Centos – Install only docker client/cli binaries on centos

One of the concept of Docker is to have the same environment - if you have a different environment in production than dev, then you don't know that it will really work with full total certainty when the application is moved into production.

From docker.com:

Eliminate Environment Inconsistencies

By packaging up the application with its configs and dependencies together and shipping as a container, the application will always work as designed locally, on another machine, in test or production. No more worries about having to install the same configs into a different environment.

That said, of course production and dev will have differences, but that should be mostly in terms of application configuration - for example, the dev instance would not send out emails to customers but rather to a dummy mail box, etc.

I don't think it would be the right thing to do to have so much difference between production and dev as what you go over in your post.

As for the difference between the dev and production configuration (like the example I gave above), I personally see two workable ways of doing it.

1. In Dev, a Dockerfile which overwrite certain configuration of a common base for both production and dev.

2. Your container runs something - starts httpd, etc. The script that starts the process would first pull the config from Git or whatever repository, based on an environment variable (e.g. docker run ... -e RUNAS=PROD ...) - this is what I do. In my case, running a container for Tomcat, the Tomcat start up scripts simply downloads the war file version based on an environment variable (e.g. -e VERSION=current) and pulls from Git the configuration files based on a variable that defines whether it's production or dev (-e RUNAS=DEV).

It seems like you can't access those resources because the DNS are not configured. Check if you have access to them (ping 8.8.8.8) and then configure the DNS for the docker (adding nameserver 8.8.8.8 to /etc/resolv.conf).

Regards