CentOS-6.4下搭建Rails环境
（1）安装Rails

1）安装需要的Package

# yum -y install gcc
# yum -y install gcc-c++
# yum -y install zlib zlib-devel
# yum -y install readline readline-devel
# yum -y install openssl openssl-devel

最好是 #yum install gcc gcc-c++ openssl* readline* ncurses* zlib* libxml* libjpeg* libpng* libxslt* libtool*

2）安装Ruby

# cd /usr/local/src
# wget ftp://ftp.ruby-lang.org/pub/ruby/2.0/ruby-2.0.0-p247.tar.gz
# tar zxvf ruby-2.0.0-p247.tar.gz
# cd ruby-2.0.0-p247
# ./configure
# make
# make install
# ruby -v

3）更新Gem

# gem update --system
# gem -v

4）安装Rails

# gem install rdoc
# gem install rails
# rails -v

5）卸载Ruby

# cd /usr/local/src/ruby-2.0.0-p247
# cat .installed.list | xargs rm

常见问题

1）问题1（NoMethodError：openssl）


缺什么装什么
# yum install gcc-c++
# yum install curl-devel
# yum install httpd-devel
# yum install apr-devel
# yum install apr-util-devel

再次执行
# passenger-install-apache2-module


3）设置Apache

/etc/httpd/conf/httpd.conf


# yum install sqlite-devel
# cd testapp/
# bundle install

5）创建Scaffold

# rails g scaffold friend name:string address:string
# rake db:create RAILS_ENV=production
# rake db:migrate RAILS_ENV=production
# rake assets:precompile RAILS_ENV=production

6）启动服务

# setenforce 0
# /etc/init.d/httpd restart

http://localhost/friends


（３）Nginx+Unicorn

1）安装Nginx

# rpm -ivh http://nginx.org/packages/centos/6/noarch/RPMS/nginx-release-centos-6-0.el6.ngx.noarch.rpm
# yum install nginx

# /etc/init.d/nginx start


2）安装unicorn

# gem install unicorn

3）创建测试工程

省略，和以上步骤相同

4）设置Unicorn

# cd /var/www/rails/testapp/config/
# wget -O unicorn.rb https://raw.github.com/defunkt/unicorn/master/examples/unicorn.conf.rb

修改模板文件，并创建相应的文件夹
config/unicorn.rb


5）启动服务

# unicorn_rails -c config/unicorn.rb -E production -p 5000 -D
# /etc/init.d/nginx restart

http://localhost:5000/friends


6）设置Ngnix

/etc/nginx/nginx.conf


http://localhost/friends


常见问题
1）问题1（Could not find a JavaScript runtime.）

将CoffeeScript编译成JavaScript需要JavaScript的runtime，
不像Windows或Mac OS X 默认已经有Javascript引擎，Linux下需要安装。
# gem install execjs
# gem install therubyracer
实际是libv8，也可以安装nodejs。JRuby用户更多的使用therubyrhino

2）问题排查2（PassengerWatchdog: Permission denied.）
开启SELinux
# setenforce 0

3）问题排查3（SQLite3::ReadOnlyException:attempt to write a readonly database）
SQLite的数据库文件权限不足
# chmod 777 /db
# chmod 777 databasefilename
# chown user.user databasefilename