OpenShift Environment Variables

External

• https://docs.openshift.com/container-platform/latest/dev_guide/environment_variables.html

Internal

• OpenShift Concepts

Overview

Environment variables can be declared in:

• deployment configurations or pod templates. This is an example of how to set custom environment variables in a pod template.
• replication controllers.
• build configurations.

They can also be set with:

oc set env

Some environment variables are automatically exported:

Environment Variables Corresponding to Other Services

• <SVCNAME>_SERVICE_HOST
• <SVCNAME>_SERVICE_PORT

TOMCAT2_PORT=tcp://172.30.29.184:8080
TOMCAT2_PORT_8080_TCP=tcp://172.30.29.184:8080
TOMCAT2_PORT_8080_TCP_ADDR=172.30.29.184
TOMCAT2_PORT_8080_TCP_PORT=8080
TOMCAT2_PORT_8080_TCP_PROTO=tcp
TOMCAT2_PORT_8443_TCP=tcp://172.30.29.184:8443
TOMCAT2_PORT_8443_TCP_ADDR=172.30.29.184
TOMCAT2_PORT_8443_TCP_PORT=8443
TOMCAT2_PORT_8443_TCP_PROTO=tcp
TOMCAT2_PORT_8778_TCP=tcp://172.30.29.184:8778
TOMCAT2_PORT_8778_TCP_ADDR=172.30.29.184
TOMCAT2_PORT_8778_TCP_PORT=8778
TOMCAT2_PORT_8778_TCP_PROTO=tcp
TOMCAT2_SERVICE_HOST=172.30.29.184
TOMCAT2_SERVICE_PORT=8080
TOMCAT2_SERVICE_PORT_8080_TCP=8080
TOMCAT2_SERVICE_PORT_8443_TCP=8443
TOMCAT2_SERVICE_PORT_8778_TCP=8778

Note that the environment variables corresponding to a specific service are only injected in a pod if the service existed at the time the pod deployment. For more about services and communication between services see:

OpenShift Service Concepts