RequestedRegion

IAMの条件でリージョンごとに場合分けできる

例

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Sid": "InstanceConsoleReadOnly",
            "Effect": "Allow",
            "Action": [
                "ec2:Describe*",
                "ec2:Export*",
                "ec2:Get*",
                "ec2:Search*"
            ],
            "Resource": "*"
        },
        {
            "Sid": "InstanceWriteRegionRestricted",
            "Effect": "Allow",
            "Action": [
                "ec2:Associate*",
                "ec2:Import*",
                "ec2:Modify*",
                "ec2:Monitor*",
                "ec2:Reset*",
                "ec2:Run*",
                "ec2:Start*",
                "ec2:Stop*",
                "ec2:Terminate*"
            ],
            "Resource": "*",
            "Condition": {
                "StringEquals": {
                    "aws:RequestedRegion": [
                        "eu-west-1",
                        "eu-west-2",
                        "eu-west-3"
                    ]
                }
            }
        }
    ]
}   

docs.aws.amazon.com

dev.classmethod.jp