[Solved] Error(22) WARNING: IPv4 forwarding is disabled. Networking will not work.

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 ^_^

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