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Add KRBD feature flag support note to doc/start/os-recommendations.rst. This change was suggested by Anthony D'Atri in https://github.com/ceph/ceph/pull/51485. Co-authored-by: Ilya Dryomov <idryomov@redhat.com> Co-authored-by: Anthony D'Atri <anthony.datri@gmail.com> Signed-off-by: Zac Dover <zac.dover@proton.me>
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65 lines
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====================
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OS Recommendations
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====================
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Ceph Dependencies
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=================
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As a general rule, we recommend deploying Ceph on newer releases of Linux.
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We also recommend deploying on releases with long-term support.
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Linux Kernel
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------------
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- **Ceph Kernel Client**
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If you are using the kernel client to map RBD block devices or mount
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CephFS, the general advice is to use a "stable" or "longterm
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maintenance" kernel series provided by either http://kernel.org or
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your Linux distribution on any client hosts.
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For RBD, if you choose to *track* long-term kernels, we recommend
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*at least* 4.19-based "longterm maintenance" kernel series. If you can
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use a newer "stable" or "longterm maintenance" kernel series, do it.
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For CephFS, see the section about `Mounting CephFS using Kernel Driver`_
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for kernel version guidance.
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Older kernel client versions may not support your `CRUSH tunables`_ profile
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or other newer features of the Ceph cluster, requiring the storage cluster to
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be configured with those features disabled. For RBD, a kernel of version 5.3
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or CentOS 8.2 is the minimum necessary for reasonable support for RBD image
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features.
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Platforms
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=========
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The charts below show how Ceph's requirements map onto various Linux
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platforms. Generally speaking, there is very little dependence on
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specific distributions outside of the kernel and system initialization
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package (i.e., sysvinit, systemd).
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+--------------+--------+------------------------+--------------------------------+-------------------+-----------------+
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| Release Name | Tag | CentOS | Ubuntu | OpenSUSE :sup:`C` | Debian :sup:`C` |
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+==============+========+========================+================================+===================+=================+
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| Quincy | 17.2.z | 8 :sup:`A` | 20.04 :sup:`A` | 15.3 | 11 |
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+--------------+--------+------------------------+--------------------------------+-------------------+-----------------+
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| Pacific | 16.2.z | 8 :sup:`A` | 18.04 :sup:`C`, 20.04 :sup:`A` | 15.2 | 10, 11 |
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+--------------+--------+------------------------+--------------------------------+-------------------+-----------------+
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| Octopus | 15.2.z | 7 :sup:`B` 8 :sup:`A` | 18.04 :sup:`C`, 20.04 :sup:`A` | 15.2 | 10 |
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+--------------+--------+------------------------+--------------------------------+-------------------+-----------------+
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- **A**: Ceph provides packages and has done comprehensive tests on the software in them.
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- **B**: Ceph provides packages and has done basic tests on the software in them.
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- **C**: Ceph provides packages only. No tests have been done on these releases.
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.. note::
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**For Centos 7 Users**
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``Btrfs`` is no longer tested on Centos 7 in the Octopus release. We recommend using ``bluestore`` instead.
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.. _CRUSH Tunables: ../../rados/operations/crush-map#tunables
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.. _Mounting CephFS using Kernel Driver: ../../cephfs/mount-using-kernel-driver#which-kernel-version
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