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// Module included in the following assemblies:
//
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// * cli_reference/developer_cli_odo/creating-a-multicomponent-application-with-odo.adoc
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[id="linking-both-components_{context}"]
= Linking both components
Components running on the cluster need to be connected in order to interact. {product-title} provides linking mechanisms to publish communication bindings from a program to its clients.
.Procedure
. List all the components that are running on the cluster:
+
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[source,terminal]
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----
$ odo list
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----
+
.Example output
[source,terminal]
----
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OpenShift Components:
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APP NAME PROJECT TYPE SOURCETYPE STATE
app backend testpro openjdk18 binary Pushed
app frontend testpro nodejs local Pushed
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----
. Link the current front-end component to the backend:
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[source,terminal]
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----
$ odo link backend --port 8080
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----
+
.Example output
[source,terminal]
----
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✓ Component backend has been successfully linked from the component frontend
Following environment variables were added to frontend component:
- COMPONENT_BACKEND_HOST
- COMPONENT_BACKEND_PORT
----
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The configuration information of the back-end component is added to the front-end component and the front-end component restarts.
