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The Knative (kn) CLI does not have its own login mechanism. To log in to the cluster, you must install the OpenShift (oc) CLI and use the oc login command. Installation options for the CLIs may vary depending on your operating system.

For more information on installing the OpenShift (oc) CLI for your operating system and logging in with oc, see the OpenShift CLI getting started documentation.

OpenShift Serverless cannot be installed using the Knative (kn) CLI. A cluster administrator must install the OpenShift Serverless Operator and set up the Knative components, as described in the Installing the OpenShift Serverless Operator documentation.

If you try to use an older version of the Knative (kn) CLI with a newer OpenShift Serverless release, the API is not found and an error occurs.

For example, if you use the 1.16.0 release of the Knative (kn) CLI, which uses version 0.22.0, with the 1.17.0 OpenShift Serverless release, which uses the 0.23.0 versions of the Knative Serving and Knative Eventing APIs, the CLI does not work because it continues to look for the outdated 0.22.0 API versions.

Ensure that you are using the latest Knative (kn) CLI version for your OpenShift Serverless release to avoid issues.

Installing the Knative CLI using the OpenShift Container Platform web console

Using the OpenShift Container Platform web console provides a streamlined and intuitive user interface to install the Knative (kn) CLI. After the OpenShift Serverless Operator is installed, you will see a link to download the Knative (kn) CLI for Linux (amd64, s390x, ppc64le), macOS, or Windows from the Command Line Tools page in the OpenShift Container Platform web console.

Prerequisites
  • You have logged in to the OpenShift Container Platform web console.

  • The OpenShift Serverless Operator is installed on your OpenShift Container Platform cluster.

    If libc is not available, you might see the following error when you run CLI commands:

    $ kn: No such file or directory
Procedure
  1. Download the Knative (kn) CLI from the Command Line Tools page. You can access the Command Line Tools page by clicking the question circle icon in the top right corner of the web console and selecting Command Line Tools in the list.

  2. Unpack the archive:

    $ tar -xf <file>
  3. Move the kn binary to a directory on your PATH.

  4. To check your PATH, run:

    $ echo $PATH

Installing the Knative CLI for Linux by using an RPM package manager

For Red Hat Enterprise Linux (RHEL), you can install the Knative (kn) CLI as an RPM by using a package manager, such as yum or dnf. This allows the Knative CLI version to be automatically managed by the system. For example, using a command like dnf upgrade upgrades all packages, including kn, if a new version is available.

Prerequisites
  • You have an active OpenShift Container Platform subscription on your Red Hat account.

Procedure
  1. Register with Red Hat Subscription Manager:

    # subscription-manager register
  2. Pull the latest subscription data:

    # subscription-manager refresh
  3. Attach the subscription to the registered system:

    # subscription-manager attach --pool=<pool_id> (1)
    1 Pool ID for an active OpenShift Container Platform subscription
  4. Enable the repositories required by the Knative (kn) CLI:

    • Linux (x86_64, amd64)

      # subscription-manager repos --enable="openshift-serverless-1-for-rhel-8-x86_64-rpms"
    • Linux on IBM Z and LinuxONE (s390x)

      # subscription-manager repos --enable="openshift-serverless-1-for-rhel-8-s390x-rpms"
    • Linux on IBM Power (ppc64le)

      # subscription-manager repos --enable="openshift-serverless-1-for-rhel-8-ppc64le-rpms"
  5. Install the Knative (kn) CLI as an RPM by using a package manager:

    Example yum command
    # yum install openshift-serverless-clients

Installing the Knative CLI for Linux

If you are using a Linux distribution that does not have RPM or another package manager installed, you can install the Knative (kn) CLI as a binary file. To do this, you must download and unpack a tar.gz archive and add the binary to a directory on your PATH.

Prerequisites
  • If you are not using RHEL or Fedora, ensure that libc is installed in a directory on your library path.

    If libc is not available, you might see the following error when you run CLI commands:

    $ kn: No such file or directory
Procedure
  1. Download the relevant Knative (kn) CLI tar.gz archive:

  2. Unpack the archive:

    $ tar -xf <filename>
  3. Move the kn binary to a directory on your PATH.

  4. To check your PATH, run:

    $ echo $PATH

Installing the Knative CLI for macOS

If you are using macOS, you can install the Knative (kn) CLI as a binary file. To do this, you must download and unpack a tar.gz archive and add the binary to a directory on your PATH.

Procedure
  1. Download the Knative (kn) CLI tar.gz archive.

  2. Unpack and extract the archive.

  3. Move the kn binary to a directory on your PATH.

  4. To check your PATH, open a terminal window and run:

    $ echo $PATH

Installing the Knative CLI for Windows

If you are using Windows, you can install the Knative (kn) CLI as a binary file. To do this, you must download and unpack a ZIP archive and add the binary to a directory on your PATH.

Procedure
  1. Download the Knative (kn) CLI ZIP archive.

  2. Extract the archive with a ZIP program.

  3. Move the kn binary to a directory on your PATH.

  4. To check your PATH, open the command prompt and run the command:

    C:\> path