This section describes how to use the cloud-init package to handle the early initialization of instances.

About cloud-init

Cloud-init is a Linux package responsible for handling the early initialization of instances. If available in the distributions, it allows for configuration of many common parameters of the instance directly after installation. This creates a fully functional instance that is configured based on a series of inputs.

Cloud-init's behavior can be configured via user-data. User-data can be given by the user at instance launch time. This is typically done by attaching a secondary disk in ISO format that cloud-init will look for at first boot time. This disk contains all early configuration data that will be applied at that time.

The SD-WAN Orchestrator supports cloud-init and all essential configurations can be packaged in an ISO image.

Create the cloud-init meta-data File

The final installation configuration options are set with a pair of cloud-init configuration files. The first installation configuration file contains the metadata. Create this file with a text editor and label it meta-data. This file provides information that identifies the instance of SD-WAN Orchestrator being installed. The instance-id can be any identifying name, and the local-hostname should be a host name that follows your site standards, for example: 

instance-id: vco01
local-hostname: vco-01

Additionally, you can specify network interface information (if the network is not configured via DHCP, for example): 

instance-id: vco01
local-hostname: vco-01
network-interfaces: |
  auto eth0
  iface eth0 inet static
  address 10.0.1.2
  network 10.0.1.0
  netmask 255.255.255.0
  broadcast 10.0.1.255
  gateway 10.0.1.1

Create the cloud-init user-data File

The second installation configuration option file is the user data file. This file provides information about users on the system. Create it with a text editor and call it user-data. This file will be used to enable access to the installation of SD-WAN Orchestrator.  The following is an example of what the user-data file will look like: 

#cloud-config 
            password: Velocloud123 
            chpasswd: {expire: False} 
            ssh_pwauth: True 
            ssh_authorized_keys:
              - ssh-rsa AAA...SDvz user1@yourdomain.com
              - ssh-rsa AAB...QTuo user2@yourdomain.com
            vco:
              super_users:
                list: |
                  user1@yourdomain.com:password1
                remove_default_users: True
              system_properties:
                 list: |
                    mail.smtp.port:34
                    mail.smtp.host:smtp.yourdomain.com
                    service.maxmind.enable:True
                    service.maxmind.license:todo_license
                    service.maxmind.userid:todo_user
                    service.twilio.phoneNumber:222123123
                    network.public.address:222123123
            write_files:
               - path: /etc/nginx/velocloud/ssl/server.crt
                 permissions: '0644'
                 content: "-----BEGIN CERTIFICATE-----\nMI….ow==\n-----END CERTIFICATE-----\n"
               - path: /etc/nginx/velocloud/ssl/server.key
                 permissions: '0600'
                 content: "-----BEGIN RSA PRIVATE KEY-----\nMII...D/JQ==\n-----END RSA PRIVATE KEY-----\n" 
               - path: /etc/nginx/velocloud/ssl/velocloudCA.crt
This user-data file enables the default user, vcadmin, to login either with a password or with an SSH key. The use of both methods is possible, but not required. The password login is enabled by the password and chpasswd lines.
  • The password contains the plain-text password for the vcadmin user.
  • The chpasswd line turns off password expiration to prevent the first login from immediately prompting for a change of password. This is optional.
Note: If you set a password, it is recommended that you change it when you first log in because the password has been stored in a plain text file.

The ssh_pwauth line enables SSH login. The ssh_authorized_keys line begins a block of one or more authorized keys. Each public SSH key listed on the ssh-rsa lines will be added to the vcadmin ~/.ssh/authorized_keys file.

In this example, two keys are listed. For this example, the key has been truncated. In a real file, the entire public key must be listed. Note that the ssh-rsa lines must be preceded by two spaces, followed by a hyphen, followed by another space.

The vco section specifies configured SD-WAN Orchestrator services.

super_users contains list of VMware Super Operator accounts and corresponding passwords. 

The system_properties section allows to customize Orchestrator System Properties. See System Properties for details regarding system properties configuration.

The write_files section allows to replace files on the system. By default, SD-WAN Orchestrator web services are configured with self-signed SSL certificate. If you would like to provide different SSL certificate, the above example replaces the server.crt and server.key files in the /etc/nginx/velocloud/ssl/ folder with user-supplied files.
Note: The server.key file must be unencrypted. Otherwise, the service will fail to start without the key password.

Create an ISO file

Once you have completed your files, they need to be packaged into an ISO image. This ISO image is used as a virtual configuration CD with the virtual machine. This ISO image, called vco01-cidata.iso, is created with the following command on a Linux system: 

genisoimage -output vco01-cidata.iso -volid cidata -joliet -rock user-data meta-data

Transfer the newly created ISO image to the datastore on the host running VMware.