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6.3.6. Removing Nodes from Districts

If many gears on a node host become idle over time, you can compact the district by decommissioning or re-purposing the node host. Use the oo-admin-ctl-district and oo-admin-move commands in combination to remove the gears from the node host, and then remove the host from its district.

Procedure 6.4. To Remove Nodes from Districts:

The following steps demonstrate an example situation where district small_district has two node hosts, node1.example.com and node2.example.com. The second node host, node2.example.com, has a high number of idle gears.
  1. Run the following commands and fix any problems that are found. This prevents future problems caused by moving a broken gear. On the broker host, run: 
    # oo-admin-chk
    Copy to Clipboard Toggle word wrap
    On the node hosts, run: 
    # oo-accept-node
    Copy to Clipboard Toggle word wrap
  2. Deactivate the node you want to remove to prevent applications from being created on or moved to the node. Existing gears continue running. On the broker host, run: 
    # oo-admin-ctl-district -c deactivate-node -n small_district -i node2.example.comoo-admin-ctl-district -c deactivate-node -n small_district -i node2.example.comoo-admin-ctl-district -c deactivate-node -n small_district -i node2.example.comoo-admin-ctl-district -c deactivate-node -n small_district -i node2.example.com
    Copy to Clipboard Toggle word wrap
  3. Move all the gears from node2.example.com to node1.example.com by repeating the following command on the broker host for each gear on node2.example.com: 
    # oo-admin-move --gear_uuid UUID -i node1.example.comoo-admin-move --gear_uuid UUID -i node1.example.comoo-admin-move --gear_uuid UUID -i node1.example.comoo-admin-move --gear_uuid UUID -i node1.example.com
    Copy to Clipboard Toggle word wrap
  4. Remove node2.example.com from the district: 
    # oo-admin-ctl-district -c remove-node -n small_district -i node2.example.comoo-admin-ctl-district -c remove-node -n small_district -i node2.example.comoo-admin-ctl-district -c remove-node -n small_district -i node2.example.comoo-admin-ctl-district -c remove-node -n small_district -i node2.example.com
    Copy to Clipboard Toggle word wrap
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