How do I create docker image from an existing CentOS?

I am new to docker.io and not sure if this is beyond the scope of docker. I have an existing CentOS 6.5 system. I am trying to figure out how to create a docker image from a CentOS Linux system I already have running. I would like to basically clone this existing system; so I can port it to another cloud provider. I was able to create a docker image from a base CentOS image but I want to basically clone my existing system and use docker.io going forward.

Am I stuck with creating a base CentOS from scratch and configure it for docker from there? This might be more of a VirtualBox/Vagrant thing, but am interested in docker.io.

  • Magento 2 on docker - no css loaded
  • Remote debugging NodeJS Container on AWS
  • How can I customize a yum .repo file in a Dockerfile so it can be used as a source when installing packages?
  • docker out of disk space
  • create web app with php and docker
  • Docker unable to perform login against SSO / Federation Services via Apache & Shibboleth modules
  • Looks like I need to start with base CentOS and create a Dockerfile with all the addons I need… Think I’m getting there now….

  • Access web server over https in a Docker container
  • two applications used in docker swarm
  • Cannot connect to SQL Server from a Docker container
  • rsyslog unable to identify docker container id as hostname from log4j 1x
  • Persistent volumes in docker engine swarm mode across multiple nodes
  • Assigning vhosts to Docker ports
  • One Solution collect form web for “How do I create docker image from an existing CentOS?”

    Cloning a system that is up and running is certainly not what Docker is intended for. Instead, Docker is meant to develop your OS and server installation together with the app or service, making DevOps even more DevOpsy. By starting with a clean CentOS image, you will be sure to install only what you need for the service, and have everything under control. You actually don’t want all the other stuff that might produce incompatibilities. So, the answer here is that you definitely should approach the problem here the other way around.

    Docker will be the best open platform for developers and sysadmins to build, ship, and run distributed applications.