Docker networking issue - IPV4 forwarding is disabled error and Fix

During docker build, faced the following error:

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

So, all yum install commands failed.

Fix:

Added the following to /etc/sysctl.conf:

net.ipv4.ip_forward=1

Then restarted the network service.

Now, docker build should be able to reach the network.

Note to self:

Next, time keep an eye on all the warnings faced during docker build itself :)