How to find OS of an EC2 instance using AWS CLI

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How can you find out the OS running on an EC2 instance using AWS CLI.

The ec2 describe-instance command spits out a lot of information , but there is n

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天涯浪人

2020-12-10 08:22

Try this command:

aws ec2 describe-images --image-ids $(aws ec2 describe-instances --instance-ids i-xxxxxxxxxxxxx --query 'Reservations[0].Instances[0].ImageId' --output text) --query 'Images[0].Name'

$() part gets the ImageId using InstanceId.

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感动是毒

2020-12-10 08:25

Here's a quick way to list the Platform field, which at least distinguishes between Windows and Linux:

aws ec2 describe-instances --query 'Reservations[*].Instances[*].[InstanceId,Platform]' --output text
i-78b4ef47  windows
i-b8ae3386  windows
i-9d3611a2  None
i-1c57c651  windows
i-a241ec91  None
i-7d26b630  None

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长发绾君心

2020-12-10 08:29

If you have a System Manager agent install on your instances you can use DescribeInstanceInformation API to find that information:

$ aws ssm describe-instance-information --query 'InstanceInformationList[*].[InstanceId,PlatformType,PlatformName]' --output text | sort

i-016073859e4b31111 Linux   Amazon Linux AMI
i-01fa3efe71e4b1111 Linux   Amazon Linux AMI
i-03d437d24f7341111 Windows Microsoft Windows Server 2012 R2 Standard
i-048fa3ba0aa151111 Windows Microsoft Windows Server 2012 R2 Standard
i-05e27c562eb881111 Linux   Amazon Linux AMI
i-09283c3c05d551111 Windows Microsoft Windows Server 2012 R2 Standard
i-0a51eb40351911111 Linux   Amazon Linux AMI
i-0a5aeab8f56ba1111 Linux   Amazon Linux AMI
i-0a61968dc51ba1111 Linux   Amazon Linux AMI
i-0a84d5b23e5251111 Linux   Amazon Linux AMI
i-0b057729594791111 Windows Microsoft Windows Server 2012 R2 Standard
i-0b1d0a7fb339b1111 Linux   Amazon Linux AMI
i-0da2fefde50351111 Linux   Amazon Linux AMI
i-0eafb22a9581a1111 Linux   Amazon Linux AMI

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暗喜

2020-12-10 08:29

You can't query the specific OS of the instance from the AWS cli but you can query the AMI that the instance is based off of. Also, you can't get an 'OS' attribute but you can get the Description or Name of the AMI, so if you create your AMIs with a meaningful description you can make it work.

$ aws ec2 describe-images --image-ids "ami-xxxxxxxx"
{
    "Images": [
        {
            "VirtualizationType": "paravirtual", 
            "Name": "amazon-linux-20130509", 
            "Tags": [
                {
                    "Value": "amazon-linux-20130509", 
                    "Key": "Name"
                }
            ], 
            "Hypervisor": "xen", 
            "ImageId": "ami-xxxxxxxx", 
            "RootDeviceType": "ebs", 
            "State": "available", 
            "BlockDeviceMappings": [
                {
                    "DeviceName": "/dev/sda1", 
                    "Ebs": {
                        "DeleteOnTermination": true, 
                        "SnapshotId": "snap-xxxxxxxx", 
                        "VolumeSize": 100, 
                        "VolumeType": "standard"
                    }
                }
            ], 
            "Architecture": "x86_64", 
            "ImageLocation": "123456789012/amazon-linux-20130509", 
            "KernelId": "aki-fc37bacc", 
            "OwnerId": "123456789012", 
            "RootDeviceName": "/dev/sda1", 
            "Public": false, 
            "ImageType": "machine", 
            "Description": "Amazon Linux"
        }
    ]
}

If you want to get more detailed you can always write your own script to ssh into the machines and run cat /etc/issue in each one of them.

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