prometheus exited with code 2

Prometheus is an open-source monitoring system that collects metrics from different targets and stores them in a time-series database. The error message "Prometheus exited with code 2" indicates that Prometheus failed to start or encountered an error while running.

There are several reasons why Prometheus may fail to start or exit with code 2:

1. Configuration errors: Check your Prometheus configuration file for syntax errors or incorrect configurations. Make sure that the targets you are trying to scrape are correctly defined and accessible.

2. Port conflicts: Ensure that the port specified in your Prometheus configuration file is not already in use by another application.

3. Insufficient permissions: Check that the user running Prometheus has the necessary permissions to access the directories and files required for operation.

4. Out of memory: If Prometheus is running out of memory, you can try increasing the memory limit by setting the `--storage.tsdb.max-block-duration` flag to a higher value.

You can check the Prometheus logs for more information on the specific error that caused the exit code 2. The logs can usually be found in the `/var/log` directory on Linux systems.