- System configuration is managed for you using Docker (you don't need to figure out how to hook up Puppet/Chef/shell scripts)
- You can aggregate log output from all of your containers
- You can model your application as a collection of services - starting, stopping, scaling them etc
- You can ship exactly the same Docker image you use in development to production
More importantly, all this stuff works out of the box by default. Some of these things are possible with Vagrant, but you need to learn and piece together other tools (Puppet, Foreman, etc) to get it all working.
- System configuration is managed for you using Docker (you don't need to figure out how to hook up Puppet/Chef/shell scripts)
- You can aggregate log output from all of your containers
- You can model your application as a collection of services - starting, stopping, scaling them etc
- You can ship exactly the same Docker image you use in development to production
More importantly, all this stuff works out of the box by default. Some of these things are possible with Vagrant, but you need to learn and piece together other tools (Puppet, Foreman, etc) to get it all working.