今天线上打镜像发现编译机出问题了，查看了pod发现k8s的nginx-ingress一直在crash，于是查看了日志，发现一直在报：
2022/03/02 02:43:29 [emerg] 36#36: bind() to 0.0.0.0:80 failed (98: Address already in use) 2022/03/02 02:43:29 [emerg] 36#36: bind() to 0.0.0.0:80 failed (98: Address already in use) 2022/03/02 02:43:29 [emerg] 36#36: bind() to 0.0.0.0:80 failed (98: Address already in use) 2022/03/02 02:43:29 [emerg] 36#36: bind() to 0.0.0.0:80 failed (98: Address already in use) 2022/03/02 02:43:29 [emerg] 36#36: bind() to 0.0.0.0:80 failed (98: Address already in use) 2022/03/02 02:43:29 [emerg] 36#36: bind() to 0.0.0.0:80 failed (98: Address already in use) 2022/03/02 02:43:29 [emerg] 36#36: bind() to 0.0.0.0:80 failed (98: Address already in use) 2022/03/02 02:43:29 [emerg] 36#36: bind() to 0.0.0.0:80 failed (98: Address already in use) 2022/03/02 02:43:29 [emerg] 36#36: bind() to 0.0.0.0:80 failed (98: Address already in use) 2022/03/02 02:43:29 [emerg] 36#36: bind() to 0.0.0.0:80 failed (98: Address already in use) 2022/03/02 02:43:29 [emerg] 36#36: bind() to 0.0.0.0:80 failed (98: Address already in use) 2022/03/02 02:43:29 [emerg] 36#36: bind() to 0.0.0.0:80 failed (98: Address already in use) 2022/03/02 02:43:29 [emerg] 36#36: bind() to 0.0.0.0:80 failed (98: Address already in use) 2022/03/02 02:43:29 [emerg] 36#36: bind() to 0.0.0.0:80 failed (98: Address already in use) 2022/03/02 02:43:29 [emerg] 36#36: bind() to 0.0.0.0:80 failed (98: Address already in use) 2022/03/02 02:43:29 [emerg] 36#36: bind() to 0.0.0.0:80 failed (98: Address already in use) 2022/03/02 02:43:29 [emerg] 36#36: bind() to 0.0.0.0:80 failed (98: Address already in use) 2022/03/02 02:43:29 [emerg] 36#36: bind() to 0.0.0.0:80 failed (98: Address already in use) 2022/03/02 02:43:29 [emerg] 36#36: bind() to 0.0.0.0:80 failed (98: Address already in use) 2022/03/02 02:43:29 [emerg] 36#36: bind() to 0.0.0.0:80 failed (98: Address already in use) 2022/03/02 02:43:29 [emerg] 36#36: bind() to 0.0.0.0:80 failed (98: Address already in use) 2022/03/02 02:43:29 [emerg] 36#36: bind() to 0.0.0.0:80 failed (98: Address already in use) 2022/03/02 02:43:29 [emerg] 36#36: bind() to 0.0.0.0:80 failed (98: Address already in use) 2022/03/02 02:43:29 [emerg] 36#36: bind() to 0.0.0.0:80 failed (98: Address already in use) 2022/03/02 02:43:29 [emerg] 36#36: bind() to 0.0.0.0:80 failed (98: Address already in use) 2022/03/02 02:43:29 [emerg] 36#36: bind() to 0.0.0.0:80 failed (98: Address already in use) 2022/03/02 02:43:29 [emerg] 36#36: bind() to 0.0.0.0:80 failed (98: Address already in use) 2022/03/02 02:43:29 [emerg] 36#36: bind() to 0.0.0.0:80 failed (98: Address already in use) 2022/03/02 02:43:29 [emerg] 36#36: bind() to 0.0.0.0:80 failed (98: Address already in use) 2022/03/02 02:43:29 [emerg] 36#36: bind() to 0.0.0.0:80 failed (98: Address already in use) 2022/03/02 02:43:29 [emerg] 36#36: bind() to 0.0.0.0:80 failed (98: Address already in use) 2022/03/02 02:43:29 [emerg] 36#36: bind() to 0.0.0.0:80 failed (98: Address already in use) 2022/03/02 02:43:29 [emerg] 36#36: bind() to 0.0.0.0:80 failed (98: Address already in use) 2022/03/02 02:43:29 [emerg] 36#36: bind() to 0.0.0.0:80 failed (98: Address already in use) 2022/03/02 02:43:29 [emerg] 36#36: bind() to 0.0.0.0:80 failed (98: Address already in use) 2022/03/02 02:43:29 [emerg] 36#36: bind() to 0.0.0.0:80 failed (98: Address already in use) 2022/03/02 02:43:29 [emerg] 36#36: bind() to 0.0.0.0:80 failed (98: Address already in use) 2022/03/02 02:43:29 [emerg] 36#36: bind() to 0.0.0.0:80 failed (98: Address already in use) 2022/03/02 02:43:29 [emerg] 36#36: bind() to 0.0.0.0:80 failed (98: Address already in use) 2022/03/02 02:43:29 [emerg] 36#36: bind() to 0.0.0.0:80 failed (98: Address already in use) 2022/03/02 02:43:29 [emerg] 36#36: still could not bind() W0302 02:43:32.515637 7 controller.go:220] Dynamic reconfiguration failed: Post http+unix://nginx-status/configuration/backends: read unix @->/tmp/nginx-status-server.sock: read: connection reset by peer
发现有其他进程占用了80端口，导致nginx-ingress一直绑定不上，最后crash了。
使用命令
sudo netstat -ntlp | grep :80
发现是kube-proxy占用了80端口，那么剩下的问题就简单了，将kube-proxy所在的pod删除就行。
kubectl delete pod kube-proxy-xxxx -n kube-system
相对的如果是其他进程占用了80端口，那么也可以直接kill -9 pid即可
