Could not find a JavaScript runtime

$ bundle exec rake db:migrate
rake aborted!
Could not find a JavaScript runtime. See https://github.com/sstephenson/execjs for a list of available runtimes.

(See full trace by running task with --trace)

 

推荐下面的网址

https://github.com/joyent/node/wiki/installing-node.js-via-package-manager

$curl -sL https://rpm.nodesource.com/setup | bash -

$yum install -y nodejs