shell脚本设置从标签Amazon EC2的主机名 [英] shell script to set amazon ec2 hostname from tags

问题描述

我想从标签名称设置Amazon EC2的主机名

I am trying to set amazon EC2 hostname from the tag "Name"

和发现答案提取标签的实例数据。

And found the answer to extract tags from instance data.

ec2-describe-tags \
  --filter "resource-type=instance" \
  --filter "resource-id=$(ec2-metadata -i | cut -d ' ' -f2)" \
  --filter "key=Name" | cut -f5

结果是：

+------------+--------------+------+--------+
| resourceId | resourceType | key  | value  |
+------------+--------------+------+--------+
| i-1xxxxxxx | instance     | Name | dev200 |
+------------+--------------+------+--------+

我可以看到，我几乎没有，但我如何才能从上面的结果值（dev200）？然后，我可以在使用它：

I can see that I am almost there, but how do I get the value(dev200) from the result above? Then I can use it in:

echo $HOSTNAME > /etc/hostname

P.S。我有实例BASH，但我在庆典文档的完全丧失。可有人点我到正确的段落？

p.s. I have BASH on the instance, but I am completely lost in the bash document. can someone point me to the correct paragraph?

推荐答案

在某些错误和审判，拿到剧本的工作：

After some error and trial, got the script working:

#!/bin/bash
hostname=`ec2-describe-tags --filter "resource-type=instance" \
  --filter "resource-id=$(ec2-metadata -i | cut -d ' ' -f2)" \
  --filter "key=Name" | grep Name`

IFS="|" read -ra NAME <<< "$hostname"
hostname=${NAME[4]}
echo $hostname

用于IFS得到解析成数组的字符串，幸运的是我知道的第4个元素始终是主机名。

Used IFS to get the string parsed into arrays, and luckily I know the 4th element is always the hostname.

EDIT（20-DEC-2012）：在很短的时间，因为这被张贴，几个相关的EC2命令行工具已被修改，和标志改变或去precated（例如，从-i标志上面似乎不再工作ec2metadata的当前版本）。考虑到这一点，这里是命令行脚本，我用来获取当前机器的​​名称标签（不能说的脚本的其余部分）：

EDIT (20-DEC-2012): In the short time since this was posted, several of the relevant ec2 command line tools have been modified, and flags changed or deprecated (e.g., the -i flag from above no longer seems to work on the current version of ec2metadata). Bearing that in mind, here is the command line script I used to get the current machine's "Name" tag (can't speak to the rest of the script):

ec2-describe-tags --filter "resource-type=instance" --filter "resource-id=$(ec2metadata --instance-id)" | awk '{print $5}'

在Debian / Ubuntu的，需要的apt-get安装云-utils的EC2-API工具来得到这些工作（后者仅在Ubuntu的多元宇宙）。

On Debian/Ubuntu, you need to apt-get install cloud-utils ec2-api-tools to get these working (the later is only on Ubuntu Multiverse).

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