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What's the best approach?

(Project73) #1

let’s say the site gets busy and it needs another node
configure dockerfile to create base image (centos 6.5, nginx, php-fpm) first then download the php script?
or just upload an image with everything on it and just pull one huge file for each instance?

(Sven Dowideit) #2

There’s not very much difference between the 2 approaches wrt total data downloaded.

The Docker image you build with a Dockerfile (and pull/push) is made of layers - starting with the base (in your case centos:6.5) layer.

Layers that are shared between images will only be downloaded once, so using a common Docker registry (or the Docker Hub) will mean that more of your images will have common bases.

Also, by pulling from a registry, you know that each node is running the same version of the same code - if your Dockerfile pulls libraries from the internet, rebuilding on each node may not result in identical nodes.

To my mind - using a registry and pulling images to nodes is the best way to manage deployment :smile: