96 lines
3.2 KiB
Markdown
96 lines
3.2 KiB
Markdown
|
---
|
||
|
|
page_title: "Basic Usage - Docker Provider"
|
||
|
|
sidebar_current: "docker-basics"
|
||
|
|
---
|
||
|
|
|
||
|
|
# Docker Basic Usage
|
||
|
|
|
||
|
|
The Docker provider in Vagrant behaves just link any other provider.
|
||
|
|
If you're familiar with Vagrant already, then using the Docker provider
|
||
|
|
should be intuitive and simple.
|
||
|
|
|
||
|
|
The Docker provider _does not_ require a `config.vm.box` setting. Since
|
||
|
|
the "base image" for a Docker container is pulled from the
|
||
|
|
[Docker Index](/v2/docker/images.html) or
|
||
|
|
built from a [Dockerfile](/v2/docker/dockerfiles.html), the box doesn't
|
||
|
|
add much value, and is optional for this provider.
|
||
|
|
|
||
|
|
## Docker Images
|
||
|
|
|
||
|
|
The first method that Vagrant can use to source a Docker container
|
||
|
|
is via an image. This image can be from any Docker registry. An
|
||
|
|
example is shown below:
|
||
|
|
|
||
|
|
<pre class="prettyprint">
|
||
|
|
Vagrant.configure("2") do |config|
|
||
|
|
config.vm.provider "docker" do |d|
|
||
|
|
d.image = "foo/bar"
|
||
|
|
end
|
||
|
|
end
|
||
|
|
</pre>
|
||
|
|
|
||
|
|
When `vagrant up --provider=docker` is run, this will bring up the
|
||
|
|
image `foo/bar`.
|
||
|
|
|
||
|
|
This is useful for extra components of your application that it might
|
||
|
|
depend on: databases, queues, etc. Typically, the primary application
|
||
|
|
you're working on is built with a Dockerfile, or via a container with
|
||
|
|
SSH.
|
||
|
|
|
||
|
|
## Dockerfiles
|
||
|
|
|
||
|
|
Vagrant can also automatically build and run images based on a local
|
||
|
|
Dockerfile. This is useful for iterating on an application locally
|
||
|
|
that is built into an image later. An example is shown below:
|
||
|
|
|
||
|
|
<pre class="prettyprint">
|
||
|
|
Vagrant.configure("2") do |config|
|
||
|
|
config.vm.provider "docker" do |d|
|
||
|
|
d.build_dir = "."
|
||
|
|
end
|
||
|
|
end
|
||
|
|
</pre>
|
||
|
|
|
||
|
|
The above configuration will look for a `Dockerfile` in the same
|
||
|
|
directory as the Vagrantfile. When `vagrant up` is run, Vagrant
|
||
|
|
automatically builds that Dockerfile and starts a container
|
||
|
|
based on that Dockerfile.
|
||
|
|
|
||
|
|
The Dockerfile is rebuilt when `vagrant reload` is called.
|
||
|
|
|
||
|
|
## Host VM
|
||
|
|
|
||
|
|
On systems that can't run Linux containers natively, such as Mac OS X
|
||
|
|
or Windows, Vagrant automatically spins up a "host VM" to run Docker.
|
||
|
|
This allows your Docker-based Vagrant environments to remain portable,
|
||
|
|
without inconsistencies depending on the platform they are running on.
|
||
|
|
|
||
|
|
Vagrant will spin up a single instance of a host VM and run multiple
|
||
|
|
containers on this one VM. This means that with the Docker provider,
|
||
|
|
you only have the overhead of one virtual machine, and only if it is
|
||
|
|
absolutely necessary.
|
||
|
|
|
||
|
|
By default, the host VM Vagrant spins up is
|
||
|
|
[backed by boot2docker](https://github.com/mitchellh/vagrant/blob/master/plugins/providers/docker/hostmachine/Vagrantfile),
|
||
|
|
because it launches quickly and uses little resources. But the host VM
|
||
|
|
can be customized to point to _any_ Vagrantfile. This allows the host VM
|
||
|
|
to more closely match production by running a VM running Ubuntu, RHEL,
|
||
|
|
etc. It can run any operating system supported by Vagrant.
|
||
|
|
|
||
|
|
An example of changing the host VM is shown below. Remember that this
|
||
|
|
is optional, and Vagrant will spin up a default host VM if it isn't
|
||
|
|
specified:
|
||
|
|
|
||
|
|
<pre class="prettyprint">
|
||
|
|
Vagrant.configure("2") do |config|
|
||
|
|
config.vm.provider "docker" do |d|
|
||
|
|
d.vagrant_vagrantfile = "../path/to/Vagrantfile"
|
||
|
|
end
|
||
|
|
end
|
||
|
|
</pre>
|
||
|
|
|
||
|
|
The host VM will be spun up at the first `vagrant up` where the provider
|
||
|
|
is Docker. To control this host VM, use the
|
||
|
|
[global-status command](#)
|
||
|
|
along with global control.
|