gem 安装jekyll 问题

使用命令：gem install jekyll

gem install jekyll
ERROR:  Could not find a valid gem 'jekyll' (>= 0), here is why:
          Unable to download data from https://rubygems.org/ - SSL_connect returned=1 errno=0 state=SSLv3 read server certificate B: certificate verify failed (https://rubygems.org/specs.4.8.gz)

解决办法：

步骤1：gem sources --remove 
https://rubygems.org
source https://rubygems.org not present in cache
步骤2：gem sources -a http://gems.ruby-china.org/

安装成功：

I:\rubyDevKit>gem sources -a http://gems.ruby-china.org/
http://gems.ruby-china.org/ added to sources

I:\rubyDevKit>gem sources -l
*** CURRENT SOURCES ***

http://gems.ruby-china.org/

I:\rubyDevKit>gem install jekyll
Fetching: safe_yaml-1.0.4.gem (100%)
Successfully installed safe_yaml-1.0.4
Fetching: rouge-1.11.1.gem (100%)
Successfully installed rouge-1.11.1
Fetching: forwardable-extended-2.6.0.gem (100%)
Successfully installed forwardable-extended-2.6.0
******
******
******
Installing ri documentation for addressable-2.5.0
Parsing documentation for jekyll-3.3.1
Installing ri documentation for jekyll-3.3.1
Done installing documentation for safe_yaml, rouge, forwardable-extended, pathutil, mercenary, liquid, kramdown, ffi, rb-inotify, rb-fsevent, listen, jekyll-watch, sass, jekyll-sass-converter, colorator, public_suffix, addressable, jekyll after 59 seconds
18 gems installed

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小结：由于gem源（https://rubygems.org/）请求失败，http://ruby.taobao.org/这个也不行了，http://gems.ruby-china.org/可以用，http后面没有s。