Set Docker_Opts in centos

Question

I need to set docker to listen to tcp://0.0.0.0/4243 on my host machine running amazon linux (centos). All the documentation I have seen has told me to run the following command

Answer 1

I am working on centos 7.

I just want to add insecure-registry in docker config file then I changed "DOCKER_OPTS=--insecure-registry=...." in /etc/sysconfig/docker while it did not work.

While I saw a INSECURE_REGISTRY in the config so I changed this variable and it WORKS!

So I guess DOCKER_OPTS does not work here!

But it worked on my unbuntu 14!

It is really frustrating when using docker!