Non-Replication Setup and Configuration Guide

Introduction

opHA 5 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 update from the database if there is any. This change stream data is pushed onto the message bus.

Here are terms used in this project together with their meanings.

Term	Meaning
Main Primary	server instance running opHA with role = 'primary_master'
Secondary Primary	server instance running opHA with role = 'master'. Also referred to as just 'primary'.
Peer	server instance running opHA with role = 'poller' or 'mirror'. It can optionally be of type 'streaming' which means that it is linked to an ophad instance.
Poller	server instance running opHA with role = 'poller'
Mirror	server instance running opHA with role = 'mirror'. It is paired with a poller and polls the same devices as that poller, however its data is not sync'd with primary unless the poller is offline.
Producer	an instance of the ophad process running in 'producer' mode (as per configuration). This will typically be running on the same server instances as the primary.
Consumer	an instance of the ophad process running in 'consumer' mode (as per configuration). This will typically be running on the same server instance as the poller (or mirror)

1. Software Installation

1.1 Download Software

Download the required software onto each server.

1.2 Install Software

IMPORTANT: All the servers should be setup with the following

a. Pollers and mirrors discovered by the Main Primary

b. Server names set

c. 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

Run the installation commands on each server as needed.

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

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:

Remove or comment out the cluster section

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 
}

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.
```
"nats_server": "opha-primary1.opmantek.net:4222"
```
IMPORTANT
Delete the following line
```
"db_mongo_cluster": [],
```

4. MongoDB Setup (Main Primary Only)

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

4.1 Initialize MongoDB

Connect to MongoDB using the mongosh command:

Run the following command

mongosh --username opUserRW --password op42flow42 admin

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

rs.initiate()

Restart mongod

systemctl restart mongod

5. Starting Services

5.1 Start NATS

Start the NATS service on the Main Primary server ONLY:

sudo systemctl start nats-server

5.2 Restart mongod on Pollers and Mirrors only

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

sudo systemctl restart mongod

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:

sudo systemctl restart nmis9d opchartsd opeventsd omkd ophad

6. Update License

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).
1. 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).
1. 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.

7. Restart opHA service on the Main Primary

sudo systemctl restart ophad

8. Start the Poller and Mirrors

Execute the following command on the poller and mirror servers.

sudo /usr/local/omk/bin/ophad cmd producer start

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 5 Installation (Non-Replication)