User names for connecting to AWS EC2 instances via SSH

Recently, I got chance to work with various Linux distributions on Amazon AWS EC2 instances. When creating EC2 instance, normally we will select AMI & AWS done all other tasks.

It never ask for a user name. But when I start to communicate with my server via SSH, the user name is essential.

So here is a small list that show the official AMI SSH user name for various Linux distributions in AWS EC2.

OS / Distro User name
Amazon Linux ec2-user
Ubuntu ubuntu
Debian admin
RHEL 6.4 and later ec2-user
RHEL 6.3 and earlier root
Fedora ec2-user
Centos centos
SUSE root
BitNami bitnami
TurnKey root
NanoStack ubuntu
FreeBSD ec2-user
OmniOS root

Some AMIs are configured like when we start a SSH communication with root will output a message informing us the correct user to use and then close the connection. For example,

$ ssh root@<my_ip>
Please login as the user "ubuntu" rather than the user "root".

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