Moto に登録されている AMI (Amazon Machine Image) 情報は実際に AWS から取得された値になっていて，頻度高く（毎月）更新されている👌たとえば Moto の us-east-1 リージョンや ap-northeast-1 リージョンで AMI を検索すると Amazon Linux 2023 AMI 2023.7.20250512.0 x86_64 HVM kernel-6.1 が登録されている．
$ docker run --rm -p 5000:5000 --name moto motoserver/moto # バージニア北部 (us-east-1) リージョン $ aws ec2 describe-images --endpoint-url http://localhost:5000 \ --filters "Name=name,Values=al2023-ami-2023.7.20250512.0-kernel-6.1-x86_64" \ --region us-east-1 { "Images": [ { "BlockDeviceMappings": [ { "Ebs": { "DeleteOnTermination": false, "SnapshotId": "snap-80a08054675345fb6", "VolumeSize": 15, "VolumeType": "standard" }, "DeviceName": "/dev/xvda" } ], "Description": "Amazon Linux 2023 AMI 2023.7.20250512.0 x86_64 HVM kernel-6.1", "Hypervisor": "xen", "ImageOwnerAlias": "amazon", "Name": "al2023-ami-2023.7.20250512.0-kernel-6.1-x86_64", "RootDeviceName": "/dev/xvda", "RootDeviceType": "ebs", "Tags": [], "VirtualizationType": "hvm", "ImageId": "ami-0953476d60561c955", "ImageLocation": "None", "State": "available", "OwnerId": "137112412989", "CreationDate": "2025-06-10T14:57:29.000Z", "Public": true, "Architecture": "x86_64", "ImageType": "machine", "KernelId": "None", "RamdiskId": "ari-1a2b3c4d" } ] } # 東京 (ap-northeast-1) リージョン $ aws ec2 describe-images --endpoint-url http://localhost:5000 \ --filters "Name=name,Values=al2023-ami-2023.7.20250512.0-kernel-6.1-x86_64" \ --region ap-northeast-1 { "Images": [ { "BlockDeviceMappings": [ { "Ebs": { "DeleteOnTermination": false, "SnapshotId": "snap-ce820459498b5678a", "VolumeSize": 15, "VolumeType": "standard" }, "DeviceName": "/dev/xvda" } ], "Description": "Amazon Linux 2023 AMI 2023.7.20250512.0 x86_64 HVM kernel-6.1", "Hypervisor": "xen", "ImageOwnerAlias": "amazon", "Name": "al2023-ami-2023.7.20250512.0-kernel-6.1-x86_64", "RootDeviceName": "/dev/xvda", "RootDeviceType": "ebs", "Tags": [], "VirtualizationType": "hvm", "ImageId": "ami-0c1638aa346a43fe8", "ImageLocation": "None", "State": "available", "OwnerId": "137112412989", "CreationDate": "2025-06-10T14:57:29.000Z", "Public": true, "Architecture": "x86_64", "ImageType": "machine", "KernelId": "None", "RamdiskId": "ari-1a2b3c4d" } ] }
仕組みとしては GitHub Actions ワークフロー .github/workflows/data-update_ssm-default-amis.yml で scripts/ssm_get_default_amis.py を実行して，最終的にリージョンごとに Amazon Linux 関連の AMI 情報を moto/ec2/resources/latest_amis/*.json に保存している感じ〜❗️
独自の AMI を登録する
さらに Moto には独自の AMI を登録する仕組みもあって，環境変数 MOTO_AMIS_PATH に JSON ファイルを指定すると自動的にロードされるようになっている👌テストで使うダミーデータとして登録できたりする．
If you require specific AMIs to be available during your tests, you can provide your own AMI definitions by setting the environment variable MOTO_AMIS_PATH to point to a JSON file containing definitions of the required AMIs. No other AMI’s will be loaded if this environment variable is set.
👾 amis.json
サンプルとして Sample-AMI-2025-06 (ami-99999999999999999) という AMI 情報を ~/amis.json に設定しておく．
[ { "ami_id": "ami-99999999999999999", "state": "available", "public": true, "owner_id": "999999999999", "image_location": "None", "sriov": "simple", "root_device_type": "ebs", "root_device_name": "/dev/sda1", "description": "Sample-AMI-2025-06", "image_type": "machine", "platform": "windows", "architecture": "x86_64", "name": "Sample-AMI-2025-06", "virtualization_type": "hvm", "hypervisor": "xen" } ]
そして，以下のように環境変数 MOTO_AMIS_PATH に ~/amis.json を指定して Moto (Server Mode) を起動する．
$ docker run --rm -p 5000:5000 \ --name moto \ -v ~/amis.json:/moto/amis.json \ -e MOTO_AMIS_PATH=/moto/amis.json \ motoserver/moto
すると ~/amis.json が優先的にロードされるため，以下のように Sample-AMI-2025-06 を取得できるようになる❗️
# バージニア北部 (us-east-1) リージョン $ aws ec2 describe-images --endpoint-url http://localhost:5000 \ --region us-east-1 { "Images": [ { "BlockDeviceMappings": [ { "Ebs": { "DeleteOnTermination": false, "SnapshotId": "snap-4cfec037fcda8435e", "VolumeSize": 15, "VolumeType": "standard" }, "DeviceName": "/dev/sda1" } ], "Description": "Sample-AMI-2025-06", "Hypervisor": "xen", "ImageOwnerAlias": "amazon", "Name": "Sample-AMI-2025-06", "RootDeviceName": "/dev/sda1", "RootDeviceType": "ebs", "Tags": [], "VirtualizationType": "hvm", "ImageId": "ami-99999999999999999", "ImageLocation": "None", "State": "available", "OwnerId": "999999999999", "CreationDate": "2025-06-12T16:01:29.000Z", "Public": true, "Architecture": "x86_64", "ImageType": "machine", "KernelId": "None", "RamdiskId": "ari-1a2b3c4d", "Platform": "windows" } ] } # 東京 (ap-northeast-1) リージョン $ aws ec2 describe-images --endpoint-url http://localhost:5000 \ --region ap-northeast-1 { "Images": [ { "BlockDeviceMappings": [ { "Ebs": { "DeleteOnTermination": false, "SnapshotId": "snap-8eb68c280c406e39a", "VolumeSize": 15, "VolumeType": "standard" }, "DeviceName": "/dev/sda1" } ], "Description": "Sample-AMI-2025-06", "Hypervisor": "xen", "ImageOwnerAlias": "amazon", "Name": "Sample-AMI-2025-06", "RootDeviceName": "/dev/sda1", "RootDeviceType": "ebs", "Tags": [], "VirtualizationType": "hvm", "ImageId": "ami-99999999999999999", "ImageLocation": "None", "State": "available", "OwnerId": "999999999999", "CreationDate": "2025-06-12T16:02:17.000Z", "Public": true, "Architecture": "x86_64", "ImageType": "machine", "KernelId": "None", "RamdiskId": "ari-1a2b3c4d", "Platform": "windows" } ] }
