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163 lines
7.0 KiB
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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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We currently recommend:
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- v3.16.3 or later (rbd deadlock regression in v3.16.[0-2])
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- *NOT* v3.15.* (rbd deadlock regression)
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- v3.14.*
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- v3.10.*
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These are considered pretty old, but if you must:
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- v3.6.6 or later in the v3.6 stable series
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- v3.4.20 or later in the v3.4 stable series
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firefly (CRUSH_TUNABLES3) tunables are supported starting with v3.15.
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See `CRUSH Tunables`_ for more details.
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- **btrfs**
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If you use the ``btrfs`` file system with Ceph, we recommend using a
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recent Linux kernel (v3.14 or later).
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glibc
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-----
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- **fdatasync(2)**: With Firefly v0.80 and beyond, use ``fdatasync(2)``
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instead of ``fsync(2)`` to improve performance.
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- **syncfs(2)**: For non-btrfs filesystems
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such as XFS and ext4 where more than one ``ceph-osd`` daemon is used on a
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single server, Ceph performs significantly better with the ``syncfs(2)``
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system call (added in kernel 2.6.39 and glibc 2.14). New versions of
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Ceph (v0.55 and later) do not depend on glibc support.
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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 aside from the kernel and system initialization
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package (i.e., sysvinit, upstart, systemd).
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Firefly (0.80)
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--------------
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+----------+----------+--------------------+--------------+---------+------------+
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| Distro | Release | Code Name | Kernel | Notes | Testing |
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+==========+==========+====================+==============+=========+============+
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| CentOS | 6 | N/A | linux-2.6.32 | 1, 2 | B, I |
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+----------+----------+--------------------+--------------+---------+------------+
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| CentOS | 7 | | linux-3.10.0 | | B |
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+----------+----------+--------------------+--------------+---------+------------+
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| Debian | 6.0 | Squeeze | linux-2.6.32 | 1, 2, 3 | B |
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+----------+----------+--------------------+--------------+---------+------------+
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| Debian | 7.0 | Wheezy | linux-3.2.0 | 1, 2 | B |
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+----------+----------+--------------------+--------------+---------+------------+
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| Fedora | 19 | Schrödinger's Cat | linux-3.10.0 | | B |
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+----------+----------+--------------------+--------------+---------+------------+
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| Fedora | 20 | Heisenbug | linux-3.14.0 | | B |
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+----------+----------+--------------------+--------------+---------+------------+
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| RHEL | 6 | | linux-2.6.32 | 1, 2 | B, I, C |
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+----------+----------+--------------------+--------------+---------+------------+
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| RHEL | 7 | | linux-3.10.0 | | B, I, C |
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+----------+----------+--------------------+--------------+---------+------------+
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| Ubuntu | 12.04 | Precise Pangolin | linux-3.2.0 | 1, 2 | B, I, C |
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+----------+----------+--------------------+--------------+---------+------------+
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| Ubuntu | 14.04 | Trusty Tahr | linux-3.13.0 | | B, I, C |
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+----------+----------+--------------------+--------------+---------+------------+
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**NOTE**: Ceph also supports ``Quantal``, ``Raring`` and ``Saucy``. However, we
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recommend using LTS releases.
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Emperor (0.72)
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---------------
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The Ceph Emperor release, version 0.72, is no longer supported, and Emperor users should update to Firefly (version 0.80).
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Dumpling (0.67)
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---------------
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+----------+----------+--------------------+--------------+---------+------------+
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| Distro | Release | Code Name | Kernel | Notes | Testing |
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+==========+==========+====================+==============+=========+============+
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| CentOS | 6.3 | N/A | linux-2.6.32 | 1, 2 | B, I |
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+----------+----------+--------------------+--------------+---------+------------+
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| Debian | 6.0 | Squeeze | linux-2.6.32 | 1, 2, 3 | B |
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+----------+----------+--------------------+--------------+---------+------------+
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| Debian | 7.0 | Wheezy | linux-3.2.0 | 1, 2 | B |
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+----------+----------+--------------------+--------------+---------+------------+
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| Fedora | 18 | Spherical Cow | linux-3.6.0 | | B |
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+----------+----------+--------------------+--------------+---------+------------+
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| Fedora | 19 | Schrödinger's Cat | linux-3.10.0 | | B |
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+----------+----------+--------------------+--------------+---------+------------+
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| OpenSuse | 12.2 | N/A | linux-3.4.0 | 2 | B |
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+----------+----------+--------------------+--------------+---------+------------+
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| RHEL | 6.3 | | linux-2.6.32 | 1, 2 | B, I |
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+----------+----------+--------------------+--------------+---------+------------+
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| Ubuntu | 12.04 | Precise Pangolin | linux-3.2.0 | 1, 2 | B, I, C |
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+----------+----------+--------------------+--------------+---------+------------+
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| Ubuntu | 12.10 | Quantal Quetzal | linux-3.5.4 | 2 | B |
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+----------+----------+--------------------+--------------+---------+------------+
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| Ubuntu | 13.04 | Raring Ringtail | linux-3.8.5 | | B |
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+----------+----------+--------------------+--------------+---------+------------+
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Argonaut (0.48), Bobtail (0.56), and Cuttlefish (0.61)
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------------------------------------------------------
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The Ceph Argonaut, Bobtail, and Cuttlefish releases are no longer supported,
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and users should update to the latest stable release (Dumpling or Firefly).
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Notes
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-----
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- **1**: The default kernel has an older version of ``btrfs`` that we do not
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recommend for ``ceph-osd`` storage nodes. Upgrade to a recommended
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kernel or use ``XFS`` or ``ext4``.
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- **2**: The default kernel has an old Ceph client that we do not recommend
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for kernel client (kernel RBD or the Ceph file system). Upgrade to a
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recommended kernel.
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- **3**: The default kernel or installed version of ``glibc`` does not
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support the ``syncfs(2)`` system call. Putting multiple
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``ceph-osd`` daemons using ``XFS`` or ``ext4`` on the same host will
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not perform as well as they could.
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Testing
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-------
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- **B**: We build release packages for this platform. For some of these
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platforms, we may also continuously build all ceph branches and exercise
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basic unit tests.
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- **I**: We do basic installation and functionality tests of releases on this
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platform.
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- **C**: We run a comprehensive functional, regression, and stress test suite
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on this platform on a continuous basis. This includes development branches,
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pre-release, and released code.
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.. _CRUSH Tunables: ../../rados/operations/crush-map#tunables
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