How to set up an automated monitoring and alerting system with Prometheus?

To set up the Prometheus automatic monitoring and alert system, follow these steps:

1. Install Prometheus: First, install the Prometheus monitoring system on the target server. Download the latest version of Prometheus from the official website and follow the installation guide to install it.
2. Setting up Prometheus: After installation, it is necessary to configure Prometheus. By editing the prometheus.yml file, you can define the targets, metrics, and alert rules to monitor. You can configure the targets servers and metrics to be monitored by adding the scrape_configs section, and define alert rules by adding the rule_files section.
3. Start Prometheus: After configuring, start the Prometheus server. You can start Prometheus by running the command “prometheus”, and optionally specify the location of the configuration file.
4. Set up alarm rules: In Prometheus, you can define alarm rules to monitor metrics and trigger alerts when thresholds are reached. Alarm rules can be defined in the rule_files section of prometheus.yml. The rules can be defined using the PromQL query language.
5. Installing and configuring Alertmanager: Alertmanager is the alert manager for Prometheus, responsible for receiving alerts sent by Prometheus, processing them, and sending them out. Download the latest version of Alertmanager and follow its installation guide to set it up. After installation, configure Alertmanager’s notification methods, such as email, Slack, etc.
6. To integrate Prometheus with Alertmanager, you need to add the alerting section in Prometheus configuration file and specify the URL of Alertmanager. This way, when Prometheus triggers alert rules, alerts will be sent to Alertmanager.
7. Alarm system testing: After completing the configuration, you can test if the alarm system is functioning properly by manually triggering alarm rules. You can use Prometheus web interface or PromQL queries to query or trigger metrics, and check if Alertmanager successfully receives and sends alarms.
8. Deploy and monitor other targets: In addition to monitoring its own metrics, Prometheus can also be configured to monitor other target servers. Simply add the configuration for other target servers in the scrape_configs section of the prometheus.yml file, and then restart Prometheus to apply the changes.

The above are the basic steps for setting up a Prometheus automatic monitoring alert system, additional configurations and adjustments may be required based on actual needs and situations.