Configure MongoDB in a Cluster¶

All PLOSSYS 5 servers in a cluster have to use the same database.

Configure a Shared Replica Set¶

For the communication among each other, configure the database servers with a shared replica set.

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

Open 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: p5
```
Hint - oplogSizeMB

We recommend setting oplogSizeMB to 5 % of the disk space available for MongoDB.
Restart the following service:
- seal-mongodb

Initialize the Database Cluster¶

Perform the following configuration step on <server_1>:

Initialize the cluster on <server_1>:

sudo mongo --ssl --sslAllowInvalidCertificates --sslAllowInvalidHostnames --eval "rs.initiate({ _id : 'p5', members: [{ _id : 0, host : '<server_1>' }]})"

The output has to contain the following line:

"ok" : 1

Connect 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 --sslAllowInvalidHostnames --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 --sslAllowInvalidHostnames --eval "rs.add('<server_3>')"

The output has to contain the following line::

"ok" : 1

Configure Access to the Cluster in PLOSSYS 5¶

Perform the following configuration steps on <server_1>:

Export the configuration of PLOSSYS 5:

plossys config export <plossys_5_backup>.yml

Hint - more options

For more information about the export via PLOSSYS CLI, refer to Administrate the System Configuration.

In the file with the exported configuration, <plossys_5_backup>.yml, change the MONGO_JOBS_URL, MONGO_EVENTS_URL and MONGO_PRINTERS_URL keys according to the following scheme:

service:
  any:
    tag:
      any:
        MONGO_ACTIONS_URL: mongodb://<server_1>,<server_2>,<server_3>/spooler-actions?replicaSet=p5
        MONGO_CONFIGS_URL: mongodb://<server_1>,<server_2>,<server_3>/spooler-configs?replicaSet=p5
        MONGO_EVENTS_URL: mongodb://<server_1>,<server_2>,<server_3>/spooler-events?replicaSet=p5
        MONGO_JOBS_URL: mongodb://<server_1>,<server_2>,<server_3>/spooler-jobs?replicaSet=p5
        MONGO_LOCKS_URL: mongodb://<server_1>,<server_2>,<server_3>/spooler-locks?replicaSet=p5
        MONGO_PREPROCESS_URL: mongodb://<server_1>,<server_2>,<server_3>/spooler-preprocess?replicaSet=p5
        MONGO_PRINTERS_URL: mongodb://<server_1>,<server_2>,<server_3>/spooler-printers?replicaSet=p5

Save the file.
Import the changed configuration:
```
plossys config import <plossys_5_backup>.yml
```
Hint - more options

For more information about the import via PLOSSYS CLI, refer to Administrate the System Configuration.

Check the Status of the Database Cluster¶

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

The output has to contain the following line:

"ok" : 1

Show the Configuration of the Database Cluster¶

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