我有以下几点 recipe/default.rb 厨师长：

# Create empty RSA password
template "#{node[:cluster][:ubuntu]}/my_key.pem" do
   source "keys.pem.erb"
   mode 0400
   owner "ubuntu"
   group "ubuntu"
end
bash "ssh-passwordless" do
   user "ubuntu"
   cwd "#{node[:cluster][:ubuntu]}"
   code <<-EOF
   eval `ssh-agent -s`
   ssh-add #{node[:cluster][:ubuntu]}/my_key.pem
   EOF
end
# Create empty RSA password
execute "ssh-keygen" do
  command "sudo -u ubuntu ssh-keygen -q -t rsa -N '' -f /home/ubuntu/.ssh/id_rsa"
  creates "/home/ubuntu/.ssh/id_rsa"
 action :run
end
# Copy public key to node1; if key doesn't exist in authorized_keys, append it to this file
execute <<EOF
cat /home/ubuntu/.ssh/id_rsa.pub | sudo -u ubuntu ssh ubuntu@localhost "(cat > /tmp/tmp.pubkey; mkdir -p .ssh; touch .ssh/authorized_keys; grep #{node[:fqdn]} .ssh/authorized_keys > /dev/null || cat /tmp/tmp.pubkey >> .ssh/authorized_keys; rm /tmp/tmp.pubkey)

正如你所看到的，我尝试了很多方法来让它工作，然而，到目前为止没有一个成功。目标是在ec2中消除对password/pem文件的需要，这样我就可以建立一个hadoop集群。我怎样才能做到呢？