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ThePrez / prometheus-exporter-jdbc

Prometheus Client for IBM i
GNU General Public License v3.0
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grafana ibmi jdbc monitoring prometheus prometheus-exporter sql

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JDBC Prometheus Exporter

Prometheus exporter for IBM i and other databases. This provides an interface for passive metrics collection. That is, Prometheus can scrape this exporter for metrics.

Any JDBC driver may be used as a data source for Prometheus. The metrics are customizable. Any numeric metric available through SQL can be monitored using this client!

This exporter was built for and tested on IBM i as a way to monitor IBM i system and application status through SQL. As such, its out-of-box-experience is centered around the IBM i use case.

Installation and Startup

  1. Download the latest prom-client-ibmi.jar file from the releases page. Place this file the filesystem somewhere.
  2. From a command line, cd to the directory where you placed prom-client-ibmi.jar and run: 
    java -jar prom-client-ibmi.jar

    Create a default configuration file by responding y to the following prompt:

    Configuration file config.json not found. Would you like to initialize one with defaults? [y]

    You Should see a series of messages about collectors being registered. If you see the following message, the client is running successfully:

    ==============================================================
Successfully started Prometheus client on port 9853
==============================================================

If you're not running on IBM i, you'll want to kill the program and modify config.json to have reasonable values for your needs.

Known breaking changes

In version 1.0

Using another JDBC driver

The IBM i JDBC driver is bundled with this exporter. If you'd like to use a different JDBC driver, you will need to specify the necessary options in the configuration (namely, driver_class and driver_uri). You will also need to explicitly add that driver to the class path. For instance:

java -cp prom-client-ibmi.jar:myjdbcdriver.jar com.ibm.jesseg.prometheus.MainApp

Using the nohup utility

If you would like to run the program in the background so that you can exit your shell and keep the Prometheus client running, you can use the nohup utility:

nohup java -jar prom-client-ibmi.jar > prom-client.log 2>&1

Running on a different port

The Prometheus client port can be customized in several ways. The port is determined by the following, in order of precedence:

Prometheus Configuration

To configure Prometheus, just add a target to the scrape_configs as done in the following sample configuration:

scrape_configs:
  - job_name: 'prometheus-jdbc'
    metrics_path: '/metrics'
    static_configs:
      - targets: ['1.2.3.4:9853']

JSON Configuration

See config.json for an example JSON file, which contains the following:

{
  "port": 9853,

  "queries": [{
      "name": "System Statistics",
      "interval": 60,
      "enabled": true,
      "prefix": "STATS",
      "sql": "SELECT * FROM TABLE(QSYS2.SYSTEM_STATUS(RESET_STATISTICS=>'YES',DETAILED_INFO=>'ALL')) X"
    },
    {
      "name": "System Activity",
      "interval": 20,
      "prefix": "SYSACT",
      "enabled": true,
      "sql": "SELECT * FROM TABLE(QSYS2.SYSTEM_ACTIVITY_INFO())"
    },
    {
      "name": "number of remote connections",
      "interval": 30,
      "enabled": true,
      "sql": "select COUNT(REMOTE_ADDRESS) as REMOTE_CONNECTIONS from qsys2.netstat_info where TCP_STATE = 'ESTABLISHED' AND REMOTE_ADDRESS != '::1' AND REMOTE_ADDRESS != '127.0.0.1'"
    },
    {
      "name": "Memory Pool Info",
      "interval": 100,
      "enabled": true,
      "multi_row": true,
      "prefix": "MEMPOOL",
      "sql": "SELECT POOL_NAME,CURRENT_SIZE,DEFINED_SIZE,MAXIMUM_ACTIVE_THREADS,CURRENT_THREADS,RESERVED_SIZE FROM TABLE(QSYS2.MEMORY_POOL(RESET_STATISTICS=>'YES')) X"
    },
    {
      "name": "Plan Cache Analysis",
      "interval": 45,
      "multi_row": true,
      "enabled": true,
      "prefix": "PLAN_CACHE",
      "sql": "CALL QSYS2.ANALYZE_PLAN_CACHE('03', '', '', BX'', '%'); select replace(upper(HEADING), ' ', '_') as HEADING, bigint(trim(TRANSLATE(VALUE ,  ' ', 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz(+-*/%=_&\"''()<>,.:;?) ' ))) as val from QTEMP.QDBOP00003"
    },
    {
      "name": "Named Temp Storage bucjets",
      "interval": 90,
      "multi_row": true,
      "enabled": true,
      "prefix": "TMP_STG_BUCKETS",
      "sql": "select replace(upper(REPLACE(GLOBAL_BUCKET_NAME, '*','')), ' ', '_') as NAME, BUCKET_CURRENT_SIZE as CURRENT_SIZE, BUCKET_PEAK_SIZE as PEAK_SIZE from QSYS2.SystmpSTG where GLOBAL_BUCKET_NAME IS NOT NULL"
    },
    {
      "name": "Unnamed Temp Storage buckets",
      "interval": 90,
      "multi_row": false,
      "enabled": true,
      "prefix": "UNNAMED_TMP_STG_BUCKETS",
      "sql": "select SUM(BUCKET_CURRENT_SIZE) as CURRENT_SIZE, sum(BUCKET_PEAK_SIZE) as PEAK_SIZE from QSYS2.SystmpSTG where GLOBAL_BUCKET_NAME IS NULL"
    },
    {
      "name": "HTTP Server metrics",
      "interval": 60,
      "multi_row": true,
      "enabled": true,
      "prefix": "HTTP",
      "sql": "select SERVER_NAME concat '_' concat replace(HTTP_FUNCTION, ' ','_') as SERVER_FUNC, SERVER_NORMAL_CONNECTIONS, SERVER_SSL_CONNECTIONS, SERVER_ACTIVE_THREADS, SERVER_IDLE_THREADS, SERVER_TOTAL_REQUESTS, SERVER_TOTAL_REQUESTS_REJECTED, SERVER_TOTAL_RESPONSES, REQUESTS, RESPONSES, NONCACHE_RESPONSES, BYTES_RECEIVED, BYTES_SENT, NONCACHE_PROCESSING_TIME, CACHE_PROCESSING_TIME from qsys2.HTTP_SERVER_INFO      "
    },
    {
      "name": "System Values",
      "interval": 333,
      "multi_row": true,
      "prefix": "SYSVAL",
      "sql": "select SYSTEM_VALUE_NAME,CURRENT_NUMERIC_VALUE from QSYS2.SYSTEM_VALUE_INFO where CURRENT_NUMERIC_VALUE IS NOT NULL"
    }
  ]
}

Notes about the JSON configuration file:

Valid values for JSON configuration

Key name Type required? Description
queries array yes Array of elemnts specifying which SQL queries to run
driver_class String no The JDBC driver class (default: "com.ibm.as400.access.AS400JDBCDriver")
driver_uri String no The JDBC connection string (default: "jdbc:as400://localhost")
hostname String no The hostname of the system to connect to (default: localhost)
username String no Username to be used for the connection
password String no Password for the connection. NOT SECURE

NOTE: You may be prompted for any needed values (for instance, a password) at the command line if not specified in the JSON configuration

queries element

The queries element contains an array. Each element in the array can have the following values: Key name Type required? Description
sql String yes The SQL query
name String no A human-readable name for the query
interval Integer no The interval to wait between queries (default: infinity)
prefix String no A prefix to be used in the Prometheus gauge name
include_hostname boolean no Whether to include the hostname in the Prometheus gauge name (default: true)
enabled boolean no Whether this SQL query is enabled (default: true)
multi_row boolean no Whether to enable multi-row mode (default: false)

IMPORTANT NOTES ABOUT COLLECTED METRICS

Collection data modes

Single-row mode

The default behavior for processing query output is single-row mode. If feasible, this is the recommended way to collect metrics. In single-row mode, only the first row of results are processed, but the gauge names can be computed up front, since the identifier for the gauge is simply the column name.

Multi-row mode

Multi-row mode allows you to collect metrics from multiple rows of a JDBC query. When using multi-row mode, the value of the first column in each result is used to formulate a gauge name each time the query is run. This has negative implications if the result set data does not have a consistent value in the first column.

Collection timing modes

Interval-based

The interval value for a query in the JSON configuration indicates how long to pause between queries. When using this technique, responses to Prometheus will be based on the most recent value collected. This could mean the same collection value is repeated in Prometheus, or that values may be lost. For instance, if using a 60-second query interval:

For efficiency's sake, this is the default behavior. This allows for aggressive Prometheus scrape intervals without putting excessive load on the monitored system.

Point-in-time

If omitted, the interval value for a query in the JSON configuration defaults to infinity. Metrics can be gathered upon-request by way of the /metrics_now endpoint. This approach provides the most up-to-date information to Prometheus, at intervals defined by Prometheus. However, use this approach with caution. It exposes the monitored system to excessive load if metrics are scraped often. When using this approach, the exporter still limits the query frequency to 5-second intervals.

Managing with Service Commander (IBM i only)

First, install Service Commander (package name service-commander) version 1.5.1 or later.

Then, from a command line, cd to the directory where you placed prom-client-ibmi.jar and run:

java -jar prom-client-ibmi.jar sc

Follow the on-screen instructions. A prometheus.yml file will be created. Do not delete this file.

The default configuration adds a prometheus to the autostart group to be launched automatically at IPL.

Installation and Startup (off IBM i)

This Prometheus client can be run on a different platform and connect remotely to IBM i to gather statistics. Currently, however, only one remote system at a time is supported.

To enable this, populate username, hostname, and (optionally) password in the config.json file that is generated upon initial startup.

For instance:

  "username": "myuser",
  "hostname": "systemname",
  "password": "mypassword"

Note, however, that putting your password in a plaintext file is not recommended. Instead, configure the username and hostname. You will be prompted for the password at runtime.

For instance:

  "username": "myuser",
  "hostname": "systemname"

(documentation forthcoming)

Metrics gathered with default config (IBM i)

Sample screenshot (visualization w/Grafana)

image