oms_host_down

Impact on the system

When a host of OceanBase Migration Service (OMS) Community Edition is down, it becomes unavailable.

• If high availability is not enabled, related tasks of the host fail.

• If high availability is enabled:

  • When another host is available, related tasks of the host are migrated to the available host. In addition, a migration alert is triggered to prompt you to check the migration result.

  • When no other host is available, OMS Community Edition fails.

Possible causes

• The host or Docker container is down for unknown reasons.

• The oms_drc_supervisor application is interrupted. You can run supervisorctl to check whether the application is interrupted.

• The network is disconnected.

Solution

• If the oms_drc_supervisor application is interrupted, log on to the host and run supervisorctl restart oms_drc_supervisor to restart the application. If the application still fails, go to the /home/admin/logs/supervisor directory to view the error logs.

• In a high-availability environment with multiple hosts, enable the enableHost parameter and perform migration.

  Notice:

  You can migrate only JDBCWriters and connectors but not full data.

  To enable the enableHost parameter, perform the following steps:

  1. Log on to the console of OceanBase Migration Service (OMS) Community Edition.

  2. In the left-side navigation pane, choose System Management > System Parameters.

  3. On the System Parameters page, find ha.config.

  4. Click the edit icon in the Value column of the parameter.

  5. In the Modify Value dialog box, change the value of enableHost to true.

  6. Click OK.

• If this alert is triggered by network disconnection or other causes, contact Technical Support of OMS Community Edition.