Non-Replication Setup and Configuration Guide

Introduction

opHA-MB 5.0 introduces the concept of a Primary & multiple Poller servers and a Message Bus:

The Primary is the server that keeps the information of all the pollers and it is where we can read all the information from. The Consumer (ophad running on Primary) reads data continuously off the Message Bus and stores it in the database
The Producer (ophad running on Pollers) has a change stream setup for the collections and receives updates from the database when there are any. This change stream data is pushed onto the Message Bus.

For the terms used in this project together with their meanings, see https://docs.community.firstwave.com/wiki/spaces/opHA/pages/edit-v2/3164408853#Terminology.

1. Software Upgrade

1.1 Prerequisites

IMPORTANT: All the servers should be setup with the following

a. opHA 4 needs to be currently installed

b. Pollers and Mirrors discovered by the Main Primary

c. On the Main Primary, go to the Peers screen, and for each Peer, click on the Sync all nodes button and Pull Peer Data button to ensure latest data is on the Main Primary.

d. Server names set

e. MongoDB 6 installed

We will be using the below example host names throughout this guide.

You would replace with your own where applicable.

Main Primary: opha-primary1.opmantek.net

Poller1 Server: opha-poller1.opmantek.net

1.2 Download Software

Download the opHA 5 software onto each server.

1.3 Install Software

Run the installation commands on each server in the opHA cluster.

All the following setup commands in this setup should be run as the root user

sudo sh ./<executable>

e.g

sudo sh ./opHA-Linux-x86_64-5.0.0.run

1.4 Install Message Bus Software

The Message Bus software (NATS) has to be installed and configured.

For this scenario, we do not need a MongoDB Arbiter, so use -y to answer yes to the two questions.

cd /usr/local/omk/install
sudo sh ./install_message_bus.sh -y

2. NATS Setup

This configuration should be applied to the Main Primary server ONLY.

Edit Configuration: Update the /etc/nats-server.conf file with the following settings:
1. Change the server_name to the name of your Main Primary server.
2. Remove or comment out the cluster section, so that this remains:

server_name: "opha-primary1.opmantek.net"  #The local server  
http_port: 8222 
listen: 4222 
jetstream: enabled 
accounts { 
  $SYS { 
    users = [ 
      { user: "admin",
        pass: "password" 
      } 
    ] 
  } 
  ophad: { 
    users: [ 
        { user: "omkadmin", password: "op42opha42" } 
    ] 
    jetstream: enabled 
  } 
} 

jetstream { 
  store_dir: "/opt/nats/storage" 
  max_memory_store: 1028M 
  max_file_store: 1028M 
}

4. MongoDB Setup (Main Primary Only)

The following steps should be performed only on the Main Primary MongoDB instance.

4.1 Initialize MongoDB Replica Set

Connect to MongoDB using the mongosh command:

Run the following command

Then run the following commands, to initiate a MongoDB Replica Set for streaming database changes.

Restart mongod

3. Common Configuration for All Servers

3.1 Update `/usr/local/omk/conf/opCommon.json`

Backup Configuration: Make a backup copy of the opCommon.json file before making any changes.
Add NATS Server Configuration: Ensure the following configuration is included in opCommon.json on all servers. In the below example we have added the Main Primary FQDN and port to be utilized in the nats_server attribute, you can find this in the database section.
IMPORTANT
Delete the following line from the opCommon.json file.

5. Starting Services

5.1 Start NATS (on Main Primary Only)

Start the NATS service on the Main Primary server ONLY:

5.2 Restart mongod on Pollers and Mirrors only

After configuration changes, restart mongod on all Poller and Mirror servers ONLY:

5.3 Restart FirstWave daemons on all servers

After configuration changes have been made, you will need to restart the relevant FirstWave module daemons applicable to your server.

For example if you have NMIS9, opCharts, opEvents and opHA 5 installed you would execute as follows:

Note: after you restart the daemons, opHA MB will not be licensed on the Main Primary, so the ophad daemon will show as an Error:

Proceed to the next step.

6. Update License

Install the opHA-MB for NMIS & opCharts license on the Main Primary server only.

To obtain a license please contact FirstWave Sales.

Currently there are 2 available licenses and Message Bus will not run without a license.

opHA-MB for NMIS & opCharts (This license is required for Message Bus to run).

NMIS and opCharts data are synced from all poller/mirrors to the Main Primary using Message Bus. In replication mode, If the Main Primary were to go down the Secondary Primary will retain the NMIS and opCharts data.

opHA-MB for opEvents (This license is an add-on for opEvents).

With this add-on opEvents will use Message Bus to sync opEvents data from each poller/mirror to the Main Primary and in replication mode opEvents data is synced to the Secondary Primary. In replication mode, If the Main Primary were to go down the Secondary Primary will retain the opEvents data.

You need to enter a License Key in the Modules → opLicensing as below on the Main Primary.

7. Restart opHA service on the Main Primary

8. Start the Poller and Mirrors

Execute the following command on the poller and mirror servers.

9. Final Steps

Accept EULAs: Make sure when you login to each server to confirm that all End User License Agreements (EULAs) are accepted.

opHA-MB 5.0 Upgrade (Non-Replication)