K8S nginx能正常运行，但是 curl 访问 Connection refused,怎么解决？
centos7.5 k8s 一个k8s-master,两个节点：k8s-slave1, k8s-slave2
# master执行：
$ kubectl run test-nginx --image=nginx:alpine
$ kubectl get po -o wide
# 能正常运行
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
test-nginx-5bd8859b98-qvks5 1/1 Running 0 29s 172.17.0.2 k8s-slave2 <none> <none>
$ curl 172.17.0.2
curl: (7) Failed connect to 172.17.0.2:80; Connection refused
# 但是k8s-slave2节点，$ curl 172.17.0.2是能通的，但是在master和别的节点上就curl不通。
[root@k8s-slave2 ~]# curl 192.169.165.181:30960
curl: (7) Failed connect to 192.169.165.181:30960; Connection refused
[root@k8s-slave2 ~]#
[root@k8s-slave2 ~]# curl 172.17.0.2
<!DOCTYPE html>
<html>
<head>
Thank you for using nginx.
[root@k8s-master ~]# curl 172.17.0.2
curl: (7) Failed connect to 172.17.0.2:80; Connection refused
[root@k8s-master ~]# ping 172.17.0.2
PING 172.17.0.2 (172.17.0.2) 56(84) bytes of data.
64 bytes from 172.17.0.2: icmp_seq=1 ttl=64 time=0.096 ms
64 bytes from 172.17.0.2: icmp_seq=2 ttl=64 time=0.037 ms
[root@k8s-slave1 ~]# curl 172.17.0.2
curl: (7) Failed connect to 172.17.0.2:80; No route to host
# 三台机器的防火墙都是ACCEPT，没有问题：
iptables -L -n
Chain FORWARD (policy ACCEPT)
# 网络也是好的：
[root@k8s-master ~]# netstat -rn
Kernel IP routing table
Destination Gateway Genmask Flags MSS Window irtt Iface
0.0.0.0 192.168.165.2 0.0.0.0 UG 0 0 0 ens33
172.17.0.0 0.0.0.0 255.255.0.0 U 0 0 0 docker0
192.168.165.0 0.0.0.0 255.255.255.0 U 0 0 0 ens33
# 所有节点都是ready状态，镜像都已经安装了
[root@k8s-master ~]# kubectl get nodes
NAME STATUS ROLES AGE VERSION
k8s-master Ready master 10h v1.16.2
k8s-slave1 Ready <none> 10h v1.16.2
k8s-slave2 Ready <none> 10h v1.16.2
[root@k8s-master ~]# kubectl get pod -n kube-system
NAME READY STATUS RESTARTS AGE
coredns-58cc8c89f4-29t99 1/1 Running 1 10h
coredns-58cc8c89f4-nkbqf 1/1 Running 1 10h
etcd-k8s-master 1/1 Running 1 10h
kube-apiserver-k8s-master 1/1 Running 1 10h
kube-controller-manager-k8s-master 1/1 Running 1 10h
kube-proxy-6dvpv 1/1 Running 2 10h
kube-proxy-6mbrd 1/1 Running 1 10h
kube-proxy-9cwrv 1/1 Running 1 10h
kube-scheduler-k8s-master 1/1 Running 1 10h
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