Non-Replication Setup and Configuration Guide

opHA 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 recieves 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. Mongo 6 installed

In this setup guide we are using example server/host names so you will have to use the names that you have set for your own configuration.

Main-Primary Server : opha-dev1.opmantek.net

Poller1 Server opha-dev2.opmantek.net

Mirror1 Server opha-dev3.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

sh ./<executable>

e.g

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-dev1.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 
} 
#cluster { 
#  name: "C1" 
#  host: "opha-dev1.opmantek.net"  #The current host 
#  # the current server 
#  listen: "0.0.0.0:6222" 
#  routes: [ 
#    # secondary primary
#    "nats://opha-dev6.opmantek.net:6222" 
#    # server with the arbiter 
#    "nats://opha-dev2.opmantek.net:6222" 
#    # other servers 
#  ] 
#}

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 in the nats_server string int the “database“ json object
```
"nats_server": "opha-dev1.opmantek.net:4222"
```
IMPORTANT
Delete the following line
```
"db_mongo_cluster": [],
```

5. MongoDB Setup (Main-Primary Only)

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

5.1 Initialize MongoDB Replica Set

Connect to MongoDB using the mongosh command and configure the replica set:

Run the following command

mongosh --username opUserRW --password op42flow42 admin

Run the following command

rs.initiate()

Restart mongod

systemctl restart mongod

6. Starting Services

6.1 Start NATS

Start the NATS service on the Main-Primary server ONLY:

systemctl start nats-server

6.2 Restart mongod on Pollers and Mirrors only

After configuration changes, restart mongod on all Mirrors and Pollers servers ONLY :

systemctl restart mongod

6.3 Restart services on all servers

After configuration changes, restart the services on all the servers :

systemctl restart nmis9d opchartsd opeventsd omkd ophad

4.2 Update License

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

opHA-MB for NMIS & opCharts (This license is required for messagebus to run)
opHA-MB for opEvents (This license is an add-on for opEvents)

6.3 Restart ophad on the main-primary

systemctl restart ophad

6.4 Start the Poller and Mirrors

Execute the following command on the poller and mirror servers.

cd /usr/local/omk/bin
./ophad cmd producer start

7. 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)