How to configure docker to support ipv4

CentOS7 Docker starts a web service and uses port mapping to report an error:

WARNING: IPv4 forwarding is disabled. Networking will not work.

Find a solution to make the network support IP4

[root@cxt ~]# vi /etc/sysctl.conf

Add the following code:

net.ipv4.ip_forward=1

Restart the network service

[root@cxt ~]# systemctl restart network

View the modification results (ip_forward=1 Indicates success)

[root@cxt ~]# sysctl net.ipv4.ip_forward
net.ipv4.ip_forward = 1

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