Adding a Worker Node - AWS

Overview

This procedure is for adding a worker node to an existing TOS Aurora cluster on the AWS platform. If you have not yet installed TOS Aurora on the primary data nodes, start with Clean Install of TOS Aurora on AWS. For all other installation paths such as upgrade or other platforms, see the menu for the appropriate procedure.

You do not need to install TOS on the worker nodes.

Prerequisites

  • You cannot use IP Tables. All IP tables rules will be flushed when adding the node.

  • Your primary data node must also be deployed on AWS.

  • You must know the resources you will need - CPU cores, RAM, disk space and the load-model parameter, provided by your account team based on the procedure Calculate resources - clean install.

  • You will need to allow access to required Ports and Services.
  • If you intend to use syslog, allocate a syslog VIP on the same subnet as your primary VIP.
  • The node's network IP must be on the same subnet as the cluster primary VIP.

  • Give the node a unique hostname in the cluster - use the command below, replacing <mynode> with your preferred name:

  • [<ADMIN> ~]$ sudo hostnamectl set-hostname <mynode>
    sudo hostnamectl set-hostname <mynode>
  • You will need to configure three partitions: /opt, /tmp and /var. The /opt partition will contain your data, which will increase over time. Most of your available disk space should be allocated to this partition and the minimum is determined by the load model parameter (small, medium, large) provided by your account team. Minimum sizes for all partitions:

    Minimum Partition Sizes

    /opt/

    (Small)*

    /opt/

    (Medium)*

    /opt/

    (Large)*

    /tmp/

     

    /var/

     

    Central cluster / remote cluster primary data node / HA data nodes 80 GB 170 GB 370 GB 25 GB 200GB
    Worker node (central and remote clusters) 70 GB 70 GB 70 GB 25 GB 60 GB

    *Small, medium and large refer to the load model parameter provided by your account team.

    We recommend allocating /opt partition all remaining disk space after you have partitioned the other directories.

Procedure

Before you proceed, read and understand Prerequisites - this may prevent unexpected failures.

After the node is added, we recommend stopping tos and then starting it to enhance the node's performance. This will require downtime.