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travisn 7548e76bab Increase the number of mons when nodes are added 
The desired number of mons could change depending on the number of nodes in a cluster.
For example, three mons would be the min number of mons in a production cluster with at
least three nodes. If there are five or more nodes, the number of mons could increase
to five in order to increase the failure tolerance to two nodes.

This is accomplished by a new setting in the cluster CRD preferredCount. If the number
of hosts exceeds preferredCount, more mons are added to quorum. If the number
of hosts drops below the preferred count, the operator would reduce the quorum size to
the smaller desired count.

Signed-off-by: travisn <tnielsen@redhat.com>
2019-03-19 13:00:37 -06:00

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Major Themes

Action Required

Notable Features

Minio Object Stores

- Now have an additional label named `objectstore` with the name of the Object Store, to allow better selection for Services.
- Use `Readiness` and `Liveness` probes.
- Updated automatically on Object Store CRD changes.

Ceph

  • A CephNFS CRD will start NFS daemon(s) for exporting CephFS volumes or RGW buckets. See the NFS documentation.
  • Selinux labeling for mounts can now be toggled with the ROOK_ENABLE_SELINUX_RELABELING environment variable.
  • Recursive chown for mounts can now be toggled with the ROOK_ENABLE_FSGROUP environment variable.
  • Added the dashboard port configuration setting.
  • Added the dashboard ssl configuration setting.
  • Added Ceph CSI driver deployments on Kubernetes 1.13 and above.
  • The number of mons can be increased automatically when new nodes come online. See the preferredCount setting in the cluster CRD documentation.
  • New Kubernetes nodes or nodes which are not tainted NoSchedule anymore get added automatically to the existing rook cluster if useAllNodes is set. Issue #2208

Breaking Changes

  • Rook no longer supports Kubernetes 1.8 and 1.9.
  • Rook no longer supports running more than one monitor on the same node when hostNetwork and allowMultiplePerNode are true.
  • Rook Operator switches from Extensions v1beta1 to use Apps v1 API for DaemonSet and Deployment.

Ceph

  • Rook will no longer create a directory-based osd in the dataDirHostPath if no directories or devices are specified or if there are no disks on the host.
  • Containers in mon, mgr, mds, rgw, and rbd-mirror pods have been removed and/or changed names.
  • Config paths in mon, mgr, mds and rgw containers are now always under /etc/ceph or /var/lib/ceph and as close to Ceph's default path as possible regardless of the dataDirHostPath setting.
  • The rbd-mirror pod labels now read rbd-mirror instead of rbdmirror for consistency.

Known Issues

Deprecations

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