si usa la solución descrita aquí entonces esto me puso en marcha:
01_enable_rootaccess:
command: echo Defaults:root \!requiretty >> /etc/sudoers
02_install_mongo:
- command: yum install -y mongo-10gen-server
+ command: yum install -y mongo-10gen-server mongodb-org-mongos
ignoreErrors: true
03_turn_mongod_off:
command: sudo chkconfig mongod off
