#安装gems包：net-ssh
#方法名称：get_disk_size
#作用：获取/dev/sda分区的大小
#作者: xiaowei

require ‘net/ssh‘

def get_disk_size(params={})
hostip = params[:hostip]  #
hostuser = params[:hostuser]
hostpasswd = params[:hostpasswd]
command = params[:command]
ssh = Net::SSH.start(hostip,hostuser,:password=>hostpasswd)
ret =  ssh.exec!(command)
ret =~ /disk\s+\/dev\/sda:\s+(\d+\.\d)\s+GB/i
return $1.to_f
end

p get_disk_size(
:hostip => "192.168.255.129",  
:hostuser => "root",
:hostpasswd => "redhat",
:command => "fdisk -l"
)

ruby连接liunx后台返回/dev/sda分区大小