Chapter 5. Optional: Enabling disk encryption You can enable encryption of installation disks using either the TPM v2 or Tang encryption modes. Note In some situations, when you enable TPM disk encryption in the firmware for a bare-metal host and then boot it from an ISO that you generate with the Assisted Installer, the cluster deployment can get stuck. This can happen if there are left-over TPM encryption keys from a installation on the host. For more information, see BZ#2011634 . If you experience this problem, contact Red Hat support. 5.1. Enabling TPM v2 encryption Prerequisites Check to see if TPM v2 encryption is enabled in the BIOS on each host. Most Dell systems require this. Check the manual for your computer. The Assisted Installer will also validate that TPM is enabled in the firmware. See the disk-encruption model in the Assisted Installer API for additional details. Important Verify that a TPM v2 encryption chip is installed on each node and enabled in the firmware. Procedure Optional: Using the UI, in the Cluster details step of the user interface wizard, choose to enable TPM v2 encryption on either the control plane nodes, workers, or both. Optional: Using the API, follow the "Modifying hosts" procedure. Set the disk_encryption.enable_on setting to all , masters , or workers . Set the disk_encryption.mode setting to tpmv2 . Refresh the API token: USD source refresh-token Enable TPM v2 encryption: USD curl https://api.openshift.com/api/assisted-install/v2/clusters/USD{CLUSTER_ID} \ -X PATCH \ -H "Authorization: Bearer USD{API_TOKEN}" \ -H "Content-Type: application/json" \ -d ' { "disk_encryption": { "enable_on": "none", "mode": "tpmv2" } } ' | jq Valid settings for enable_on are all , master , worker , or none . 5.2. Enabling Tang encryption Prerequisites You have access to a Red Hat Enterprise Linux (RHEL) 8 machine that can be used to generate a thumbprint of the Tang exchange key. Procedure Set up a Tang server or access an existing one. See Network-bound disk encryption for instructions. You can set multiple Tang servers, but the Assisted Installer must be able to connect to all of them during installation. On the Tang server, retrieve the thumbprint for the Tang server using tang-show-keys : USD tang-show-keys <port> Optional: Replace <port> with the port number. The default port number is 80 . Example thumbprint 1gYTN_LpU9ZMB35yn5IbADY5OQ0 Optional: Retrieve the thumbprint for the Tang server using jose . Ensure jose is installed on the Tang server: USD sudo dnf install jose On the Tang server, retrieve the thumbprint using jose : USD sudo jose jwk thp -i /var/db/tang/<public_key>.jwk Replace <public_key> with the public exchange key for the Tang server. Example thumbprint 1gYTN_LpU9ZMB35yn5IbADY5OQ0 Optional: In the Cluster details step of the user interface wizard, choose to enable Tang encryption on either the control plane nodes, workers, or both. You will be required to enter URLs and thumbprints for the Tang servers. Optional: Using the API, follow the "Modifying hosts" procedure. Refresh the API token: USD source refresh-token Set the disk_encryption.enable_on setting to all , masters , or workers . Set the disk_encryption.mode setting to tang . Set disk_encyrption.tang_servers to provide the URL and thumbprint details about one or more Tang servers: USD curl https://api.openshift.com/api/assisted-install/v2/clusters/USD{CLUSTER_ID} \ -X PATCH \ -H "Authorization: Bearer USD{API_TOKEN}" \ -H "Content-Type: application/json" \ -d ' { "disk_encryption": { "enable_on": "all", "mode": "tang", "tang_servers": "[{\"url\":\"http://tang.example.com:7500\",\"thumbprint\":\"PLjNyRdGw03zlRoGjQYMahSZGu9\"},{\"url\":\"http://tang2.example.com:7500\",\"thumbprint\":\"XYjNyRdGw03zlRoGjQYMahSZGu3\"}]" } } ' | jq Valid settings for enable_on are all , master , worker , or none . Within the tang_servers value, comment out the quotes within the object(s). 5.3. Additional resources Modifying hosts

Commands:
source refresh-token
curl https://api.openshift.com/api/assisted-install/v2/clusters/USD{CLUSTER_ID} -X PATCH -H "Authorization: Bearer USD{API_TOKEN}" -H "Content-Type: application/json" -d ' { "disk_encryption": { "enable_on": "none", "mode": "tpmv2" } } ' | jq
tang-show-keys <port>
1gYTN_LpU9ZMB35yn5IbADY5OQ0
sudo dnf install jose
sudo jose jwk thp -i /var/db/tang/<public_key>.jwk
1gYTN_LpU9ZMB35yn5IbADY5OQ0
source refresh-token
curl https://api.openshift.com/api/assisted-install/v2/clusters/USD{CLUSTER_ID} -X PATCH -H "Authorization: Bearer USD{API_TOKEN}" -H "Content-Type: application/json" -d ' { "disk_encryption": { "enable_on": "all", "mode": "tang", "tang_servers": "[{\"url\":\"http://tang.example.com:7500\",\"thumbprint\":\"PLjNyRdGw03zlRoGjQYMahSZGu9\"},{\"url\":\"http://tang2.example.com:7500\",\"thumbprint\":\"XYjNyRdGw03zlRoGjQYMahSZGu3\"}]" } } ' | jq