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Create a Monitor on an Internet Service

Create a Monitor on an Internet Service

To manage high-traffic Internet services, the Enterprise Cloud can track the state of each node service in the Internet service in near real time, so that it can divert traffic from, any node service that is not responding to a node service that is responding. To do so, a monitor is bound to each Internet service. The monitor tests the Internet service by sending periodic probes to the node services in the Internet service. This is sometimes referred to as performing a health check. If the monitor receives a timely response to its probes, it marks the node service as up. If it does not receive a timely response to the configured number of probes, it marks the node service as down.

If no monitor is created, the Enterprise Cloud periodically probes with a TCP SYN message and expects a SYN-ACK response to verify that the node service remains available. In addition to this default behavior, you can create on of four types of monitors:

Monitor Probes Expects
ECV HTTP GET request HTTP response is scanned, within the first 24 KB, for a specific string (configured)
HTTP HTTP HEAD request HTTP response code (configured)
Ping ICMP echo request ICMP echo reply

To create a monitoring service on an Internet service:

  1. Select a Public IP address.
  2. Select an Internet service.
  3. Click Create Monitor.
  4. The Create Internet Service Monitor dialog appears.

  5. Select a Monitor Type.

The appearance of the dialog changes depending upon the type of monitoring selected.

ECV Monitor

An ECV monitor periodically probes each node service on the Internet service with an HTTP GET request. The response is scanned, within the first 24 KB, for a specific string to verify that the node service remains available.

  1. Type the URL to Send.
  2. Type any HTTP Headers required to successfully GET the URL.
  3. Type content expected to Receive.
  4. Select the State of the monitor.
  5. Click Advanced Options to show or hide.
  6. Type the request Interval time - the time between each probe.
  7. Type the number of Retries before considering the node service unavailable.
  8. Type the Response Timeout - the time to wait for the response to a probe.
  9. Type the Downtime - the time to wait before resuming probes after considering the node service unavailable.
  10. Click Save.

HTTP Monitor

An HTTP monitor periodically probes each node service on the Internet service with an HTTP HEAD request and expects an HTTP response to verify that the node service remains available. The Web server can be configured to send a different response to a HEAD request or none at all; a suitable response should be agreed with the web server administrator before setting up the monitor.

  1. Type the URL of the HTTP Request.
  2. Type any HTTP Headers required to successfully GET the URL.
  3. Type the expected HTTP Response Codes, a comma-delimited list.
  4. Select the State of the monitor.
  5. Click Advanced Options to show or hide.
  6. Type the request Interval time - the time between each probe.
  7. Type the number of Retries before considering the node service unavailable.
  8. Type the Response Timeout - the time to wait for the response to a probe.
  9. Type the Downtime - the time to wait before resuming probes after considering the node service unavailable.
  10. Click Save.

Ping Monitor

A ping monitor periodically probes each node service on the Internet service with an ICMP echo request and expects an ICMP echo reply in response to verify that the node service remains available.

  1. Select the State of the monitor.
  2. Type the request Interval time - the time between each probe.
  3. Type the number of Retries before considering the node service unavailable.
  4. Type the Response Timeout - the time to wait for the response to a probe.
  5. Type the Downtime - the time to wait before resuming probes after considering the node service unavailable.
  6. Click Save.

Disable Monitoring

When monitoring is disabled, the monitor periodically probes its loopback address with an ICMP echo request and expects an ICMP echo reply. While reducing traffic and logs, this monitor does not probe the node service on the Internet service and therefore does not ensure the availability of the service.

  1. Click Save.