Docker : ipv4 Forwarding is disabled

When a Linux OS (such as Cent OS) image is used in Docker, ipv4 forwarding is disabled by default.

What does this mean ?

If you need to access the container application via web interface (example apache,nginx, airflow… ) from host machine, you wont be able to do it.

Why ?

To prevent any security vulnerabilities to your docker container.

Solution ?

There is one easy solution to overcome this issue.

Add the following attributes when running docker command.

–net=host

Example:

docker run -it –net=host –name mycentos -p 8080:8080 -p 5555:5555 centos

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