Vagrant is a tool designed to create and configure lightweight, reproducible, and portable development environments. It leverages a declarative configuration file which describes all software requirements, packages, operating system configuration, and users.
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Salt
Score 6.2 out of 10
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Built on Python, Salt is an event-driven automation tool and framework to deploy, configure, and manage complex IT systems. Salt is used to automate common infrastructure administration tasks and ensure that all the components of infrastructure are operating in a consistent desired state.
If you're writing software, particularly software that depends on other services (web servers or databases for example) then Vagrant is great. I know some people skip Vagrant and just set up virtual machines on their own, but I've found that Vagrant streamlines the process nicely and makes it easy to update or swap out versions. If you're a web developer (which I am) it's amazing. I can have several boxes configured for my different projects and I just spin them up or down based on what I'm working on. One scenario where this might not be ideal is if you're running Vagrant on a computer that has limited resources. Since you're running a virtual machine with its own operating system and such you'll want a host computer with enough RAM, hard drive space and CPU to run the virtual machine properly without killing the performance of the host. The virtual disks can also take up a lot of space if you're not careful so if you have many virtual machines provisioned and don't clean up the old ones that you're not using, you may find that your hard drive is full. Each of my Linux servers take up about 10GB of disk space.
Managing heterogeneous environments of large numbers of nodes, especially nodes which may need sudden changes (security updates, for instance), or frequent replacement, is a strength for Saltstack. Simplicity is not a strength for Saltstack. In a homogenous environment (all CentOS 7, for example, with no Debian or Windows) I might recommend using Ansible instead - it is less flexible and granular, but simpler to configure.
Easy to create machines with different OS's, list of them can be found from Vagrant's website with configuration details.
Flexible configuration, user can determine what software will be pre-installed to machine. Saves time because it doesn't need to be done manually every time.
Easily manage full environments, not just single machines, with single command.
A superb remote execution framework! SaltStack allows us to easily program numerous functions on top of it. For example, we developed a fast parallel asynchronous deployment tool that handles all software deployment, including interdependent service management.
Configuration management is now easy. We take advantage of this to automate (in tandem with AWS tools) the stand-up of all servers and services. It is also relatively easy to create new configuration management states for software not yet supported by the community (e.g. Grafana).
Flexibility. Numerous small utilities have been built which simply wrap around SaltStack to allow tedious tasks to become easy.
Learning curve is steep - It can be challenging for someone to set up initially. After some coaching, the basics come pretty quickly though.
Relies on external Virtual Machine applications - It would be great if Vagrant itself could run the virtual machine instead of leaning on other virtualization software. This is a small detail, but would make setup simple.
We haven't had to spend a lot of time talking to support, and we've only had one issue, which, when dealing with other vendors is actually not that bad of an experience.
Docker has a few advantages, especially with the disk size bloat brought on by Vagrant's hosting an entire OS and project in a VM. It relies on native tools, however, and may not support every software. Vagrant provides uniformity, efficiency and repeatability within team work and for deployment and testing.
I've used shell scripts over ssh, custom in-house deployment tools, Chef, and SaltStack. I've evaluated Ansible, but I was never happy with performance over SSH. Chef's loose configuration data model and lack of philosophy and conventions around use makes it difficult for a team to share responsibility for configuration code. Needing to use additional tools to do orchestration for cross-host/agent dependency relationships made me look for more. SaltStack, while not as mature when I first tried it, impressed me with its speed and elegant design
