High Availability

UFM HA supports High-Availability on the host level for UFM Enterprise appliances. The solution is based on a pacemaker to monitor services, and on DRBD to sync file-system states.

UFM HA should be configured on two appliances, master and standby via the configure_ha_nodes.sh tool. For detailed information on configuring UFM HA from the master (AKA main) appliance, refer to Installing UFM Server Software for High Availability. Since the UFM HA package and related components (i.e. pacemaker and DRBD) are already deployed, follow instructions from step 6 (Configure HA from the main server) and onward.

• To manage the HA cluster, use the ufm_ha_cluster tool.
  ufm_ha_cluster Usage

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  # ufm_ha_cluster --help
  ===================================================================
   UFM-HA version: 5.1.0-8
  -------------------------------------------------------------------
   Usage: ufm_ha_cluster [-h|--help] <command> [<options>]
   
  This script manages UFM HA cluster.
          

  Options:

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  OPTIONS:
     -h|--help                        Show this message
   
  COMMANDS:
      version           HA cluster version
      config            Configure HA cluster
      cleanup           Remove HA configurations
      status            Check HA cluster status
      failover          Master node failover
      takeover          Standby node takeover
      start             Start HA services
      stop              Stop HA services
      detach            etach the standby from cluster
      attach            Attach a new standby to cluster
      enable-maintain   Enable maintenance to cluster
      disable-maintain  Disable maintenance to cluster
      reset             Reset DRBD connectivity from split-brain
          

• For further information on each command, run:

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  ufm_ha_cluster <command> --help
          

• To check UFM HA cluster status, run:

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  ufm_ha_cluster status
          

• To start the UFM HA cluster, run:

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  ufm_ha_cluster start
          

• To stop the UFM HA cluster, run:

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  ufm_ha_cluster stop
          

• Execute the failover command on the master appliance to become the standby appliance. Run:

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  ufm_ha_cluster failover
          

• Execute the takeover command on the standby machine to become the master appliance. Run:

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  ufm_ha_cluster takeover