Configuring MongoDB for SCG

– only versions < SCG 1 2209 –

Requires

Node.js, debconf-utils, the other tools and MongoDB are installed.

Start the MongoDB service.
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```
systemctl start mongod
```

Create a MongoDB user account with username scg_admin and define a password for it.

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mongo

> use admin
> db.createUser(
  {
    user: "scg_admin",
    pwd: "<scg_admin_password>",
    roles: [{role: 'userAdminAnyDatabase', db: 'admin'}, {role: 'readWriteAnyDatabase', db: 'admin'}, {role: 'clusterManager', db: 'admin'}]
  }
)
> exit

Configure the MongoDB database:
1. Edit the /etc/mongod.conf file and ensure that the relevant values are set for network, security and cluster.
  
  Replace <hostname> with the hostname of your SCG machine (to be identified via hostname command).
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```
net:
  port: 27017
  bindIp: 127.0.0.1,<hostname>
security:
  authorization: enabled
  keyFile: /etc/mongod.keyfile
replication:
  replSetName: "rs0"
```
2. Create a file named mongod.keyfile
  
  Replace <Base64ReplicaSetKey> with a Base64 string.
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```
echo "<Base64ReplicaSetKey>" | tee /etc/mongod.keyfile
chown mongodb:mongodb /etc/mongod.keyfile
chmod 600 /etc/mongod.keyfile
```
3. Restart the mongod service.
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```
systemctl restart mongod
```

Create a replica set with the desired number of members/instances. Replace the password parameter with your MongoDB user password defined above. If required, add more instances.

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mongo -u scg_admin -p <scg_admin_password>
> rs.status()
// should print out: "no replset config has been received"
> rs.initiate({_id: "rs0", members: [{_id: 0, host: "<hostname>"}]})
> exit