1、编译安装ruby-2.3.1时
需要先安装libyaml、libyaml-devel
2、 安装gem install rake
ERROR: Loading command: install (LoadError)
cannot load such file -- zlib
ERROR: While executing gem ... (NoMethodError)
undefined method `invoke_with_build_args' for nil:NilClass
安装zlib-devel后，进入ruby源码文件夹
安装ruby自身提供的zlib包
#cd ext/zlib
#ruby ./extconf.rb
#make
#make install
ERROR: While executing gem ... (Gem::Exception)
Unable to require openssl, install OpenSSL and rebuild ruby (preferred) or use non-HTTPS sources
yum -y install openssl-devel
yum -y install openssl
将ruby 源码目录下的include 目录软链接到 / 目录下：
ln -s /...../ruby-2.2.3/include /
编译安装：make && make install
3、gem install rmagick 出错时
yum install ImageMagick-devel
4、Gem::LoadError: Specified 'mysql' for database adapter, but the gem is not loaded. Add `gem 'mysql'` to your Gemfile (and ensure its version is at the minimum required by ActiveRecord).
在Gemfile 添加 gem "mysql" 然后执行 bundle install
5、LoadError: libmysqlclient.so.18: cannot open shared object file: No such file or directory
解决方案 /alidata/server/mysql-5.6.21/lib 写入 /etc/ld.so.conf 然后运行ldconfig重建/etc/ld.so.cache
6、ActionView::Template::Error (incompatible character encodings: UTF-8 and ASCII-8BIT)
解决方案：config/database.yml 下的 adpter修改mysql2
