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.

  1. For additional help, refer to the official AWS documentation - Create your EC2 resources and launch your EC2 instance.

    1. In your AWS console, navigate to EC2 > Instances > Launch Instances.

    2. In the Name and tags pane, enter the name of the instance.

    3. In the Application and OS Images pane, choose an Amazon Machine image (AMI) from the AWS Marketplace. The AMI needs to be for:

      • Red Hat Enterprise Linux 8.6, 8.8, or 8.9

      • Rocky Linux 8.6, 8.8, or 8.9

      If you select Red Hat, it must be 'Red Hat Enterprise Linux Server Standard'. Other Linux distributions and versions are not supported.

    4. In the Instance type pane, select an instance type that meets your CPU and RAM resource requirements (see Prerequisites section).

    5. In the Key pair (login) pane, select or create a key pair to securely connect to your instance.

    6. In the Network Settings pane, click Edit, and enter/select the following details:

      • Network: The VPC you are using with this instance

      • Subnet: The subnet you are using with this instance

      • Auto-assign public IP: Select Disable.

      • Firewall (security groups): Create a new security group, or select an existing security group that you want to use to control the traffic to your instance.

    7. In the Configure Storage pane:

      1. Click Add new volume.

      2. For each volume, enter/select the following:

        • 300

        • General purpose SSD (gp3)

      3. Click the Advanced link, and set the IOPS, Throughput, and Encryption for each volume. Take into consideration that TOS requires 7,500 IOPS and the throughput expected will average 250MB/s with bursts of up to 700MB/s.

        The encryption should match your company's security policy.

    8. Click Launch Instance.

    9. (Optional) We recommend changing the permissions of the .pem file downloaded to your PC to prevent unauthorized users from running it. If your PC is running on a Linux-like operating system, run the command:

      [<ADMIN> ~]# chmod 400 <pem_key_name>
      chmod 400 <pem_key_name>

    10. When required, log in to the instance as follows:

      [<ADMIN> ~]# ssh -i <pem_key_name> <awsuser>@<IP>
      ssh -i <pem_key_name> <awsuser>@<IP>

      where

      • <pem_key_name> is the name of the .pem file downloaded previously from the AWS console

      • <awsuser> is the name of your AWS user

      • <IP> is its private or public IP

    1. In your AWS console, navigate to EC2 > Target Groups. All targets groups are listed.

    2. For each of the target groups created previously for the primary data node:

      1. Select the target group.

      2. Select tab Targets.

      3. Select Register targets.

      4. Enter/select details:

        • Network: The VPC allocated to TOS Aurora

        • IPv4 address: The IP address of the new instance

        • Ports: The corresponding source port for the defined target port - same as in the target added previously for the primary data node e.g. 31099

      5. Click Include as pending below.

      6. Click Register pending targets.

  3. If not done already, set up partitions according to the Prerequisites.

    1. If you are not currently logged in as user root, do so now.

      [<ADMIN> ~]$ su -
      su -

    2. If you want to change the host name or IP of the machine, do so now. Once TOS Aurora has been installed, changing the host name or IP address will require reinstalling - see Changing IP Address/Host Names. To change the host name, use the command below, replacing <mynode> with your preferred name.

      [<ADMIN> ~]# hostnamectl set-hostname <mynode>
      hostnamectl set-hostname <mynode>

    3. Modify the environment path to run TOS CLI commands without specifying the full path (/usr/local/bin/tos). 

      [<ADMIN> ~]# echo 'export PATH="${PATH}:/usr/local/bin"' | sudo tee -a /root/.bashrc > /dev/null
      echo 'export PATH="${PATH}:/usr/local/bin"' | sudo tee -a /root/.bashrc > /dev/null

    4. Synchronize your machine time with a trusted NTP server. Follow the steps in Configuring NTP Using Chrony.

    5. Configure the server timezone.

      [<ADMIN> ~]# timedatectl set-timezone <timezone>
      timedatectl set-timezone <timezone>

      where <timezone> is in the format Area/Location. Examples: America/Jamaica, Hongkong, GMT, Europe/Prague. List the time-zone formats that can be used in the command.

      [<ADMIN> ~]# timedatectl list-timezones
      timedatectl list-timezones

    6. Upgrade the kernel:

      [<ADMIN> ~]# dnf upgrade
      dnf upgrade

    7. Disable SELinux:

      • If file /etc/selinux/config exists, edit and change the value of SELINUX to disabled:

        SELINUX=disabled
      • If the file doesn't exist or SELINUX is already set to disabled, do nothing.
    8. Reboot the machine and log in.
    9. Install Wireguard. This is needed to encrypt communication between nodes (machines) within the cluster. See Install Wireguard and follow the steps for your Linux distribution.
    10. Reboot the machine and log in.

    11. Install tmux and rsync:

      [<ADMIN> ~]# dnf install -y rsync tmux
      dnf install -y rsync tmux

    12. Disable the firewall:

      [<ADMIN> ~]# systemctl stop firewalld
      systemctl stop firewalld
      [<ADMIN> ~]# systemctl disable firewalld
      systemctl disable firewalld

    13. Create the TOS Aurora load module configuration file /etc/modules-load.d/tufin.conf. Example using vi:

      [<ADMIN> ~]# vi /etc/modules-load.d/tufin.conf
      vi /etc/modules-load.d/tufin.conf

    14. Specify the modules to be loaded by adding the following lines to the configuration file created in the previous step. The modules will then be loaded automatically on boot.

      br_netfilter
      wireguard
      overlay
      ebtables
      ebtable_filter
      br_netfilter wireguard overlay ebtables ebtable_filter

    15. Load the above modules now:

      [<ADMIN> ~]# cat /etc/modules-load.d/tufin.conf |xargs modprobe -a 
      cat /etc/modules-load.d/tufin.conf |xargs modprobe -a

      Look carefully at the output to confirm all modules loaded correctly; an error message will be issued for any modules that failed to load.

    16. Check that Wireguard has loaded correctly. 

      [<ADMIN> ~]# lsmod |grep wireguard
      lsmod |grep wireguard

      The output will appear something like this:

      wireguard              201106  0
ip6_udp_tunnel         12755  1 wireguard
udp_tunnel             14423  1 wireguard

      If Wireguard is not listed in the output, contact support.

    17. Create the TOS Aurora kernel configuration file /etc/sysctl.d/tufin.conf. Example using vi:

      [<ADMIN> ~]# vi /etc/sysctl.d/tufin.conf
      vi /etc/sysctl.d/tufin.conf

    18. Specify the kernel settings to be made by adding the following lines to the configuration file created in the previous step. The settings will then be applied on boot. 

      net.bridge.bridge-nf-call-iptables = 1
      fs.inotify.max_user_watches = 1048576
      fs.inotify.max_user_instances = 10000
      net.ipv4.ip_forward = 1
      net.bridge.bridge-nf-call-iptables = 1 fs.inotify.max_user_watches = 1048576 fs.inotify.max_user_instances = 10000 net.ipv4.ip_forward = 1

    19. Apply the above kernel settings now:

      [<ADMIN> ~]# sysctl --system
      sysctl --system
    For maximum security, we recommend only installing official security updates and security patches for your Linux distribution, as well as the RPMs specifically mentioned in this section.

    1. Log in to the primary data node.

    2. On the primary data node:

      [<ADMIN> ~]$ sudo tos cluster node add --role=worker
      sudo tos cluster node add --role=worker

      On completion, a new command string is displayed, which you will need to run on the new node within 30 minutes. If the allocated time expires, you will need to repeat the current step.

    3. Copy the command string to the clipboard.

    4. Log in to the new node.

    5. On the new node, paste the command string copied previously and run it. If the allocated time has expired, you will need to start from the beginning.
    6. Verify that the node was added by running sudo tos cluster node list on the primary data node.

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