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Updating a User-Created Service

Updated: April 18, 2017

You can easily view and update the configuration of a deployed app by using the dcos marathon command.

Note: The process for updating packages from the DC/OS Universe is different. For more information, see the documentation.

Update an Environment Variable

Use the dcos marathon app update command from the DC/OS CLI to update any aspect of your service’s JSON service definition. For instance, follow the instructions below to update the environment variable (env field) of the service definition.

A single element of the env field can be updated by specifying a JSON string in a command argument.

dcos marathon app update test-app env='{"APISERVER_PORT":"25502"}'

Now, run the command below to see the result of your update:

dcos marathon app show test-app | jq '.env'

Update all Environment Variables

The entire env field can also be updated by specifying a JSON file in a command argument.

First, save the existing environment variables to a file:

dcos marathon app show test-app | jq .env >env_vars.json

The file will contain the JSON for the env field:

{ "SCHEDULER_DRIVER_PORT": "25501", }

Now edit the env_vars.json file. Make the JSON a valid object by enclosing the file contents with { "env" :} and add your update:

{ "env" : { "APISERVER_PORT" : "25502", "SCHEDULER_DRIVER_PORT" : "25501" } }

Specify this CLI command with the JSON file specified:

dcos marathon app update test-app < env_vars.json

View the results of your update:

dcos marathon app show test-app | jq '.env'