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