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我试图建立从样品通过AWS http://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/quickref-ecs.html样品AWS EC2容器服务云的形成模板失败
堆栈开始创建cluser /服务/任务等精细提供叠层，只是它利己注册EC2容器到我的集群和堆栈创建最终失败。
挖到/var/log/cloud-init-ouput.log我觉得这
+ yum install -y aws-cfn-bootstrap
Loaded plugins: priorities, update-motd, upgrade-helper
One of the configured repositories failed (Unknown),
and yum doesn't have enough cached data to continue. At this point the only
safe thing yum can do is fail. There are a few ways to work "fix" this:
1. Contact the upstream for the repository and get them to fix the problem.
2. Reconfigure the baseurl/etc. for the repository, to point to a working
upstream. This is most often useful if you are using a newer
distribution release than is supported by the repository (and the
packages for the previous distribution release still work).
3. Disable the repository, so yum won't use it by default. Yum will then
just ignore the repository until you permanently enable it again or use
--enablerepo for temporary usage:
yum-config-manager --disable <repoid>
4. Configure the failing repository to be skipped, if it is unavailable.
Note that yum will try to contact the repo. when it runs most commands,
so will have to try and fail each time (and thus. yum will be be much
slower). If it is a very temporary problem though, this is often a nice
compromise:
yum-config-manager --save --setopt=<repoid>.skip_if_unavailable=true
Cannot find a valid baseurl for repo: amzn-main/latest
Could not retrieve mirrorlist http://repo.ap-southeast-2.amazonaws.com/latest/main/mirror.list error was
12: Timeout on http://repo.ap-southeast-2.amazonaws.com/latest/main/mirror.list: (28, 'Connection timed out after 10001 milliseconds')
看来尽管堆栈正在部署，它无法访问网络做了百胜安装。 通过ssh连接到框和运行
yum install -y aws-cfn-bootstrap
的作品就好了。
任何线索什么会阻止堆栈在部署时访问网络？