Prerequisites

• Nagios XI is installed and operational on your server.
• The Oracle monitoring plugins (e.g., check_oracle_health) are installed on the Nagios XI server. Refer to the official guide, Installing Oracle Plugins in Nagios XI, for detailed installation steps.
• You have administrative access to both Nagios XI and the Oracle database.

Step 1: Access the Oracle Tablespace Monitoring Wizard

1. Log in to your Nagios XI dashboard.

2. Navigate to Configure > Run a Wizard.

3. Select the Oracle Tablespace wizard from the available options.

Step 2: Enter Oracle Server Details

1. Provide the Fully Qualified Domain Name (FQDN) or IP Address of the Oracle Server.
2. Enter the Port Number (default: 1521).
3. Specify the SID of your Oracle database.
4. Enter the Username and Password for authentication.
5. In the Database field, enter the tablespace name to be monitored.
6. Click Next to proceed.

Step 3: Configure Monitoring Options

1. Define a Host Name for the Oracle server (e.g., oracle-prod-db01) to identify it in Nagios XI.
2. Choose the metrics to monitor. Common options include:
   • Free Space Percentage: Alerts when available space drops below a threshold.
   • Used Space: Tracks storage consumption in MB or GB.
   • Growth Rate: Monitors the rate of data increase over time.
3. Set Warning and Critical thresholds for each metric. For example:
   • Free Space: Warning at 20%, Critical at 10%.
   • Used Space: Warning at 80 GB, Critical at 90 GB.
4. Click Next to proceed.

Step 4: Finalizing Configuration

1. Complete the remaining wizard steps (typically Steps 3-5), reviewing options like check intervals (e.g., every 5 minutes) and notification settings.
2. Click Finish to save the configuration.
3. Nagios XI will create the host and associated service checks, then begin monitoring the specified Tablespace.

Step 5: View Monitoring Results

1. Once the configuration is applied, navigate to Home > Service Detail in the Nagios XI interface.
2. Locate the Oracle Tablespace services under the defined host name.
3. Click a service to view detailed performance data, such as current free space or historical trends.
4. Nagios XI will trigger alerts (e.g., via email or SMS) if thresholds are breached, based on your notification settings

Troubleshooting

If you encounter issues while setting up or running Oracle Tablespace monitoring, consider these common problems and solutions:

• “Connection Failed” Error:
  • Verify the FQDN/IP, port, SID, and credentials are correct. Test connectivity using tnsping from the Nagios XI server.
  • Ensure the Oracle Listener is running on the database server (lsnrctl status).
• No Data Returned:
  • Confirm the Oracle plugin (check_oracle_health) is installed and executable. Run it manually from the command line (e.g., ./check_oracle_health –connect <SID> –username <user> –password <pass> –mode tablespace-free) to debug.
  • Check that the specified Tablespace name exists in the database (query: SELECT TABLESPACE_NAME FROM DBA_TABLESPACES).
• Alerts Not Triggering:
  • Review the Warning and Critical thresholds in the service configuration to ensure they align with current Tablespace usage.
  • Verify notification settings under Configure > Notifications in Nagios XI.
• Performance Issues:
  • Reduce the check interval (e.g., from 1 minute to 5 minutes) if the server is overloaded by frequent checks.

For persistent issues, consult the Nagios XI logs (located at /usr/local/nagiosxi/var/nagios.log) or contact Nagios Support.

Conclusion

Setting up Oracle Tablespace monitoring in Nagios XI empowers DBAs to proactively manage database storage and prevent disruptions. By following this guide, you can configure real-time monitoring, define meaningful thresholds, and leverage Nagios XI’s alerting system to stay ahead of potential issues. With the added troubleshooting steps, you’re equipped to resolve common challenges and ensure a robust monitoring setup.

Prerequisites

Before setting up monitoring, ensure the following requirements are met:

• PostgreSQL Authentication: A valid PostgreSQL user with appropriate permissions is required.
• Firewall Rules: Ensure PostgreSQL allows inbound connections from Nagios XI.
• Network Configuration: The PostgreSQL server should be accessible over the network.
• Nagios XI Installation: Ensure Nagios XI is installed and operational with appropriate plugins (e.g., check_postgres).

Note: Test connectivity (e.g., using psql or telnet) between the Nagios XI server and PostgreSQL to preempt setup issues.

Key Features of Nagios XI for PostgreSQL Monitoring

Nagios XI provides robust tools to monitor PostgreSQL effectively:

• Comprehensive Database Monitoring: Tracks critical metrics such as connection status, database size, table and relation sizes, and more.
• Custom Query Monitoring: Allows execution of user-defined SQL queries to monitor bespoke metrics, with customizable alerts based on results.
• Third-Party Plugin Integration: Supports plugins like check_postgres for advanced checks, including database bloat, replication lag, and lock contention.

Benefits of Monitoring PostgreSQL with Nagios XI

• Proactive Issue Detection: Identify and resolve potential issues—such as resource exhaustion or slow queries—before they cause downtime.
• Enhanced Performance Visibility: Gain real-time insights into PostgreSQL performance metrics to optimize operations.
• Customizable Alerting: Define thresholds for warnings and critical alerts tailored to your organization’s needs.

Running the PostgreSQL Server Configuration Wizard in Nagios XI

The PostgreSQL Server Configuration Wizard in Nagios XI streamlines the monitoring setup process. Follow these steps:

Step 1: Access the Wizard

1. Navigate to Configure > Configuration Wizards in Nagios XI.

2. Search for Postgres Server and select the wizard.

3. Enter the PostgreSQL connection details:

• Address: The IP address or hostname of the PostgreSQL server (e.g., 192.168.23.76).
• Port: PostgreSQL default port is 5432 (modify if necessary).
• Username: The PostgreSQL user with monitoring privileges (e.g., postgres).
• Password: Enter and confirm the password.
• Database: Specify the database to monitor (e.g., postgres).

4. Click Next to proceed.

Step 2: Define Monitoring Parameters

1. Verify or adjust the Host Name field to accurately reflect the PostgreSQL server’s identity.
2. Select the metrics to monitor, such as:
   • Database availability
   • Active connections
   • Query performance (e.g., slow query counts)
   • Transaction log status
3. Set Warning and Critical thresholds for each metric to trigger alerts as needed.
4. Click Next.

Step 3-5: Finalizing the Setup

1. Review all settings for accuracy.
2. Make adjustments if necessary (e.g., tweak thresholds or add custom queries).
3. Click Finish to apply the configuration.
4. Once completed, select View Status Details to confirm that the new monitoring services are active and reporting correctly

Troubleshooting Common Issues

If problems arise during setup or monitoring, consider these checks:

• Connection Failures: Verify PostgreSQL’s pg_hba.conf file allows connections from the Nagios XI server (e.g., add host all all <Nagios_IP> md5).
• Firewall Blocking: Temporarily disable the firewall to test connectivity, then adjust rules to permit traffic on the PostgreSQL port (default: 5432).
• Authentication Errors: Confirm the username and password match an active PostgreSQL role with appropriate permissions.
• Network Issues: Ensure PostgreSQL is running and listening on the specified address and port (check with netstat -tuln | grep 5432).

Tip: Enable verbose logging in Nagios XI to diagnose issues more effectively.

Conclusion

Nagios XI simplifies PostgreSQL monitoring, delivering actionable insights into database health and performance. By leveraging its configuration wizard and extensible plugin ecosystem, IT teams can ensure their PostgreSQL environments remain reliable and efficient. For further support, visit the Nagios Support Forum or the Nagios Knowledgebase.

Prerequisites

Before diving into the configuration, ensure the following are in place:

• SQL Server Authentication: Create a dedicated monitoring user account in MSSQL with appropriate permissions.
• Firewall Rules: Configure the Windows firewall to allow inbound traffic on MSSQL ports.
• Instance and Port Configuration: For named instances, verify that the SQL Server Browser service is running and accessible.

Setting Up the Monitoring User Account

A dedicated user account is needed for monitoring MSSQL:

1. Open SQL Server Management Studio (SSMS) and connect with administrative rights.
2. Navigate to Security > Logins and right-click New Login.
3. Choose the authentication method:
   • Windows Authentication: Use an existing Windows account.
   • SQL Authentication: Create a new SQL user with a strong password.
4. Grant the necessary permissions by executing this SQL query:

GRANT VIEW SERVER STATE TO [username];

GRANT VIEW SERVER STATE TO [username];

5. Assign the user to the specific databases you intend to monitor (e.g., via the User Mapping tab in SSMS).

Configuring Firewall Rules

If the Windows firewall is enabled, configure the following:

1. Open Windows Firewall with Advanced Security.
2. Create a new Inbound Rule:
   • Port Type: TCP
   • Port Number: 1433 (default) or your custom MSSQL port
3. For named instances, add a second rule:
   • Port Type: UDP
   • Port Number: 1434 (for SQL Server Browser)
4. Apply the rules and restart the SQL Server service if changes were made to port settings.

Running the MSSQL Configuration Wizard in Nagios XI

Nagios XI streamlines MSSQL monitoring with its intuitive configuration wizards. Follow these steps:

Step 1: Launch the Wizard

1. Navigate to Configure > Configuration Wizards in Nagios XI.

2. Search for and select the MSSQL Server wizard (or related options like MSSQL Database or MSSQL Query, depending on your needs).

3. Enter the following details:

• Address: IP address or hostname of the MSSQL server.
• Host Name: A descriptive name for the server in Nagios (e.g., “MSSQL-Prod”).
• Username: The monitoring user created earlier.
• Password: The user’s password (confirm it matches).
• Database Server Instance: Enter the instance name (e.g., “SQLEXPRESS”) if applicable.
• Port: Specify the port (default: 1433) if using a static configuration.
• MSSQL Version: Select the appropriate version (e.g., 2019, 2022).
• TDS Version: Leave as “Auto” unless specific compatibility is required.

4. Click Next to continue.

Step 2: Define Monitoring Parameters

1. Ensure the Host Name field correctly identifies your MSSQL server.
2. Select the metrics to monitor:
   • CPU and memory usage
   • Active connections
   • Database availability
   • Query performance
3. Set Warning and Critical thresholds for alerts.
4. Click Next to proceed.

Step 3-5: Finalizing the Setup

1. Review your settings and apply any necessary changes.
2. Click Finish to complete the wizard.
3. After configuration, click View status details to check the newly created services.

Troubleshooting

If issues arise, consider the following steps:

• Authentication Issues: Ensure the correct credentials are being used.
• Firewall Blocks: Temporarily disable the firewall to confirm connectivity.
• SQL Server Browser: Ensure it is running if connecting using an instance name.
• Network Configuration: Check if the MSSQL server allows remote connections.

Conclusion

Nagios XI makes MSSQL monitoring straightforward and effective, delivering actionable insights into performance and availability. For additional assistance, consult the Nagios Support Forum or the Nagios Knowledgebase. Properly configured, this setup ensures your MSSQL environment remains reliable and optimized.

Prerequisites

Before starting, ensure your environment meets these requirements:

• MongoDB Authentication Enabled: Authentication must be enabled on your MongoDB server. Refer to Enable Authentication.
• User with clusterAdmin Role: A user with the clusterAdmin role in the admin database is required to retrieve server statistics. Refer to Manage Users and Roles.
• Remote Access Configuration: Ensure MongoDB is configured to accept remote connections (bindIp must be set appropriately). Refer to Configuration Options.
• Firewall Rules: Configure firewall settings to allow Nagios XI to communicate with MongoDB:
  • Linux: Configure iptables
  • Windows: Configure netsh

Verify connectivity from the Nagios XI server:

telnet <mongo-ip> 27017

telnet <mongo-ip> 27017

Configuring MongoDB Monitoring in Nagios XI

Follow these steps to set up MongoDB monitoring using the Nagios XI MongoDB Server Configuration Wizard.

Step 1: Access the Wizard

1. Log in to Nagios XI.
2. Navigate to Configure > Configuration Wizards.
3. Search for MongoDB Server and select it.

Step 2: Enter Server Details

1. Enter the IP address or hostname of your MongoDB server.
2. Specify the port (default: 27017) if customized.
3. Provide the Username and Password of a user with clusterAdmin privileges.
4. Click Next.

Step 3: Configure Monitoring Parameters

1. Confirm the Host Name field matches your MongoDB server.
2. Select the metrics to monitor:
   • Queries per second
   • Memory usage
   • Number of databases
   • Free connection percentage
3. Set warning and critical thresholds (e.g., 80% and 90% for connections).
4. If using replication, enable:
   • Replication status
   • Replication lag (seconds)
   • Replication lag percentage
5. Click Next.

Step 4: Apply and Verify Configuration

1. Review your selections.
2. Click Finish to apply the configuration.
3. Navigate to Host and Service Details in Nagios XI to verify the new host and service checks.

Troubleshooting

If monitoring fails, check for these common issues:

• Authentication Errors: Ensure correct credentials by testing in the MongoDB shell:

mongo -u <username> -p <password> --authenticationDatabase admin

mongo -u <username> -p <password> --authenticationDatabase admin

• Connection Issues: Verify bindIp settings and test connectivity:

nc -zv <mongo-ip> 27017

nc -zv <mongo-ip> 27017

• Firewall Blocks: Confirm open ports:

iptables -L | grep 27017 # Linux 
netsh advfirewall show allprofiles # Windows

iptables -L | grep 27017 # Linux 
netsh advfirewall show allprofiles # Windows

• Log Errors: Check MongoDB logs for potential issues:

tail -f /var/log/mongodb/mongod.log

tail -f /var/log/mongodb/mongod.log

Conclusion

Using the MongoDB Server Configuration Wizard, Nagios XI simplifies monitoring key MongoDB metrics, ensuring database stability and performance. For additional support, visit the Nagios Support Forum or the Nagios Knowledgebase.

Prerequisites

Before setting up MySQL monitoring in Nagios XI, ensure the following requirements are met:

• A running Nagios XI instance
• A running MySQL server (local or remote).
• MySQL credentials with sufficient privileges for monitoring (e.g., SELECT, SHOW DATABASES, PROCESS).
• Unrestricted network connectivity between the Nagios XI server and the MySQL server (port 3306 by default).

Verify your MySQL version by running:

mysql --version

mysql --version

Example output:

MySQL 8.0.34-0ubuntu0.20.04.1

MySQL 8.0.34-0ubuntu0.20.04.1

Step 1: Access the MySQL Monitoring Wizard

1. Log in to the Nagios XI web interface.
2. Navigate to Configure > Configuration Wizards.
3. Search for and select the MySQL Server wizard.

Step 2: Configure MySQL Monitoring

1. Enter the required details:
   • Monitor Name: A descriptive name for the MySQL check.
   • Address: IP address or hostname of the MySQL server.
   • Port: MySQL server port (default: 3306).
   • Username: MySQL user with monitoring privileges.
   • Password: Password for the MySQL user.
2. Click Next to proceed.

Step 3: Select Metrics to Monitor

Choose the MySQL performance metrics you want to track, such as:

• Connection Status: Checks if MySQL is responding.
• Uptime: Displays how long MySQL has been running.
• Slow Queries: Monitors queries exceeding the slow query threshold.
• Query Cache Usage: Evaluates query cache efficiency.
• Buffer Pool Usage: Tracks InnoDB buffer pool utilization.
• Table Locks: Detects locking issues.
• Replication Status: Monitors MySQL replication health.

Set warning and critical thresholds for each metric based on your environment.

Step 4: Finalize Configuration

1. Review all settings.
2. Click Finish to apply the configuration.
3. Nagios XI will now begin monitoring the specified MySQL server metrics.

Video Tutorial: Monitoring MySQL with Nagios XI

For a visual guide to the setup process, watch this step-by-step tutorial:

This video demonstrates the configuration steps outlined above, offering additional clarity for visual learners.

Step 5: Advanced Monitoring with Plugins (Optional)

For more granular monitoring, you can use check_mysql_health, which provides insights into:

• Index usage
• Buffer pool hit rate
• Temporary tables on disk
• Table cache hit rate
• Connected threads

Installing the Plugin

cd /usr/local/nagios/libexec
wget https://exchange.nagios.org/check_mysql_health.tar.gz
tar -xzf check_mysql_health.tar.gz
cd check_mysql_health
./configure
make
make install

cd /usr/local/nagios/libexec
wget https://exchange.nagios.org/check_mysql_health.tar.gz
tar -xzf check_mysql_health.tar.gz
cd check_mysql_health
./configure
make
make install

Configuring the Plugin

1. In Nagios XI, navigate to Configure > Core Config Manager.
2. Define a new command (e.g., check_mysql_health) with appropriate arguments (e.g., -H $HOSTADDRESS$ -u $ARG1$ -p $ARG2$ –mode $ARG3$).
3. Add a service check for the MySQL host, linking it to the new command.
4. Set thresholds (e.g., –warning 80 –critical 90 for buffer pool hit rate) and enable notifications.

Step 6: Validate the Monitoring Setup

Confirm that Nagios XI is actively monitoring MySQL:

1. Go to Views > Service Status in the Nagios XI interface.
2. Search for the MySQL-related services and review their status (e.g., “OK,” “Warning,” or “Critical”).
3. Investigate and resolve any unexpected alerts by checking logs or connectivity.

Example Output:

Service: MySQL Connection Status - Status: OK - Response Time: 0.12s
Service: MySQL Slow Queries - Status: OK - Slow Queries: 2/min

Service: MySQL Connection Status - Status: OK - Response Time: 0.12s
Service: MySQL Slow Queries - Status: OK - Slow Queries: 2/min

Conclusion

By following this guide, you have successfully set up MySQL monitoring in Nagios XI. If you encounter any issues, refer to the Nagios Support Forum or the Nagios Knowledge Base for troubleshooting assistance.

Nagios XI 2024 & 2026

Repairing the Nagios XI 2026 Database

Nagios XI 5.x (Legacy)

Repairing the Nagios XI 5 Database

Optimizing the Nagios XI Database – 2024 & 2026

Optimizing the XI 2026 Database

Optimizing the Nagios XI Database – v5 (Legacy)

Optimizing the XI 5 Database

Nagios XI 2024 & 2026

Exporting the XI 2026 Configuration Database

Nagios XI 5 (Legacy)

Exporting the XI 5 Configuration Database