Setting Up Database Monitoring for Self-Hosted MongoDB

Docs > Database Monitoring > Setting up MongoDB > Setting Up Database Monitoring for Self-Hosted MongoDB

Database Monitoring for MongoDB is in private beta. If you are interested in participating, reach out to your Datadog Customer Success Manager.

Database Monitoring provides deep visibility into your MongoDB databases by exposing database metrics, operation samples, explain plans, and events.

Before you begin

Supported MongoDB major versions: 4.4, 5.0, 6.0, 7.0
Supported Agent versions: 7.55.0+
Performance impact: The default Agent configuration for Database Monitoring is conservative, but you can adjust settings such as the collection interval and operation sampling rate to better suit your needs. For most workloads, the Agent represents less than one percent of query execution time on the database and less than one percent of CPU.
Connection strings or SRV strings: Although MongoDB connection strings or SRV strings provide many benefits such as automatic failover and load balancing, the Datadog Agent must connect directly to the MongoDB instance being monitored. If the Agent connects to a different MongoDB instance while it is running (as in the case of failover, load balancing, and so on), the Agent calculates the difference in statistics between two hosts, producing inaccurate metrics.
Data security considerations: Read about how Database Management handles sensitive information for information about what data the Agent collects from your databases and how to ensure it is secure.

Setup

To enable Database Monitoring for your database:

Grant the Agent access to your MongoDB instances
Install and configure the Agent

Grant the Agent access to your MongoDB instances

The Datadog Agent requires read-only access to the MongoDB instance to collect statistics and queries.

In a Mongo shell, authenticate to the MongoDB instance, create a read-only user for the Datadog Agent in the admin database, and grant the required permissions:

# Authenticate as the admin user.
use admin
db.auth("admin", "<YOUR_MONGODB_ADMIN_PASSWORD>")

# Create the user for the Datadog Agent.
db.createUser({
  "user": "datadog",
  "pwd": "<UNIQUE_PASSWORD>",
  "roles": [
    { role: "read", db: "admin" },
    { role: "read", db: "local" },
    { role: "clusterMonitor", db: "admin" }
  ]
})

Grant additional permissions to the datadog user in the databases you want to monitor:

db.grantRolesToUser("datadog", [
  { role: "read", db: "mydatabase" },
  { role: "read", db: "myotherdatabase" }
])

Alternatively, you can grant readAnyDatabase role to the datadog user in the admin database to monitor all databases:

db.grantRolesToUser("datadog", [
  { role: "readAnyDatabase", db: "admin" }
])

In a Mongo shell, authenticate to the primary node of the replica set, create a read-only user for the Datadog Agent in the admin database, and grant the required permissions:

# Authenticate as the admin user.
use admin
db.auth("admin", "<YOUR_MONGODB_ADMIN_PASSWORD>")

# Create the user for the Datadog Agent.
db.createUser({
  "user": "datadog",
  "pwd": "<UNIQUE_PASSWORD>",
  "roles": [
    { role: "read", db: "admin" },
    { role: "read", db: "local" },
    { role: "clusterMonitor", db: "admin" }
  ]
})

Grant additional permissions to the datadog user in the databases you want to monitor:

db.grantRolesToUser("datadog", [
  { role: "read", db: "mydatabase" },
  { role: "read", db: "myotherdatabase" }
])

Alternatively, you can grant readAnyDatabase role to the datadog user in the admin database to monitor all databases:

db.grantRolesToUser("datadog", [
  { role: "readAnyDatabase", db: "admin" }
])

For each shard in your cluster, connect to the primary node of the shard, create a read-only user for the Datadog Agent in the admin database, and grant the required permissions:

# Authenticate as the admin user.
use admin
db.auth("admin", "<YOUR_MONGODB_ADMIN_PASSWORD>")

# Create the user for the Datadog Agent.
db.createUser({
  "user": "datadog",
  "pwd": "<UNIQUE_PASSWORD>",
  "roles": [
    { role: "read", db: "admin" },
    { role: "read", db: "local" },
    { role: "clusterMonitor", db: "admin" }
  ]
})

Grant additional permissions to the datadog user in the databases you want to monitor:

db.grantRolesToUser("datadog", [
  { role: "read", db: "mydatabase" },
  { role: "read", db: "myotherdatabase" }
])

Alternatively, you can grant the readAnyDatabase role to the datadog user in the admin database to monitor all databases:

db.grantRolesToUser("datadog", [
  { role: "readAnyDatabase", db: "admin" }
])

Follow the same steps and create the same user from a mongos proxy. This action creates the local user in the config servers and allows direct connection.

Install and configure the Agent

Datadog recommends installing the Agent directly on the MongoDB host, as that enables the Agent to collect a variety of system telemetry (CPU, memory, disk, network) in addition to MongoDB specific telemetry.

Install the beta version of the Datadog Agent

The Database Monitoring feature for MongoDB is available in the beta version of the Datadog Agent. To install the beta version of the Datadog Agent, follow the instructions for your environment. A Datadog API key is required.

To install the beta version of the Datadog Agent on a Linux host, run the following command. Replace <DD_API_KEY> with your Datadog API key and <DD_SITE> with your Datadog site.

# Override the following environment variables
export DD_REPO_URL=datad0g.com
export DD_AGENT_DIST_CHANNEL=beta
export DD_AGENT_MAJOR_VERSION=7
export DD_AGENT_MINOR_VERSION="56.0~dbm~mongo~1.3"

DD_API_KEY=<DD_API_KEY> DD_SITE=<DD_SITE> bash -c "$(curl -L https://install.datadoghq.com/scripts/install_script_agent7.sh)"

To install the beta version of the containerized Datadog Agent, run the following command. Replace <DD_API_KEY> with your Datadog API key and <DD_SITE> with your Datadog site.

# Override the following environment variables
export DD_API_KEY=<DD_API_KEY>
export DD_SITE=<DD_SITE>
export DD_AGENT_VERSION=7.56.0-dbm-mongo-1.3

docker pull "datadog/agent:${DD_AGENT_VERSION}"

To install the beta version of the Datadog Agent on Kubernetes, run the following command. Replace <DD_API_KEY> with your Datadog API key and <DD_SITE> with your Datadog site.

# Override the following environment variables
export DD_API_KEY=<DD_API_KEY>
export DD_SITE=<DD_SITE>

helm repo add datadog https://helm.datadoghq.com
helm repo update
kubectl create secret generic datadog-secret --from-literal api-key="${DD_API_KEY}"

Create a values.yaml file with the following content:

datadog:
  agents:
    image:
      tag: 7.56.0-dbm-mongo-1.3
  registry: datadog/agent
  apiKeyExistingSecret: datadog-secret

Create the configuration file

To configure the Agent to monitor a standalone MongoDB instance, use the following configuration block:

init_config:
instances:
    ## @param hosts - required
    ## Specify the hostname, IP address, or UNIX domain socket
    ## of the standalone mongod instance. If the port number
    ## is not specified, the default port 27017 is used.
    #
  - hosts:
      - <HOST>:<PORT>

    ## @param username - string - optional
    ## The username to use for authentication.
    #
    username: datadog

    ## @param password - string - optional
    ## The password to use for authentication.
    #
    password: <UNIQUEPASSWORD>

    ## @param options - mapping - optional
    ## Connection options. For a complete list, see:
    ## https://docs.mongodb.com/manual/reference/connection-string/#connections-connection-options
    #
    options:
      authSource: admin

    ## @param tls - boolean - optional
    ## Set to true to connect to the MongoDB instance using TLS.
    #
    tls: true

    ## @param dbm - boolean - optional
    ## Set to true to enable Database Monitoring.
    #
    dbm: true

    ## @param cluster_name - string - optional
    ## The unique name of the cluster to which the monitored MongoDB instance belongs.
    ## Used to group MongoDB instances in a MongoDB cluster.
    ## Required when `dbm` is enabled.
    #
    cluster_name: <MONGO_CLUSTER_NAME>

    ## @param reported_database_hostname - string - optional
    ## Set the reported database hostname for the connected MongoDB instance.
    ## This value overrides the MongoDB hostname detected by the Agent
    ## from the MongoDB admin command serverStatus.host.
    #
    reported_database_hostname: <DATABASE_HOSTNAME_OVERRIDE>

    ## @param additional_metrics - list of strings - optional
    ## List of additional metrics to collect. Available options are:
    ## - metrics.commands: Use of database commands
    ## - tcmalloc: TCMalloc memory allocator
    ## - top: Usage statistics for each collection
    ## - collection: Metrics of the specified collections
    #
    additional_metrics: ["metrics.commands", "tcmalloc", "top", "collection"]

    ## @param collections_indexes_stats - boolean - optional
    ## Set to true to collect index statistics for the specified collections.
    ## Requires `collections` to be set.
    #
    collections_indexes_stats: true

    ## @param database_autodiscovery - mapping - optional
    ## Enable database autodiscovery to automatically collect metrics from all your MongoDB databases.
    #
    database_autodiscovery:
      ## @param enabled - boolean - required
      ## Enable database autodiscovery.
      #
      enabled: true

      ## @param include - list of strings - optional
      ## List of databases to include in the autodiscovery. Use regular expressions to match multiple databases.
      ## For example, to include all databases starting with "mydb", use "^mydb.*".
      ## By default, include is set to ".*" and all databases are included.
      #
      include:
        - "^mydb.*"

      ## @param exclude - list of strings - optional
      ## List of databases to exclude from the autodiscovery. Use regular expressions to match multiple databases.
      ## For example, to exclude all databases starting with "mydb", use "^mydb.*".
      ## When the exclude list conflicts with include list, the exclude list takes precedence.
      #
      exclude:
        - "^mydb2.*"
        - "admin$"

      ## @param max_databases - integer - optional
      ## Maximum number of databases to collect metrics from. The default value is 100.
      #
      max_databases: 100

      ## @param refresh_interval - integer - optional
      ## Interval in seconds to refresh the list of databases. The default value is 600 seconds.
      #
      refresh_interval: 600

To monitor a MongoDB replica set, the Agent needs to connect to all members (including the arbiter) of the replica set.

Use the following configuration block as an example to configure the Agent to connect to a replica set member:

init_config:
instances:
    ## @param hosts - required
    ## Specify the hostname, IP address, or UNIX domain socket of
    ## a mongod instance as listed in the replica set configuration.
    ## If the port number is not specified, the default port 27017 is used.
    #
  - hosts:
      - <HOST>:<PORT>  # Primary node

    ## @param username - string - optional
    ## The username to use for authentication.
    #
    username: datadog

    ## @param password - string - optional
    ## The password to use for authentication.
    #
    password: <UNIQUE_PASSWORD>

    ## @param options - mapping - optional
    ## Connection options. For a complete list, see:
    ## https://docs.mongodb.com/manual/reference/connection-string/#connections-connection-options
    #
    options:
      authSource: admin

    ## @param tls - boolean - optional
    ## Set to true to connect to the MongoDB instance using TLS.
    #
    tls: true

    ## @param dbm - boolean - optional
    ## Set to true to enable Database Monitoring.
    #
    dbm: true

    ## @param cluster_name - string - optional
    ## The unique name of the cluster to which the monitored MongoDB instance belongs.
    ## Used to group MongoDB instances in a MongoDB cluster.
    ## Required when `dbm` is enabled.
    #
    cluster_name: <MONGO_CLUSTER_NAME>

    ## @param reported_database_hostname - string - optional
    ## Set the reported database hostname for the connected MongoDB instance.
    ## This value overrides the MongoDB hostname detected by the Agent
    ## from the MongoDB admin command serverStatus.host.
    #
    reported_database_hostname: <DATABASE_HOSTNAME_OVERRIDE>


    ## @param additional_metrics - list of strings - optional
    ## List of additional metrics to collect. Available options are:
    ## - metrics.commands: Use of database commands
    ## - tcmalloc: TCMalloc memory allocator
    ## - top: Usage statistics for each collection
    ## - collection: Metrics of the specified collections
    #
    additional_metrics: ["metrics.commands", "tcmalloc", "top", "collection"]

    ## @param collections_indexes_stats - boolean - optional
    ## Set to true to collect index statistics for the specified collections.
    ## Requires `collections` to be set.
    #
    collections_indexes_stats: true

    ## @param database_autodiscovery - mapping - optional
    ## Enable database autodiscovery to automatically collect metrics from all your MongoDB databases.
    #
    database_autodiscovery:
      ## @param enabled - boolean - required
      ## Enable database autodiscovery.
      #
      enabled: true

      ## @param include - list of strings - optional
      ## List of databases to include in the autodiscovery. Use regular expressions to match multiple databases.
      ## For example, to include all databases starting with "mydb", use "^mydb.*".
      ## By default, include is set to ".*" and all databases are included.
      #
      include:
        - "^mydb.*"

      ## @param exclude - list of strings - optional
      ## List of databases to exclude from the autodiscovery. Use regular expressions to match multiple databases.
      ## For example, to exclude all databases starting with "mydb", use "^mydb.*".
      ## When the exclude list conflicts with include list, the exclude list takes precedence.
      #
      exclude:
        - "^mydb2.*"
        - "admin$"

      ## @param max_databases - integer - optional
      ## Maximum number of databases to collect metrics from. The default value is 100.
      #
      max_databases: 100

      ## @param refresh_interval - integer - optional
      ## Interval in seconds to refresh the list of databases. The default value is 600 seconds.
      #
      refresh_interval: 600

An example configuration for a replica set with 1 primary and 2 secondaries is as follows:

init_config:
instances:
  - hosts:
      - <HOST_REPLICA_1>:<PORT>  # Primary node
    username: datadog
    password: <UNIQUE_PASSWORD>
    options:
      authSource: admin
    tls: true
    dbm: true
    cluster_name: <MONGO_CLUSTER_NAME>
    reported_database_hostname: <DATABASE_HOSTNAME_OVERRIDE>
    additional_metrics: ["metrics.commands", "tcmalloc", "top", "collection"]
    collections_indexes_stats: true
    database_autodiscovery:
      enabled: true
  - hosts:
      - <HOST_REPLICA_2>:<PORT>  # Secondary node
    username: datadog
    password: <UNIQUE_PASSWORD>
    options:
      authSource: admin
    tls: true
    dbm: true
    cluster_name: <MONGO_CLUSTER_NAME>
    reported_database_hostname: <DATABASE_HOSTNAME_OVERRIDE>
    additional_metrics: ["metrics.commands", "tcmalloc", "top", "collection"]
    collections_indexes_stats: true
    database_autodiscovery:
      enabled: true
  - hosts:
      - <HOST_REPLICA_3>:<PORT>  # Secondary node
    username: datadog
    password: <UNIQUE_PASSWORD>
    options:
      authSource: admin
    tls: true
    dbm: true
    cluster_name: <MONGO_CLUSTER_NAME>
    reported_database_hostname: <DATABASE_HOSTNAME_OVERRIDE>
    additional_metrics: ["metrics.commands", "tcmalloc", "top", "collection"]
    collections_indexes_stats: true
    database_autodiscovery:
      enabled: true

To monitor a MongoDB sharded cluster, the Agent needs to connect to the mongos router(s) and all members of the shards. If you have multiple mongos routers, you can configure the Agent to connect to them for load balancing.

Use the following configuration block as an example to configure the Agent to connect to a Mongos router:

init_config:
instances:
    ## @param hosts - required
    ## For a sharded cluster, you need one check instance for each mongod instance in
    ## each shard (including the configsvr shard) as well as one additional check instance
    ## that connects to at least one mongos node.

    ## Specify the hostname, IP address, or UNIX domain socket of the mongod or mongos instance.

    ## If the port number is not specified, the default port 27017 is used.
  - hosts:
      - <HOST>:<PORT>

    ## @param username - string - optional
    ## The username to use for authentication.
    #
    username: datadog

    ## @param password - string - optional
    ## The password to use for authentication.
    #
    password: <UNIQUE_PASSWORD>

    ## @param options - mapping - optional
    ## Connection options. For a complete list, see:
    ## https://docs.mongodb.com/manual/reference/connection-string/#connections-connection-options
    #
    options:
      authSource: admin

    ## @param tls - boolean - optional
    ## Set to true to connect to the MongoDB instance using TLS.
    #
    tls: true

    ## @param dbm - boolean - optional
    ## Set to true to enable Database Monitoring.
    #
    dbm: true

    ## @param cluster_name - string - optional
    ## The unique name of the cluster to which the monitored MongoDB instance belongs.
    ## Used to group MongoDB instances in a MongoDB cluster.
    ## Required when `dbm` is enabled.
    #
    cluster_name: <MONGO_CLUSTER_NAME>

    ## @param reported_database_hostname - string - optional
    ## Set the reported database hostname for the connected MongoDB instance.
    ## This value overrides the MongoDB hostname detected by
    ## the Agent from the MongoDB admin command serverStatus.host.
    #
    reported_database_hostname: <DATABASE_HOSTNAME_OVERRIDE>

    ## @param database_autodiscovery - mapping - optional
    ## Enable database autodiscovery to automatically collect metrics from all your MongoDB databases.
    #
    database_autodiscovery:
      ## @param enabled - boolean - required
      ## Enable database autodiscovery.
      #
      enabled: true

      ## @param include - list of strings - optional
      ## List of databases to include in the autodiscovery. Use regular expressions to match multiple databases.
      ## For example, to include all databases starting with "mydb", use "^mydb.*".
      ## By default, include is set to ".*" and all databases are included.
      #
      include:
        - "^mydb.*"

      ## @param exclude - list of strings - optional
      ## List of databases to exclude from the autodiscovery. Use regular expressions to match multiple databases.
      ## For example, to exclude all databases starting with "mydb", use "^mydb.*".
      ## When the exclude list conflicts with include list, the exclude list takes precedence.
      #
      exclude:
        - "^mydb2.*"
        - "admin$"

      ## @param max_databases - integer - optional
      ## Maximum number of databases to collect metrics from. The default value is 100.
      #
      max_databases: 100

      ## @param refresh_interval - integer - optional
      ## Interval in seconds to refresh the list of databases. The default value is 600 seconds.
      #
      refresh_interval: 600

Refer to the Replica Set configuration for an example configuration for connecting to members in each shard and the config server.

An example configuration for a sharded cluster with 1 mongos router and 2 shards is as follows:

init_config:
instances:
  ## mongos router
  - hosts:
      - <HOST_MONGOS>:<PORT>
    username: datadog
    password: <UNIQUE_PASSWORD>
    options:
      authSource: admin
    tls: true
    dbm: true
    cluster_name: <MONGO_CLUSTER_NAME>
    reported_database_hostname: <DATABASE_HOSTNAME_OVERRIDE>
    additional_metrics: ["metrics.commands", "tcmalloc", "top", "collection", "jumbo_chunks"]
    database_autodiscovery:
      enabled: true
  ## Shard1
  - hosts:
      - <HOST_SHARD1_1>:<PORT>  # Primary node
    username: datadog
    password: <UNIQUE_PASSWORD>
    options:
      authSource: admin
    tls: true
    dbm: true
    cluster_name: <MONGO_CLUSTER_NAME>
    reported_database_hostname: <DATABASE_HOSTNAME_OVERRIDE>
    additional_metrics: ["metrics.commands", "tcmalloc", "top", "collection"]
    collections_indexes_stats: true
    database_autodiscovery:
      enabled: true
  - hosts:
      - <HOST_SHARD1_2>:<PORT>  # Secondary node
    username: datadog
    password: <UNIQUE_PASSWORD>
    options:
      authSource: admin
    tls: true
    dbm: true
    cluster_name: <MONGO_CLUSTER_NAME>
    reported_database_hostname: <DATABASE_HOSTNAME_OVERRIDE>
    additional_metrics: ["metrics.commands", "tcmalloc", "top", "collection"]
    collections_indexes_stats: true
    database_autodiscovery:
      enabled: true
  - hosts:
      - <HOST_SHARD1_3>:<PORT>  # Secondary node
    username: datadog
    password: <UNIQUE_PASSWORD>
    options:
      authSource: admin
    tls: true
    dbm: true
    cluster_name: <MONGO_CLUSTER_NAME>
    reported_database_hostname: <DATABASE_HOSTNAME_OVERRIDE>
    additional_metrics: ["metrics.commands", "tcmalloc", "top", "collection"]
    collections_indexes_stats: true
    database_autodiscovery:
      enabled: true
  ## Shard 2
  - hosts:
      - <HOST_SHARD2_1>:<PORT>  # Primary node
    username: datadog
    password: <UNIQUE_PASSWORD>
    options:
      authSource: admin
    tls: true
    dbm: true
    cluster_name: <MONGO_CLUSTER_NAME>
    reported_database_hostname: <DATABASE_HOSTNAME_OVERRIDE>
    additional_metrics: ["metrics.commands", "tcmalloc", "top", "collection"]
    collections_indexes_stats: true
    database_autodiscovery:
      enabled: true
  - hosts:
      - <HOST_SHARD2_2>:<PORT>  # Secondary node
    username: datadog
    password: <UNIQUE_PASSWORD>
    options:
      authSource: admin
    tls: true
    dbm: true
    cluster_name: <MONGO_CLUSTER_NAME>
    reported_database_hostname: <DATABASE_HOSTNAME_OVERRIDE>
    additional_metrics: ["metrics.commands", "tcmalloc", "top", "collection"]
    collections_indexes_stats: true
    database_autodiscovery:
      enabled: true
  - hosts:
      - <HOST_SHARD2_3>:<PORT>  # Secondary node
    username: datadog
    password: <UNIQUE_PASSWORD>
    options:
      authSource: admin
    tls: true
    dbm: true
    cluster_name: <MONGO_CLUSTER_NAME>
    reported_database_hostname: <DATABASE_HOSTNAME_OVERRIDE>
    additional_metrics: ["metrics.commands", "tcmalloc", "top", "collection"]
    collections_indexes_stats: true
    database_autodiscovery:
      enabled: true
  ## Config server
  - hosts:
      - <HOST_CONFIG_1>:<PORT>  # Primary node
    username: datadog
    password: <UNIQUE_PASSWORD>
    database: config
    options:
      authSource: admin
    tls: true
    dbm: true
    cluster_name: <MONGO_CLUSTER_NAME>
    reported_database_hostname: <DATABASE_HOSTNAME_OVERRIDE>
  - hosts:
      - <HOST_CONFIG_2>:<PORT>  # Secondary node
    username: datadog
    password: <UNIQUE_PASSWORD>
    database: config
    options:
      authSource: admin
    tls: true
    dbm: true
    cluster_name: <MONGO_CLUSTER_NAME>
    reported_database_hostname: <DATABASE_HOSTNAME_OVERRIDE>
  - hosts:
      - <HOST_CONFIG_3>:<PORT>  # Secondary node
    username: datadog
    password: <UNIQUE_PASSWORD>
    database: config
    options:
      authSource: admin
    tls: true
    dbm: true
    cluster_name: <MONGO_CLUSTER_NAME>

Set up the Agent

Place the MongoDB Agent configuration file created in the previous step in /etc/datadog-agent/conf.d/mongo.d/conf.yaml. See the sample conf file for all available configuration options.

Once all Agent configuration is complete, restart the Datadog Agent.

Validate

Run the Agent’s status subcommand and look for mongo under the Checks section. Navigate to the Databases page in Datadog to get started.

To configure the Database Monitoring Agent running in a Docker container, set the Autodiscovery Integration Templates as Docker labels on your Agent container.

The MongoDB check is included in the Datadog Agent. No additional installation is necessary.

Note: The Agent must have read permission on the Docker socket for autodiscovery of labels to work.

Add the configuration details for the MongoDB check from the previous step in the com.datadoghq.ad.checks label. See the sample conf file for all available configuration options.

export DD_API_KEY=<DD_API_KEY>
export DD_AGENT_VERSION=7.56.0-dbm-mongo-1.3

docker run -e "DD_API_KEY=${DD_API_KEY}" \
  -v /var/run/docker.sock:/var/run/docker.sock:ro \
  -l com.datadoghq.ad.checks='{
    "mongo": {
      "init_config": [{}],
      "instances": [{
        "hosts": ["<HOST>:<PORT>"],
        "username": "datadog",
        "password": "<UNIQUE_PASSWORD>",
        "options": {
          "authSource": "admin"
        },
        "dbm": true,
        "cluster_name": "<MONGO_CLUSTER_NAME>",
        "reported_database_hostname": "<DATABASE_HOSTNAME_OVERRIDE>",
        "database_autodiscovery": {
          "enabled": true
        }
      }]
    }
  }' \
  datadog/agent:${DD_AGENT_VERSION}

Validate

Run the Agent’s status subcommand and look for mongo under the Checks section. Navigate to the Databases page in Datadog to get started.

If you have a Kubernetes cluster, use the Datadog Cluster Agent for Database Monitoring.

If cluster checks are not already enabled in your Kubernetes cluster, follow the instructions to enable cluster checks. You can configure the Cluster Agent either with static files mounted in the Cluster Agent container, or by using Kubernetes service annotations.

Command line with Helm

Execute the following Helm command to install the Datadog Cluster Agent on your Kubernetes cluster. Replace the values to match your account and environment:

helm repo add datadog https://helm.datadoghq.com
helm repo update

helm install <RELEASE_NAME> \
  --set 'datadog.apiKey=<DATADOG_API_KEY>' \
  --set 'clusterAgent.enabled=true' \
  --set 'clusterChecksRunner.enabled=true' \
  --set "clusterAgent.confd.mongo\.yaml=cluster_check: true
init_config:
instances:
  - hosts:
      - <HOST>:<PORT>
    username: datadog
    password: <UNIQUE_PASSWORD>
    options:
      authSource: admin
    dbm: true
    cluster_name: <MONGO_CLUSTER_NAME>
    database_autodiscovery:
      enabled: true
    reported_database_hostname: <DATABASE_HOSTNAME_OVERRIDE>" \
  datadog/datadog

Configure with mounted files

To configure a cluster check with a mounted configuration file, mount the configuration file in the Cluster Agent container on the path: /conf.d/mongo.yaml:

cluster_check: true  # Make sure to include this flag
init_config:
instances:
  - hosts:
      - <HOST>:<PORT>
    username: datadog
    password: <UNIQUE_PASSWORD>
    options:
      authSource: admin
    dbm: true
    cluster_name: <MONGO_CLUSTER_NAME>
    reported_database_hostname: <DATABASE_HOSTNAME_OVERRIDE>
    database_autodiscovery:
      enabled: true

Configure with Kubernetes service annotations

Rather than mounting a file, you can declare the instance configuration as a Kubernetes Service. To configure this check for an Agent running on Kubernetes, create a Service in the same namespace as the Datadog Cluster Agent:

apiVersion: v1
kind: Service
metadata:
  name: mongodb-datadog-check-instances
  annotations:
    ad.datadoghq.com/mongo.checks: |
    {
      "mongo": {
        "init_config": [{}],
        "instances": [{
          "hosts": ["<HOST>:<PORT>"],
          "username": "datadog",
          "password": "<UNIQUE_PASSWORD>",
          "options": {
            "authSource": "admin"
          },
          "dbm": true,
          "cluster_name": "<MONGO_CLUSTER_NAME>",
          "database_autodiscovery": {
            "enabled": true
          },
          "reported_database_hostname": "<DATABASE_HOSTNAME_OVERRIDE>"
        }]
      }
    }    
spec:
  ports:
  - port: 27017
    protocol: TCP
    targetPort: 27017
    name: mongodb

The Cluster Agent automatically registers this configuration and begins running the MongoDB integration.

To avoid exposing the datadog user’s password in plain text, use the Agent’s secret management package and declare the password using the ENC[] syntax.