Ruby On Rails

安装

安装ruby

安装sqlite3

 sudo apt-get install sqlite3
 sudo apt-get install libsqlite3-dev

安装rails
```
 gem install rails
 rails --version
```
使用rails创建博客
```
 rails new blog
```
启动web服务器
```
 cd blog
 bin/rails server
```

错误及处理

/var/lib/gems/2.3.0/gems/bundler-1.16.1/lib/bundler/runtime.rb:84:in `rescue in block (2 levels) in require': There was an error while trying to load the gem 'uglifier'. (Bundler::GemRequireError)
Gem Load Error is: Could not find a JavaScript runtime. See https://github.com/rails/execjs for a list of available runtimes.
Backtrace for gem load error is:
/var/lib/gems/2.3.0/gems/execjs-2.7.0/lib/execjs/runtimes.rb:58:in `autodetect'
/var/lib/gems/2.3.0/gems/execjs-2.7.0/lib/execjs.rb:5:in `<module:ExecJS>'
/var/lib/gems/2.3.0/gems/execjs-2.7.0/lib/execjs.rb:4:in `<top (required)>'
/var/lib/gems/2.3.0/gems/uglifier-4.1.1/lib/uglifier.rb:5:in `require'
/var/lib/gems/2.3.0/gems/uglifier-4.1.1/lib/uglifier.rb:5:in `<top (required)>'
/var/lib/gems/2.3.0/gems/bundler-1.16.1/lib/bundler/runtime.rb:81:in `require'
/var/lib/gems/2.3.0/gems/bundler-1.16.1/lib/bundler/runtime.rb:81:in `block (2 levels) in require'
/var/lib/gems/2.3.0/gems/bundler-1.16.1/lib/bundler/runtime.rb:76:in `each'
/var/lib/gems/2.3.0/gems/bundler-1.16.1/lib/bundler/runtime.rb:76:in `block in require'
/var/lib/gems/2.3.0/gems/bundler-1.16.1/lib/bundler/runtime.rb:65:in `each'
/var/lib/gems/2.3.0/gems/bundler-1.16.1/lib/bundler/runtime.rb:65:in `require'
/var/lib/gems/2.3.0/gems/bundler-1.16.1/lib/bundler.rb:114:in `require'
/home/ez/blog/config/application.rb:7:in `<top (required)>'
/var/lib/gems/2.3.0/gems/railties-5.1.4/lib/rails/commands/server/server_command.rb:133:in `require'
...
...

原因：没有JavaScript runtime
解决方法：sudo apt-get install nodejs