Cloud Architect Design Tools:Specify values for template variables

Data types of template variables

Define local template variables

In this example, an ECS template is used to describe how to specify values for different types of variables.

1. Create an ECS template. The following figure shows an example. For more information, see Create a custom template.

2. Define the following variables for the template. For more information, see Configure template variables.

   Variable	Variable value	Default value
   count	${count}	1
   instance_name	${name}	ecs
   system_disk_size	${storage}	40
   data_disks	${data_disk}	[]
   tags	${tags}	{"cadt":"uat"}

3. After you complete the settings, find the template on the My Solutions page to view the defined variables. You can see that the variable types include Integer, String, List<Map>, and Map.

Specify values for template variables by using Java code

If you are familiar with the Java programming language, you can use Java code to specify values for template variables. The following sample code provides an example:

variables = Maps.newHashMap();

// Specify a value for the ${name} variable.
variables.put("${name}", "ecs123");

// Specify a value for the ${count} variable.
variables.put("${count}", "1");

// Specify a value for the ${storage} variable.
variables.put("${storage}", "40");

// Specify a value for the ${data_disk} variable.
List<Map<String, String>> disks = Lists.newArrayList();
Map<String, String> disk1 = Maps.newHashMap();
disk1.put("name", "disk1");
disk1.put("size", "50");
disk1.put("category", "cloud_essd");
disk1.put("performance_level", "PL1");
disk1.put("encrypted", "false");
disks.add(disk1);

Map<String, String> disk2 = Maps.newHashMap();
disk2.put("name", "disk2");
disk2.put("size", "60");
disk2.put("category", "cloud_essd");
disk2.put("performance_level", "PL1");
disk2.put("encrypted", "false");
disks.add(disk2);
variables.put("${data_disk}", JSON.toJSONString(disks));

// Specify a value for the ${tags} variable.
Map<String, String> tags = Maps.newHashMap();
tags.put("role", "dev");
tags.put("project", "abc");
variables.put("${tags}", JSON.toJSONString(tags));

// After you specify values for the variables, call the following API operation to create an application: 
createApplicationRequest = new CreateApplicationRequest()
        .setTemplateId(templateId)      // The ID of the template that uses the variables.
        .setName(appName)                  // The ID of the application.
        .setAreaId(region)                       // The region in which the template resides.
        .setVariables(variables)              // Pass the variables.
        .setClientToken(UUID.randomUUID().toString());

Define global template variables

In this example, an ECS template is used. The following section describes how to configure template variables.

1. Create an ECS template. The following figure shows an example. For more information, see Create a custom template.

2. Define the following variables for the template. For more information, see Configure template variables.

3. Specify values for template variables by using Java code

variables = Maps.newHashMap();

// Specify a value for the ${name1} variable.
variables.put("${name1}", "ecs001");

// Specify a value for the ${name2} variable.
variables.put("${name2}", "ecs002");

// Specify a value for the ${sys} variable.
variables.put("${sys}", "erp");

// Specify a value for the ${storage} variable.
variables.put("${storage}", "80");


// After you specify values for the variables, call the following API operation to create an application: 
createApplicationRequest = new CreateApplicationRequest()
        .setTemplateId(templateId)      // The ID of the template that uses the variables.
        .setName(appName)                  // The ID of the application.
        .setAreaId(region)                       // The region in which the template resides.
        .setVariables(variables)              // Pass the variables.
        .setClientToken(UUID.randomUUID().toString());

Configure template variables by using a YAML file

You can use the CADT command-line tool to call API operations to deploy CADT applications. The basic information required to create an application is defined in a YAML configuration file. For more information, see Usage notes of CADT command-line tool.