148 lines
4.7 KiB
Bash
148 lines
4.7 KiB
Bash
#!/bin/sh
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function log { logger -t "user-data.${_FUNC}" -- $@; }
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function die { log "$@"; exit_trap 1 1 / "$@"; }
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# msg used for sns event, last one wins
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function msg { MSG="$@"; log "$@"; }
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# Generic retry command wrapper, incl. timeout of 30s
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# $1 = number of tries; 0 = forever
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# $2 = number of seconds to sleep between tries
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# $@ actual command
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retry() {
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local tries=$1
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local waitfor=$2
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shift 2
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while true; do
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# Only use timeout of $1 is an executable, call directly if function
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type -tf $1 >/dev/null && { timeout --preserve-status 30 $@ && return; } || { $@ && return; }
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((tries=tries-1))
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[ $tries -eq 0 ] && return 1
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sleep $waitfor
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done
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}
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function add_swap() {
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[ -f /.swapfile ] || { dd if=/dev/zero of=/.swapfile bs=1M count=$1 && chmod 600 /.swapfile && mkswap /.swapfile && swapon /.swapfile; }
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grep -q "/.swapfile" /etc/fstab || echo "/.swapfile none swap sw 0 0" >> /etc/fstab
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sysctl -w vm.swappiness=10
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}
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# Get SSM secure string base64 decoded
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# $0 SSM_PATH, value to stdout
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function get_secret() {
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aws ssm get-parameter --name ${1,,} --with-decryption --query 'Parameter.Value' | base64 -d
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}
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# Store values as base64 on SSM
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# $0 SSM_PATH VALUE
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function put_secret() {
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aws ssm put-parameter --name ${1,,} --type SecureString --value "$(echo "$2" | base64 -w0)" --overwrite
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}
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# Gets existing passphrase or creates new passphrase and stores it
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function init_passphrase() {
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local _URL=$1
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local _PPFILE=$2
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# If secret already exists noop
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[ -f $_PPFILE ] && return 0
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get_secret $_URL > $_PPFILE && chmod 600 $_PPFILE || \
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{ xxd -l16 -p /dev/random > $_PPFILE; chmod 600 $_PPFILE; put_secret $_URL "$(cat $_PPFILE)"; }
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}
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function asg_heartbeat {
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[ -n "$LAUNCH_HOOK" ] && aws autoscaling record-lifecycle-action-heartbeat --instance-id $INSTANCE_ID --lifecycle-hook-name $LAUNCH_HOOK --auto-scaling-group-name $AWS_AUTOSCALING_GROUPNAME || true
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}
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function setup_sns_alarms() {
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# store SNS message json template
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cat <<EOF > /etc/cloudbender/sns_alarm.json
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{
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"Source": "CloudBender",
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"AWSAccountId": "$AWS_ACCOUNT_ID",
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"Region": "$REGION",
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"Artifact": "$ARTIFACT",
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"Asg": "$AWS_AUTOSCALING_GROUPNAME",
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"Instance": "$INSTANCE_ID",
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"ip": "$IP_ADDRESS"
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}
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EOF
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mkdir -p /var/lib/cloudbender
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cat <<EOF > /var/lib/cloudbender/sns_alarm.sh
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#!/bin/bash
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SUBJECT=\$1
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MSG=\$2
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LEVEL=\${3:-Info}
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ATTACHMENT=\${4:-""}
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EMOJI=\${5:-""}
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jq -M --arg subject "\$SUBJECT" --arg level "\$LEVEL" --arg msg "\$MSG" --arg attachment "\$ATTACHMENT" --arg emoji "\$EMOJI" --arg hostname "\$HOSTNAME" '.Subject = \$subject | .Level = \$level | .Message = \$msg | .Attachment = \$attachment | .Emoji = \$emoji | .Hostname = \$hostname' < /etc/cloudbender/sns_alarm.json | sed -e 's/\\\\\\\\/\\\\/g' > /tmp/sns.json
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aws sns publish --region ${REGION} --target-arn $ALARMSNSARN --message file:///tmp/sns.json
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EOF
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chmod +x /var/lib/cloudbender/sns_alarm.sh
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}
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function exit_trap {
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set +e
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trap - ERR EXIT
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local ERR_CODE=$1
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local ERR_LINE="$2"
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local ERR_FUNC="$3"
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local ERR_CMD="$4"
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if [ $ERR_CODE -ne 0 ]; then
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CFN_STATUS="FAILURE"
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RESULT="ABANDON"
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else
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CFN_STATUS="SUCCESS"
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RESULT="CONTINUE"
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fi
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# Add SNS events on demand
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if [ "x${ALARMSNSARN}" != 'x' ]; then
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if [ $ERR_CODE -ne 0 ]; then
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LEVEL="Error"
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SUBJECT="Error during cloud-init."
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if [ $ERR_LINE -ne 1 ]; then
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MSG="$ERR_CMD failed in $ERR_FUNC at $ERR_LINE. Return: $ERR_CODE"
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ATTACHMENT="$(pr -tn $0 | tail -n+$((ERR_LINE - 3)) | head -n7)"
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else
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MSG="$ERR_CMD"
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fi
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if [ -n "$DEBUG" ]; then
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SUBJECT="$SUBJECT Instance kept running for debug."
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else
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SUBJECT="$SUBJECT Instance terminated by ASG lifecycle hook."
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fi
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else
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LEVEL="Info"
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SUBJECT="ZDT Alpine Instance launched."
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fi
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if [ -z "${DISABLECLOUDBENDERSNSSCALINGEVENTS}" ] || [ "$LEVEL" != "Info" ]; then
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/var/lib/cloudbender/sns_alarm.sh "$SUBJECT" "$MSG" "$LEVEL" "$ATTACHMENT"
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fi
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# Disable scaling events during shutdown
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[ -n "${DISABLECLOUDBENDERSNSSCALINGEVENTS}" ] && echo "DISABLE_SCALING_EVENTS=1" >> /etc/cloudbender/rc.conf
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fi
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[ -n "$LAUNCH_HOOK" ] && aws autoscaling complete-lifecycle-action --lifecycle-action-result $RESULT --instance-id $INSTANCE_ID --lifecycle-hook-name $LAUNCH_HOOK --auto-scaling-group-name ${AWS_AUTOSCALING_GROUPNAME} || true
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if [ -n "${AWS_CLOUDFORMATION_LOGICAL_ID}" ]; then
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aws cloudformation signal-resource --stack-name ${AWS_CLOUDFORMATION_STACK_NAME} --logical-resource-id ${AWS_CLOUDFORMATION_LOGICAL_ID} --unique-id ${INSTANCE_ID} --status ${CFN_STATUS}
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fi
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# timestamp being done
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end_uptime=$(awk '{print $1}' < /proc/uptime)
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log "Exiting user-data. Duration: $(echo "$end_uptime-$start_uptime" | bc) seconds"
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exit 0
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}
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