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title: MongoDB Configuration & Scaling FAQ | abcdesktop.io description: FAQ on MongoDB configuration for abcdesktop.io: increasing replica counts, StatefulSet scaling, and connection troubleshooting. keywords: MongoDB, replica set, scaling, StatefulSet, FAQ, abcdesktop, database, troubleshooting tags: - faq - mongodb - FAQ - MongoDB - database

MongoDB

How to Increase the MongoDB Replica Count

With a Helm Installation

To change the replica count for MongoDB using the Helm installation, extract the values file from the Helm chart if you have not already done so:

helm show values abcdesktop/abcdesktop  > abcdesktop-values.yaml

Edit the mongo section and update the replicaCount key to the desired value:

mongo:
  enabled: true
  keysgenerator:
    image: ghcr.io/abcdesktopio/keysgenerator
    tag: 4.4
    mongodkeylength: 756
  # data:
  #   initContainerScriptPath: "data/mongo/init-container.sh"
  #   configFilePath: "data/mongo/etc/mongodb/mongod.conf"
  #   initScriptPath: "data/mongo/docker-entrypoint-initdb.d/init.js"
  #   initReplicaScriptPath: "data/mongo/docker-entrypoint-initdb.d/init-replica.sh"
  image:
    repository: ghcr.io/abcdesktopio/mongo
    tag: "safe8.0"
    pullPolicy: Always
  replicaCount: 3
  resources:
    limits:
      cpu: 500m
      memory: 512Mi
    requests:
      cpu: 100m
      memory: 128Mi
  # Persistence - MongoDB data storage configuration
  persistence:
    # enabled: true for persistent volume, false for non-persistent volume (emptyDir)
    enabled: false
    # Storage class to use (leave empty for default class)
    storageClass: ""
    # Persistent volume size
    size: 8Gi
    # Mount path in the container (do not change)
    mountPath: /data/db

Then apply the updated values:

NAMESPACE=abcdesktop
helm upgrade --install my-abcdesktop abcdesktop/abcdesktop \
    --version 4.4 \
    --create-namespace \
    -n ${NAMESPACE} \
    -f abcdesktop-values.yaml
where NAMESPACE and my-abcdesktop are your deployment namespace and release name.

With a Scripted Installation

  • Open your abcdesktop.yaml file and locate the StatefulSet named mongodb-od:
apiVersion: apps/v1
kind: StatefulSet
metadata:
 name: mongodb-od
  • In the spec of the StatefulSet named mongodb-od, update the replicas count:
apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: mongodb-od
  labels:
    run: mongodb-od
    type: database
    abcdesktop/role: mongodb
    netpol/mongodb: 'true'
    netpol/dns: 'true'
spec:
  serviceName: mongodb
  replicas: 3
  • In the name: replica-manager container definition, update the REPLICAS environment variable to match the same value:
 env:
   - name: NAMESPACE
     valueFrom:
       fieldRef:
         fieldPath: metadata.namespace
   - name: SERVICE
     value: mongodb
   - name: STATEFULSET_NAME
     value: mongodb-od
   - name: REPLICAS
     value: "3"
  • Apply your changes to the abcdesktop namespace:
NAMESPACE=abcdesktop
kubectl apply -f abcdesktop.yaml -n $NAMESPACE
  • Verify the number of running replicas:
kubectl get statefulset -l run=mongodb-od -n abcdesktop

The output should show all replicas in the READY state:

NAME         READY   AGE
mongodb-od   3/3     18h