcat.lucky.com

 

posted on   杨梅冲  阅读(356)  评论(0)  编辑  收藏  举报
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