checkin.service

# /etc/systemd/system/checkin.service
[Unit]
Description=Azure Check-In

[Service]
ExecStart=/bin/bash /var/checkin.sh

[Install]
WantedBy=multi-user.target

checkin.sh

WIRESERVER="168.63.129.16"

r=$(curl -X GET -H 'x-ms-version: 2012-11-30' "http://$WIRESERVER/machine?comp=goalstate")
container_id=$(echo "$r" | grep "<ContainerId>" | sed "s,[[:space:]]\|</*ContainerId>,,g")
instance_id=$(echo "$r" | grep "<InstanceId>" | sed "s,[[:space:]]\|</*InstanceId>,,g")

HEALTH=$(cat << EOF
<?xml version="1.0" encoding="utf-8"?>
<Health xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <GoalStateIncarnation>1</GoalStateIncarnation>
  <Container>
    <ContainerId>$container_id</ContainerId>
    <RoleInstanceList>
      <Role>
        <InstanceId>$instance_id</InstanceId>
        <Health>
          <State>Ready</State>
        </Health>
      </Role>
    </RoleInstanceList>
  </Container>
</Health>
EOF
)

curl -X POST -H 'x-ms-version: 2012-11-30' -H "x-ms-agent-name: WALinuxAgent" -H "Content-Type: text/xml;charset=utf-8" -d "$HEALTH" http://$WIRESERVER/machine?comp=health