68 lines
1.9 KiB
Bash
68 lines
1.9 KiB
Bash
|
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() {
|
||
|
|
# Intentionally no --fail here, so that we proceed even if e.g. a
|
||
|
|
# 404 was returned (but we still fail if we can't reach the IMDS
|
||
|
|
# server).
|
||
|
|
curl --silent --show-error --header "X-aws-ec2-metadata-token: $IMDS_TOKEN" "$@"
|
||
|
|
}
|
||
|
|
|
||
|
|
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
|