Created
August 4, 2015 19:38
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Extract VPC DNS IP from AWS instance metadata
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| #!/bin/bash | |
| MAC="$(curl -s http://169.254.169.254/latest/meta-data/network/interfaces/macs/)" | |
| VPCCIDR="$(curl -s http://169.254.169.254/latest/meta-data/network/interfaces/macs/"$MAC"/vpc-ipv4-cidr-block)" | |
| VPCNET="${VPCCIDR%%/*}" | |
| VPCBASE="$(echo "$VPCNET" | cut -d"." -f1-3)" | |
| VPCDNS="$VPCBASE"'.2' | |
| echo "$VPCDNS" |
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Just to say, the
/etc/resolv.conftrick doesn't work on systems with systemd-resolver (eg. Ubuntu 18), or on systems such as a Mac (Mojave or later).On Ubuntu, you may be able to do something like:
systemd-resolve --status | awk '/DNS Servers:/ { print $3 }'I haven't tried, but on other systems,
resolvectl statusmay also give similar information that you may be able to use.