ODL Beryllium and CentOS 7.2.1511:
```
-packer build -var-file=vars/opendaylight-4.0.0-centos-7.2.1511.json templates/libvirt.json
+packer build -var-file=vars/opendaylight-4.0.0.json -var-file=vars/centos-7.2.1511.json templates/libvirt.json
```
To build the same box with VirtualBox as the virtualization provider:
```
-packer build -var-file=vars/opendaylight-4.0.0-centos-7.2.1511.json templates/virtualbox.json
+packer build -var-file=vars/opendaylight-4.0.0.json -var-file=vars/centos-7.2.1511.json templates/virtualbox.json
```
To build a Beryllium SR1 Docker container:
```
-packer build -var-file=vars/opendaylight-4.1.0-centos-7.2.1511.json templates/docker.json
+packer build -var-file=vars/opendaylight-4.1.0.json -var-file=vars/centos-7.2.1511.json templates/docker.json
```
Note that LibVirt, VirtualBox and Docker will need to work on your local system