Default Environment Variables

Environment variables store frequently used runtime values and help make applications more portable, flexible, and easier to configure.

Variables can be used to adjust values referenced throughout application code or to control predefined software-stack behaviour. Most platform-certified stacks include default variables for common hosting and runtime settings.

On this page

Default Variables List
Editable and Read-Only Variables
Common Variables
What’s next?

Default Environment Variables List

Variable Name	Editable	Stacks	Description
`{SOFTWARE}_VERSION`	–	All	Version of the specified stack, engine, template, module, or other software component.
`ADMIN_USER`	–	GlassFish/Payara, WildFly, Couchbase, LiteSpeed Web Server, LiteSpeed ADC, LLSMP	Administrator login for the management console.
`ADMINPANEL_ENABLED (PHPMYADMIN_ENABLED)`	+	Databases, LLSMP, LEMP	Enables the admin panel with true or 1; other values disable it. Restart required. The value in brackets is deprecated.
`APP_FILE`	+	Node.js	Main Node.js application file to launch.
`APP_MODULE`	+	Python Engine	Application entry point in module:attribute format; _AUTO_ enables autodetection.
`APP_NAME`	+	.NET Core	Target application folder or specific .dll file.
`ASPNETCORE_URLS`	+	.NET Core	Configures the URL used by .NET Core services.
`AUTO_OLD_HEAP`	+	Node.js	Enables or disables memory auto-configuration for the maximum old heap size.
`CACHE_ENABLED`	+	LLSMP, LEMP	Enables or disables the built-in Memcached service. Restart required.
`CACHE_MEM_LIMIT`	+	LLSMP, LEMP	RAM share reserved for Memcached; 10% by default.
`CLONE_ON_SCALE`	+	All	Controls whether horizontally added nodes clone the master or are created from scratch.
`CP_MEM_LIMIT`	+	LLSMP, LEMP	RAM share reserved for the application server; 50% by default.
`DAS`	–	GlassFish/Payara	Indicates whether the layer contains a DAS node.
`DB_MEM_LIMIT`	+	LLSMP, LEMP	RAM share reserved for MariaDB; 40% by default.
`DEFAULT_CLUSTER`	+	LiteSpeed ADC	Selects HTTP, AJP, FCGI, or LSAPI proxying; can be disabled.
`DOCKER_EXPOSED_PORT`	–	All	Lists ports from the image EXPOSE instruction opened by the container firewall.
`FULL_GC_AGENT_DEBUG`	+	Java	Enables or disables Java GC process debug logging.
`FULL_GC_PERIOD`	+	Java	Interval between full GC calls; 900 seconds by default.
`G1PERIODIC_GC_INTERVAL`	+ for OpenJDK 12/13	Java	G1 periodic collection interval in milliseconds; 0 disables it.
`G1PERIODIC_GC_SYS_LOAD_THRESHOLD`	+ for OpenJDK 12/13	Java	Allows G1 periodic collection below the configured one-minute system load.
`GC_SYS_LOAD_THRESHOLD_RATE`	+ for OpenJDK 12/13	Java	Multiplier for G1PeriodicGCSystemLoadThreshold; 0.3 by default.
`GEM_HOME`	+	Ruby	Locations where gems can be found; should include GEM_PATH.
`GEM_PATH`	–	Ruby	Default gem installation path.
`GMS_LISTENER_PORT`	–	GlassFish/Payara	Group Management Service listener port.
`GO_BUILD_OPTIONS`	+	Go	Flags and options used to build the Go application.
`GO_RUN`	+	Go	Executable binary name; deployment tries to detect it when omitted.
`GO_RUN_OPTIONS`	+	Go	Flags and options used to run the Go application.
`GOPATH`	–	Go	Go application deployment folder.
`HAZELCAST_CONFIG`	+	GlassFish/Payara	Path to the Hazelcast configuration file.
`HOME_DIR`	–	GlassFish/Payara, WildFly, Spring Boot, Java Engine, Node.js, Shared Storage, Python Engine	Container home directory.
`HOT_DEPLOY`	+	Tomcat, TomEE	Enables or disables deployment without application-server restart.
`IRBRC`	–	Ruby	Path to the IRB configuration file.
`JAVA_ARGS`	+	Java	Custom arguments passed to the application main function.
`JAVA_HOME`	–	Java, Maven	Java runtime installation directory.
`JAVA_OPTS_CONFFILE`	–	Java, Maven	Path to variables.conf.
`JBOSS_HOME`	–	WildFly	WildFly home directory.
`JELASTIC_AUTOCONFIG`	+	LiteSpeed Web Server, LLSMP, LiteSpeed ADC, MySQL, MariaDB, Percona	Enables or disables smart auto-configuration based on RAM and CPU.
`JELASTIC_EXPOSE`	+	All	Controls automatic redirection and can define a specific port.
`JELASTIC_MEMORY_AUTOCONFIG`	+	WildFly	Enables or disables WildFly memory auto-configuration.
`JELASTIC_PRIORITY_PORTS`	+	GlassFish/Payara	Sets the GlassFish HTTP listener port.
`LAUNCH_JBOSS_IN_BACKGROUND`	+	WildFly	Controls background startup of the application server.
`LSWS_MAX_CHILDREN`	+	LLSMP, LiteSpeed Web Server	Overrides the maximum child-process limit.
`MASTER_HOST`	–	All	Short hostname of the layer master node.
`MASTER_ID`	–	All	Unique identifier of the layer master node.
`MASTER_IP`	–	All	Internal IP address of the layer master node.
`MAVEN_DEPLOY_ARTIFACT`	+	Maven	Artifact selected for deployment.
`MAVEN_OPTS`	+	Maven	JVM options used to start Maven.
`MAVEN_RUN_ARGS`	+	Maven	Custom arguments for the application build.
`MAX_OOM_REDUCE_CYCLES`	+	MySQL, MariaDB, Percona	Maximum buffer-pool reduction cycles after OOM restarts; 5 by default.
`MY_RUBY_HOME`	–	Ruby	Ruby engine directory.
`NODE_ENV`	–	Node.js	Application environment such as development, staging, production, or testing.
`NODE_OPTIONS`	+	Node.js	Node.js runtime V8 options.
`NVM_DIR`	–	Node.js	NVM installation path.
`ON_ENV_INSTALL`	+ before creation	All	Script or URL executed after environment creation.
`OOM_ADJUSTMENT`	+	MySQL, MariaDB, Percona	Buffer-pool reduction after each OOM restart; 10% by default.
`OOM_DETECTION_DELTA`	+	MySQL, MariaDB, Percona	Log-analysis interval after restart; 2 seconds by default.
`OPEN_INBOUND_PORTS (JELASTIC_PORTS)`	+ before creation	All	Custom firewall ports opened during container creation.
`PACKAGE_MANAGER`	+	Node.js	Package manager used to install dependencies, such as npm or yarn.
`PACKAGE_MANAGER_OPTS`	+	Node.js	Additional package-manager options.
`PATH`	–	All	Default shell search path for executable programs.
`PHP_MAX_EXECUTION_TIME`	+	PHP	Maximum script execution time; 300 seconds by default.
`PHP_MEMORY_LIMIT`	+	PHP	Maximum memory per script; 25% by default, -1 for unlimited.
`PHPFPM_MAX_CHILDREN`	+	NGINX PHP	PHP-FPM child worker count; normally based on available CPU cores.
`PORT`	+	Python	Bind port; redirects TCP 80 or 443 to the selected port.
`PORT_4848_TCP_PORT`	–	GlassFish/Payara	Administration console port.
`PROCESS_MANAGER`	+	Node.js, Python Engine	Selects the process manager, such as npm, pm2, forever, uvicorn, or gunicorn.
`PROCESS_MANAGER_FILE`	–	Node.js	File containing process-manager startup options.
`PROXY_READ_TIMEOUT`	+	NGINX balancer, NGINX PHP	Backend read timeout in seconds.
`PSWD_FILE`	–	GlassFish/Payara	File containing the administrator password.
`REDIRECT_EXCLUDE_PORTS`	+	Node.js	Ports excluded from automatic redirection.
`REDIS_COMMANDER`	+	Redis	Enables or disables Redis Commander.
`REDIS_ENABLED`	+	PHP	Deprecated; use CACHE_ENABLED. Controls Redis object caching.
`REDIS_SENTINEL`	+	Redis	Enables or disables Redis Sentinel.
`ROOT_DIR`	–	Node.js, Python Engine	Application deployment directory.
`RUN_OPTION`	+	.NET Core	Additional dotnet run options.
`SERVER_WEBROOT`	–	LLSMP, LiteSpeed Web Server	Application deployment directory.
`STACK_NAME`	–	All	Current stack name.
`STACK_PATH`	–	All	Stack home directory.
`STACK_USER`	–	All	Default stack user.
`STANDALONE_MODE_CONFIG`	+	WildFly	Configuration file for standalone WildFly.
`TCP_BALANCING`	+	HAProxy	Enables or disables proxying to TCP backends.
`UPDATE_PACKAGES_ON_RESTART`	+	Node.js	Controls automatic package installation after service restart.
`UPSTREAM_KEEPALIVE`	+	NGINX balancer	Value for the NGINX upstream keepalive directive.
`VERT_SCALING`	+	Java	Enables or disables the default Java GC agent.
`WAF`	+	LLSMP, LiteSpeed Web Server	Enables or disables the LiteSpeed Web Application Firewall.
`WEB_ROOT`	–	Go	Deployed application path.
`WEBROOT`	–	PHP, Tomcat/TomEE, GlassFish/Payara, Python Engine	Application deployment directory.
`WORKER_PROCESSES`	+	NGINX balancer	NGINX worker-process count or autodetection mode.
`WORKERS`	+	Python Engine	Number of worker processes; nproc uses the CPU count.
`WP_PROTECT`	+	LLSMP, LiteSpeed Web Server, LiteSpeed ADC	WordPress brute-force protection action.
`WP_PROTECT_LIMIT`	+	LLSMP, LiteSpeed Web Server, LiteSpeed ADC	WordPress brute-force protection limit; 10 by default.

Editable and Read-Only Variables

“+” variables: These values can be adjusted to customise the container. A service or container restart is generally required to apply the change.

“-” variables: These are informational or platform-managed values. Changing them usually does not apply a real container change and can break internal platform logic.

Common Variables for Managed Stacks

{SOFTWARE}_VERSION — current software version.
CLONE_ON_SCALE — controls whether scaled nodes clone the master.
DOCKER_EXPOSED_PORT — lists image ports opened by the firewall.
JELASTIC_EXPOSE — manages automatic redirection and port selection.
MASTER_HOST, MASTER_ID, and MASTER_IP — identify the layer master.
ON_ENV_INSTALL — runs a script after environment creation.
OPEN_INBOUND_PORTS — opens custom firewall ports during creation.
PATH — default executable search path.
STACK_NAME, STACK_PATH, and STACK_USER — describe the current managed stack.

What’s next?

Custom Environment Variables
Java Options and Arguments
Container Variables
Environment Configuration