Commits on Aug 24, 2023

1. Implement workaround to allow SNO installations for OKD/FCOS …

   OKD/FCOS uses FCOS as its bootimage, i.e. when booting cluster nodes
   the first time during installation. FCOS does not provide tools such
   as OpenShift Client (oc) or hyperkube which are used during
   single-node cluster installation at first boot (e.g. oc in
   bootkube.sh [0]). RHCOS and SCOS include these tools, but FCOS has to
   pivot the root fs [1] to okd-machine-os [2] first in order to make
   those tools available.
   
   Pivoting uses 'rpm-ostree rebase' but during SNO installation the node
   will be booted from a FCOS Live ISO where the root fs and /sysroot are
   mounted read-only. Thus 'rpm-ostree rebase' fails and necessary tools
   for SNO installation will not be available, causing the setup to stall.
   
   This patch works around this issue by mounting /usr and /etc as
   overlay filesystems which contains both the content of the live iso as
   well as from the okd-machine-os container image.
   
   [0] https://github.com/openshift/installer/blob/master/data/data/bootstrap/files/usr/local/bin/bootkube.sh.template
   [1] https://github.com/openshift/installer/blob/master/data/data/bootstrap/files/usr/local/bin/bootstrap-pivot.sh.template
   [2] https://github.com/openshift/okd-machine-os

   

   JM1 committed Aug 24, 2023
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