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metaDir=/etc/ec2-metadata
mkdir -m 0755 -p "$metaDir"
rm -f "$metaDir/*"
get_imds_token() {
# retry-delay of 1 selected to give the system a second to get going,
# but not add a lot to the bootup time
curl \
--silent \
--show-error \
--retry 3 \
--retry-delay 1 \
--fail \
-X PUT \
--connect-timeout 1 \
-H "X-aws-ec2-metadata-token-ttl-seconds: 600" \
http://169.254.169.254/latest/api/token
}
preflight_imds_token() {
# retry-delay of 1 selected to give the system a second to get going,
# but not add a lot to the bootup time
curl \
--silent \
--show-error \
--retry 3 \
--retry-delay 1 \
--fail \
--connect-timeout 1 \
-H "X-aws-ec2-metadata-token: $IMDS_TOKEN" \
-o /dev/null \
http://169.254.169.254/1.0/meta-data/instance-id
}
try=1
while [ $try -le 3 ]; do
echo "(attempt $try/3) getting an EC2 instance metadata service v2 token..."
IMDS_TOKEN=$(get_imds_token) && break
try=$((try + 1))
sleep 1
done
if [ "x$IMDS_TOKEN" == "x" ]; then
echo "failed to fetch an IMDS2v token."
fi
try=1
while [ $try -le 10 ]; do
echo "(attempt $try/10) validating the EC2 instance metadata service v2 token..."
preflight_imds_token && break
try=$((try + 1))
sleep 1
done
echo "getting EC2 instance metadata..."
get_imds() {
# --fail to avoid populating missing files with 404 HTML response body
# || true to allow the script to continue even when encountering a 404
curl --silent --show-error --fail --header "X-aws-ec2-metadata-token: $IMDS_TOKEN" "$@" || true
}
get_imds -o "$metaDir/ami-manifest-path" http://169.254.169.254/1.0/meta-data/ami-manifest-path
(umask 077 && get_imds -o "$metaDir/user-data" http://169.254.169.254/1.0/user-data)
get_imds -o "$metaDir/hostname" http://169.254.169.254/1.0/meta-data/hostname
get_imds -o "$metaDir/public-keys-0-openssh-key" http://169.254.169.254/1.0/meta-data/public-keys/0/openssh-key
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