OS4X Core environment variables

Environment variables are created and/or set by all OS4X binaries, which values are based on the configuration of OS4X. These variables are:

• OS4X_CFGFILE: OS4X main configuration file (absolute path information)
• OS4X_IN_DIR: incoming data directory
• OS4X_OUT_DIR: outgoing data directory
• OS4X_TMP_DIR: temporary data directory
• OS4X_BIN_DIR: binary program directory
• OS4X_SCRIPT_DIR: script installation directory
• OS4X_BACKUP_DIR: backup directory
• RAND_FILE: entropy file for OFTP2 needs
• OPENSSL_BIN: absolute path to openSSL binary
• RRDTOOL_BIN: absolute path to RRDtools binary
• RRDB_DATAPATH: RRD data path
• OS4X_WEBGUI_DIR: web interface installation directory
• CA_FILE: configured absolute path to the root certificate file
• CA_PATH: configured absolute path to the root certificate directory

The following environment variables are extracted form the global OS4X configuration file (default: /etc/os4x.conf):

• OS4X_DB_HOST
• OS4X_DB_USER
• OS4X_DB_PWD
• OS4X_DB_NAME
• OS4X_DB_SOCKET
• OS4X_DB_PORT
• OS4X_DB_TYPE: either "mysql", "DB2" or "sqlite3"

Beginning from OS4X build 2019-08-09, the following variable exists:

• OS4X_DB_PREFIX: database table prefix

All processes started by OS4X (event scripts, plugins, etc.) have access to these environment variables. The environment variable "OS4X_CFGFILE" points to the absolute path to the OS4X main configuration file. This has two effects:

• you may start OS4X programs in a shell where this variable is set without using the parameter "-C" for all binaries (because the environment variable points to the correct position of the configfile)
• all subsequent processes started by OS4X (like event scripts) don't have to bother about the given configfile (like plugins of OS4X Enterprise).

Database performance benchmarking

Available in OS4X 3 Core, an environment variable can be set to log all database access timing information into that given file:

OS4X_DB_BENCHMARKLOG

You can set this variable to an absolute filename where OS4X logs all innformation (example: "ksh" or "bash"):

export OS4X_DB_BENCHMARKLOG=/tmp/db2perf.log

This file logs the connect and query time for every single database access, resulting in a fast growing file. The content if this file looks like this (using DB2 database abstraction layer, others like MySQL start with "MySQL"):

DB2 connect: 0.052482 seconds
DB2 SQL query: 0.126631 seconds
DB2 connect: 0.032447 seconds
DB2 SQL query: 0.004983 seconds
DB2 connect: 0.029555 seconds
DB2 SQL query: 0.004500 seconds
DB2 connect: 0.031012 seconds
DB2 SQL query: 0.001324 seconds