7.9. Unattended Use, Customization, and Image Remastering

You can create a customized Discovery ISO to automate the image configuration process after booting. The Discovery image uses a Linux kernel for the operating system, which passes kernel parameters to configure the discovery service. These kernel parameters include the following entries:

proxy.url
The URL of the Capsule Server or Satellite Server providing the Discovery service.
proxy.type
The proxy type. This is usually set to proxy to connect to Capsule Server. This parameter also supports a legacy foreman option, where communication goes directly to Satellite Server instead of a Capsule Server.
fdi.pxmac
The MAC address of the primary interface in the format of AA:BB:CC:DD:EE:FF. This is the interface you aim to use for communicating with Capsule Server. In automated mode, the first NIC (using network identifiers in alphabetical order) with a link is used. In semi-automated mode, a screen appears and requests you to select the correct interface.
fdi.pxip, fdi.pxgw, fdi.pxdns
Manually configures IP address (fdi.pxip), the gateway (fdi.pxgw), and the DNS (fdi.pxdns) for the primary network interface. If your omit these parameters, the image uses DHCP to configure the network interface.
fdi.pxfactname1, fdi.pxfactname2 …​ fdi.pxfactnameN
Use to specify custom fact names.
fdi.pxfactvalue1, fdi.pxfactvalue2 …​ fdi.pxfactvalueN
The values for each custom fact. Each value corresponds to a fact name. For example, fdi.pxfactvalue1 sets the value for the fact named with fdi.pxfactname1.
fdi.pxauto
To set automatic or semi-automatic mode. If set to 0, the image uses semi-automatic mode, which allows you to confirm your choices through a set of dialog options. If set to 1, the image uses automatic mode and proceeds without any confirmation.
fdi.initnet
By default, the image initializes all network interfaces (value all). When this setting is set to bootif, only the network interface it was network-booted from will be initialized.
fdi.rootpw
By default, the root account is locked. Use this option to set a root password. You can enter both clear and encrypted passwords.
fdi.ssh
By default, the SSH service is disabled. Set this to 1 or true to enable SSH access.
fdi.ipv4.method
By default, NetworkManager IPv4 method setting is set to auto. This option overrides it, set it to ignore to disable the IPv4 stack. This option works only in DHCP mode.
fdi.ipv6.method
By default, NetworkManager IPv6 method setting is set to auto. This option overrides it, set it to ignore to disable the IPv6 stack. This option only works in DHCP mode.

Using the discovery-remaster Tool to Remaster an OS Image

Satellite Server provides the discovery-remaster tool in the foreman-discovery-image package. This tool remasters the image to include these kernel parameters. To remaster the image, run the discovery-remaster tool. For example: 

# discovery-remaster ~/iso/foreman-discovery-image-3.4.4-5.iso \
"fdi.pxip=192.168.140.20/24 fdi.pxgw=192.168.140.1 \
fdi.pxdns=192.168.140.2 proxy.url=https://satellite.example.com:9090 \
proxy.type=proxy fdi.pxfactname1=customhostname fdi.pxfactvalue1=myhost fdi.pxmac=52:54:00:be:8e:8c fdi.pxauto=1"

Copy this media to either a CD, DVD, or a USB stick. For example, to copy to a USB stick at /dev/sdb: 

# dd bs=4M \
if=/usr/share/foreman-discovery-image/foreman-discovery-image-3.4.4-5.iso \
of=/dev/sdb

Insert the Discovery boot media into a bare metal host, start the host, and boot from the media.

For more information about provisioning discovered hosts, see 「Creating Hosts from Discovered Hosts」.