Service-watchdog

service-watchdog.sh

#!/bin/bash
# First arg should be the systemd service to watch
# Requires cloud-utils apt package and pip awscli
# Requires IAM access to IAM action autoscaling:SetInstanceHealth

EC2_INSTANCE_ID=$(ec2metadata --instance-id)  
PROCESS_CHECK=$1  
REGION=$2

while :  
do  
 if systemctl --no-pager status "$PROCESS_CHECK" | grep -q "active (running)"
   then
     aws autoscaling set-instance-health --instance-id "$EC2_INSTANCE_ID" --health-status Healthy --region ${REGION}
 else
     echo "unhealthy, alerting autoscaling group"
     aws autoscaling set-instance-health --instance-id "$EC2_INSTANCE_ID" --health-status Unhealthy --region ${REGION}
 fi
sleep 10  
done