安装Rails
检查环境
检查以下三个软件，确保已经安装
代码语言：javascript复制[root@h202 ruby]# ruby -v
ruby 2.3.0p0 (2015-12-25 revision 53290) [x86_64-linux]
[root@h202 ruby]# gem -v
2.5.1
[root@h202 ruby]# sqlite3 --version
3.6.20
[root@h202 ruby]#替换安装源
如果不替换源，会很慢，或者根本没法获取包，因为有墙
代码语言：javascript复制[root@h202 ruby]# gem source -l
*** CURRENT SOURCES ***
https://rubygems.org/
[root@h202 ruby]# time gem sources --add https://gems.ruby-china.org/ --remove https://rubygems.org/
https://gems.ruby-china.org/ added to sources
https://rubygems.org/ removed from sources
real 0m31.666s
user 0m1.624s
sys 0m4.582s
[root@h202 ruby]# gem source -l
*** CURRENT SOURCES ***
https://gems.ruby-china.org/
[root@h202 ruby]# 安装 Rails
代码语言：javascript复制[root@h202 ruby]# gem install rails
Fetching: rack-1.6.4.gem (100%)
Successfully installed rack-1.6.4
Fetching: concurrent-ruby-1.0.1.gem (100%)
Successfully installed concurrent-ruby-1.0.1
Fetching: sprockets-3.6.0.gem (100%)
Successfully installed sprockets-3.6.0
Fetching: thread_safe-0.3.5.gem (100%)
Successfully installed thread_safe-0.3.5
Fetching: tzinfo-1.2.2.gem (100%)
Successfully installed tzinfo-1.2.2
Fetching: i18n-0.7.0.gem (100%)
Successfully installed i18n-0.7.0
Fetching: activesupport-4.2.6.gem (100%)
Successfully installed activesupport-4.2.6
Fetching: mini_portile2-2.0.0.gem (100%)
Successfully installed mini_portile2-2.0.0
Fetching: nokogiri-1.6.7.2.gem (100%)
Building native extensions. This could take a while...
Successfully installed nokogiri-1.6.7.2
Fetching: loofah-2.0.3.gem (100%)
Successfully installed loofah-2.0.3
Fetching: rails-html-sanitizer-1.0.3.gem (100%)
Successfully installed rails-html-sanitizer-1.0.3
Fetching: rails-deprecated_sanitizer-1.0.3.gem (100%)
Successfully installed rails-deprecated_sanitizer-1.0.3
Fetching: rails-dom-testing-1.0.7.gem (100%)
Successfully installed rails-dom-testing-1.0.7
Fetching: rack-test-0.6.3.gem (100%)
Successfully installed rack-test-0.6.3
Fetching: erubis-2.7.0.gem (100%)
Successfully installed erubis-2.7.0
Fetching: builder-3.2.2.gem (100%)
Successfully installed builder-3.2.2
Fetching: actionview-4.2.6.gem (100%)
Successfully installed actionview-4.2.6
Fetching: actionpack-4.2.6.gem (100%)
Successfully installed actionpack-4.2.6
Fetching: sprockets-rails-3.0.4.gem (100%)
Successfully installed sprockets-rails-3.0.4
Fetching: thor-0.19.1.gem (100%)
Successfully installed thor-0.19.1
Fetching: railties-4.2.6.gem (100%)
Successfully installed railties-4.2.6
Fetching: bundler-1.11.2.gem (100%)
Successfully installed bundler-1.11.2
Fetching: arel-6.0.3.gem (100%)
Successfully installed arel-6.0.3
Fetching: activemodel-4.2.6.gem (100%)
Successfully installed activemodel-4.2.6
Fetching: activerecord-4.2.6.gem (100%)
Successfully installed activerecord-4.2.6
Fetching: globalid-0.3.6.gem (100%)
Successfully installed globalid-0.3.6
Fetching: activejob-4.2.6.gem (100%)
Successfully installed activejob-4.2.6
Fetching: mime-types-data-3.2016.0221.gem (100%)
Successfully installed mime-types-data-3.2016.0221
Fetching: mime-types-3.0.gem (100%)
Successfully installed mime-types-3.0
Fetching: mail-2.6.4.gem (100%)
Successfully installed mail-2.6.4
Fetching: actionmailer-4.2.6.gem (100%)
Successfully installed actionmailer-4.2.6
Fetching: rails-4.2.6.gem (100%)
Successfully installed rails-4.2.6
Parsing documentation for rack-1.6.4
Installing ri documentation for rack-1.6.4
Parsing documentation for concurrent-ruby-1.0.1
Installing ri documentation for concurrent-ruby-1.0.1
Parsing documentation for sprockets-3.6.0
Installing ri documentation for sprockets-3.6.0
Parsing documentation for thread_safe-0.3.5
Installing ri documentation for thread_safe-0.3.5
Parsing documentation for tzinfo-1.2.2
Installing ri documentation for tzinfo-1.2.2
Parsing documentation for i18n-0.7.0
Installing ri documentation for i18n-0.7.0
Parsing documentation for activesupport-4.2.6
Installing ri documentation for activesupport-4.2.6
Parsing documentation for mini_portile2-2.0.0
Installing ri documentation for mini_portile2-2.0.0
Parsing documentation for nokogiri-1.6.7.2
Installing ri documentation for nokogiri-1.6.7.2
Parsing documentation for loofah-2.0.3
Installing ri documentation for loofah-2.0.3
Parsing documentation for rails-html-sanitizer-1.0.3
Installing ri documentation for rails-html-sanitizer-1.0.3
Parsing documentation for rails-deprecated_sanitizer-1.0.3
Installing ri documentation for rails-deprecated_sanitizer-1.0.3
Parsing documentation for rails-dom-testing-1.0.7
Installing ri documentation for rails-dom-testing-1.0.7
Parsing documentation for rack-test-0.6.3
Installing ri documentation for rack-test-0.6.3
Parsing documentation for erubis-2.7.0
Installing ri documentation for erubis-2.7.0
Parsing documentation for builder-3.2.2
Installing ri documentation for builder-3.2.2
Parsing documentation for actionview-4.2.6
Installing ri documentation for actionview-4.2.6
Parsing documentation for actionpack-4.2.6
Installing ri documentation for actionpack-4.2.6
Parsing documentation for sprockets-rails-3.0.4
Installing ri documentation for sprockets-rails-3.0.4
Parsing documentation for thor-0.19.1
Installing ri documentation for thor-0.19.1
Parsing documentation for railties-4.2.6
Installing ri documentation for railties-4.2.6
Parsing documentation for bundler-1.11.2
Installing ri documentation for bundler-1.11.2
Parsing documentation for arel-6.0.3
Installing ri documentation for arel-6.0.3
Parsing documentation for activemodel-4.2.6
Installing ri documentation for activemodel-4.2.6
Parsing documentation for activerecord-4.2.6
Installing ri documentation for activerecord-4.2.6
Parsing documentation for globalid-0.3.6
Installing ri documentation for globalid-0.3.6
Parsing documentation for activejob-4.2.6
Installing ri documentation for activejob-4.2.6
Parsing documentation for mime-types-data-3.2016.0221
Installing ri documentation for mime-types-data-3.2016.0221
Parsing documentation for mime-types-3.0
Installing ri documentation for mime-types-3.0
Parsing documentation for mail-2.6.4
Installing ri documentation for mail-2.6.4
Parsing documentation for actionmailer-4.2.6
Installing ri documentation for actionmailer-4.2.6
Parsing documentation for rails-4.2.6
Installing ri documentation for rails-4.2.6
Done installing documentation for rack, concurrent-ruby, sprockets, thread_safe, tzinfo, i18n, activesupport, mini_portile2, nokogiri, loofah, rails-html-sanitizer, rails-deprecated_sanitizer, rails-dom-testing, rack-test, erubis, builder, actionview, actionpack, sprockets-rails, thor, railties, bundler, arel, activemodel, activerecord, globalid, activejob, mime-types-data, mime-types, mail, actionmailer, rails after 613 seconds
32 gems installed
[root@h202 ruby]# echo $?
0
[root@h202 ruby]# rails --version
Rails 4.2.6
[root@h202 ruby]# 
