oms_host_down

Impact on the system

When an OceanBase Migration Service (OMS) host is down, it becomes unavailable.

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

• If HA 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 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 in 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 an HA environment with multiple hosts, enable the enableHost configuration item and perform migration.

  Notice

  You can migrate only JDBCWriter and Connector but not full data.

  To enable the enableHost configuration item, perform the following steps:

  1. Log in to the OMS console.

  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 next to Value of the parameter name.

  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 engineers of OMS.