Sync a ec2 instance inside a specific load balancer.

AWS_EC2_WWW_SYNC.sh

#!/bin/sh

# SCRIPT REQUIRE NGINX PERMISSIONS ON SYNC_PATH AND SSH ACCESS TO MACHINES.

ELB_NAME=MY_ELB_NAME
LIST_FILE=/tmp/instance_list_$(date +%Y%m%d%H%M%S).txt
LOG_FILE=/tmp/instance_sync_$(date +%Y%m%d%H%M%S).log
SYNC_PATH=/var/www
SEND_ALERT="aws sns publish --topic-arn MY_SNS_TOPIC --message"

ACCESS_KEY=MY-KEY
SECRET_KEY=MY-SECRET
REGION=THE-REGION

# Busca ip publico atual
myip4=$(curl -s http://169.254.169.254/latest/meta-data/local-ipv4|head -1)

SYNC_OK=0

# Busca lista de instancias do load balancer
aws elb describe-instance-health --load-balancer-name ${ELB_NAME} | jq ".InstanceStates[] | select(.State == \"InService\").InstanceId" | sed -e 's/"//g' > $LIST_FILE

# Para cada instancia
for instance_id in $(cat $LIST_FILE)
do

        echo "Tentativa de sync com a instancia $instance_id" > $LOG_FILE

        # Pega o host
        host=$(ec2-describe-instances --aws-access-key=${ACCESS_KEY} --aws-secret-key=${SECRET_KEY} --region=${REGION} -F instance-id=${instance_id} | fgrep INSTANCE | awk {'print $14'} | grep -oE "\b([0-9]{1,3}\.){3}[0-9]{1,3}\b")

        # Se não for a mesma maquina
        if [ ! -z "$host" ] && [ "$myip4" != "$host" ]
        then

                echo "Copiando da instancia $instance_id $host" > $LOG_FILE
                
                mv -rf SYNC_PATH SYNC_PATH_old
                rsync -4phrztgoDvlXe 'ssh -l nginx -o "StrictHostKeyChecking false"' --exclude ".svn/" --exclude ".git/" --exclude-from=/home/scripts/sync_exclude_files_init $host:SYNC_PATH SYNC_PATH
                SYNC_OK=1
        else

                echo "Falha ao tentar sync com a instancia $instance_id" > $LOG_FILE

        fi
done

if [ "$SYNC_OK" -eq 0 ]
then
        $SEND_ALERT "Falha para efetuar o sync da instância de host $myip4" > $LOG_FILE
fi