Docker Swarm vs Vagrant: What are the differences?
What is Docker Swarm? Native clustering for Docker. Turn a pool of Docker hosts into a single, virtual host. Swarm serves the standard Docker API, so any tool which already communicates with a Docker daemon can use Swarm to transparently scale to multiple hosts: Dokku, Compose, Krane, Deis, DockerUI, Shipyard, Drone, Jenkins... and, of course, the Docker client itself.
What is Vagrant? A tool for building and distributing development environments. Vagrant provides the framework and configuration format to create and manage complete portable development environments. These development environments can live on your computer or in the cloud, and are portable between Windows, Mac OS X, and Linux.
Docker Swarm and Vagrant are primarily classified as "Container" and "Virtual Machine Management" tools respectively.
"Docker friendly" is the primary reason why developers consider Docker Swarm over the competitors, whereas "Development environments" was stated as the key factor in picking Vagrant.
Docker Swarm and Vagrant are both open source tools. Vagrant with 18.6K GitHub stars and 3.74K forks on GitHub appears to be more popular than Docker Swarm with 5.63K GitHub stars and 1.11K GitHub forks.
According to the StackShare community, Vagrant has a broader approval, being mentioned in 802 company stacks & 479 developers stacks; compared to Docker Swarm, which is listed in 83 company stacks and 38 developer stacks.
What is Docker Swarm?
What is Vagrant?
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"The best way to ensure that local testing was possible was to normalize people’s dev environments. For this we chose Vagrant. This, combined with Chef, allows us to do our local dev in sandboxed Linux instances running locally via VirtualBox in a configuration as similar to production as possible. In addition to making dev environment setup much easier than it used to be, this ensures that each engineer has a consistent environment that is ready to run tests out of the box. The user SSHs into the local linux server and runs spec commands like they would on their host OS, and generally everything Just Works. Most people on our team combine this with Zeus, which allows the Rails environment to be preloaded for lightning fast (relatively speaking) test runs. Both Vagrant and Zeus have their share of issues, but in practice we’ve found them to be a huge time saver."
Not blazing fast but we pick Vagrant for all our projects because the console mode without gui leads to a low consumption of ram memory making it the best way for DevOps ready environment requiring less configuration.
Vagrant allows me to ensure that anyone I'm collaborating with will be able to test my web application in the same environment. I also use Vagrant to setup VMs that I can use to refine my Capistrano recipes.
We use Virtualbox in combination with Vagrant during development to ensure a consistent test/development environment. This helps to reduce the number of defects when our software goes to production.