Add ECS Node

This article explains the steps to add a new ECS node (ecsworker3.cdpkvm.cldr) into the existing CDP PvC ECS cluster. Please note that this activity will need to restart the entire ECS cluster including the ECS master/server node. Service disruption is expected. This is only applicable to CDP Private Cloud solution installed with ECS system.

1. In CM, navigate to Clusters > ECS > Storage UI to launch the Longhorn dashboard.

   

2. In Longhorn dashboard, take note that there is only 3 Longhorn nodes currently.

   

   Check that the ECS cluster has 3 nodes currently.

    # kubectl get nodes
    NAME                     STATUS   ROLES                       AGE     VERSION
    ecsmaster1.cdpkvm.cldr   Ready    control-plane,etcd,master   4d13h   v1.21.8+rke2r2
    ecsworker1.cdpkvm.cldr   Ready    <none>                      4d13h   v1.21.8+rke2r2
    ecsworker2.cdpkvm.cldr   Ready    <none>                      4d13h   v1.21.8+rke2r2
   

3. In CM, navigate to Clusters > ECS 1. Click 3 Hosts to view the following page. Click Add Hosts.

   

4. Select ECS 1 cluster as follows. Click Continue.

   

5. Enter the FQDN of the ECS node and click Search. Upon successful scan, the hostname alongside each host’s IP address will appear. Check the details before clicking Continue.

   

6. Click Continue.

   

7. Ensure that JDK has already been installed in the ECS host. Select Manually manage JDK and click Continue.

   

8. Enter the login credentials. Click Continue.

   

9. CM is installing the agent in the ECS node and will subsequently install the parcels.

   

10. Check the results if needed. Otherwise, click Continue.

    

11. Click Create....

    

12. Fill in the Template Name and select the role groups for this ECS worker/agent node.

    

13. Verify the details and click Continue.

    

14. Upon successful deployment, click Continue.

    

15. Click Finish.

    

16. Note that the new ECS worker/agent node has been added successfully.

    

    The ECS cluster is now updated with the new node.

    # kubectl get nodes
    NAME                     STATUS   ROLES                       AGE     VERSION
    ecsmaster1.cdpkvm.cldr   Ready    control-plane,etcd,master   4d13h   v1.21.8+rke2r2
    ecsworker1.cdpkvm.cldr   Ready    <none>                      4d13h   v1.21.8+rke2r2
    ecsworker2.cdpkvm.cldr   Ready    <none>                      4d13h   v1.21.8+rke2r2
    ecsworker3.cdpkvm.cldr   Ready    <none>                      111s    v1.21.8+rke2r2
    

17. Navigate to Clusters > ECS 1. Click the orange button to restart the ECS cluster.

    

18. Click Restart Stale Services.

    

19. Select Re-deploy client configuration and subsequently click Restart Now.

    

    This will restart the entire ECS cluster. During this process, the nodes will be reflected as NotReady.

    # kubectl get nodes
    NAME                     STATUS     ROLES                       AGE     VERSION
    ecsmaster1.cdpkvm.cldr   NotReady   control-plane,etcd,master   4d13h   v1.21.8+rke2r2
    ecsworker1.cdpkvm.cldr   NotReady   <none>                      4d13h   v1.21.8+rke2r2
    ecsworker2.cdpkvm.cldr   NotReady   <none>                      4d13h   v1.21.8+rke2r2
    ecsworker3.cdpkvm.cldr   NotReady   <none>                      11m     v1.21.8+rke2r2
    

20. Upon successful restart, click Continue.

    

21. The Longhorn dashboard now displays a total of 4 Longhorn nodes. This implies that the new ECS node has been added into the Longhorn cluster successfully.

    

    All ECS nodes should be in Ready mode.

    # kubectl get nodes
    NAME                     STATUS   ROLES                       AGE     VERSION
    ecsmaster1.cdpkvm.cldr   Ready    control-plane,etcd,master   4d14h   v1.21.8+rke2r2
    ecsworker1.cdpkvm.cldr   Ready    <none>                      4d13h   v1.21.8+rke2r2
    ecsworker2.cdpkvm.cldr   Ready    <none>                      4d13h   v1.21.8+rke2r2
    ecsworker3.cdpkvm.cldr   Ready    <none>                      14m     v1.21.8+rke2r2
    

22. The storage is now currently empty for this newly added node.

    

23. In CM, ensure that new node is in green mode with the correct roles provisioned.

    

24. Create a new environment in the CDP Data Services Management Console. After successful creation of the environment, the system might choose this new node to provision the storage. If so, the longhorn dashboard will show that some space has been provisioned in this newly added node.

    

    Verify that the system has provisioned some volumes at this new node in the /longhorndirectory which was specified during the initial ECS cluster installation.

    # tree /longhorn
    /longhorn
    `-- ecs
        `-- longhorn-storage
            |-- longhorn-disk.cfg
            `-- replicas
                |-- pvc-40338fdb-c0dd-4e0d-a634-d3e8263a46e6-bbcad0e4
                |   |-- revision.counter
                |   |-- volume-head-000.img
                |   |-- volume-head-000.img.meta
                |   `-- volume.meta
                |-- pvc-6709bacb-db5e-4129-8f9e-c645e07ad921-16dcd615
                |   |-- revision.counter
                |   |-- volume-head-000.img
                |   |-- volume-head-000.img.meta
                |   `-- volume.meta
                |-- pvc-bc1e2346-d9d8-4ff6-be00-4105a6b8f433-ae9b50e3
                |   |-- revision.counter
                |   |-- volume-head-000.img
                |   |-- volume-head-000.img.meta
                |   `-- volume.meta
                |-- pvc-cd6d226b-075a-475c-b5b3-9b79961bc338-8224c2de
                |   |-- revision.counter
                |   |-- volume-head-000.img
                |   |-- volume-head-000.img.meta
                |   `-- volume.meta
                `-- pvc-d37b564f-8d77-4cc0-b634-b85c0d1bca91-cf49bf98
                    |-- revision.counter
                    |-- volume-head-000.img
                    |-- volume-head-000.img.meta
                    `-- volume.meta
    

25. Create a new Impala database at the CDW console. The system might choose to provision the CDW pods and its persistent volume in this new node. If so, the direct attached local disk with the localpath mountpoint will be provisioned with the impala cache file as shown below. The localpath directory was configured during the initial ECS cluster installation.

    # tree /localpath/
    /localpath/
    `-- local-storage
        `-- pvc-a8c1086a-e7e3-4cf2-af02-da0a17ab146b_impala-1653548482-kwb7_scratch-cache-volume-impala-executor-000-0
            |-- impala-cache-file-b94f4c649f4d8adc:5ac6c6fd6c847ba3
            `-- impala-scratch
    
    3 directories, 1 file