DasSimpleExporter/README.md

Das Simple Exporter

Das Simple metrics Exporter for Prometheus

💡 Purpose

Create configurable lightweight application to collect some metrics

📃 Features

• lightweight and system resources friendly
• configurable application
• configurable metrics to be collected
• supported several metric types
• hot reload metrics if configuration changed
• could be used as regular application, as systemctl service or a Docker application
• supports JSON, PROPERTIES and YAML configuration formats

📌 Using

To use specific configuration format the app_config.CONFIG_FILE_NAME variable need to be changed. The default config file format is JSON

Application Configuration

Default config stored in ./configs/ directory in Application dir. To change its location the app_config.CONFIGS_DIR variable need to be changed.

Application config changes to take effect the application need to be restarted.

The Default Application config is:

{
  "monitor": {
    "config": {
      "debug": "false",
      "print_info": "false",
      "interval_seconds": 30,
      "uptime_update_seconds": 60,
      "port": 15200,
      "stop_file_name": "/stop",
      "response_path_separator": "|"
    }
  }
}

• debug and print_info values need for debug purpose and used to output the debugging information into standard output.
• interval_seconds - metrics update time in seconds. Indicates how often every metric will be touch to check if its need to be updated. Every metric have its own update interval.
• uptime_update_seconds - the Application uptime metric update interval in seconds.
• port - port on which the Exporter's service to be started
• stop_file_name - if this file name appears in application's directory the Application will be stopped.
• response_path_separator - the response path separator. Used in rest_value metric configuration.

Metrics Configuration

There are some embedded metrics in the Exporter:

• Exporter uptime
• System uptime
• CPU used percents
• Memory used percents
• Chassis temperature
• CPU temperature

Default config stored in ./configs/config.json file. To change it the app_config.CONFIG_METRICS_FILE_NAME variable need to be changed.

The Default Application config is (no custom metrics are configured):

{
  "monitor": {
    "instance_prefix": "",
    "metrics": {
      "disk": [],
      "health": [],
      "ping": [],
      "iface": [],
      "rest_value": [],
      "shell_value": []
    }
  }
}

instance_prefix - prefix that identifies Instance the Exporter launched on. It used to create the Metric name. May be empty.

The Exporter supports following types of metrics: Common parameters:

• name - parameter used in every metric to identify it. Required.
• interval - time interval in seconds the metric will be updated. Required.

Disk (or mount point) Metrics

Monitors the Mount Point's sizes: total, used, free space in bytes

{
  "name": "root",
  "path": "/",
  "interval": 20
}

• path - FS path to mount point which size will be monitored

Service Health Metrics

Monitors the Service's Health by http request: if 200 code in response - the service is up, otherwise - the service is dn

{
  "name": "google",
  "url": "https://google.com",
  "method": "GET",
  "auth": {
    "user": "",
    "pass": ""
  },
  "headers": {
    "d1": "d1",
    "d2": "d2"
  },
  "interval": 30,
  "timeout": 1
}

• url - URL to be monitored
• methd - method to send request
• auth - authentication section. Optional
  • user - user name
  • pass - user password
• headers - http headers section to be sent to the host. Optional. The header's key-value pairs will be sent as is.
• timeout - timeout to wait for response

ICMP (Ping) Metrics

Monitors the Host Health by ping command: if ip address reachable - the service is up, otherwise - the service is dn

{
  "name": "Router",
  "ip": "192.168.0.1",
  "interval": 30,
  "count": 1
}

• ip - IP Address or DNS name of the host
• count - pings count

Network Interface Metrics

Monitors the Network Interface metrics: send and receive bytes

{
  "name": "Eth0",
  "iface": "eth0",
  "interval": 15
}

• iface - system name of network interface (i.e. eth0, lo0, wlp4s0, etc.)

REST value Metrics

Gets the responses value from http request to REST service

{
  "name": "MyService",
  "url": "http://localhost:8080/api/v1/api",
  "method": "POST",
  "auth": {
    "user": "",
    "pass": ""
  },
  "headers": {
    "d1": "d1",
    "d2": "d2"
  },
  "result_type": "single",
  "result_path": "result",
  "interval": 30,
  "timeout": 2
}

• url - URL to be monitored
• methd - method to send request
• auth - authentication section. Optional
  • user - user name
  • pass - user password
• headers - http headers section to be sent to the host. Optional. The header's key-value pairs will be sent as is.
• result_type - type of result. The single type supported yet.
• result_path - path to result value in response JSON separated by app_config.RESPONSE_PATH_SEPARATOR character. Could be configured in Application config.
• timeout - timeout to wait for response

Shell value Metrics

Gets the shell command executed result value

{
  "name": "shell",
  "command": "echo",
  "args": [3],
  "interval": 5
}

• command - command to be executed
• args - CLI arguments to be provided to the command In example above the metric will return integer value 3.

The metric name creates as follows:

• uses Metric Prefix, actually das_
• uses metric_text given to every metric while it creating
• uses instance_prefix given in metric configuration
• uses name given in metric configuration Note: there are no doubles in metrics names supported by Prometheus. If so the exception occurs ant the application will be stopped.

🚀 Launching the application

Use provided install.sh script to prepare application to use as service. Or use following shell commands to initialize the Python's Virtual env.

python3 -m venv .venv
. ./.venv/bin/activate
pip install -r requirements.txt
deactivate

Regular application

In application directory:

. ./.venv/bin/activate
python ./main.py

System service (preferred option)

Prepare the dasExporter.service file. Then launch commands:

sudo ln -s "$( pwd -P )/dasExporter.service" /etc/systemd/system/dasExporter.service
sudo systemctl daemon-reload
sudo systemctl start dasExporter
sudo systemctl enable dasExporter

• sudo systemctl status dasExporter - to view service status use
• sudo systemctl restart dasExporter - to restart the service use
• sudo systemctl stop dasExporter - to stop the service use

Docker application

Use provided docker-compose.yaml and Dockerfile files to launch Exporter in docker container.

Make sure you provided all mounts you need to be monitored in volume section in the docker-compose.yaml file and made according changes in Disc Metrics Configuration.

Note: In Docker some functions may be unavailable.

Made by -=:dAs:=-