template.json

{
	"variables": {
		"output_path": "./output"
	},
	"builders": [
		{
			"type": "vagrant",
			"source_path": "centos/7",
			"ssh_port": 22,
	        "ssh_username": "vagrant",
	        "communicator": "ssh",
	        "add_force": true,
	        "provider": "virtualbox",
			"output_dir": "{{user `output_path`}}/vagrant"
		},
		{
			"type": "docker",
			"image": "centos:7",
			"export_path": "{{user `output_path`}}/docker/image.tar"
		}
	],
	"provisioners": [
		{
			"type": "shell",
			"inline": "yum install -y sudo",
			"only": ["docker"]
		},
		{
			"type": "shell",
			"inline": [
				"echo Starting Provisioning",
				"sudo rpm --import http://packages.irontec.com/public.key",
    			"REPOFILE=irontec.repo",
    			"cat <<'EOF' > /tmp/${REPOFILE}\n[irontec]\nname=Irontec RPMs repository\nbaseurl=http://packages.irontec.com/centos/$releasever/$basearch/\nEOF",
    			"sudo mv /tmp/${REPOFILE} /etc/yum.repos.d/",
    			"sudo yum install -y sngrep",
    			"sudo rm -f /etc/yum.repos.d/${REPOFILE}"
			]
		}
	],
	"post-processors": [
		{
			"type": "docker-import",
			"repository": "zaleos",
			"tag": "demo",
			"only": ["docker"]
		}
	]
}