Postfix

Plugin: go.d.plugin Module: postfix

Overview

This collector retrieves statistics about the Postfix mail queue using the postqueue command-line tool.

It periodically executes the postqueue -p command. The collection interval is set to 10 seconds by default, but this can be configurable.

This collector is supported on all platforms.

This collector only supports collecting metrics from a single instance of this integration.

Postfix has internal access controls for the mail queue. By default, all users can view the queue. If your system has stricter controls, grant the netdata user access by adding it to authorized_mailq_users in the /etc/postfix/main.cf file. For more details, refer to the authorized_mailq_users setting in the Postfix documentation.

Default Behavior

Auto-Detection

The collector executes postqueue -p to get Postfix queue statistics.

Limits

The default configuration for this integration does not impose any limits on data collection.

Performance Impact

The default configuration for this integration is not expected to impose a significant performance impact on the system.

Metrics

Metrics grouped by scope.

The scope defines the instance that the metric belongs to. An instance is uniquely identified by a set of labels.

Per Postfix instance

These metrics refer to the entire monitored application.

This scope has no labels.

Metrics:

Metric	Dimensions	Unit
postfix.qemails	emails	emails
postfix.qsize	size	KiB

Alerts

There are no alerts configured by default for this integration.

Setup

Prerequisites

No action required.

Configuration

File

The configuration file name for this integration is go.d/postfix.conf.

You can edit the configuration file using the edit-config script from the Netdata config directory.

cd /etc/netdata 2>/dev/null || cd /opt/netdata/etc/netdata
sudo ./edit-config go.d/postfix.conf

Options

The following options can be defined globally: update_every.

Config options

Name	Description	Default	Required
update_every	Data collection frequency.	10	no
binary_path	Path to the postqueue binary. If an absolute path is provided, the collector will use it directly; otherwise, it will search for the binary in directories specified in the PATH environment variable.	/usr/sbin/postqueue	yes
timeout	Timeout for executing the binary, specified in seconds.	2	no

Examples

Custom binary path

The executable is not in the directories specified in the PATH environment variable.

jobs:
  - name: custom_path
    binary_path: /usr/local/sbin/postqueue

Troubleshooting

Debug Mode

To troubleshoot issues with the postfix collector, run the go.d.plugin with the debug option enabled. The output should give you clues as to why the collector isn't working.

• Navigate to the plugins.d directory, usually at /usr/libexec/netdata/plugins.d/. If that's not the case on your system, open netdata.conf and look for the plugins setting under [directories].

  cd /usr/libexec/netdata/plugins.d/

• Switch to the netdata user.

  sudo -u netdata -s

• Run the go.d.plugin to debug the collector:

  ./go.d.plugin -d -m postfix

Getting Logs

If you're encountering problems with the postfix collector, follow these steps to retrieve logs and identify potential issues:

• Run the command specific to your system (systemd, non-systemd, or Docker container).
• Examine the output for any warnings or error messages that might indicate issues. These messages should provide clues about the root cause of the problem.

System with systemd

Use the following command to view logs generated since the last Netdata service restart:

journalctl _SYSTEMD_INVOCATION_ID="$(systemctl show --value --property=InvocationID netdata)" --namespace=netdata --grep postfix

System without systemd

Locate the collector log file, typically at /var/log/netdata/collector.log, and use grep to filter for collector's name:

grep postfix /var/log/netdata/collector.log

Note: This method shows logs from all restarts. Focus on the latest entries for troubleshooting current issues.

Docker Container

If your Netdata runs in a Docker container named "netdata" (replace if different), use this command:

docker logs netdata 2>&1 | grep postfix