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AWS EC2のNameタグをインスタンスのホスト名として設定する方法

Last updated at Posted at 2018-09-19

前提条件

  • curlとawscliが当該インスタンスにインストールされていること
  • 当該インスタンスにec2 describe-instances可能なIAMロールが設定されていること
#!/bin/sh
TMPDIR=/tmp

# 自分自身(インスタンス)のIDを取得する
curl 'http://169.254.169.254/latest/meta-data/instance-id' > ${TMPDIR}/instance-id.txt

# 自分自身(インスタンス)のホスト名を取得する
aws ec2 describe-instances \
--query 'Reservations[].Instances[].{Name:Tags[?Key==`Name`].Value}' \
--filter "Name=instance-id,Values=`cat ${TMPDIR}/instance-id.txt`" \
| jq -r .[0].Name[0] > ${TMPDIR}/hostname.txt

# ホスト名をセットする
hostname `cat ${TMPDIR}/hostname.txt`
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