Question

The following warning is given when docker runs the container ⚠️：

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

Solution:

# modify configuration
echo "net.ipv4.ip_forward=1" >> /etc/sysctl.conf

# restart network
systemctl restart network

# Check
sysctl net.ipv4.ip_forward
# net.ipv4.ip_forward = 1

# restart docker
systemctl restart docker

Then restart the container ^_^ …