Rails5

docker(ubuntu18.04)にrails環境を作る
apt-get update
apt-get install rbenv
apt-get install build-essential libssl-dev libreadline-dev zliblg-dev git

gem install rails

$ git clone https://github.com/rbenv/rbenv.git ~/.rbenv
$ git clone https://github.com/rbenv/ruby-build.git ~/.rbenv/plugins/ruby-build
$ echo 'export PATH="$HOME/.rbenv/bin:$PATH"' >> ~/.bash_profile
$ ~/.rbenv/bin/rbenv init  # 出力される指示に従う
eval "$(rbenv init -)"
$ source ~/.bash_profile
rbenv install 2.5.3
gem install rails

Node.js

$ curl -sL https://deb.nodesource.com/setup_8.x | sudo -E bash –
$ sudo apt-get install -y nodejs