VyOS is an open source network operating system based on Debian GNU/Linux.
VyOS provides a free routing platform that competes directly with other commercially available solutions from well known network providers. Because VyOS is run on standard amd64, i586 and ARM systems, it can be used as a router and firewall platform for cloud deployments.
We use multiple live versions of our manual hosted thankfully by https://readthedocs.org. We will provide one version of the manual for every VyOS major version starting with VyOS 1.2 which will receive Long-term support (LTS).
The manual version is selected/specified by its Git branch name. You can switch between versions of the documentation by selecting the appropriate branch on the bottom left corner.
VyOS CLI syntax may change between major (and sometimes minor) versions. Please always refer to the documentation matching your current, running installation. If a change in the CLI is required, VyOS will ship a so called migration script which will take care of adjusting the syntax. No action needs to be taken by you.