Packer amazon-chroot builder Error creating root volume: InvalidSnapshot.NotFound: Snapshot does not exist

Question

我有一个有趣的要求，即运行 Packer amazon-chroot 构建一个临时运行的 Packer amazon-ebs 实例，因为生成的 AMI 有一些自定义的根块设备磁盘分区方案。我的 amazon-ebs 实例正在使用两个启动块设备映射，一个用于父 RHEL8 操作系统的根磁盘，以及一个辅助空设备，我想在其中使用 amazon-chroot 构建器加载具有自定义分区的 RHEL8 操作系统。

在调试模式下运行第一个父 Packer amazon-ebs 构建，我可以验证磁盘是否按预期存在于 EC2 实例上。当我在父 EC2 服务器上启动 Packer amazon-chroot build 时，我收到以下错误消息：

...
==> amibuild.amazon-chroot.source-ami: Pausing after run of step 'StepInstanceInfo'. Press enter to continue.
    amibuild.amazon-chroot.source-ami: Found Image ID: ami-0238411fb452f8275
==> amibuild.amazon-chroot.source-ami: Pausing after run of step 'StepSourceAMIInfo'. Press enter to continue.
==> amibuild.amazon-chroot.source-ami: Checking the root device on source AMI...
==> amibuild.amazon-chroot.source-ami: Pausing after run of step 'StepCheckRootDevice'. Press enter to continue.
==> amibuild.amazon-chroot.source-ami: Pausing after run of step 'StepFlock'. Press enter to continue.
==> amibuild.amazon-chroot.source-ami: Pausing after run of step 'StepPrepareDevice'. Press enter to continue.
==> amibuild.amazon-chroot.source-ami: Creating the root volume...
==> amibuild.amazon-chroot.source-ami: Error creating root volume: InvalidSnapshot.NotFound: Snapshot does not exist
==> amibuild.amazon-chroot.source-ami:  status code: 400, request id: f44d58c0-2b7f-4799-94da-371bf2b49651
...

搜索错误消息并没有为我在 amazon-chroot 构建器上测试提供太多可操作的更改。我正在寻找一些关于期望 amazon-chroot 构建器设置的指导，以便将初始 RHEL8 操作系统加载到 EC2 实例的辅助空磁盘上。

以下是我的amazon-ebs和amazon-chroot构建属性的相关设置

亚马逊-ebs

source "amazon-ebs" "parent" {
    skip_create_ami = true
    region = var.aws_region
    source_ami = var.source_ami_id
    ami_users = var.ami_users
    snapshot_users = var.ami_users
    source_ami_filter {
        filters = {
            name = var.source_ami_filter_name
            architecture = "arm64"
            root-device-type = "ebs"
            state = "available"
            virtualization-type = "hvm"
        }
        owners = [ var.source_ami_owners ]
        most_recent = true
    }
    instance_type = "m7g.medium"
    launch_block_device_mappings {
        device_name = "/dev/sda1"
        volume_type = var.volume_type
        volume_size = var.launch_block_device_mappings_volume_size
        delete_on_termination = true
    }
    launch_block_device_mappings {
        device_name = "/dev/sdf"
        volume_type = var.volume_type
        volume_size = var.launch_block_device_mappings_volume_size
        delete_on_termination = true
    }
...

亚马逊chroot

source "amazon-chroot" "source-ami" {
    region = var.aws_region
    source_ami = var.source_ami_id
    ami_users = var.ami_users
    snapshot_users = var.ami_users
    source_ami_filter {
        filters = {
            name = var.source_ami_filter_name
            architecture = "arm64"
            root-device-type = "ebs"
            state = "available"
            virtualization-type = "hvm"
        }
        owners = [ var.source_ami_owners ]
        most_recent = true
    }
    nvme_device_path = "/dev/nvme1n1p"
    device_path = "/dev/sdf"
    root_device_name = "/dev/sda1"
    root_volume_size = var.launch_block_device_mappings_volume_size
    ami_block_device_mappings {
        device_name = "/dev/sdf"
        volume_type = var.volume_type
        volume_size = var.launch_block_device_mappings_volume_size
        delete_on_termination = true
    }
...

注意，我正在为父 EC2 实例使用

m7g.medium

实例类型，它公开了 NVMe 驱动器。我可以通过以下方式验证驱动器是否符合我在父 EC2 实例上的预期：

[root@ip-172-31-77-18 packer]# lsblk
NAME        MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
nvme0n1     259:0    0   10G  0 disk
├─nvme0n1p1 259:1    0  200M  0 part /boot/efi
├─nvme0n1p2 259:2    0  512M  0 part /boot
└─nvme0n1p3 259:3    0  9.3G  0 part /
nvme1n1     259:4    0   10G  0 disk

根据 Packer 文档，我需要设置定义的

nvme_device_path

属性，但我不清楚其他设置。

我还可以在日志中验证 amazon-ebs 和 amazon-chroot 构建是否使用相同的源 AMI：

==> amibuild.amazon-chroot.source-ami: Gathering information about this EC2 instance...
==> amibuild.amazon-chroot.source-ami: Pausing after run of step 'StepInstanceInfo'. Press enter to continue.
    amibuild.amazon-chroot.source-ami: Found Image ID: ami-0238411fb452f8275

和

==> amibuild.amazon-ebs.source-ami: Pausing after run of step 'StepPreValidate'. Press enter to continue.
    amibuild.amazon-ebs.source-ami: Found Image ID: ami-0238411fb452f8275

只是不确定

Error creating root volume: InvalidSnapshot.NotFound: Snapshot does not exist

错误消息的来源或它指的是什么。