Chapter 4. Migrating MicroShift from RHEL for Edge to image mode for RHEL

Prerequisites

• You have an existing RHEL for Edge deployment running MicroShift.
• You have root access to the build host.
• You have an image that you want to deploy.

Procedure

• Solve the potential UID or GID drift for the Open vSwitch (OVS) systemd service, ovsdb-server.service, by adding the following command to the MicroShift image-build procedure:

  # Install systemd configuration drop-ins to fix potential permission problems when upgrading from rpm-ostree commits to image mode container layers
  RUN mkdir -p /usr/lib/systemd/system/ovsdb-server.service.d && \
      cat > /usr/lib/systemd/system/ovsdb-server.service.d/microshift-ovsdb-ownership.conf <<'EOF'
  # The openvswitch database files must be owned by the appropriate user and its primary group. That the user and its group can be overwritten, recreate them.
  [Service]
  ExecStartPre=/bin/sh -c '/bin/getent passwd openvswitch >/dev/null || useradd -r openvswitch'
  ExecStartPre=/bin/sh -c '/bin/getent group hugetlbfs >/dev/null || groupadd -r hugetlbfs'
  ExecStartPre=/sbin/usermod -a -G hugetlbfs openvswitch
  ExecStartPre=/bin/chown -Rhv openvswitch. /etc/openvswitch
  EOF

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