Backtrack5中metasploit安装pg(Metasploit now requires version 0.11 or higher of the 'pg' gem for ...)

最近更新Metasploit后，启动时出现如下错误：

[-] ***
[-] *
[-] * Metasploit now requires version 0.11 or higher of the 'pg' gem for database support
[-] * There a three ways to accomplish this upgrade:
[-] * 1. If you run Metasploit with your system ruby, simply upgrade the gem:
[-] *    $ rvmsudo gem install pg
[-] * 2. Use the Community Edition web interface to apply a Software Update
[-] * 3. Uninstall, download the latest version, and reinstall Metasploit
[-] *
[-] ***
[-]
[-]
[-] Failed to connect to the database: Please install the postgresql adapter: `gem install activerecord-postgresql-adapter` (RubyGem version error: pg(0.9.0 not ~> 0.11)

这个错误说明msf使用的pg版本过低，但是由于Backtrack中有两个ruby版本，一个是系统自带的，一个是msf自带的。所以我们要确保更新的是msf使用的那个ruby环境中的pg。只需在msf启动之后执行安装pg即可。

msf > gem install pg
[*] exec: gem install pg

Building native extensions.  This could take a while...
Successfully installed pg-0.13.2
1 gem installed
Installing ri documentation for pg-0.13.2...
Installing RDoc documentation for pg-0.13.2...