ec2_instance - Fix issue with launch template

changelogs/fragments/20241004-ec2_instance-fix-issue-with-launch_template-when-there-no-default-subnet.yml

@@ -0,0 +1,3 @@
+---
+minor_changes:
+  - ec2_instance - Fix the issue when trying to run instances using launch template in an AWS environment where no default subnet is defined(https://github.com/ansible-collections/amazon.aws/issues/2321).

plugins/modules/ec2_instance.py

@@ -1567,9 +1567,9 @@ def build_network_spec(client, module: AnsibleAWSModule) -> List[Dict[str, Any]]
                 for inty in network_interfaces
             ]
         )
-    elif not network and not network_interfaces_ids:
-        # They did not specify any network interface configuration
-        # build network interface using subnet_id and security group(s) defined on the module
+    elif not network and not network_interfaces_ids and not module.params.get("launch_template"):
+        # No network interface configuration specified and no launch template
+        # Build network interface using subnet_id and security group(s) defined in the module
         interfaces.append(ansible_to_boto3_eni_specification(client, module, {}, vpc_subnet_id, groups))
     elif network:
         # handle list of `network.interfaces` options
@@ -1796,9 +1796,14 @@ def build_run_instance_spec(client, module: AnsibleAWSModule, current_count: int
 
     # Validate network parameters
     validate_network_params(module, nb_instances)
-
-    spec["NetworkInterfaces"] = build_network_spec(client, module)
-    spec["BlockDeviceMappings"] = build_volume_spec(params)
+    # Build network specs
+    network_specs = build_network_spec(client, module)
+    if network_specs:
+        spec["NetworkInterfaces"] = network_specs
+    # Build volume specs
+    volume_specs = build_volume_spec(params)
+    if volume_specs:
+        spec["BlockDeviceMappings"] = volume_specs
 
     tag_spec = build_instance_tags(params)
     if tag_spec is not None:
@@ -2635,17 +2640,18 @@ def build_network_filters(client, module: AnsibleAWSModule) -> Dict[str, List[st
 
 
 def build_filters(client, module: AnsibleAWSModule) -> Dict[str, Any]:
-    filters = {
-        # all states except shutting-down and terminated
-        "instance-state-name": ["pending", "running", "stopping", "stopped"],
-    }
-    if isinstance(module.params.get("instance_ids"), string_types):
-        filters["instance-id"] = [module.params.get("instance_ids")]
-    elif isinstance(module.params.get("instance_ids"), list) and len(module.params.get("instance_ids")):
-        filters["instance-id"] = module.params.get("instance_ids")
+    # all states except shutting-down and terminated
+    instance_state_names = ["pending", "running", "stopping", "stopped"]
+    filters = {}
+    instance_ids = module.params.get("instance_ids")
+    if isinstance(instance_ids, string_types):
+        filters = {"instance-id": [instance_ids], "instance-state-name": instance_state_names}
+    elif isinstance(instance_ids, list) and len(instance_ids):
+        filters = {"instance-id": instance_ids, "instance-state-name": instance_state_names}
     else:
-        # Network filters
-        filters.update(build_network_filters(client, module))
+        if not module.params.get("launch_template"):
+            # Network filters
+            filters.update(build_network_filters(client, module))
         if module.params.get("name"):
             filters["tag:Name"] = [module.params.get("name")]
         elif module.params.get("tags"):
@@ -2657,6 +2663,10 @@ def build_filters(client, module: AnsibleAWSModule) -> Dict[str, Any]:
             filters["image-id"] = [module.params.get("image_id")]
         elif (module.params.get("image") or {}).get("id"):
             filters["image-id"] = [module.params.get("image", {}).get("id")]
+
+        if filters:
+            # add the instance state filter if any filter key was provided
+            filters["instance-state-name"] = instance_state_names
     return filters
 
 
@@ -2864,7 +2874,9 @@ def main():
         filters = build_filters(client, module)
 
     try:
-        existing_matches = find_instances(client, module, filters=filters)
+        existing_matches = []
+        if filters:
+            existing_matches = find_instances(client, module, filters=filters)
 
         if state in ("terminated", "absent"):
             if existing_matches:

tests/integration/targets/ec2_instance_launch_template/aliases

@@ -0,0 +1,3 @@
+time=5m
+cloud/aws
+ec2_instance

tests/integration/targets/ec2_instance_launch_template/meta/main.yml

@@ -0,0 +1,6 @@
+---
+dependencies:
+  - role: setup_ec2_facts
+  - role: setup_ec2_instance_env
+    vars:
+      ec2_instance_test_name: launch-template

tests/integration/targets/ec2_instance_launch_template/tasks/main.yml

@@ -0,0 +1,112 @@
+---
+- module_defaults:
+    group/aws:
+      access_key: "{{ aws_access_key }}"
+      secret_key: "{{ aws_secret_key }}"
+      session_token: "{{ security_token | default(omit) }}"
+      region: "{{ aws_region }}"
+  block:
+    - name: Create a Launch template
+      community.aws.ec2_launch_template:
+        template_name: "{{ resource_prefix }}-template"
+        instance_type: t2.micro
+        image_id: "{{ ec2_ami_id }}"
+        block_device_mappings:
+          - device_name: /dev/sdb
+            ebs:
+              volume_size: 20
+              delete_on_termination: true
+              volume_type: standard
+        network_interfaces:
+          - device_index: 0
+            associate_public_ip_address: false
+            delete_on_termination: true
+            subnet_id: "{{ testing_subnet_a.subnet.id }}"
+            description: "A network interface from the testing subnet a"
+      register: _launch_template
+
+    - name: Create EC2 instance using launch template (check mode)
+      amazon.aws.ec2_instance:
+        state: present
+        wait: true
+        launch_template:
+          id: "{{ _launch_template.template.launch_template_id }}"
+      register: _create_check
+      check_mode: true
+
+    - name: Ensure module reported change while running in check mode
+      ansible.builtin.assert:
+        that:
+          - _create_check is changed
+          - '"instance_ids" not in _create_check'
+
+    - name: Create EC2 instance using launch template
+      amazon.aws.ec2_instance:
+        state: present
+        launch_template:
+          id: "{{ _launch_template.template.launch_template_id }}"
+        wait: true
+      register: _instance_a
+
+    - name: Set instances to delete
+      ansible.builtin.set_fact:
+        test_instance_ids: "{{ _instance_a.instance_ids | default([]) }}"
+
+    - name: Validate instance created as expected
+      ansible.builtin.assert:
+        that:
+          - _instance_a is changed
+          - '"instance_ids" in _instance_a'
+          - '"instances" in _instance_a'
+          - _instance_a.instances | length == 1
+          - _instance_a.instances[0].instance_type == 't2.micro'
+          - _instance_a.instances[0].image_id == ec2_ami_id
+          - _instance_a.instances[0].network_interfaces | length == 1
+          - _instance_a.instances[0].network_interfaces[0].subnet_id == testing_subnet_a.subnet.id
+          - _instance_a.instances[0].network_interfaces[0].description == "A network interface from the testing subnet a"
+          # AWS adds automatically a tag with the launch template id
+          - '"aws:ec2launchtemplate:id" in _instance_a.instances[0].tags'
+          - _instance_a.instances[0].tags["aws:ec2launchtemplate:id"] == _launch_template.template.launch_template_id
+
+    - name: Create antoher EC2 instance using launch template and some override parameters
+      amazon.aws.ec2_instance:
+        state: present
+        launch_template:
+          id: "{{ _launch_template.template.launch_template_id }}"
+        instance_type: t3.nano
+        network_interfaces:
+          - device_index: 0
+            assign_public_ip: false
+            delete_on_termination: true
+            subnet_id: "{{ testing_subnet_b.subnet.id }}"
+            description: "A network interface from the testing subnet b"
+        wait: true
+      register: _instance_b
+
+    - name: Set instances to delete
+      ansible.builtin.set_fact:
+        test_instance_ids: "{{ test_instance_ids + _instance_b.instance_ids | default([])}}"
+
+    - name: Validate instance created as expected
+      ansible.builtin.assert:
+        that:
+          - _instance_b is changed
+          - '"instance_ids" in _instance_b'
+          - _instance_a.instance_ids != _instance_b.instance_ids
+          - _instance_b.instances | length == 1
+          - _instance_b.instances[0].instance_type == 't3.nano'
+          - _instance_b.instances[0].image_id == ec2_ami_id
+          - _instance_b.instances[0].network_interfaces | length == 1
+          - _instance_b.instances[0].network_interfaces[0].subnet_id == testing_subnet_b.subnet.id
+          - _instance_b.instances[0].network_interfaces[0].description == "A network interface from the testing subnet b"
+          # AWS adds automatically a tag with the launch template id
+          - '"aws:ec2launchtemplate:id" in _instance_b.instances[0].tags'
+          - _instance_b.instances[0].tags["aws:ec2launchtemplate:id"] == _launch_template.template.launch_template_id
+
+  always:
+    - name: Delete instances
+      amazon.aws.ec2_instance:
+        state: absent
+        instance_ids: "{{ test_instance_ids }}"
+        wait: true
+      when: test_instance_ids is defined