[chef] MangoDb installation on AWS ec2 instances[centOS]

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Hi guys

i'm just out of college doin internship and new bee to AWS and mongoDB sorry 
if
i'm asking silly question.

i tried to Host mongoDB on AWS ec2 instances [used AMI:ami-1bf9de5e] through
chef-solo.
my runlist:

recipe[mongodb::10gen_repo]
recipe[mongodb]

please help me out in Hosting Mongo DB successfully on AWS and OpenStack




Package mongo-10gen-server-2.4.9-mongodb_1.x86_64.rpm is not signed
[2014-01-16T14:35:49+00:00] DEBUG: ---- End output of yum -d0 -e0 -y install
mongo-10gen-server-2.4.9-mongodb_1 ----
[2014-01-16T14:35:49+00:00] DEBUG: Ran yum -d0 -e0 -y install
mongo-10gen-server-2.4.9-mongodb_1 returned 1

================================================================================
Error executing action `install` on resource 'package[mongo-10gen-server]'
================================================================================


Chef::Exceptions::Exec
----------------------
 returned 1, expected 0
---- Begin output of  ----
STDOUT: STDERR:

Package mongo-10gen-server-2.4.9-mongodb_1.x86_64.rpm is not signed
---- End output of  ----



Resource Declaration:
---------------------
# In /var/chef/cookbooks/mongodb/recipes/default.rb

 22: package node[:mongodb][:package_name] do
 23:   action :install
 24:   version node[:mongodb][:package_version]
 25: end
 26:



Compiled Resource:
------------------
# Declared in /var/chef/cookbooks/mongodb/recipes/default.rb:22:in `from_file'

package("mongo-10gen-server") do
  action [:install]
  retries 0
  retry_delay 2
  package_name "mongo-10gen-server"
  version "2.4.9-mongodb_1"
  cookbook_name :mongodb
  recipe_name "default"
end



[2014-01-16T14:35:49+00:00] INFO: Running queued delayed notifications before
re-raising exception
[2014-01-16T14:35:49+00:00] DEBUG: Re-raising exception: 
Chef::Exceptions::Exec
- package[mongo-10gen-server] (mongodb::default line 22) had an error:
Chef::Exceptions::Exec:  returned 1, expected 0
---- Begin output of  ----
STDOUT: STDERR:

Package mongo-10gen-server-2.4.9-mongodb_1.x86_64.rpm is not signed
---- End output of  ----