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Getting Started with MicroShift

Refer to the MicroShift product documentation for how to install MicroShift on a machine running RHEL and how to build a RHEL for Edge image embedding MicroShift. If you do not yet have a RHEL subscription, you can get a no-cost Red Hat Developer subscription.

The remainder of this document describes an opinionated, non-production setup to facilitate experimentation with MicroShift in a virtual machine running the RHEL 9.4 operating system.

Prerequisites

Run the following command to install the necessary components for the libvirt virtualization platform and its QEMU KVM hypervisor driver.

Note for Other Virtualization Platform Users
Implement the virtual machine creation guidelines from Bootstrap MicroShift using your virtualization platform and apply one of the following configuration steps:

  • When creating a virtual machine, pass the inst.ks=... boot option pointing to the microshift-starter.ks kickstart file
  • After creating a virtual machine, manually execute the configuration steps from the microshift-starter.ks kickstart file
sudo dnf install -y libvirt virt-manager virt-install virt-viewer libvirt-client qemu-kvm qemu-img

Download the Red Hat Enterprise Linux 9.4 DVD ISO image for the x86_64 or aarch64 architectures from Red Hat Developer site, scroll down to see the 9.4 option.

Copy the ISO file to the /var/lib/libvirt/images directory.

Other architectures, versions or flavors of operating systems are not supported in this opinionated environment. For this setup, only use the RHEL 9.4 DVD image for the x86_64 or aarch64 architectures.

Download the OpenShift pull secret from the https://console.redhat.com/openshift/downloads#tool-pull-secret page and save it into the ~/.pull-secret.json file.

Bootstrap MicroShift

Run the following commands to initiate the creation process of the microshift-starter virtual machine with 2 CPU cores, 3GB RAM and 20GB storage.

VMNAME=microshift-starter
DVDISO="/var/lib/libvirt/images/rhel-9.4-$(uname -m)-dvd.iso"
KICKSTART=https://raw.githubusercontent.com/openshift/microshift/main/docs/config/microshift-starter.ks

sudo virt-install \
    --name "${VMNAME}" \
    --vcpus 2 \
    --memory 3072 \
    --disk "path=/var/lib/libvirt/images/${VMNAME}.qcow2,size=20" \
    --network network=default,model=virtio \
    --events on_reboot=restart \
    --location "${DVDISO}" \
    --extra-args "inst.ks=${KICKSTART}" \
    --noautoconsole \
    --wait

The OS console is accessible from the virt-manager application, which can be run using the sudo virt-manager command. Watch the OS console of the virtual machine to see the progress of the installation, waiting until the machine is rebooted and the login prompt appears.

Access MicroShift

From the OS console of the virtual machine, it is possible to log into the machine using redhat:redhat credentials.

However, it is most convenient to access the MicroShift virtual machine using SSH. First, get the machine IP address with the following command.

sudo virsh domifaddr microshift-starter

Copy your pull secret file to the MicroShift virtual machine using redhat:redhat credentials.

USHIFT_IP=192.168.122.2
scp ~/.pull-secret.json redhat@${USHIFT_IP}:

Log into the MicroShift virtual machine using redhat:redhat credentials.

ssh redhat@${USHIFT_IP}

The remaining commands are to be executed from within the virtual machine as the redhat user.

Register your RHEL machine and attach your subscriptions.

sudo subscription-manager register --auto-attach

Enable the MicroShift RPM repos and install MicroShift and the oc and kubectl clients.

sudo subscription-manager repos \
    --enable rhocp-4.16-for-rhel-9-$(uname -m)-rpms \
    --enable fast-datapath-for-rhel-9-$(uname -m)-rpms
sudo dnf install -y microshift openshift-clients

Confgure the minimum required firewall rules.

sudo firewall-cmd --permanent --zone=trusted --add-source=10.42.0.0/16
sudo firewall-cmd --permanent --zone=trusted --add-source=169.254.169.1
sudo firewall-cmd --reload

Configure CRI-O to use the pull secret.

sudo cp ~redhat/.pull-secret.json /etc/crio/openshift-pull-secret

Start the MicroShift service.

sudo systemctl enable --now microshift.service

Proceed by configuring MicroShift access for the redhat user account.

mkdir ~/.kube
sudo cat /var/lib/microshift/resources/kubeadmin/kubeconfig > ~/.kube/config

Finally, check if all the MicroShift pods are up and running by executing the oc command.

When started for the first time, it may take a few minutes to download and initialize the container images used by MicroShift. On subsequent restarts, all the MicroShift services should take a few seconds to become available.

oc get pods -A