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#!/bin/bash | |
MAC_ADDRESS=`curl http://169.254.169.254/latest/meta-data/network/interfaces/macs/` | |
VPC_ID=`curl http://169.254.169.254/latest/meta-data/network/interfaces/macs/${MAC_ADDRESS:-1}/vpc-id` | |
INSTANCE_ID=`curl http://169.254.169.254/latest/meta-data/instance-id` | |
REGION=`curl http://169.254.169.254/latest/dynamic/instance-identity/document|grep region|awk -F\" '{print $4}'` | |
TAG_KEY="Reach" | |
TAG_VALUE="private" | |
ROUTE_TABLES=`aws ec2 describe-route-tables --filters "Name=tag:$TAG_KEY,Values=$TAG_VALUE" --region $REGION --output text | grep ROUTETABLES | grep $VPC_ID | awk '{print $3}'` | |
for ROUTE_TABLE in $ROUTE_TABLES | |
do | |
TARGET=`aws ec2 describe-route-tables --filters "Name=route-table-id,Values=$ROUTE_TABLE" --region $REGION --output text | grep "0.0.0.0/0" | awk '{print $3}'` | |
echo "Checking $ROUTE_TABLE" | |
if [ "$TARGET" = "" ]; then | |
echo "No default route is detected. Creating default route for $ROUTE_TABLE" | |
aws ec2 create-route --route-table-id $ROUTE_TABLE --destination-cidr-block 0.0.0.0/0 --instance-id $INSTANCE_ID --region $REGION | |
elif [ "$TARGET" != "$INSTANCE_ID" ]; then | |
echo "Default route is set to $TARGET. Replacing default route to $INSTANCE_ID" | |
aws ec2 replace-route --route-table-id $ROUTE_TABLE --destination-cidr-block 0.0.0.0/0 --instance-id $INSTANCE_ID --region $REGION | |
else | |
echo "No change is required" | |
fi | |
done | |
aws ec2 modify-instance-attribute --instance-id $INSTANCE_ID --no-source-dest-check --region $REGION |
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