This is mostly just a bunch of links to various things from the video as well as an example Vagrantfile and shell script for provisioning. The shell script in this case installs both Docker and Node.js.
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Vagrant Plugins - A rich and varied set of plugins for Vagrant, including ones to setup/teardown VMs on different services like DigitalOcean, Vultr, and Amazon, to automatically register your new Vagrant instance in the DNS, and lots more.
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ngrok - Used only if you install the Vagrant share plugin.
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DigitalOcean Vagrant Plugin - Another plugin, designed to let you bring up, halt, destroy, etc. DigitalOcean Droplets using Vagrant exactly as you do with local VMs.