k8s 新版本 部署 Ingress-nginx controller
2024-09-06 13:04:57
k8s 新版本 部署 Ingress-nginx controller
本篇主要记录一下 k8s 新版本 1.23.5 中如何搭建 ingress controller 以及里面的注意项
新版本和老版本 区别有不少 ，坑很多，只能从官网一点点撸
1.环境准备
- 操作系统：Centos7 （CentOS Linux release 7.9.2009）
- Master 主节点： 1台 虚拟机
- Node 计算节点： 2台 虚拟机
- K8s version：v1.23.5 （选的较新的版本）
- Docker version：20.10.14
环境和上一篇中 kubeadm 搭建 k8s 的一致
2.概述
下面从 官网摘取的对于 Ingress 的介绍
2.1 什么是 Ingress
Ingress 是对集群中服务的外部访问进行管理的 API 对象，典型的访问方式是 HTTP。Ingress 可以提供负载均衡
Ingress 公开了从集群外部到集群内服务的 HTTP 和 HTTPS 路由。 流量路由由 Ingress 资源上定义的规则控制。
下面是一个将所有流量都发送到同一 Service 的简单 Ingress 示例：
但是 仅创建 Ingress 资源本身没有任何效果，需要有对应的 Ingress 控制器 ，你可能需要部署 Ingress 控制器，例如 ingress-nginx。 你可以从许多 Ingress 控制器 中进行选择。
2.2 什么是 Ingress controller
为了让 Ingress 资源工作，集群必须有一个正在运行的 Ingress 控制器。k8s官网维护了 3 个Ingress控制器
目前支持和维护 AWS、 GCE 和 Nginx Ingress 控制器 ，本篇就拿 Ingress-nginx 作为控制器为例 讲解一下如何部署
还有一些 社区等提供的 控制器
3.部署 Ingress-nginx controller
本篇就拿 最常用的 Ingress-nginx 作为 Ingress的控制器，实现k8s 把请求重定向到集群内部（Cluster Ip）服务去
3.1 deploy.yaml 坑点
Ingress-nginx 官网 https://kubernetes.github.io/ingress-nginx/ 提到了 deploy.yaml 文件
Ingress-nginx 新版本的 depoly.yaml 有些不同，需要拉取下面2个镜像
k8s.gcr.io/ingress-nginx/controller:v1.1.2
k8s.gcr.io/ingress-nginx/kube-webhook-certgen:v1.1.1
多半是下载不到的，所以需要 自己替换一下 ，可以去docker hub 上找到对应的 镜像文件
总结 坑点：
- 新版本中 提供了 IngressClass ，需要在编写 Ingress 的时候指定
- Image 加载不到，需要手动去 docker hub 上找其他的 并且修改 deploy.yaml文件
- 把 ingress-nginx-controller 使用 hostNetwork: true 进行部署 比 NodePort 减少一层转发，但是需要指定 选择打了标签的 node nodeSelector: app: ingress
3.2 deploy.yaml 样例（我自己修改后的 可以参考）
#GENERATED FOR K8S 1.20
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/managed-by: Helm
app.kubernetes.io/name: ingress-nginx
app.kubernetes.io/part-of: ingress-nginx
app.kubernetes.io/version: 1.1.2
helm.sh/chart: ingress-nginx-4.0.18
name: ingress-nginx
namespace: ingress-nginx
---
apiVersion: v1
kind: ServiceAccount
metadata:
annotations:
helm.sh/hook: pre-install,pre-upgrade,post-install,post-upgrade
helm.sh/hook-delete-policy: before-hook-creation,hook-succeeded
labels:
app.kubernetes.io/component: admission-webhook
app.kubernetes.io/instance: ingress-nginx
app.kubernetes.io/managed-by: Helm
app.kubernetes.io/name: ingress-nginx
app.kubernetes.io/part-of: ingress-nginx
app.kubernetes.io/version: 1.1.2
helm.sh/chart: ingress-nginx-4.0.18
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/managed-by: Helm
app.kubernetes.io/name: ingress-nginx
app.kubernetes.io/part-of: ingress-nginx
app.kubernetes.io/version: 1.1.2
helm.sh/chart: ingress-nginx-4.0.18
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:
- ""
resourceNames:
- ingress-controller-leader
resources:
- configmaps
verbs:
- get
- update
- apiGroups:
- ""
resources:
- configmaps
verbs:
- create
- apiGroups:
- ""
resources:
- events
verbs:
- create
- patch
---
apiVersion: rbac.authorization.k8s.io/v1
kind: Role
metadata:
annotations:
helm.sh/hook: pre-install,pre-upgrade,post-install,post-upgrade
helm.sh/hook-delete-policy: before-hook-creation,hook-succeeded
labels:
app.kubernetes.io/component: admission-webhook
app.kubernetes.io/instance: ingress-nginx
app.kubernetes.io/managed-by: Helm
app.kubernetes.io/name: ingress-nginx
app.kubernetes.io/part-of: ingress-nginx
app.kubernetes.io/version: 1.1.2
helm.sh/chart: ingress-nginx-4.0.18
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/managed-by: Helm
app.kubernetes.io/name: ingress-nginx
app.kubernetes.io/part-of: ingress-nginx
app.kubernetes.io/version: 1.1.2
helm.sh/chart: ingress-nginx-4.0.18
name: ingress-nginx
rules:
- apiGroups:
- ""
resources:
- configmaps
- endpoints
- nodes
- pods
- secrets
- namespaces
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
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
annotations:
helm.sh/hook: pre-install,pre-upgrade,post-install,post-upgrade
helm.sh/hook-delete-policy: before-hook-creation,hook-succeeded
labels:
app.kubernetes.io/component: admission-webhook
app.kubernetes.io/instance: ingress-nginx
app.kubernetes.io/managed-by: Helm
app.kubernetes.io/name: ingress-nginx
app.kubernetes.io/part-of: ingress-nginx
app.kubernetes.io/version: 1.1.2
helm.sh/chart: ingress-nginx-4.0.18
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/managed-by: Helm
app.kubernetes.io/name: ingress-nginx
app.kubernetes.io/part-of: ingress-nginx
app.kubernetes.io/version: 1.1.2
helm.sh/chart: ingress-nginx-4.0.18
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:
annotations:
helm.sh/hook: pre-install,pre-upgrade,post-install,post-upgrade
helm.sh/hook-delete-policy: before-hook-creation,hook-succeeded
labels:
app.kubernetes.io/component: admission-webhook
app.kubernetes.io/instance: ingress-nginx
app.kubernetes.io/managed-by: Helm
app.kubernetes.io/name: ingress-nginx
app.kubernetes.io/part-of: ingress-nginx
app.kubernetes.io/version: 1.1.2
helm.sh/chart: ingress-nginx-4.0.18
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/managed-by: Helm
app.kubernetes.io/name: ingress-nginx
app.kubernetes.io/part-of: ingress-nginx
app.kubernetes.io/version: 1.1.2
helm.sh/chart: ingress-nginx-4.0.18
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:
annotations:
helm.sh/hook: pre-install,pre-upgrade,post-install,post-upgrade
helm.sh/hook-delete-policy: before-hook-creation,hook-succeeded
labels:
app.kubernetes.io/component: admission-webhook
app.kubernetes.io/instance: ingress-nginx
app.kubernetes.io/managed-by: Helm
app.kubernetes.io/name: ingress-nginx
app.kubernetes.io/part-of: ingress-nginx
app.kubernetes.io/version: 1.1.2
helm.sh/chart: ingress-nginx-4.0.18
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: "true"
kind: ConfigMap
metadata:
labels:
app.kubernetes.io/component: controller
app.kubernetes.io/instance: ingress-nginx
app.kubernetes.io/managed-by: Helm
app.kubernetes.io/name: ingress-nginx
app.kubernetes.io/part-of: ingress-nginx
app.kubernetes.io/version: 1.1.2
helm.sh/chart: ingress-nginx-4.0.18
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/managed-by: Helm
app.kubernetes.io/name: ingress-nginx
app.kubernetes.io/part-of: ingress-nginx
app.kubernetes.io/version: 1.1.2
helm.sh/chart: ingress-nginx-4.0.18
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/managed-by: Helm
app.kubernetes.io/name: ingress-nginx
app.kubernetes.io/part-of: ingress-nginx
app.kubernetes.io/version: 1.1.2
helm.sh/chart: ingress-nginx-4.0.18
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/managed-by: Helm
app.kubernetes.io/name: ingress-nginx
app.kubernetes.io/part-of: ingress-nginx
app.kubernetes.io/version: 1.1.2
helm.sh/chart: ingress-nginx-4.0.18
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
template:
metadata:
labels:
app.kubernetes.io/component: controller
app.kubernetes.io/instance: ingress-nginx
app.kubernetes.io/name: ingress-nginx
spec:
hostNetwork: true #修改 ingress-nginx-controller 为 hostNetwork模式
nodeSelector: #选择 node label 中有 app=ingress的节点进行部署
app: ingress
containers:
- args:
- /nginx-ingress-controller
- --publish-service=$(POD_NAMESPACE)/ingress-nginx-controller
- --election-id=ingress-controller-leader
- --controller-class=k8s.io/ingress-nginx
- --ingress-class=nginx
- --configmap=$(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: k8s.gcr.io/ingress-nginx/controller:v1.1.2 #修改镜像地址
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:
annotations:
helm.sh/hook: pre-install,pre-upgrade
helm.sh/hook-delete-policy: before-hook-creation,hook-succeeded
labels:
app.kubernetes.io/component: admission-webhook
app.kubernetes.io/instance: ingress-nginx
app.kubernetes.io/managed-by: Helm
app.kubernetes.io/name: ingress-nginx
app.kubernetes.io/part-of: ingress-nginx
app.kubernetes.io/version: 1.1.2
helm.sh/chart: ingress-nginx-4.0.18
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/managed-by: Helm
app.kubernetes.io/name: ingress-nginx
app.kubernetes.io/part-of: ingress-nginx
app.kubernetes.io/version: 1.1.2
helm.sh/chart: ingress-nginx-4.0.18
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: k8s.gcr.io/ingress-nginx/kube-webhook-certgen:v1.1.1 #修改镜像地址
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:
annotations:
helm.sh/hook: post-install,post-upgrade
helm.sh/hook-delete-policy: before-hook-creation,hook-succeeded
labels:
app.kubernetes.io/component: admission-webhook
app.kubernetes.io/instance: ingress-nginx
app.kubernetes.io/managed-by: Helm
app.kubernetes.io/name: ingress-nginx
app.kubernetes.io/part-of: ingress-nginx
app.kubernetes.io/version: 1.1.2
helm.sh/chart: ingress-nginx-4.0.18
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/managed-by: Helm
app.kubernetes.io/name: ingress-nginx
app.kubernetes.io/part-of: ingress-nginx
app.kubernetes.io/version: 1.1.2
helm.sh/chart: ingress-nginx-4.0.18
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: k8s.gcr.io/ingress-nginx/kube-webhook-certgen:v1.1.1 #修改镜像地址
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/managed-by: Helm
app.kubernetes.io/name: ingress-nginx
app.kubernetes.io/part-of: ingress-nginx
app.kubernetes.io/version: 1.1.2
helm.sh/chart: ingress-nginx-4.0.18
name: nginx
spec:
controller: k8s.io/ingress-nginx
---
apiVersion: admissionregistration.k8s.io/v1
kind: ValidatingWebhookConfiguration
metadata:
labels:
app.kubernetes.io/component: admission-webhook
app.kubernetes.io/instance: ingress-nginx
app.kubernetes.io/managed-by: Helm
app.kubernetes.io/name: ingress-nginx
app.kubernetes.io/part-of: ingress-nginx
app.kubernetes.io/version: 1.1.2
helm.sh/chart: ingress-nginx-4.0.18
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
4.部署 Ingress-nginx
4.1 准备工作
给 node2 节点打了app=ingress标签，因为上面的ingress-nginx-controller 使用的是 hostNetwork 模式（只会放pod真实pod 的 端口） + nodeSelector
kubectl label node kubec-node-2 app=ingress
4.2 部署 kubect apply -f
kubectl apply -f deploy.yaml #通过 kubectl apply 命令进行部署 ，前提是镜像准备好，否则GG
4.3 查看状态
kubectl get all -n ingress-nginx #查看 ingress-nginx namespace的 部署情况
kubectl logs -f ingress-nginx-controller-744f6d5bdf-tl6g4 -n ingress-nginx # 查看 ingress-nginx-controller 的 日志情况
4.4 测试访问
直接访问 kube-node-2的 ip 即可，因为 ingress-nginx-controller 默认是 监听 80端口，由于上面的 nodeSelector: #选择 node label 中有 app=ingress的节点进行部署 ,而 kube-node-2 是被打了标签的节点node
可以看到 其实就是一个 nginx
5.部署一个 tomcat 测试 Ingress-nginx
通过部署一个tomcat ，测试Ingress-nginx的代理 是否生效
5.1 编写 deploy-tomcat.yaml
主要编写
Deployment 部署tomcat:8.0-alpine，
Service 暴露 tomcat pod
一个 Ingress 资源它规定 访问 tomcat.demo.com 这个域名的 所有请求 / 都转发到 tomcat-demo Service 上
IngressClass 新版本提供的资源 ，用于在定义 Ingress资源的时候 指定，在集群中有多个 Ingress controller 的时候很有用处
apiVersion: apps/v1
kind: Deployment
metadata:
name: tomcat-demo
spec:
selector:
matchLabels:
app: tomcat-demo
replicas: 1
template:
metadata:
labels:
app: tomcat-demo
spec:
containers:
- name: tomcat-demo
image: tomcat:8.0-alpine
ports:
- containerPort: 8080
---
apiVersion: v1
kind: Service
metadata:
name: tomcat-demo
spec:
selector:
app: tomcat-demo #选择 tomcat-demo pod
ports:
- port: 80 #对外暴露 80 端口
protocol: TCP
targetPort: 8080 # tomcat 端口
---
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
name: tomcat-demo
spec:
defaultBackend:
service:
name: default-http-backend #！！！ 指定 默认的backend服务
port:
number: 80
ingressClassName: nginx #！！！重点 需要指定 哪个 IngressClass 可以看上面的 deploy.yaml 最后定义的
rules:
- host: tomcat.demo.com #所有的 tomcat.demo.com请求都转发到 Service tomcat-demo
http:
paths:
- pathType: Prefix
path: "/"
backend:
service:
name: tomcat-demo
port:
number: 80
---
#定义一个 default-http-backend 当没有被Ingress规定的请求 负载给 它
apiVersion: apps/v1
kind: Deployment
metadata:
name: default-http-backend
labels:
app: default-http-backend
spec:
replicas: 1
selector:
matchLabels:
app: default-http-backend
template:
metadata:
labels:
app: default-http-backend
spec:
terminationGracePeriodSeconds: 60
containers:
- name: default-http-backend
# Any image is permissible as long as:
# 1. It serves a 404 page at /
# 2. It serves 200 on a /healthz endpoint
image: registry.cn-hangzhou.aliyuncs.com/google_containers/defaultbackend:1.4
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
labels:
app: default-http-backend
spec:
ports:
- port: 80
targetPort: 8080
selector:
app: default-http-backend
5.2 部署 tomcat + ingress + default-http-backend
部署上面的文件 即可
查看 部署情况 可以看到都是Running 了
5.3 测试 通过Ingress-nginx 能否访问到tomcat
由于我们 ingress 资源配置的 域名 是 tomcat.demo.com ，所以我需要把它添加到 宿主机的hosts 文件中，如下
那么按照预期，当我访问 tomcat.demo.com 的时候其实就是访问 192.168.56.22 上的 ingress-nginx-controller 这个nginx，那么根据 ingress 的 资源的设定 它会把请求 转发到 Service tomcat-demo 上，从而访问到 tomcat 界面
当我访问 api.demo.com 的时候 由于没有对这个域名进行处理 那么会默认把请求转发到 default-http-backend 上
访问 tomcat.demo.com
访问 api.demo.com
总结
至此在k8s 1.23.5上 已经成功部署了 Ingress-nginx ，并且通过部署一个tomcat服务测试了 Ingress-nginx 已经代理成功了，由于不管是 k8s 新版本和 Ingress-nginx 新版本都有些变化 所有很些坑，是我从官网不断摸索的，下面总结一下坑点
image 镜像需要自己从docker hub 上准备好 ，或者直接修改Ingress-nginx 的 deploy.yaml
k8s.gcr.io/ingress-nginx/controller:v1.1.2
k8s.gcr.io/ingress-nginx/kube-webhook-certgen:v1.1.1
重要！新版本中 提供了 IngressClass ，需要在编写 Ingress 的时候指定
把 ingress-nginx-controller 使用 hostNetwork: true 进行部署 比 NodePort 减少一层转发，但是需要指定 选择打了标签的 node nodeSelector: app: ingress
通过 Ingress spec.defaultBackend 指定 默认服务，并且需要保持在同一个 namespace
spec:
defaultBackend:
service:
name: default-http-backend #！！！ 指定 默认的backend服务
port:
number: 80
vscode k8s 插件 快捷生成Depoyment 的时候 自定添加了资源限制，导致部署tomcat的时候 总是启动不起来..
导致tomcat pod 状态 CrashLoopBackOff，从而导致 通过 Ingress-nginx 无法访问到tomcat
resources:
limits:
memory: "128Mi" #不够部署tomcat 内存
cpu: "500m"
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