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Appendix A. Understanding the luks_tang_inventory.yml file

A.1. Configuration parameters for disk encryption
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hc_nodes (required)

A list of hyperconverged hosts that uses the back-end FQDN of the host, and the configuration details of those hosts. Configuration that is specific to a host is defined under that host’s back-end FQDN. Configuration that is common to all hosts is defined in the vars: section. 

hc_nodes:
  hosts:
    host1backend.example.com:
      [configuration specific to this host]
    host2backend.example.com:
    host3backend.example.com:
    host4backend.example.com:
    host5backend.example.com:
    host6backend.example.com:
  vars:
    [configuration common to all hosts]
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blacklist_mpath_devices (optional)

By default, Red Hat Virtualization Host enables multipath configuration, which provides unique multipath names and worldwide identifiers for all disks, even when disks do not have underlying multipath configuration. Include this section if you do not have multipath configuration so that the multipath device names are not used for listed devices. Disks that are not listed here are assumed to have multipath configuration available, and require the path format /dev/mapper/<WWID> instead of /dev/sdx when defined in subsequent sections of the inventory file.

On a server with four devices (sda, sdb, sdc and sdd), the following configuration blacklists only two devices. The path format /dev/mapper/<WWID> is expected for devices not in this list. 

hc_nodes:
  hosts:
    host1backend.example.com:
      blacklist_mpath_devices:
        - sdb
        - sdc
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gluster_infra_luks_devices (required)

A list of devices to encrypt and the encryption passphrase to use for each device. 

hc_nodes:
  hosts:
    host1backend.example.com:
      gluster_infra_luks_devices:
        - devicename: /dev/sdb
          passphrase: Str0ngPa55#
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devicename
The name of the device in the format /dev/sdx.
passphrase
The password to use for this device when configuring encryption. After disk encryption with Network-Bound Disk Encryption (NBDE) is configured, a new random key is generated, providing greater security.
rootpassphrase (required)

The password that you used when you selected Encrypt my data during operating system installation on this host. 

hc_nodes:
  hosts:
    host1backend.example.com:
      rootpassphrase: h1-Str0ngPa55#
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rootdevice (required)

The root device that was encrypted when you selected Encrypt my data during operating system installation on this host. 

hc_nodes:
  hosts:
    host1backend.example.com:
      rootdevice: /dev/sda2
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networkinterface (required)

The network interface this host uses to reach the NBDE key server. 

hc_nodes:
  hosts:
    host1backend.example.com:
      networkinterface: ens3s0f0
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ip_version (required)

Whether to use IPv4 or IPv6 networking. Valid values are IPv4 and IPv6. There is no default value. Mixed networks are not supported. 

hc_nodes:
  vars:
    ip_version: IPv4
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ip_config_method (required)

Whether to use DHCP or static networking. Valid values are dhcp and static. There is no default value. 

hc_nodes:
  vars:
    ip_config_method: dhcp
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The other valid value for this option is static, which requires the following additional parameters and is defined individually for each host: 

hc_nodes:
  hosts:
    host1backend.example.com:
      ip_config_method: static
      host_ip_addr: 192.168.1.101
      host_ip_prefix: 24
      host_net_gateway: 192.168.1.100
    host2backend.example.com:
      ip_config_method: static
      host_ip_addr: 192.168.1.102
      host_ip_prefix: 24
      host_net_gateway: 192.168.1.100
    host3backend.example.com:
      ip_config_method: static
      host_ip_addr: 192.168.1.102
      host_ip_prefix: 24
      host_net_gateway: 192.168.1.100
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gluster_infra_tangservers

The address of your NBDE key server or servers, including http://. If your servers use a port other than the default (80), specify a port by appending :_port_ to the end of the URL. 

hc_nodes:
  vars:
    gluster_infra_tangservers:
      - url: http://key-server1.example.com
      - url: http://key-server2.example.com:80
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A.2. Example luks_tang_inventory.yml
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Dynamically allocated IP addresses

hc_nodes:
  hosts:
    host1-backend.example.com:
      blacklist_mpath_devices:
        - sda
        - sdb
        - sdc
      gluster_infra_luks_devices:
        - devicename: /dev/sdb
          passphrase: dev-sdb-encrypt-passphrase
        - devicename: /dev/sdc
          passphrase: dev-sdc-encrypt-passphrase
      rootpassphrase: host1-root-passphrase
      rootdevice: /dev/sda2
      networkinterface: eth0
    host2-backend.example.com:
      blacklist_mpath_devices:
        - sda
        - sdb
        - sdc
      gluster_infra_luks_devices:
        - devicename: /dev/sdb
          passphrase: dev-sdb-encrypt-passphrase
        - devicename: /dev/sdc
          passphrase: dev-sdc-encrypt-passphrase
      rootpassphrase: host2-root-passphrase
      rootdevice: /dev/sda2
      networkinterface: eth0
    host3-backend.example.com:
      blacklist_mpath_devices:
        - sda
        - sdb
        - sdc
      gluster_infra_luks_devices:
        - devicename: /dev/sdb
          passphrase: dev-sdb-encrypt-passphrase
        - devicename: /dev/sdc
          passphrase: dev-sdc-encrypt-passphrase
      rootpassphrase: host3-root-passphrase
      rootdevice: /dev/sda2
      networkinterface: eth0
  vars:
    ip_version: IPv4
    ip_config_method: dhcp
    gluster_infra_tangservers:
      - url: http://key-server1.example.com:80
      - url: http://key-server2.example.com:80
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Static IP addresses

hc_nodes:
  hosts:
    host1-backend.example.com:
      blacklist_mpath_devices:
        - sda
        - sdb
        - sdc
      gluster_infra_luks_devices:
        - devicename: /dev/sdb
          passphrase: dev-sdb-encrypt-passphrase
        - devicename: /dev/sdc
          passphrase: dev-sdc-encrypt-passphrase
      rootpassphrase: host1-root-passphrase
      rootdevice: /dev/sda2
      networkinterface: eth0
      host_ip_addr: host1-static-ip
      host_ip_prefix: network-prefix
      host_net_gateway: default-network-gateway
    host2-backend.example.com:
      blacklist_mpath_devices:
        - sda
        - sdb
        - sdc
      gluster_infra_luks_devices:
        - devicename: /dev/sdb
          passphrase: dev-sdb-encrypt-passphrase
        - devicename: /dev/sdc
          passphrase: dev-sdc-encrypt-passphrase
      rootpassphrase: host2-root-passphrase
      rootdevice: /dev/sda2
      networkinterface: eth0
      host_ip_addr: host1-static-ip
      host_ip_prefix: network-prefix
      host_net_gateway: default-network-gateway
    host3-backend.example.com:
      blacklist_mpath_devices:
        - sda
        - sdb
        - sdc
      gluster_infra_luks_devices:
        - devicename: /dev/sdb
          passphrase: dev-sdb-encrypt-passphrase
        - devicename: /dev/sdc
          passphrase: dev-sdc-encrypt-passphrase
      rootpassphrase: host3-root-passphrase
      rootdevice: /dev/sda2
      networkinterface: eth0
      host_ip_addr: host1-static-ip
      host_ip_prefix: network-prefix
      host_net_gateway: default-network-gateway
  vars:
    ip_version: IPv4
    ip_config_method: static
    gluster_infra_tangservers:
      - url: http://key-server1.example.com:80
      - url: http://key-server2.example.com:80
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