MongoDB - Capabilities and Limitations

Last updated March 13th, 2023

Objective

This page provides the technical capabilities and limitations of the Public Cloud Databases for MongoDB offer.

Capabilities and limitations

Supported regions

The Public Cloud Databases offer is available in the following regions:

• BHS (Beauharnois, Canada)
• DE (Frankfurt, Germany)
• GRA (Gravelines, France)
• UK (London, United Kingdom)
• SBG (Strasbourg, France)
• WAW (Warsaw, Poland)

MongoDB versions

The Public Cloud Databases offer supports the following MongoDB versions:

• MongoDB 4.2 (soon deprecated)
• MongoDB 4.4
• MongoDB 5.0
• MongoDB 6.0

MongoDB recommends always installing and using the latest stable version of MongoDB. See MongoDB Versioning for more information.

MongoDB Drivers

You can use anyone of the MongoDB-recommended driver to access your cluster.

Plans

Three plans are available:

• Essential
• Business
• Enterprise

Here is an overview of the various plans' capabilities:

Plan	Number of nodes	MongoDB License	BI Connector	Compass
Essential	1	Community	Not available	Available
Business	3 to 8	Community	Not available	Available
Enterprise	3 to 8	Enterprise	Available	Available

Your choice of plan affects the number of nodes your cluster can run as well as the MongoDB license type.

Nodes

• Essential: The cluster supports at most one node.
• Business or Enterprise: The cluster can support 3 to 8 nodes including optionally an analytics node.

License type

• Essential and Business plans use the MongoDB Community license.
• Enterprise plans upgrade your cluster so that it uses the MongoDB Enterprise license, giving you the capability to use the MongoDB BI Connector as well as MongoDB Compass.

License cost is included inside the service plans. You cannot bring your own licenses.

Hardware resources

Here are the node types you can choose from:

Name	Cores	Memory	Usable storage
db1-2	1	2 GB	From 40 GB to 120 GB
db1-4	2	4 GB	From 80 GB to 240 GB
db1-7	2	7 GB	From 160 GB to 480 GB
db1-15	4	15 GB	From 320 GB to 960 GB
db1-30	8	30 GB	From 640 GB to 1.92 TB
db1-60	16	60 GB	From 1.28 TB to 3.84 TB
db1-120	32	120 GB	From 2.56 TB to 4 TB

Right now, all nodes of a given cluster should be of the same type and live in the same regions.

Disk type

The type of storage available may vary according to the region your cluster lives in: see Availability of Public Cloud products for more information about block storage type availability depending on region. Thus, your cluster may be backed by e.g. High Speed or High Speed Gen2 block storage.

Also, the performance caracteristics of the various storage offerings may vary depending on e.g. the storage size your cluster uses: High Speed may offer better iops than High Speed Gen2 for some disk sizes. See Block Storage documentation for more information about those performance caracteristics.

Public Cloud Databases will select the most efficient disk type for your cluster depending on your cluster parameters.

Effective storage

The disk size listed above is the total disk size of the underlying machine, however, a small part of it goes towards the OS install.

We try hard to avoid "disk full" situations that could be harmful to cluster health. Therefore, The customer will :

1. receive a first email alert once cluster is reaching 80% storage capacity;
2. receive a second email alert once cluster is reaching 90% storage capacity;
3. have his database instance moved in "read-only" mode, meaning no more writes can be done.

Features

Network

MongoDB clusters are reachable through default port 27017.

Public as well as private networking (vRack) can be used for all the offers.

Ingress and Egress traffic are included in the service plans and unmetered.

Private network considerations

Here are some considerations to take into account when using private network:

• Network ports are created in the private network of your choice. Thus, further operations on that network might be restricted - e.g. you won’t be able to delete the network if you didn’t stop the Public Cloud Databases services first.
• DHCP must be enabled in your private network in order to launch MongoDB clusters in the said private network.
• When connecting from outside subnet, Openstack IP gateway must be enabled in the subnet use for the Database service. The customer is responsible for any other custom network setup.

Backups

Essential plan clusters are automatically backed up daily during their maintenance window. Backup retention is 1 day.

Business plan clusters are automatically backed up daily during their maintenance window. Backup retention is 7 days.

Enterprise plan clusters are automatically backed up daily during their maintenance window, with PITR support. Backup retention is 30 days with PITR capability for the last 24 hours.

Logs and Metrics

Logs and metrics are available via the OVHcloud Public Cloud Control Panel. As of today, you can't export Logs and metrics, neither plug them to a remote tool.

• Logs retention: 1000 lines of logs;
• Metrics retention: 1 calendar year.

Please note that if the database instance is deleted, logs and metrics are also automatically deleted.

Users and roles

Creation of users is allowed with the proposed roles:

Role	Database
backup	admin
clusterManager	admin
clusterMonitor	admin
clusterAdmin	admin
dbAdmin	User configured
dbAdminAnyDatabase	admin
dbOwner	User configured
enableSharding	User configured
hostManager	User configured
read	User configured
readWrite	User configured
readWriteAnyDatabase	admin
readAnyDatabase	admin
restore	admin
root	admin
userAdmin	User configured
userAdminAnyDatabase	admin

In order to properly manage your MongoDB cluster, some MongoDB users are set up in your clusters by OVHcloud:

• admin@admin is your initial user
• mms-automation@admin is a technical user required for automation purposes
• backup-*@admin are used to perform backups

Furthermore, user creation from the MongoDB Shell is not supported: You need to use the OVHcloud API or the OVHcloud Control Panel in order to manage your clusters' users. Any user created through the mongo shell will be deleted by the automation mechanism.

We want your feedback!

We would love to help answer questions and appreciate any feedback you may have. Join our community of users on https://community.ovh.com/en/.

Are you on Discord? Connect to our channel at https://discord.gg/ovhcloud and interact directly with the team that builds our databases service!

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