Atlas Production Best Practices¶
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With MongoDB Atlas as your data platform, operational focus can shift away from the mundane operational tasks and workflows required to build and maintain database infrastructure, allowing you to focus on helping engineers add value to the business. Instead of maintaining hardware and keeping up with operating system-level software patches, engineers can devote their time and energy to developing data models that meet the current and future requirements of your enterprise.
This document outlines some best practices for establishing and maintaining a successful MongoDB production deployment using MongoDB Atlas clusters.
Roles and Responsibilities¶
MongoDB manages and operates the infrastructure required to provide a MongoDB Database Service to the customer. MongoDB's responsibilities include the following:
- Manage the database clusters and underlying infrastructure, ensuring
availability, stability, and performance of MongoDB, backed by a
Uptime Service Level Agreement (SLA)
for clusters of size
- Ensure the health of the underlying compute nodes. Make sure they are running, have network connectivity, and have all recommended OS-level patches to maintain the Uptime SLA.
- Manage the MongoDB database configuration based on the customer's specific design choices made via the Atlas user interface or REST API.
- Apply all MongoDB maintenance upgrades automatically to ensure the latest bug fixes to the product are in use.
- Manage the security profile, including Role-Based Access Control, adding IP addresses to an IP access list, and peering to maximize cluster security per the customer's direction.
- Provide backup and restore services.
The customer continues to develop and deploy applications which access MongoDB, without having to directly manage the underlying database resources and/or infrastructure.
Organization and Project-Level Management¶
MongoDB Atlas abstracts away database operations so that you can focus on high-value, high-level management decisions.
Creating a well-designed hierarchy of organizations and projects within Atlas allows for maximum enterprise efficiency with minimum operational friction.
If you need to create more than the Atlas organization limit of 250 projects, create additional organizations to store them.
Use Cross-Organization Billing to link multiple Atlas organizations and receive a single invoice for all of them.
The Organization Level¶
To efficiently control user access and privileges, you can group users into teams at the Organization level.
The Project Level¶
Projects offer a security isolation and authorization boundary, so they are typically allocated by application team and application environment. For example, within two application teams there might be six projects: one for each team in the Development, Staging, and Production environments.
You can create project-level Atlas users and roles with appropriate access to the different production and development application environments.
- Users with the
Project Read Onlyrole can access project-level monitoring and system health metadata without having access to any collection data or administrative operations.
- Users with the
Project Cluster Managerrole can scale clusters and perform other administrative operations, but have no data-level access.
Other project-level responsibilities include:
Implement optional enterprise security features, including:
Set up network access configuration, including:
- Define appropriate database alerts via the Atlas interface or API and respond to any which require attention.
Integrate with external monitoring/alerting systems, such as DataDog and New Relic.Important
Effective Wednesday, June 16th, 2021, New Relic no longer supports the plugin-based integration with MongoDB. We do not recommend that you sign up for the plugin-based integration.
To learn more, see the New Relic Plugin EOL Statement. Consider configuring an alternative monitoring integration before June 16th to maintain visibility into your MongoDB deployments.
Application-level responsibilities include:
- Schema design, including query and index optimization.
- Cluster tier and topology selection. Choosing the appropriate cluster size and topology (replica set or sharded cluster), along with storage capacity and IOPS is crucial for optimal database performance.
- Provisioning of non-production clusters. Production backups can be restored into non-production clusters with the Atlas UI or the API.
- Capacity planning. Determining when additional computational capacity is needed, typically using the monitoring telemetry that Atlas provides. Additional capacity can be added with no application downtime, and you can optionally enable auto-scaling to respond automatically to spikes in usage.
- Deciding when to implement a major database version upgrade.
- Implementing and testing a backup and restoration plan.
- Ensuring that applications gracefully handle cluster failover through testing.
- Configuring data analytics services with tools such as BI Connector and Charts.
MongoDB Atlas offers two methods for scaling, vertical and horizontal.
Vertical scaling involves increasing a cluster's storage capacity,
computing power, and/or IOPS rate. Vertical scaling can be
accomplished quickly and is useful for peak usage periods. Vertically
scaling from shared clusters (
M5) requires a few minutes of downtime whereas scaling between
dedicated clusters (
M10 and greater)
happens without downtime.
When scaling vertically,
M30 and higher clusters are recommended for
production environments. You can use the following cluster tiers as
production environments for low-traffic applications, but these tiers
are recommended for development environments:
Horizontal scaling involves implementing
sharding or adding shards in an
existing sharded cluster. Horizontal scaling requires careful planning
and execution, and is part of a long-term growth strategy for
clusters. You can also reduce the number of shards in a sharded cluster.
When you remove a shard, Atlas uses the movePrimary command to move any unsharded databases in that shard to a remaining shard.
All sharded collections remain online and available during the shard removal
process. However, read or write operations to unsharded collections during
movePrimary operation can result in unexpected behavior, including
migration failure or data loss.
We recommend moving the primary shard for any databases containing unsharded collections before removing the shard.
For more information, see Remove Shards from an Existing Sharded Cluster.
Vertical and horizontal sharding can be combined in Atlas. For example, a sharded cluster can be vertically scaled up for a peak period, increasing the storage capacity and computing power of the individual sharded cluster members.
By default, Atlas vertically auto-scales cluster storage up to your configured cluster tier size limit.
You can configure Atlas to automatically scale your cluster tier and cluster storage capacity in response to increased cluster usage, allowing for a rapid, automated response to a need for greater storage computing power.
Single Region and Multi-Region Clusters¶
High availability and cluster durability depend on a cluster's geographical deployment configuration. Clusters which are deployed within a single region are spread across availability zones within that region, so they can withstand partial region outages without an interruption of read or write availability.
You can optionally choose to spread your clusters across two or more regions for greater resiliency and workload isolation.
The order of regions determines the priority order for the location of the primary node. Therefore, if you wish to direct database write operations to a particular region when that region is available, you should list that region first. The second region on the list should be the second choice for where writes should go if the first region is unavailable.
The following example from the Atlas Create a Cluster UI shows a multi-region cluster with electable nodes in three different regions, arranged by priority from highest to lowest:
If the us-east-1 region becomes unavailable, a new primary will be elected in the us-west-1 region.
Clusters must have an odd number of nodes to ensure primary electability. To learn more, see Replica Set Elections.
Deployment in Two Regions¶
Deploying a cluster to two regions ensures that a copy of your data will always be maintained in more than one region. However, a loss of the region which contains a majority of the nodes in the cluster will leave the second region in a read-only state until an administrator intervenes or the original region becomes available.
Deployment in Three or More Regions¶
Deploying a cluster to three or more regions ensures that the cluster can withstand a full region-level outage while maintaining read and write availability, provided the application layer is fault-tolerant.
If maintaining write operations in your preferred region at all times is a high priority, it is recommended to deploy the cluster so that at least two electable members are in at least two data centers within your preferred region.
For the best database performance in a worldwide deployment, users can configure a global cluster which uses location-aware sharding to minimize read and write latency. Users with geographical storage requirements can also ensure that data is stored in a particular geographical area.
Auditing Temporary Database Users¶
Enabling auditing for all database users, including application service users, might severely affect cluster performance. If you need to audit the actions of a temporary database user, you can create a custom role targeted for auditing, create a temporary user with elevated privileges, and grant this user the custom role to audit their actions.
To audit the actions of a temporary database user:
Create a temporary user.¶
To audit their actions, create a temporary user.
Assign the user the custom role you created for auditing. When you create the user, select the Save as temporary user option, then select the period of time you want the user to exist. When this period elapses, Atlas deletes the user.
Add a temporary IP access list entry.¶
Add a temporary IP access list entry to limit the temporary user's access to Atlas clusters.
When you create the IP access list entry for the temporary user, select the Save as temporary access list option, then select the period of time you want the access list entry to exist. When this period elapses, Atlas deletes the access list entry.
Cluster Naming Conventions¶
Choosing the right naming convention for your Atlas clusters is a good first step towards running a successful production environment. Once you've named a cluster you can't rename it, so it's important to get it right the first time. The following suggestions can make it easier to parse logs and differentiate clusters.
- Use descriptive, lowercase names.
- Avoid special characters.
- Join words with hyphens or underscores. Avoid blank spaces between words.
- Use a convention which makes it clear whether a cluster is for production, staging, or development purposes.
Some examples of good cluster names:
Different tiers of support are available, including options for customers in development and for enterprise customers.
Possible support areas include:
- Issues and concerns with the MongoDB clusters under management.
- Performance-related inquiries.
- Application-side and driver consultation.