Using multiple templates

In this step, you will explore a template that imports other templates.

After incorporating these templates, your configuration only needs to call a single template to create a deployment with all of these resources.

Open the template for a network

Open the template named compute-engine-template.py:

cd deploymentmanager-samples/examples/v2/step_by_step_guide/step6_use_multiple_templates/python

nano compute-engine-template.py  # use your preferred text editor

This template imports other templates, for all the resources in the deployment: vm-template.py, vm-template-2.py for VMs, network-template.py for a network, and firewall-template.py for a firewall rule.

# Copyright 2016 Google Inc. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

"""Creates the Compute Engine."""


def GenerateConfig(context):
  """Creates the Compute Engine with network and firewall."""

  resources = [{
      'name': 'vm-1',
      'type': 'vm-template.py'
  }, {
      'name': 'vm-2',
      'type': 'vm-template-2.py'
  }, {
      'name': 'network-1',
      'type': 'network-template.py'
  }, {
      'name': 'firewall-1',
      'type': 'firewall-template.py'
  }]
  return {'resources': resources}

View the configuration

Open the configuration file for the deployment:

cd deploymentmanager-samples/examples/v2/step_by_step_guide/step6_use_multiple_templates/python

nano config-with-many-templates.yaml  # use your preferred text editor

Notice that the configuration did not directly call the other templates. However, the other templates are imported because compute-engine-template.py depends on the other templates.

# Copyright 2016 Google Inc. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

imports:
- path: vm-template.py
- path: vm-template-2.py
- path: network-template.py
- path: firewall-template.py
- path: compute-engine-template.py

resources:
- name: compute-engine-setup
  type: compute-engine-template.py

Save the configuration and deploy it

Run this command to deploy the configuration:

gcloud deployment-manager deployments create deployment-with-many-templates \
  --config config-with-many-templates.yaml

To view the deployment, run:

gcloud deployment-manager deployments describe deployment-with-many-templates

Looking ahead: template properties and environment variables

Next, you will replace some hard-coded parts of templates with reusable patterns such as custom template and environment variables.

Delete Your Deployment

We recommend that you delete the deployment to avoid charges. You don't need this deployment for the next step. Run the following command to delete the deployment:

gcloud deployment-manager deployments delete deployment-with-references
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