What should I do if there is no communication between docker on the host?

What should I do if the docker on the host cannot communicate?

Problems: The internal network of the docker host is normal, and other The host's connection fails, other hosts cannot connect to the port mapped on the docker host, and docker cannot connect to external hosts.

The server environment is as follows:

The system is centos

docker info:

WARNING: IPv4 forwarding is disabled

WARNING: bridge-nf-call-iptables is disabled

WARNING: bridge-nf-call-ip6tables is disabled

Resolve host The method to solve the problem of communication between docker on the computer is as follows:

1. Edit the configuration file

vim /etc/sysctl.conf

Add the following code in the file

net.bridge.bridge-nf-call-ip6tables=1
net.bridge.bridge-nf-call-iptables=1
net.bridge.bridge-nf-call-arptables=1
net.ipv4.ip_forward=1

2. Restart the network

systemctl restart network

Check docker info again, the warning disappears, and the docker network on the host returns to normal.

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