Sharing Vagrant project files over Dropbox
Why would you want to share vagrant project files over Dropbox? What are Vagrant project files anyway?
Vagrant is a way to automatically manage virtualbox vms on your local machine. I use vagrant primarily to give me clean linux environments in which to run my rails projects. Since I’m on windows and windows doesn’t run rails very well as of right now, it makes developing much more pleasurable.
The nice thing about vagrant is that it’s project-centered, meaning it stores its configuration in the project directory (text files which are separate from the vm its managing. The vm disks are still in vb’s normal folder). This directory gets shared into the vm, so if I also stick my rails project in a subfolder, the same files are visible to both the vm and my local system. Thus I can work on the rails files with my familiar local editor and have the results show up instantly in the linux vm which is my run-time environment.
Of course, I work on more than one machine, moving from work to my home machine to my laptop. If I’m in the middle of something, I want that work to follow me as well, which is why I use dropbox.
Dropbox is great at syncing small files. However, vms pose a problem because even a small change means resyncing an entire disk, which is time-prohibitive. What I want is for my project files to be synced automatically while keeping the run-time environment (the vm) separate. Vagrant makes it easy to set up nearly identical run-time environments on all of my machines without requiring me to sync the actual vms over dropbox. Even the vagrant configurations get synced because they are just text files.
Of course, the resulting vms do get out of sync because they aren’t exactly the same files. If I install any software after booting the machine, it won’t be installed elsewhere unless I also visit and install on the other machines. The solution to this is to add the software to my template machine and repackage with vagrant, then download it to my other machines. Since the effort of getting the rails project up and running on a brand new vm is minimal, it’s easy just to destroy and recreate the vms based on the new template.
The data in the database can also get out of sync. Fortunately I’m working with sample datasets in development most of the time, so it’s automatically generated in an identical fashion and doesn’t matter too much anyway. But when I need real store data for debugging purposes, for example, it’s usually not a big deal to do a mysqldump to a text file and just put that in the project directory as well, so it’s automatically synced to my other machines. I’m not working with big datasets, so that works fine. I just have to remember to reimport to mysql whenever I change data and switch machines.
I also have to make sure that virtualbox is the same version on each
machine so that they don’t fight over which version of guest additions
to install (I have the auto-updating turned on through
So far so good. The one issue that’s been difficult to solve, however,
is that whenever I create a vm on one machine, then do the same on
another, virtualbox is unaware of the vm on the original machine and
assigns a new machine uuid to the vm. Vagrant stores this uuid in the
project directory in the
.vagrant file. Thus, when I go back to the
first machine, the machine uuid of the original vm has been overwritten
and lost, so it can’t find the existing vm and creates a new one. This
makes a perpetual cycle of losing the existing machine’s uuid between
To solve this, you need to get your various machines to agree on a machine uuid for the vagrant vm. Here’s my method.
Create the vm on your first machine with
vagrant haltthe vm
In the project directory, make a copy of
Create the vm on your second machine with
vagrant haltthe vm
Open the original
.vagrant(the one you copied) file in a text editor and copy the uuid (minus any quotes)
This should look like
85a3496f-b51e-407b-b270-d0c7fbee2b01(but not that exact one, look for the one in your file)
Don’t mix up the vm uuid for the disk uuid
Copy the original
.vagrantover the new one, overwriting it
Make sure there are no virtualbox processes running - VBoxSVC.exe is one that tends to stick around for a while after you close virtualbox, so make sure it’s gone
In your home directory, find
.Virtualbox\Virtualbox.xmland open in a text editor
MachineRegistrykey with the same name as your project and replace the uuid with your copied one
In the virtualbox vms folder (usually
VirtualBox VMsin your home directory), find your machine folder with your project name and open
[project name].vboxin a text editor
- Note there will be a random number tagged onto your project name
VirtualBox/Machinekey and replace the uuid attribute with the one you copied
You only need to do this on the machine with the second vm, since you’re pasting the uuid that the first is already configured with.
Before trying to start the new vm, verify that the uuid has taken
effect. Use the
vboxmanage command to list the vms:
If you get a message about the vm being inaccessible, there was probably a virtualbox process sticking around that overwrote one or both of the files you changed. Check them again and if the uuid has changed, fix it.
You should now be able to start the vm on either machine without losing your existing vm.