Amazon ec2 packer构建AmazonChroot-简单示例不起作用

我正在尝试使用Packer构建Amazon AMI centos。我正在使用AmazonChrootBuilder

ami存在，但是我得到了构建错误

[root@ip-10-32-11-16 retel-base]# packer build retel-base.json 
amazon-chroot output will be in this color.

==> amazon-chroot: Gathering information about this EC2 instance...
==> amazon-chroot: Inspecting the source AMI...
==> amazon-chroot: Couldn't find root device!
Build 'amazon-chroot' errored: Couldn't find root device!

==> Some builds didn't complete successfully and had errors:
--> amazon-chroot: Couldn't find root device!

==> Builds finished but no artifacts were created.

---

cat retel-base.json

{
"variables": {
"ACCESS_KEY_ID": "{{env `ACCESS_KEY_ID`}}",
"SECRET_ACCESS_KEY": "{{env `SECRET_ACCESS_KEY`}}"
},
"builders": [{
"type": "amazon-chroot",
"access_key": "{{user `ACCESS_KEY_ID`}}",
"secret_key": "{{user `SECRET_ACCESS_KEY`}}",
"source_ami":"ami-a40df4cc",
"ami_name": "base image built with packer {{timestamp}}"
}]

---

}

我认为这可能与根设备的名称和块设备映射不匹配有关

在官方的CentOS AMIs中，根设备名为

/dev/sda

，但块设备映射仅列出

/dev/sda1

，这显然是根设备上的分区

---

Netflix的Aminator在分区卷方面也有类似的问题：

好的，那么我在这里有什么地方做错了吗？我可以再试一次。在他们当前的状态下，该AMI与Packer不兼容。我不知道如何把它转换成一个真实的。你可以试试别的。