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Prerequisites for RHACS on Red Hat OpenShift - Installing RHACS on Red Hat OpenShift | Installing | Red Hat Advanced Cluster Security for Kubernetes 4.0
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Prerequisites for RHACS on Red Hat OpenShift

Before you install RHACS for OpenShift Container Platform or another OCP-compatible supported Kubernetes platform, ensure you have met the prerequisites.

General requirements

RHACS has some system requirements that must be met before installing.

You must not install Red Hat Advanced Cluster Security for Kubernetes on:

  • Amazon Elastic File System (Amazon EFS). Use the Amazon Elastic Block Store (Amazon EBS) with the default gp2 volume type instead.

  • Older CPUs that do not have the Streaming SIMD Extensions (SSE) 4.2 instruction set. For example, Intel processors older than Sandy Bridge and AMD processors older than Bulldozer. (These processors were released in 2011.)

To install Red Hat Advanced Cluster Security for Kubernetes, you must have:

  • OpenShift Container Platform version 4.10 or later. For more information about supported self-managed and managed OpenShift Container Platform versions, see Red Hat Advanced Cluster Security for Kubernetes Support Policy.

  • Cluster nodes with a supported operating system:

    • Red Hat Enterprise Linux CoreOS (RHCOS), Red Hat Enterprise Linux (RHEL).

    • Processor and memory: 2 CPU cores and at least 3GiB of RAM.

      For deploying Central, use a machine type with four or more cores and apply scheduling policies to launch Central on such nodes.

    • Architectures: AMD64, ppc64le, or s390x.

      For ppc64le, or s390x architectures, you can only install RHACS Secured cluster services on IBM Power, IBM zSystems, and IBM® LinuxONE clusters. Central is not supported at this time.

  • Persistent storage by using persistent volume claim (PVC).

    You must not use Ceph FS storage with Red Hat Advanced Cluster Security for Kubernetes. Red Hat recommends using RBD block mode PVCs for Red Hat Advanced Cluster Security for Kubernetes.

    • Use Solid-State Drives (SSDs) for best performance. However, you can use another storage type if you do not have SSDs available.

To install using helm charts:

  • You must have helm command-line interface (CLI) v3.2 or newer, if you are installing or configuring Red Hat Advanced Cluster Security for Kubernetes using helm charts. Use the helm version command to verify the version of helm you have installed.

  • The Red Hat OpenShift CLI (oc).

  • You must have access to the Red Hat Container Registry. For information about downloading images from registry.redhat.io, see Red Hat Container Registry Authentication.

Prerequisites for installing Central

A containerized service called Central handles API interactions and user interface (Portal) access while a containerized service called Central DB (PostgreSQL 13) handles data persistence.

Both Central and Central DB require persistent storage:

  • You can provide storage with a persistent volume claim (PVC).

    You can use a hostPath volume for storage only if all your hosts (or a group of hosts) mount a shared file system, such as an NFS share or a storage appliance. Otherwise, your data is only saved on a single node. Red Hat does not recommend using a hostPath volume.

  • Use Solid-State Drives (SSD) for best performance. However, you can use another storage type if you do not have SSDs available.

  • If you use a web proxy or firewall, you must configure bypass rules to allow traffic for the definitions.stackrox.io and collector-modules.stackrox.io domains and enable Red Hat Advanced Cluster Security for Kubernetes to trust your web proxy or firewall. Otherwise, updates for vulnerability definitions and kernel support packages will fail.

    Red Hat Advanced Cluster Security for Kubernetes requires access to:

    • definitions.stackrox.io for downloading updated vulnerability definitions. Vulnerability definition updates allow Red Hat Advanced Cluster Security for Kubernetes to maintain up-to-date vulnerability data when new vulnerabilities are discovered or additional data sources are added.

    • collector-modules.stackrox.io to download updated kernel support packages. Updated Kernel support packages ensure that Red Hat Advanced Cluster Security for Kubernetes can monitor the latest operating systems and collect data about the network traffic and processes running inside the containers. Without these updates, Red Hat Advanced Cluster Security for Kubernetes might fail to monitor containers if you add new nodes in your cluster or if you update your nodes' operating system.

For security reasons, you should deploy Central in a cluster with limited administrative access.

Memory and storage requirements

The following table lists the minimum memory and storage values required to install and run Central.

Central CPU Memory Storage

Request

1.5 cores

4 GiB

100 GiB

Limit

4 cores

8 GiB

100 GiB
Central DB CPU Memory Storage

Request

4 cores

8 GiB

100 GiB

Limit

8 cores

16 GiB

100 GiB

Sizing guidelines

Use the following compute resources and storage values depending upon the number of nodes in your cluster.

Nodes Deployments Central CPU Central Memory Central Storage

Up to 100

Up to 1000

2 cores

4 GiB

100 GiB

Up to 500

Up to 2000

4 cores

8 GiB

100 GiB

More than 500

More than 2000

8 cores

12 - 16 GiB

100 - 200 GiB
Nodes Deployments Central DB CPU Central DB Memory Central DB Storage

Up to 100

Up to 1000

2 cores

4 GiB

100 GiB

Up to 500

Up to 2000

4 cores

8 GiB

100 GiB

More than 500

More than 2000

8 cores

12 - 16 GiB

100 - 200 GiB

Prerequisites for installing Scanner

Red Hat Advanced Cluster Security for Kubernetes includes an image vulnerability scanner called Scanner. This service scans images that are not already scanned by scanners integrated into image registries.

Memory and storage requirements

Scanner CPU Memory

Request

1.2 cores

2700 MiB

Limit

5 cores

8000 MiB

Prerequisites for installing Sensor

Sensor monitors your Kubernetes and OpenShift Container Platform clusters. These services currently deploy in a single deployment, which handles interactions with the Kubernetes API and coordinates with Collector.

Memory and storage requirements

Sensor CPU Memory

Request

2 cores

4 GiB

Limit

4 cores

8 GiB

Prerequisites for installing Admission controller

The Admission controller prevents users from creating workloads that violate policies you configure.

Memory and storage requirements

By default, the admission control service runs 3 replicas. The following table lists the request and limits for each replica.

Admission controller CPU Memory

Request

.05 cores

100 MiB

Limit

.5 cores

500 MiB

Prerequisites for installing Collector

Collector monitors runtime activity on each node in your secured clusters. It connects to Sensor to report this information.

To install Collector on systems that have Unified Extensible Firmware Interface (UEFI) and that have Secure Boot enabled, you must use eBPF probes because kernel modules are unsigned, and the UEFI firmware cannot load unsigned packages. Collector identifies Secure Boot status at the start and switches to eBPF probes if required.

Memory and storage requirements

Collector CPU Memory

Request

.05 cores

320 MiB

Limit

.75 cores

1 GiB

Collector uses a mutable image tag (<version>-latest), so you get support for newer Linux kernel versions more easily. There is no change in code, pre-existing kernel modules, or eBPF programs for image updates. Updates only add a single image layer with support for new kernel versions published after the initial release.