Adding a Worker Node - Azure

Overview

This procedure is for adding a worker node to an existing TOS Aurora cluster on the Azure platform. If you have not yet installed TOS Aurora on the primary data node, start with Clean Install. 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

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

  • 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.

  • 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.

    There is a step in this procedure that will cause the system to reboot, with access only from the Azure Serial Console until the machine is rebooted for the second time. Before starting, make sure you have access to the Azure Serial Console.

Procedure

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

  1. For additional help, refer to the Microsoft Azure official documentation - Create a Linux virtual machine in the Azure portal

    1. Log in to your Azure portal.

    2. Navigate to Marketplace and create a VM.

    3. Under the Basics tab, enter/select the following information:

      • Subscription - your Azure subscription name

      • Resource Group - your Azure resource group name

      • Virtual Machine Name - a name of your choice to identify the VM e.g. myVirtualMachine-0

      • Region - select from the list

      • Image - select one of the following from the list:

        • Red Hat Enterprise Linux 8.6, 8.8, 8.9, or 8.10

        • Rocky Linux 8.6, 8.8, 8.9, or 8.10

      • Size - select CPUs and memory as advised by your account team

      • Authentication type - select SSH public key

      • User name - enter azureuser

      • SSH public key source - select generate new key pair

      • Key pair name - use the default name provided

    4. Under the Disks tab, enter/select the following information

      • OS disk type - select Premium SSD
      • Encryption - default

    5. Select Create and attach a new disk.

    6. Enter the disk details:

      • Enter a Name of your choice.

      • Set Host caching to Read/write.

      • Select a storage type Take into consideration that TOS requires 7,500 IOPS and the throughput expected will average 250MB/s with bursts of up to 700MB/s.

      • Set Storage Size GiB to the disk space sizing requirement given to you by your account team.

    7. Save the disk defintions.

    8. If you want a public IP:

      • Select the Networking tab

      • Under Public IP, click Create new.

      • Enter a name.

      • Select SKU - Standard.

    9. Under the Tags tab, create two tags, replacing <your name> and <your environment name> with names of your choice:

      • owner: <your name>

      • env: <your environment name>

    10. Click Review and Create

    11. Click Create. The generate new key pair prompt appears.

    12. Generate a new key pair. Click Download private key and create resource. The private key will be downloaded to your PC as a file with suffix .pem. It will be needed to log into the VM console.

    13. Navigate to the directory on your PC that contains the .pem file just downloaded (<pem_key_name>) and change its permissions to prevent other users from running it.

      If your PC is running on a Linux-like operating system:

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

    14. You can now log in to the VM console whenever required.

      Log in to the Azure VM console where <pem_key_name> is the name of the .pem file downloaded previously from the Azure portal, <azureuser> is the name of your Azure user on the VM and <IP> is its private or public IP. The private and optional public IPs can be seen on the Networking tab.

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

    15. In the portal, select the newly created VM and then select the Networking tab.

    16. Select Add inbound port rule and create a rule with the properties below:

      • Source: Any

      • Source port ranges: *

      • Destination: Any

      • Destination port ranges: 31443, 31617, 31514, 31099, 31843, 30161, 30514, 31161 - see Ports and Services to see why

      • Protocol: Any

      • Action: Allow

      • Priority: 310

      • Name: TOS_Aurora or other name of your choice

      • Description: TOS_Aurora or other description of your choice

  2. For additional help, refer to the MicrosoftAzure official documentation - Azure Load Balancer portal settings

    1. In your Azure portal, navigate to Load Balancers.
    2. Select the load balancer created previously (when the VM for the primary data node was set up).
    3. Navigate to backend pools.
    4. Select the backend pool created previously (when the VM for the primary data node was set up).
    5. Add the new VM to the list of virtual machines in the backend pool.
    6. Save.

  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 screen and rsync:

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

    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.

    1. On the primary data node, check the TOS status.

      [<ADMIN> ~]$ tos status
      tos status

    2. In the output, check if the System Status is Ok and all the items listed under Components appear as Ok. If this is not the case, contact Tufin Support.

      3. Example output for a central cluster data node:

      [<ADMIN> ~]$ tos status         
[Mar 28 13:42:09]  INFO Checking cluster health status           
TOS Aurora
Tos Version: 24.2 (PRC1.1.0)

System Status: "Ok"
            
Cluster Status:
   Status: "Ok"
   Mode: "Multi Node"

Nodes
  Nodes:
  - ["node1"]
    Type: "Primary"
    Status: "Ok"
    Disk usage:
    - ["/opt"]
      Status: "Ok"
      Usage: 19%
  - ["node3"]
    Type: "Worker Node"
    Status: "Ok"
    Disk usage:
    - ["/opt"]
      Status: "Ok"
      Usage: 4%

registry
  Expiration ETA: 819 days
  Status: "Ok"

Infra
Databases:
- ["cassandra"]
  Status: "Ok"
- ["kafka"]
  Status: "Ok"
- ["mongodb"]
  Status: "Ok"
- ["mongodb_sc"]
  Status: "Ok"
- ["ongDb"]
  Status: "Ok"
- ["postgres"]
  Status: "Ok"
- ["postgres_sc"]
  Status: "Ok"

Application
Application Services Status OK
Running services 50/50

Remote Clusters
Number Of Remote Clusters: 2
  - ["RC"]
     Connectivity Status:: "OK:"
  - ["RC2"]
     Connectivity Status:: "OK"

  Backup Storage:
  Location: "Local
s3:http://minio.default.svc:9000/velerok8s/restic/default "
  Status: "Ok"
  Latest Backup: 2024-03-23 05:00:34 +0000 UTC

      Example output for a remote cluster data node:

      [<ADMIN> ~]$ tos status         
[Mar 28 13:42:09]  INFO Checking cluster health status           
TOS Aurora
Tos Version: 24.2 (PRC1.0.0)

System Status: "Ok"
            
Cluster Status:
   Status: "Ok"
   Mode: "Single Node"

Nodes
  Nodes:
  - ["node2"]
    Type: "Primary"
    Status: "Ok"
    Disk usage:
    - ["/opt"]
      Status: "Ok"
      Usage: 19%
  
registry
  Expiration ETA: 819 days
  Status: "Ok"

Infra
Databases:
- ["mongodb"]
  Status: "Ok"
- ["postgres"]
  Status: "Ok"

Application
Application Services Status OK
Running services 16/16

  Backup Storage:
  Location: "Local
s3:http://minio.default.svc:9000/velerok8s/restic/default "
  Status: "Ok"
  Latest Backup: 2024-03-23 05:00:34 +0000 UTC

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