packer_template.json

{
    "variables": {
        "app_name": null,
        "env_name": null,
        "lifecycle": null,
        "subnet_id": null,
        "source_ami": "ami-0d4cfd66",
        "ssh_keypair_name": null,
        "ssh_private_key_file": null,
        "war_path": null,
        "branch_name": null,
        "security_group_id_1": null,
        "security_group_id_2": null,
        "iam_instance_profile": "XXXXXXXX",
        "builder_instance":"c4.large",
        "TargetWarFileName": null,
    },
    "builders": [
        {
            "type": "amazon-ebs",
            "region": "us-east-1",
            "source_ami": "{{user `source_ami`}}",
            "instance_type": "{{user `builder_instance`}}",
            "ssh_username": "ec2-user",
            "ami_name": "{{user `app_name`}}-{{user `build_date`}}-{{user `env_name`}}",
            "subnet_id": "{{user `subnet_id`}}",
            "security_group_ids": [
              "{{user `security_group_id_1`}}",
              "{{user `security_group_id_2`}}"
            ],
            "ssh_keypair_name": "{{user `ssh_keypair_name`}}",
            "ssh_private_key_file": "{{user `ssh_private_key_file`}}",
            "ssh_private_ip": "true",
            "communicator": "ssh",
            "ssh_pty": true,
            "iam_instance_profile": "{{user `iam_instance_profile`}}",
            "tags": {
                "BranchName": "{{user `branch_name`}}",
            }
        }
    ], 
    "provisioners": [
        {
            "type": "file",
            "source": "{{user `war_path`}}",
            "destination": "/tmp/WAR_NAME.war"
        },
        {
            "type": "shell",
            "script": "script/tomcat_setup.sh",
            "execute_command":"chmod +x {{ .Path }}; {{ .Vars }} sudo -E sh {{ .Path }}",
            "environment_vars": [
                    "TargetWarFileName={{user `target_war_name`}}",
                    "ENV_NAME={{user `env_name`}}"
            ]
        }
    ]
}