---
title: Debug
description: By default, Heartbeat sends all its output to syslog. When you run Heartbeat in the foreground, you can use the -e command line flag to redirect the output...
url: https://www.elastic.co/elastic/docs-builder/docs/3028/reference/beats/heartbeat/enable-heartbeat-debugging
products:
  - Beats
  - Heartbeat
applies_to:
  - Elastic Cloud Serverless: Generally available
  - Elastic Stack: Generally available
---

# Debug
By default, Heartbeat sends all its output to syslog. When you run Heartbeat in the foreground, you can use the `-e` command line flag to redirect the output to standard error instead. For example:
```sh
heartbeat -e
```

The default configuration file is heartbeat.yml (the location of the file varies by platform). You can use a different configuration file by specifying the `-c` flag. For example:
```sh
heartbeat -e -c myheartbeatconfig.yml
```

You can increase the verbosity of debug messages by enabling one or more debug selectors. For example, to view publisher-related messages, start Heartbeat with the `publisher` selector:
```sh
heartbeat -e -d "publisher"
```

If you want all the debugging output (fair warning, it’s quite a lot), you can use `*`, like this:
```sh
heartbeat -e -d "*"
```