openshift-docs/modules/deployments-exec-cmd-in-container.adoc

// Module included in the following assemblies:
//
// * applications/deployments/managing-deployment-processes.adoc

:_mod-docs-content-type: PROCEDURE
[id="deployments-exe-cmd-in-container_{context}"]
= Executing commands inside a container

You can add a command to a container, which modifies the container's startup behavior by overruling the image's `ENTRYPOINT`. This is different from a lifecycle hook, which instead can be run once per deployment at a specified time.

.Procedure

. Add the `command` parameters to the `spec` field of the `DeploymentConfig` object. You can also add an `args` field, which modifies the `command` (or the `ENTRYPOINT` if `command` does not exist).
+
[source,yaml]
----
kind: DeploymentConfig
apiVersion: apps.openshift.io/v1
metadata:
  name: example-dc
# ...
spec:
  template:
# ...
    spec:
     containers:
     - name: <container_name>
       image: 'image'
       command:
         - '<command>'
       args:
         - '<argument_1>'
         - '<argument_2>'
         - '<argument_3>'
----
+
For example, to execute the `java` command with the `-jar` and `/opt/app-root/springboots2idemo.jar` arguments:
+
[source,yaml]
----
kind: DeploymentConfig
apiVersion: apps.openshift.io/v1
metadata:
  name: example-dc
# ...
spec:
  template:
# ...
    spec:
      containers:
        - name: example-spring-boot
          image: 'image'
          command:
            - java
          args:
            - '-jar'
            - /opt/app-root/springboots2idemo.jar
# ...
----