Amazon EC2 实例无法更新或使用 yum [英] Amazon EC2 instance can't update or use yum

问题描述

我正在使用亚马逊的安装 LAMP 服务器的教程.前几条指令涉及使用 yum，但我尝试过的每一种方法都产生了相同的消息.我最近发现了一些关于同一问题的其他问题，这些问题都没有改变我的设置.

I am using Amazon's tutorial for installing a LAMP server. The first several instructions involve using yum, but every single way I have tried to do it has resulted in the same message. I have found a few other recent questions about the same issue, none of which change anything on my setup.

这里是消息:

Loaded plugins: priorities, update-motd, upgrade-helper
Could not retrieve mirrorlist http://repo.us-east-1.amazonaws.com/latest/main/mirror.list error was
12: Timeout on http://repo.us-east-1.amazonaws.com/latest/main/mirror.list: (28, 'Connection timed out after 10001 milliseconds')


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

我之前使用相同的教程做过同样的事情，没有遇到任何问题，但这是几个月前的事情.我不知道发生了什么变化，但我微薄的经验让我无法弄清楚.

I have done this same thing before without running into any problems, using the same tutorial, but it was several months ago. I don't know what has changed but my meager experience is keeping me from figuring it out.

推荐答案

看起来主机在联系 yum 服务器时遇到问题.确保实例具有出站 Internet 访问权限(检查安全组等).如果实例在 VPC 中并且安全组看起来不错，您可能需要使用 nat 设备或附加弹性 IP.

Looks like the host is having trouble contacting the yum server. Make sure the instance has outbound internet access (check security groups etc). If the instance is in a VPC and the security groups look good you may need to use a nat appliance or attach an elastic IP.

祝你好运-

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