How to lunch 100 and more servers in Chef : i am new to chef 
i have successfully configured chef workstation and server 

so by using this below  command i can be able to launch only one instance 

knife ec2 server create –image ami-cc5af9a5 -i ram.pem –flavor m1.small -x root –groups chef-client -Z us-east-1a -r “role[webserver]”

By this command i can bootstrap only one node

knife ec2 server create –image ami-a4827dc9 -i NVirginia.pem –flavor t2.micro -x root –groups RC-Corporation -Z us-east-1a -r “role[learn_chef_httpd]”


So hear i want to launch&Bootstrap 100 and more instance so where i have to customize these commands 