安装过程要求使用ec2服务器，但我想在自己的虚拟ubuntu 16.04服务器上安装edx分析。我遵循这些说明https://openedx.atlassian.net/wiki/spaces/OpenOPS/pages/43385371/edX+Analytics+Installation
在这里安装过程要求ece（/aws/tasks/main.yml）
#
# Start dealing with Jumbo frames issue in mixed MTU deployements in AWS
#
- name: Gather ec2 facts for use in other roles
action: ec2_metadata_facts
no_log: False
tags:
- deploy
该过程失败，并出现以下错误。
TASK [aws : Gather ec2 facts for use in other roles] *******************************************************
An exception occurred during task execution. To see the full traceback, use -vvv. The error was: KeyError: '
fatal: [localhost]: FAILED! => {"changed": false, "module_stderr": "Traceback (most recent call last):\n Fi"/tmp/ansible_vSMq7O/ansible_module_ec2_metadata_facts.py\", line 541, in main\n ec2_metadata_facts = Ec2n\n data['ansible_ec2_placement_region'] = data['ansible_ec2_instance_identity_document_region']\nKeyErro}