Create User

useradd --create-home -c "Account to run the something app" something

Eek, reverse it

userdel -r something

SSH Instance Access

Set up an ssh key, and add it to the current user’s authorized keys.

cd
sshgen -f company
# set it up with no password
cat company.pub >> .ssh/authorized_keys
# make sure to save off the public and private keys.  One way: 
aws s3 cp company s3://my-bucket/company
aws s3 cp company.pub s3://my-bucket/company.pub

Location for sudo privs

/etc/sudoers.d/cloud-init

Also helpful: http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/managing-users.html