Tag latest not found in repository docker.io/library/centos on Redhat Enterprise Linux behind proxy server
<p>I have installed and pulled from docker.io successfully many times on Redhat Enterprise Linux. But now I am having a very difficult time with a slightly different environment behind a proxy server.</p>

<p>I am starting to think there is a modification Redhat has done to the docker packages preventing my proxy setting from working correctly. When I try to do a simple "docker pull centos", I get the frustrating error: "Tag latest not found in repository docker.io/library/centos".  I have tried other tags as well with no luck. Before I put the proxy setting in, I received "authorizationrequired" messages. I got past that by adding the proxy info to /etc/sysconfig/docker. Then I received x509 errors. I got past that by adding the appropriate certificate file to docker. Now, with everything seemingly correct, I am unable to do a simple pull. From what I can tell, this is not an issue with stock docker. Is there something else that needs to be done to make the redhat docker package work with a proxy? Any help is greatly appreciated. I tried everything in <a href="https://stackoverflow.com/questions/23111631/cannot-download-docker-images-behind-a-proxy">another stackoverflow question</a> to no avail.</p>

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