Release Notes and Known Issues

Red Hat CodeReady Containers 1.31

Highlighted features and identified problems in CodeReady Containers 1.31

Red Hat Developer Group Documentation Team


This document lists and briefly describes new and improved features of CodeReady Containers 1.31. It also contains information about potential problems you may encounter while using the software. Where possible, workarounds are described for identified issues.

Making open source more inclusive

Red Hat is committed to replacing problematic language in our code, documentation, and web properties. We are beginning with these four terms: master, slave, blacklist, and whitelist. Because of the enormity of this endeavor, these changes will be implemented gradually over several upcoming releases. For more details, see our CTO Chris Wright’s message.

Part I. Release notes

This section documents the most important features and bug fixes in the CodeReady Containers 1.31 product.

Chapter 1. Component versions

CodeReady Containers 1.31 is shipped with the following versions of the main components:

Table 1.1. CodeReady Containers, Component versions


OpenShift Container Platform


OpenShift client binary (oc)


Chapter 2. Minimum system requirements

CodeReady Containers has the following minimum hardware and operating system requirements.

2.1. Hardware requirements

CodeReady Containers requires the following system resources:

  • 4 physical CPU cores
  • 9 GB of free memory
  • 35 GB of storage space

The OpenShift cluster requires these minimum resources to run in the CodeReady Containers virtual machine. Some workloads may require more resources. To assign more resources to the CodeReady Containers virtual machine, see Configuring the virtual machine.

2.2. Operating system requirements

CodeReady Containers requires the following minimum version of a supported operating system:

2.2.1. Microsoft Windows

  • On Microsoft Windows, CodeReady Containers requires the Windows 10 Fall Creators Update (version 1709) or newer. CodeReady Containers does not work on earlier versions of Microsoft Windows. Microsoft Windows 10 Home Edition is not supported.

2.2.2. macOS

  • On macOS, CodeReady Containers requires macOS 10.14 Mojave or newer. CodeReady Containers does not work on earlier versions of macOS.

2.2.3. Linux

  • On Linux, CodeReady Containers is only supported on Red Hat Enterprise Linux/CentOS 7.5 or newer (including 8.x versions) and on the latest two stable Fedora releases.
  • When using Red Hat Enterprise Linux, the machine running CodeReady Containers must be registered with the Red Hat Customer Portal.
  • Ubuntu 18.04 LTS or newer and Debian 10 or newer are not officially supported and may require manual set up of the host machine.
  • See Required software packages to install the required packages for your Linux distribution.

Chapter 3. Changes and improvements

This section highlights some of the notable changes introduced in CodeReady Containers 1.31.

3.1. New features

  • CodeReady Containers brings a minimal, preconfigured OpenShift Container Platform 4 cluster to your local laptop or desktop computer for development and testing purposes. CodeReady Containers is delivered as a Red Hat Enterprise Linux virtual machine that supports native hypervisors for Linux, macOS, and Microsoft Windows 10.

    • CodeReady Containers is designed for local development and testing on an OpenShift 4 cluster. To run an OpenShift 3 cluster locally, see Red Hat Container Development Kit.

3.1.1. Technology Previews

Support for these features falls under the Technology Preview Features Support Scope.

  • CodeReady Containers 1.31 includes the ability to create a custom bundle based on the currently running cluster with the crc bundle generate command. This command, its parameters, and behavior may change in incompatible ways in future releases.

3.2. Notable changes

  • CodeReady Containers 1.31 provides OpenShift Container Platform 4.8.4 as the embedded OpenShift version.
  • On Linux, CodeReady Containers now uses systemd socket activation to start the CodeReady Containers daemon when needed.

Part II. Known issues

This section describes issues that users of CodeReady Containers 1.31 may encounter, as well as possible workarounds for these issues.

Chapter 4. General issues

Issues affecting all supported platforms.

4.1. Increased startup time for the OpenShift Container Platform 4.7 cluster

Due to an upstream issue, the cluster embedded in CodeReady Containers will take longer than usual to start using the crc start command.

For more information about the issue, see BZ#1927263: kubelet service takes around 43 secs to start container when started from stopped state.

4.2. Metrics are disabled by default

To ensure CodeReady Containers can run on a typical laptop, some resource-heavy services are disabled by default. One of these services is Prometheus and all of the related monitoring, alerting, and telemetry functionality.

Enabling these features will require more resources than the CodeReady Containers virtual machine uses by default.


Monitoring cannot be disabled after enabling these features. To disable monitoring again, delete the virtual machine with crc delete and recreate a new one with crc start.

See Starting Monitoring, Alerting, and Telemetry in the Red Hat CodeReady Containers Getting Started Guide to enable monitoring.

4.3. Enabling multiple Operators requires more memory than the default

The crc start command assigns 9 GiB of memory to the CodeReady Containers virtual machine by default. Enabling multiple Operators may increase memory requirements.

See Configuring the virtual machine in the Red Hat CodeReady Containers Getting Started Guide to assign additional memory.

4.4. CodeReady Containers does not work when the first nameserver is IPv6

DNS resolution to the CodeReady Containers virtual machine can be disrupted if the first nameserver is IPv6.

To work around this issue, specify an IPv4 nameserver when starting the CodeReady Containers virtual machine using the -n flag:

$ crc start -n

Chapter 5. Issues on macOS

This section describes CodeReady Containers issues that affect users on a macOS host.

5.1. Hibernation causes VM time to desynchronize

Time in the CodeReady Containers virtual machine can become desynchronized with the time on your host machine. This issue occurs if the CodeReady Containers virtual machine is running when the host machine enters hibernation. To resolve this issue, stop the CodeReady Containers virtual machine and restart it:

$ crc stop
$ crc start

Chapter 6. Issues on Microsoft Windows

This section describes CodeReady Containers issues that affect users on a Microsoft Windows host.

6.1. The crc setup command must be run following installation with the MSI installer

After installing CodeReady Containers with the MSI installer and rebooting your computer, ensure you run the crc setup command in Command Prompt or PowerShell to complete the installation.

6.2. The crc cleanup command may fail with a permission error

Running crc setup followed by crc cleanup without restarting your host machine between commands will cause crc cleanup to report the following error:

Post "http://unix/clean": open \\.\pipe\crc-admin-helper: Access is denied.

To complete the crc cleanup command, restart your host machine and run the command again.

6.3. Unexpected behavior when run outside of %WINDRIVE%

The Hyper-V driver will fail when the crc binary is executed from a network drive. The crc binary must be placed in a location on %WINDRIVE%. %WINDRIVE% is normally set to C:\.

6.4. CodeReady Containers expects FullLanguage support in PowerShell

The ConstrainedLanguage PowerShell mode is supported with exceptions determined by your system administrator.

6.5. The crc oc-env command does not work with special characters in %PATH%

On Microsoft Windows, PowerShell and Command Prompt do not use the UTF-8 encoding. As a result, running the crc oc-env command with special characters present in the %PATH% will not accurately encode UTF-8 characters. There is no known workaround for this issue.

Additional resources

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