Amazon ec2 AWS EC2 CentOS 7 Usardata文件在初始引导时无法加载

我正在尝试将简单的bash脚本传递给AWS CentOS 7实例。用户数据如下所示：

#!/bin/bash
yum update -y

以下是cloud init日志的一个片段：

Apr  1 19:03:01 ip-172-20-60-102 cloud-init: /usr/bin/env: bash  yum update -y : No such file or directory
Apr  1 19:03:01 ip-172-20-60-102 cloud-init: 2016-04-01 19:03:01,604 - util.py[WARNING]: Failed running /var/lib/cloud/instance/scripts/part-001 [127]
Apr  1 19:03:01 ip-172-20-60-102 cloud-init: 2016-04-01 19:03:01,616 - cc_scripts_user.py[WARNING]: Failed to run module scripts-user (scripts in /var/lib/cloud/instance/scripts)
Apr  1 19:03:01 ip-172-20-60-102 cloud-init: 2016-04-01 19:03:01,617 - util.py[WARNING]: Running scripts-user (<module 'cloudinit.config.cc_scripts_user' from '/usr/lib/python2.7/site-packages/cloudinit/config/cc_scripts_user.pyc'>) failed

我犯了不同的错误：

Apr  1 19:28:17 ip-172-20-60-102 cloud-init: 2016-04-01 19:28:17,450 - __init__.py[WARNING]: Unhandled non-multipart (text/x-not-multipart) userdata: '"UserData" : { "Fn::Base...'
Apr  1 19:28:20 ip-172-20-60-102 cloud-init: Cloud-init v. 0.7.5 running 'modules:config' at Fri, 01 Apr 2016 19:28:20 +0000. Up 48.56 seconds.
Apr  1 19:28:21 ip-172-20-60-102 cloud-init: Cloud-init v. 0.7.5 running 'modules:final' at Fri, 01 Apr 2016 19:28:20 +0000. Up 48.89 seconds.

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使用绝对路径。尝试使用绝对路径。请尝试

/usr/bin/yum-y update

这并没有提供问题的答案。若要评论或要求作者澄清，请在其帖子下方留下评论。-谢谢亲爱的托德。我将答案编辑为真实答案，而不是问题。谢谢你的回答，我按照你的建议尝试了，我得到了相同的错误：这并不能提供问题的答案。若要评论或要求作者澄清，请在其帖子下方留下评论。-谢谢亲爱的托德。我将答案编辑为真实答案，而不是问题。谢谢你的回答，我按照你的建议尝试了，我得到了相同的错误：

Apr  1 19:28:17 ip-172-20-60-102 cloud-init: 2016-04-01 19:28:17,450 - __init__.py[WARNING]: Unhandled non-multipart (text/x-not-multipart) userdata: '"UserData" : { "Fn::Base...'
Apr  1 19:28:20 ip-172-20-60-102 cloud-init: Cloud-init v. 0.7.5 running 'modules:config' at Fri, 01 Apr 2016 19:28:20 +0000. Up 48.56 seconds.
Apr  1 19:28:21 ip-172-20-60-102 cloud-init: Cloud-init v. 0.7.5 running 'modules:final' at Fri, 01 Apr 2016 19:28:20 +0000. Up 48.89 seconds.