ec2-configure-service-discovery-registration.sh

#! /bin/bash

EC2_METADATA=http://169.254.169.254/latest
REGION=$(curl -s $EC2_METADATA/dynamic/instance-identity/document | jq -r '.region')
INSTANCE_ID=$(curl -s $EC2_METADATA/meta-data/instance-id);
INSTANCE_IP=$(curl -s $EC2_METADATA/latest/meta-data/local-ipv4);

cat > /etc/init.d/cloudmap-register <<-EOF
#! /bin/bash -ex
aws servicediscovery register-instance \
  --region $REGION \
  --service-id {{serviceId}} \
  --instance-id $INSTANCE_ID \
  --attributes AWS_INSTANCE_IPV4=$INSTANCE_IP,AWS_INSTANCE_PORT={{instancePort}}
exit 0
EOF
chmod a+x /etc/init.d/cloudmap-register

cat > /etc/init.d/cloudmap-deregister <<-EOF
#! /bin/bash -ex
aws servicediscovery deregister-instance \
  --region $REGION \
  --service-id {{serviceid}} \
  --instance-id $INSTANCE_ID
exit 0
EOF
chmod a+x /etc/init.d/cloudmap-deregister

cat > /usr/lib/systemd/system/cloudmap.service <<-EOF
[Unit]
Description=Run CloudMap service
Requires=network-online.target network.target
DefaultDependencies=no
Before=shutdown.target reboot.target halt.target

[Service]
Type=oneshot
KillMode=none
RemainAfterExit=yes
ExecStart=/etc/init.d/cloudmap-register
ExecStop=/etc/init.d/cloudmap-deregister

[Install]
WantedBy=multi-user.target
EOF

systemctl enable cloudmap.service
systemctl start  cloudmap.service