K8s和Nginx：[emerg] bind到[::]：80失败98：使用中的地址

问题描述

大家好！

我需要以下问题的帮助。 所以我的项目是在裸机上使用nginx容器的k8s。

我有从makefile构建的Docker容器：

FROM alpine
RUN apk update
RUN apk add nginx vim net-tools bash
COPY start.sh ./tmp/start.sh
COPY nginx.conf ./tmp
RUN mv -f /tmp/nginx.conf /etc/nginx/nginx.conf
RUN mkdir -p www/test.com
COPY index.html ./tmp
RUN mv -f /tmp/index.html /www/test.com/index.html

EXPOSE 80 443

ENTRYPOINT nginx -g "daemon off;"

我的nginx配置：

events {
  worker_connections  1024;
}
http {
    server {
        listen [::]:80;
    
        server_name test.com www.test.com;
        root /www/test.com;
        index index.html;

        location / {
                   autoindex on;
                   autoindex_exact_size off;
                   autoindex_localtime on;
                  }
    }
}

具有此配置的此容器是稳定的，因此在以下情况下：

 docker build --tag nginx_img .
 docker run -it -p80:80 nginx_img 

本地主机正在工作。

之后，我想将此容器放入k8s。我用的是MetalLB。

我的nginx服务+部署（nginx.yaml）：

apiVersion: v1
kind: Service
metadata:
  name: my-nginx
  labels:
    run: my-nginx
spec:
  type: LoadBalancer
  ports:
  - port: 80
    protocol: TCP
  selector:
    run: my-nginx
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: my-nginx
spec:
  selector:
    matchLabels:
      run: my-nginx
  replicas: 1
  template:
    metadata:
      labels:
        run: my-nginx
    spec:
      containers:
      - name: nginx-container
        image: nginx_img
        imagePullPolicy: Never
        ports:
        - containerPort: 80

最后，启动脚本：

minikube start

#Nginx deployment
cd srcs/nginx
eval $(minikube docker-env)
docker build --tag nginx_img .
kubectl apply -f nginx.yaml
cd ../..

#Dashboard install
kubectl apply -f https://raw.githubusercontent.com/kubernetes/dashboard/v2.0.0/aio/deploy/recommended.yaml
kubectl apply -f srcs/dashboard-adminuser.yaml
kubectl apply -f srcs/dashboard-cluster.yaml

#MetalLB install
kubectl apply -f https://raw.githubusercontent.com/metallb/metallb/v0.9.3/manifests/namespace.yaml
kubectl apply -f https://raw.githubusercontent.com/metallb/metallb/v0.9.3/manifests/metallb.yaml
kubectl apply -f srcs/metalLB/metallb-config.yaml

kubectl proxy

所以在此之后，我有以下信息：

xserg:~/Desktop/ft_services_tmp$ kubectl get nodes
NAME       STATUS   ROLES    AGE     VERSION
minikube   Ready    master   3h59m   v1.18.3
xserg:~/Desktop/ft_services_tmp$ kubectl get pods
NAME                        READY   STATUS    RESTARTS   AGE
my-nginx-74dc86d4cb-69dks   1/1     Running   0          31m
xserg:~/Desktop/ft_services_tmp$ kubectl get svc
NAME         TYPE           CLUSTER-IP      EXTERNAL-IP       PORT(S)        AGE
kubernetes   ClusterIP      10.96.0.1       <none>            443/TCP        32m
my-nginx     LoadBalancer   10.110.233.84   192.168.100.100   80:31860/TCP   31m

因此外部地址为192.168.100.100，但是站点不可用。代理输出：

2020/10/05 14:38:24 http: proxy error: context canceled

pod中的数据：

xserg:~/Desktop/ft_services_tmp$ kubectl exec -it my-nginx-74dc86d4cb-69dks -- bash
bash-5.0# nginx
nginx: [emerg] bind() to [::]:80 failed (98: Address in use)
nginx: [emerg] bind() to [::]:80 failed (98: Address in use)
nginx: [emerg] bind() to [::]:80 failed (98: Address in use)
nginx: [emerg] bind() to [::]:80 failed (98: Address in use)
nginx: [emerg] bind() to [::]:80 failed (98: Address in use)
nginx: [emerg] still could not bind()
bash-5.0# netstat
Active Internet connections (w/o servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State      
Active UNIX domain sockets (w/o servers)
Proto RefCnt Flags       Type       State         I-Node   Path
unix  3      [ ]         STREAM     CONNECTED     243830   
unix  3      [ ]         STREAM     CONNECTED     243831
bash-5.0# netstat -tulpn
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name    
tcp6       0      0 :::80                   :::*                    LISTEN      1/nginx: master pro

所以，我不知道出了什么问题？没有任何服务使用端口80。几天来我试图解决它，但是现在我什么都没有了。

PS。我试过听80；或听80；听[::]：80 ipv6only = on;

解决方法

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