I use Capistrano (https://github.com/capistrano/capistrano https://github.com/capistrano/capistrano) for our deployments for zero downtime. It's rails heavy (an

I use Capistrano (https://github.com/capistrano/capistrano https://github.com/capistrano/capistrano) for our deployments for zero downtime. It's rails heavy (and requires ruby) but with tinkering I've also gotten it to deploy my Node and Go apps. The versioning system is great too, if a deploy is bad, you can simply cap rollback, which will revert the changes.