查找 AWS 实例运行的是 Amazon Linux 1 还是 2？

Question

In AWS I need to add amazon linux instance to domain based on this article . However how do i know which Amazon Linux version the instance is using. I do not have access to AWS console. But i do have access to actual instance. What linux command i should be using.

I use uname -srm command which returns Linux 4.4.0-1057-aws x86_64

Not sure if this is Amazon Linux 1 or Amazon Linux 2

Answer 1

You can use /etc/os-release file to get the info about Amazon Linux Version, the machine is running.

1. In case of Amazon 1

    [ec2-user@ip-xxx- ~]$ cat /etc/os-release NAME="Amazon Linux AMI" VERSION="2018.03" ID="amzn" ID_LIKE="rhel fedora" VERSION_ID="2018.03" PRETTY_NAME="Amazon Linux AMI 2018.03" ANSI_COLOR="0;33" CPE_NAME="cpe:/o:amazon:linux:2018.03:ga" HOME_URL="http://aws.amazon.com/amazon-linux-ami/"

2. In case of Amazon 2

    [ec2-user@xxxx ~]$ cat /etc/system-release Amazon Linux release 2.0 (2017.12) LTS Release Candidate [ec2-user@fresh-amazon-host ~]$ cat /etc/os-release NAME="Amazon Linux" VERSION="2.0 (2017.12)" ID="amzn" ID_LIKE="centos rhel fedora" VERSION_ID="2.0" PRETTY_NAME="Amazon Linux 2.0 (2017.12) LTS Release Candidate" ANSI_COLOR="0;33" CPE_NAME="cpe:2.3:o:amazon:amazon_linux:2.0" HOME_URL="https://amazonlinux.com/"

As you can clearly see the two different versions, mentioned as Amazon Linux and Amazon Linux 2.0

Answer 2

$ cat /etc/system-release

or

$ cat /etc/issue

or

$ uname -a

and head for https://aws.amazon.com/amazon-linux-ami/

Answer 3

You can use the following command:

rpm -E %{rhel} 

For Operating System: Amazon Linux 2

The answer is: 7

Answer 4

Here's a one-liner.

awk -F '[="]*' '/^PRETTY_NAME/ { print $2 }' < /etc/os-release 

It prints out:

Amazon Linux 2

Answer 5

Well, the announcement in: https://aws.amazon.com/about-aws/whats-new/2017/12/introducing-amazon-linux-2 states that it uses a 4.9 kernel. Yours is older, so I would say it is Linux 1.

Still, the following call from the terminal should give you the AMI ID and you could do a search on that(see docs at https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-instance-metadata.html ):

curl http://169.254.169.254/latest/meta-data/ami-id