MongoDB Telemetry Data to KloudMate Using OpenTelemetry Collector

8min
This document provides a guide on how to send MongoDB telemetry data to KloudMate using OpenTelemetry Collector.
In the described setup, the latest MongoDB instance is running on an EC2 server. An exporter is required to export metrics to a monitoring backend. In this process, the metrics will be exported by the MongoDB exporter and the penTelemetry collector will be responsible to send metrics data to KloudMate backend.
Step 1: Prerequisites:
MongoDb installed and running on http://127.0.0.1:27017﻿
Install OpenTelemetry collector. See Installing and Configuring OpenTelemetry Collector.
Recommendations: Install otelcol-contrib releases.
Step 2: Install and configure MongoDB exporter:
Add user and group for exporter
Text
$sudo groupadd --system <mongodbuser>
$sudo useradd -s /sbin/nologin --system -g <mongodbuser> <mongodbuser>
$sudo groupadd --system <mongodbuser>
$sudo useradd -s /sbin/nologin --system -g <mongodbuser> <mongodbuser>
﻿
Download and extract MongoDB Exporter
Text
$wget https://github.com/percona/mongodb_exporter/releases/download/v0.39.0/mongodb_exporter-0.39.0.linux-amd64.tar.gz   
 /$tar xvzf mongodb_exporter-<latest>
 $sudo mv mongodb_exporter /usr/local/bin/

$wget https://github.com/percona/mongodb_exporter/releases/download/v0.39.0/mongodb_exporter-0.39.0.linux-amd64.tar.gz   
 /$tar xvzf mongodb_exporter-<latest>
 $sudo mv mongodb_exporter /usr/local/bin/
﻿
Enable MongoDB authentication
Text
$mongosh
>use admin
>db.createUser({ user: "USER", pwd: "PASSWORD", roles: [{ role: "clusterMonitor", db: "admin" }] })
>exit
$mongosh
>use admin
>db.createUser({ user: "USER", pwd: "PASSWORD", roles: [{ role: "clusterMonitor", db: "admin" }] })
>exit
﻿
Create a system file for the MongoDB exporter and run it as a service.
Text
$sudo nano /etc/systemd/system/mongodb_exporter.service
$sudo nano /etc/systemd/system/mongodb_exporter.service
﻿
[Unit]
Description=MongoDB Exporter

[Service]
User=<mongodbuser>
Type=simple
Restart=always
ExecStart=/usr/local/bin/mongodb_exporter --mongodb.uri=mongodb://USER:[email protected]:27017 --collect-all --compatible-mode

[Install]
WantedBy=multi-user.target
Text
$sudo systemctl daemon-reload
$sudo systemctl start mongodb_exporter.service
$sudo systemctl status mongodb_exporter.service 

$sudo systemctl daemon-reload
$sudo systemctl start mongodb_exporter.service
$sudo systemctl status mongodb_exporter.service 
﻿
Step 3: Test the available metrics.
Text
$curl http://localhost:9216/metrics
$curl http://localhost:9216/metrics
﻿
Step 4: On the OpenTelemetry collector add the MongoDB exporter path on Prometheus receiver and export to KloudMate backend. 
YAML
receivers:
  prometheus:
    config:
      scrape_configs:
      - job_name: 'prod-mongodb'
        scrape_interval: 10s
        static_configs:
          - targets: ['localhost:9216']
exporters:  
  otlphttp:
    endpoint: 'https://otel.kloudmate.com:4318'
    headers:
      Authorization: <xxxxxxxxxxxxxxxxxxx>

receivers:
  prometheus:
    config:
      scrape_configs:
      - job_name: 'prod-mongodb'
        scrape_interval: 10s
        static_configs:
          - targets: ['localhost:9216']
exporters:  
  otlphttp:
    endpoint: 'https://otel.kloudmate.com:4318'
    headers:
      Authorization: <xxxxxxxxxxxxxxxxxxx>
﻿
Step 5: For logs, OpenTelemetry has a file log receiver that can export logs written on a file to a specific backend. Add the file log receiver and include the path of the file which needs to be exported.
YAML
receivers:
  filelog:
    include: [ </var/log/mongodb/*.log> ]
    attributes:
      service.name: "prod-mongodb"
exporters:  
  otlphttp:
    endpoint: 'https://otel.kloudmate.com:4318'
    headers:
      Authorization: <xxxxxxxxxxxxxxxxxxx>
      
processors:
  batch:
    send_batch_size: 5000
    timeout: 10s
receivers:
  filelog:
    include: [ </var/log/mongodb/*.log> ]
    attributes:
      service.name: "prod-mongodb"
exporters:  
  otlphttp:
    endpoint: 'https://otel.kloudmate.com:4318'
    headers:
      Authorization: <xxxxxxxxxxxxxxxxxxx>
      
processors:
  batch:
    send_batch_size: 5000
    timeout: 10s
﻿
If the collector is unable to send logs after these configurations then this might be the permission issue for the otelcol-contrib. Edit the otelcol-contrib service at /lib/systemd/system/otelcol-contrib.service and change the user and group to root.
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