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MongoDB

3.6.17

3.6.17

Configuring MongoDB in a PLOSSYS 5 Cluster

Configuring MongoDB in a PLOSSYS 5 Cluster¶

Caution - the same database

All servers in a cluster must use the same database.

Configuring a Shared Replica Set¶

For the communication within the cluster, configure the database servers with a shared replica set.

Perform the following configuration steps on <server_1>, <server_2> and <server_3>:

Edit the MongoDB configuration file:
```
/opt/seal/etc/mongod.conf
```
Change the following line:
```
bindIp: 127.0.0.1
```
to:
```
bindIp: 0.0.0.0
```
Add the following lines:
```
replication:
  oplogSizeMB: 2048
  replSetName: <YourReplicaSetName>
```
Hint - oplogSizeMB

We recommend setting oplogSizeMB to 5 % of the disk space available for MongoDB.
Restart the MongoDB:
```
mongod
```

Initializing the Database Cluster¶

Perform the following configuration step on <server_1>:

Initialize the cluster on <server_1>:

sudo mongo --ssl --sslAllowInvalidCertificates --eval "rs.initiate({ _id : '<YourReplicaSetName>', members: [{ _id : 0, host : '<server_1>' }]})"

The output has to contain the following line:

"ok" : 1

Connecting the Database Server to the Cluster¶

After initializing the database cluster on <server_1>, add the other servers.

Perform the following configuration steps on <server_1>:

Add <server_2> to the cluster:
```
sudo mongo --ssl --sslAllowInvalidCertificates --eval "rs.add('<server_2>')"
```
The output has to contain the following line::

"ok" : 1
Add <server_3> to the cluster:
```
sudo mongo --ssl --sslAllowInvalidCertificates --eval "rs.add('<server_3>')"
```
The output has to contain the following line::

"ok" : 1
Proceed until all servers are added.
Proceed until all servers are added.

Checking the Status of the Database Cluster¶

Execute the following command:
```
sudo mongo --ssl --sslAllowInvalidCertificates --eval 'printjson(rs.status())'
```
The output has to contain the following line:

"ok" : 1

Showing the Configuration of the Database Cluster¶

Execute the following command:

sudo mongo --ssl --sslAllowInvalidCertificates --eval 'printjson(rs.conf())'