Monitoring | Farmguardians

Farmguardian

The Farmguardian section lists all the health checks available in the load balancer. It also includes a brief description of each check and the farms where they are applied.

Farmguardian is used for advanced monitoring of the backends. When Farmguardian detects a problem, it automatically disconnects from the real server and marks its IP address as blacklisted.

Health checks can be either pre-configured or custom. The two types of checks can be identified by the action column. Each check with a grayed-out configuration setting is pre-configured, and those that are editable after clicking the pencil icon are custom.

The image below shows a list of Farmguardian rules:
oracle_jd_edwards_load_balancing_farm

Actions: To manage Farmguardian checks, you can use the following actions from the Action menu:

  • Create Farmguardian: Opens the farmguardian form where you can fill in the necessary information to create a new check.
  • Delete: Removes the selected farmguardian check.

The Farmguardian table contains the following information:

Name: A descriptive name of the Farmguardian check.
Description: A description of the Farmguardian check.
Command: The command and parameters to be executed on every interval against each backend of the farm.
Farms: The farms and services that use the Farmguardian check.
Actions: The following actions can be used to manage the Farmguardian check:

  • Edit: Opens the configuration screen for the Farmguardian check. This action is only available for custom farmguardian checks.
  • Delete: Deletes the selected Farmguardian check. If the check is assigned to any service, a notification will ask you if you want to force the deletion. This action is only available for custom farmguardian checks.

Preconfigured Health-Checks

These are the built-in health checks for your farms.

Pre-configured health check Description
check_redis Checks if a Redis server is running in master role. If it is not, the backend is marked as down.
check_tcp Sends a TCP connection to the backend and checks if it is successful.
check_udp Sends a UDP connection to the backend and checks if the port is open.
check_http Sends an HTTP request to the backend and expects a 200 OK response within 5 seconds.
check_https Sends an HTTPS request to the backend and expects a 200 OK response within 5 seconds.
check_smtp Sends an SMTP connection to the backend and expects an SMTP OK response within 5 seconds.
check_http_response_string Sends an HTTP request to the backend and expects a 200 OK response and a given string in the HTML within 5 seconds. The string can be changed to any value that you want to find in the response.
check_https_response_string Sends an HTTPS request to the backend and expects a 200 OK response and a given string in the HTML within 5 seconds. The string can be changed to any value that you want to find in the response.
check_pop Sends a POP connection to the backend and expects a POP OK response within 5 seconds.
check_ldap Sends an LDAP query to the backend and expects an LDAP bind within 5 seconds. The base search, user to bind, and user password can be changed.
check_ldaps Sends an LDAPS query to the backend and expects an LDAP bind within 5 seconds. The base search, user to bind, and user password can be changed.
check_imap Sends an IMAP connection to the backend and expects an IMAP OK response within 5 seconds.
check_top Sends a TCP connection to the backend.
check_sip Tests a SIP server/device for availability and response time.
check_ping Sends 2 ICMP packets and checks if they both reach the host.
check_common Checks the folder /usr/lib/nagios/plugins, which includes more checks. More information about each health check can be obtained by running the check with the –help option.

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