You can use this to inject existing data into the container, as well as capture (and reload) data as a container creates it. It is essentially a symlink between the container and a folder on your host machine (on your mac). It can be shared across multipe containers. This is a layer that can hold data, and persists even when a container is deleted. When we destroy a container, the data is lost.Įnter the Volume. So, we use a container, not really the image directly. If we want to make changes, and install new things, we build a new image, using the old one as a foundation.Ĭontainers hold an image, and allow read/write on top. However, they are the guts of the system. They can't be changed, because they can be shared among multiple containers.

In Docker, we have some building blocks to create our system. The Building Blocks: Containers, Images, and Volumes Since OSX Yosemite, they even run more natively, and don't require VirtualBox or Parallels. In linux, these containers run natively, making them more usable in Production environments, as well as on your developer machine. We set up each separately, then use docker-compose to get them talking together. Instead of one package for an entire system, a LAMP stack would have Apache, PHP and MySQL in their own containers. Unlike Vagrant, Docker builds containers around each major piece of the system, so they can be reused. Docker is just like Vagrant, in that it is a virtual machine you can use to setup servers.

Docker for mac yosemite won't start