Skip to main content

Set Up LAMs for HA

To configure a new backend LAM integration for HA on LAM 1 and LAM 2:

  1. Make a copy of the corresponding LAM configuration file and rename it accordingly.

  2. Make a copy of the corresponding LAMbot LAM file and rename it accordingly.

  3. If applicable, amend the LAM configuration file to point to the LAMBot file (under the Presend section).

  4. Create the service script pointing to the configuration file.

  5. Configure the ha section of the configuration file according to the type of LAM and its corresponding HA setup.

Configure a Polling LAM for HA

To configure a polling LAM for HA, you must set the LAMs as active / passive, and therefore in the same Moogsoft Enterprise process group. If the system detects an issue with the active LAM, the passive instance will automatically take over.

Polling_LAM_HA.png

To enable automatic failover:

  1. On LAM 1 and LAM 2, edit the $MOOGSOFT_HOME/config/system.conf file and set the automatic_failover property to true:

    # Allow a passive process to automatically become active if
# no other active processes are detected in the same process group
"automatic_failover" : true,

  2. Restart the polling LAMs to finish enabling automatic failover.

Configure a Receiving LAM for HA

For a HA configuration, the receiving LAMs must always run as active / active, meaning a load balancer (of your choice) places them in different Moogsoft Enterprise process groups. Receiving LAMs run as active / active by default.

Receiving_LAM_HA.png

There are two methods you can use to implement your load balancer: chained failover or multiplexing (which sends to both active receiving LAMs.

If you choose to implement using multiplexing, ensure the following:

  • The duplicate_source parameter in the LAM config is set to true. The parameter lets Moogfarmd know to silently drop any event duplicates arriving within a configurable period.

  • The configuration files for both active Receiving LAMs, running as an HA pair, are identical, apart from their ha sections. This ensures that Moogfarmd is able to detect the event duplicates correctly.

The following example cURL command is a call from the command line to check on the status of the LAM instance:

[root@server1 moogsoft]# curl -X GET "http://server9:8888"
{"success":true,"message":"Instance is active","statusCode":0}
In this section: