29.2. FIPS support in components that the cluster uses

To ensure that the secrets that are stored in etcd use FIPS Validated / Modules in Process encryption, boot the node in FIPS mode. After you install the cluster in FIPS mode, you can encrypt the etcd data by using the FIPS-approved aes cbc cryptographic algorithm.

For local storage, use RHEL-provided disk encryption or Container Native Storage that uses RHEL-provided disk encryption. By storing all data in volumes that use RHEL-provided disk encryption and enabling FIPS mode for your cluster, both data at rest and data in motion, or network data, are protected by FIPS Validated / Modules in Process encryption. You can configure your cluster to encrypt the root filesystem of each node, as described in Customizing nodes.

To ensure that containers know that they are running on a host that is using FIPS Validated / Modules in Process cryptography modules, use CRI-O to manage your runtimes. CRI-O supports FIPS mode, in that it configures the containers to know that they are running in FIPS mode.