docker啟動容器發現端口是tcp6，導致無法訪問

1. 問題背景

[root@dc02 ~]# sudo docker run -p 5601:5601 -p 9200:9200 -p 5044:5044 -it --name elk elk:v2
WARNING: IPv4 forwarding is disabled. Networking will not work.  * Starting periodic command scheduler cron                                                                       [ OK ] 
 * Starting Elasticsearch Server                                                                                  [ OK ] 

在瀏覽器中無法訪問

2. 解決辦法

[root@dc02 log]# vim  /usr/lib/sysctl.d/00-system.conf
加入一行
net.ipv4.ip_forward=1

重啟網絡
[root@dc02 log]# systemctl restart network

測試網絡連通性
[root@dc02 log]# ping baidu.com
PING baidu.com (123.125.115.110) 56(84) bytes of data.
64 bytes from 123.125.115.110: icmp_seq=1 ttl=128 time=3.61 ms
64 bytes from 123.125.115.110: icmp_seq=2 ttl=128 time=2.73 ms

重啟docker
[root@dc02 log]# systemctl restart docker.service