In ceph-10.2.6, the ceph init script uses systemd-run to launch
ceph-mon and ceph-osd services. This generates transient systemd
service files with basic configuration. On node shutdown, ceph is
getting shutdown while it is still in use by containers, and without
unmapping the RBD devices, causing the libceph kernel module to
hang trying to communicate with the ceph monitor.
This update patches the ceph init script to generate systemd
overrides config files for the ceph-mon and ceph-osd that provide
improved ordering during shutdown, as well as a script to run
as part of the docker.service shutdown (by packaging a systemd
override) to unmap the RBD devices. This ordering ensures kubelet
and docker services are shutdown first, then the RBD devices are
cleaned up, followed by the shutdown of the ceph services and
service management (SM). Once kubelet and docker have shut down,
the ceph-preshutdown.sh script is able to cleanly unmount and
unmap the RBD devices and unload the rbd and libceph
kernel modules.
In ceph-11.0.1, the use of systemd-run was replaced with proper
systemd service configuration files. Once ceph is upgraded for
StarlingX, the ordering and cleanup will need to be revisited.
Story: 2004520
Task: 28258
Change-Id: I6f7d7b9e704121c54211afd86b38df015b8d7a63
Signed-off-by: Don Penney <don.penney@windriver.com>
a883e82866