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OS Recommendations

Ceph Dependencies

As a general rule, we recommend deploying Ceph on newer releases of Linux. We also recommend deploying on releases with long-term support.

Linux Kernel

  • Ceph Kernel Client

    If you are using the kernel client to map RBD block devices or mount CephFS, the general advice is to use a "stable" or "longterm maintenance" kernel series provided by either http://kernel.org or your Linux distribution on any client hosts.

    For RBD, if you choose to track long-term kernels, we currently recommend 4.x-based "longterm maintenance" kernel series or later:

    • 4.19.z
    • 4.14.z
    • 5.x

    For CephFS, see the section about Mounting CephFS using Kernel Driver for kernel version guidance.

    Older kernel client versions may not support your CRUSH tunables profile or other newer features of the Ceph cluster, requiring the storage cluster to be configured with those features disabled.

Platforms

The charts below show how Ceph's requirements map onto various Linux platforms. Generally speaking, there is very little dependence on specific distributions aside from the kernel and system initialization package (i.e., sysvinit, systemd).

Octopus (15.2.z)

Distro Release Code Name Kernel Notes Testing
CentOS 8 N/A linux-4.18   B, I, C
CentOS 7 N/A linux-3.10.0 4, 5 B, I
Debian 10 Buster linux-4.19   B
RHEL 8 Ootpa linux-4.18   B, I, C
RHEL 7 Maipo linux-3.10.0   B, I
Ubuntu 18.04 Bionic Beaver linux-4.15 4 B, I, C
openSUSE 15.2 Leap linux-5.3 6  
openSUSE   Tumbleweed      

Notes

  • 1: The default kernel has an older version of Btrfs that we do not recommend for ceph-osd storage nodes. We recommend using BlueStore starting with Luminous, and XFS for previous releases with Filestore.
  • 2: The default kernel has an old Ceph client that we do not recommend for kernel client (kernel RBD or the Ceph file system). Upgrade to a recommended kernel.
  • 3: The default kernel regularly fails in QA when the Btrfs file system is used. We recommend using BlueStore starting from Luminous, and XFS for previous releases with Filestore.
  • 4: btrfs is no longer tested on this release. We recommend using bluestore.
  • 5: Some additional features related to dashboard are not available.
  • 6: Packages are built regularly, but not distributed by upstream Ceph.

Testing

  • B: We build release packages for this platform. For some of these platforms, we may also continuously build all Ceph branches and perform basic unit tests.
  • I: We do basic installation and functionality tests of releases on this platform.
  • C: We run a comprehensive functional, regression, and stress test suite on this platform on a continuous basis. This includes development branches, pre-release, and released code.