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Helm Charts for Ceph

This originally was a fork of https://github.com/openstack/openstack-helm containing only the Ceph related charts.
(These charts have now been moved to https://github.com/openstack/openstack-helm-infra by the Openstack-Helm people.) Since then some things have diverged considerably. Notable differences at the time of writing (11/09/2019):

  • Based on Ceph Nautilus
  • Uses a Kubernetes operator for the OSDs
  • Uses ceph-volume and only supports BlueStore
  • Uses CentOS 7 based images from the ceph-container project
  • ceph-config-helper image is based on ceph/daemon-base
  • Use of Ceph's new centralized configuration management
  • Update of CephFS and RBD provisioners (RBD provisioner supports additional RBD image features)
  • Removal of local registry/repository sync and Keystone support
  • Unified values.yaml

Links

Releases

  • milestone-1: This version was running in production for several month and includes Ceph Mimic (13.2.6) in its last incarnation.

  • milestone-2: This is major update of the Helm charts and it contains some not backwards compatible changes in values.yaml. Notable changes are:

    • Adds security contexts to most pods and tries to minimize the needed privileges by mounting container images read-only, running as nobody among other things. (Adapted in large parts from openstack-helm-infra.)
    • DaemonSet's and Deployment's update strategy can now be configure via values.yaml. (Adapted in large parts from openstack-helm-infra.)
    • Ceph configuration changes (conf.ceph in values.yaml) are now not only applied when creating the Ceph cluster but also to the running cluster. Only additions and changes are supported. Deletions still have to be done by hand.
    • It is now possible to configure additional storage classes and to configure a storage class as the default. But there currently is the limitation that the client key installation is only done for the standard RBD storage class rbd.
    • Fixed balancer default configuration to use mode crush-compat instead of the newer upmap. KRBD clients are still at Jewel feature level in Linux Kernel 4.19 and so the balancer never did anything. For existing clusters this will start shuffling some data around. If this is not desired I suggest to set ceph_mgr_modules_config.balancer.active to 0. This disables automatic balancing.
    • Changing S3 admin key and secret via values.yaml is now supported. (Also ported from openstack-helm-infra.)

  • milestone-3: This is a major update and brings Ceph to version 14.2.2.

    • Updates ceph-container to 4.0.3 which includes Ceph 14.2.2.
    • Health check scripts are rewritten (includes an important bug fix to the mon check script)
    • Fixed probably endless loop in wait_for_inactive_pgs due to changed ceph pg ls output.
    • Enabled messenger v2 protocol for all components
    • Updated locking logic for OSD block devices, Nautilus does the locking internally now
    • Updated ceph-config-helper image: Ceph to 14.2.2 and kubectl to 1.15.3

    Remember to execute osd require-osd-release nautilus after the upgrade is complete and you're confident that you don't want to go back.

  • milestone-4: This updates the Ceph OSD operator.

    • Update to Operator SDK 0.10.0

    The Ceph OSD operator update changes the name of the custom resource definition as it was using the singular form by mistake. So before upgrading the chart two additional steps are needed:

    # Delete the old CRD
kubectl delete crd cephosd.ceph.elemental.net
# Install the new CRD
kubectl create -f ceph-with-helm/ceph-osd/templates/ceph_v1alpha1_cephosd_crd.yaml

    This will temporarily delete any existing CephOSD custom resources and so all OSD pods. OSD data is not affected and safe. The custom resources will need to be reinstalled either by upgrading the ceph-osd chart or by other means if they reside outside of the chart. After the new operator is operational it will recreate all OSD pods. It is advisable to mark all OSDs as noout for the time of the upgrade to prevent any unwanted data shuffling.

  • milestone-5: This is major update and brings Ceph to version 15 (Octopus)

    • Updates ceph-container to 5.0.11 which includes Ceph 15.2.12.
    • Updates cephfs-provisioner and rbd-provisioner to 0.8.0. This update was needed so that the provisioners will work with Kubernetes 1.20..
    • Adapts Python scripts to work with Pyhton 3.
    • Adds an option to deploy the Ceph dashboard.
    • Changes the structure of the keyring secrets. Old keyring secrets will be migrated to the new format but are still compatible with the old format. To finalize the migration the script tools/scripts/finalize-keyring-migration is provided. After running the script the secrets are no longer compatible with the old format.
    • Adds two new secrets which are by default named ceph-csi-rbd and ceph-csi-cephfs. These secrets can be referenced by Ceph CSI compatible storage classes. The Ceph CSI deployments for RBD and CephFS need to be implemented outside of ceph-with-helm for example with the official Helm charts of the Ceph CSI project. Support for legacy (i.e. non-CSI-based) volumes will be removed in a future version.
    • Migrates the installed Ingress resources from API version networking.k8s.io/v1beta1 to networking.k8s.io/v1.