ceph/doc/start/os-recommendations.rst

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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:** We currently recommend:
- v3.10.0 or later
- v3.6.6 or later in the v3.6 stable series
- v3.4.20 or later in the v3.4 stable series
- **btrfs**: If you use the ``btrfs`` file system with Ceph, we recommend using
a recent Linux kernel (v3.5 or later).
glibc
-----
- **fdatasync(2)**: With Firefly v0.80 and beyond, use ``fdatasync(2)``
instead of ``fsync(2)`` to improve performance.
- **syncfs(2)**: For non-btrfs filesystems
such as XFS and ext4 where more than one ``ceph-osd`` daemon is used on a
single server, Ceph performs significantly better with the ``syncfs(2)``
system call (added in kernel 2.6.39 and glibc 2.14). New versions of
Ceph (v0.55 and later) do not depend on glibc support.
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, upstart, systemd).
Firefly (0.80)
--------------
+----------+----------+--------------------+--------------+---------+------------+
| Distro | Release | Code Name | Kernel | Notes | Testing |
+==========+==========+====================+==============+=========+============+
| Ubuntu | 12.04 | Precise Pangolin | linux-3.2.0 | 1, 2 | B, I, C |
+----------+----------+--------------------+--------------+---------+------------+
| Ubuntu | 14.04 | Trusty Tahr | linux-3.13.0 | | B, I, C |
+----------+----------+--------------------+--------------+---------+------------+
| Debian | 6.0 | Squeeze | linux-2.6.32 | 1, 2, 3 | B |
+----------+----------+--------------------+--------------+---------+------------+
| Debian | 7.0 | Wheezy | linux-3.2.0 | 1, 2 | B |
+----------+----------+--------------------+--------------+---------+------------+
| CentOS | 6 | N/A | linux-2.6.32 | 1, 2 | B, I |
+----------+----------+--------------------+--------------+---------+------------+
| RHEL | 6 | | linux-2.6.32 | 1, 2 | B, I, C |
+----------+----------+--------------------+--------------+---------+------------+
| RHEL | 7 | | linux-3.10.0 | | B, I, C |
+----------+----------+--------------------+--------------+---------+------------+
| Fedora | 19.0 | Schrödinger's Cat | linux-3.10.0 | | B |
+----------+----------+--------------------+--------------+---------+------------+
| Fedora | 20.0 | Heisenbug | linux-3.14.0 | | B |
+----------+----------+--------------------+--------------+---------+------------+
**NOTE**: Ceph also supports ``Quantal``, ``Raring`` and ``Saucy``. However, we
recommend using LTS releases.
Emperor (0.72)
--------------
+----------+----------+--------------------+--------------+---------+------------+
| Distro | Release | Code Name | Kernel | Notes | Testing |
+==========+==========+====================+==============+=========+============+
| Ubuntu | 12.04 | Precise Pangolin | linux-3.2.0 | 1, 2 | B, I, C |
+----------+----------+--------------------+--------------+---------+------------+
| Ubuntu | 12.10 | Quantal Quetzal | linux-3.5.4 | 2 | B |
+----------+----------+--------------------+--------------+---------+------------+
| Ubuntu | 13.04 | Raring Ringtail | linux-3.8.5 | | B |
+----------+----------+--------------------+--------------+---------+------------+
| Debian | 6.0 | Squeeze | linux-2.6.32 | 1, 2, 3 | B |
+----------+----------+--------------------+--------------+---------+------------+
| Debian | 7.0 | Wheezy | linux-3.2.0 | 1, 2 | B |
+----------+----------+--------------------+--------------+---------+------------+
| CentOS | 6.3 | N/A | linux-2.6.32 | 1, 2 | B, I |
+----------+----------+--------------------+--------------+---------+------------+
| RHEL | 6.3 | | linux-2.6.32 | 1, 2 | B, I |
+----------+----------+--------------------+--------------+---------+------------+
| Fedora | 18.0 | Spherical Cow | linux-3.6.0 | | B |
+----------+----------+--------------------+--------------+---------+------------+
| Fedora | 19.0 | Schrödinger's Cat | linux-3.10.0 | | B |
+----------+----------+--------------------+--------------+---------+------------+
| OpenSuse | 12.2 | N/A | linux-3.4.0 | 2 | B |
+----------+----------+--------------------+--------------+---------+------------+
Dumpling (0.67)
---------------
+----------+----------+--------------------+--------------+---------+------------+
| Distro | Release | Code Name | Kernel | Notes | Testing |
+==========+==========+====================+==============+=========+============+
| Ubuntu | 12.04 | Precise Pangolin | linux-3.2.0 | 1, 2 | B, I, C |
+----------+----------+--------------------+--------------+---------+------------+
| Ubuntu | 12.10 | Quantal Quetzal | linux-3.5.4 | 2 | B |
+----------+----------+--------------------+--------------+---------+------------+
| Ubuntu | 13.04 | Raring Ringtail | linux-3.8.5 | | B |
+----------+----------+--------------------+--------------+---------+------------+
| Debian | 6.0 | Squeeze | linux-2.6.32 | 1, 2, 3 | B |
+----------+----------+--------------------+--------------+---------+------------+
| Debian | 7.0 | Wheezy | linux-3.2.0 | 1, 2 | B |
+----------+----------+--------------------+--------------+---------+------------+
| CentOS | 6.3 | N/A | linux-2.6.32 | 1, 2 | B, I |
+----------+----------+--------------------+--------------+---------+------------+
| RHEL | 6.3 | | linux-2.6.32 | 1, 2 | B, I |
+----------+----------+--------------------+--------------+---------+------------+
| Fedora | 18.0 | Spherical Cow | linux-3.6.0 | | B |
+----------+----------+--------------------+--------------+---------+------------+
| Fedora | 19.0 | Schrödinger's Cat | linux-3.10.0 | | B |
+----------+----------+--------------------+--------------+---------+------------+
| OpenSuse | 12.2 | N/A | linux-3.4.0 | 2 | B |
+----------+----------+--------------------+--------------+---------+------------+
Cuttlefish (0.61)
-----------------
+----------+----------+--------------------+--------------+---------+------------+
| Distro | Release | Code Name | Kernel | Notes | Testing |
+==========+==========+====================+==============+=========+============+
| Ubuntu | 12.04 | Precise Pangolin | linux-3.2.0 | 1, 2 | B, I, C |
+----------+----------+--------------------+--------------+---------+------------+
| Ubuntu | 12.10 | Quantal Quetzal | linux-3.5.4 | 2 | B |
+----------+----------+--------------------+--------------+---------+------------+
| Ubuntu | 13.04 | Raring Ringtail | linux-3.8.5 | | B |
+----------+----------+--------------------+--------------+---------+------------+
| Debian | 6.0 | Squeeze | linux-2.6.32 | 1, 2, 3 | B |
+----------+----------+--------------------+--------------+---------+------------+
| Debian | 7.0 | Wheezy | linux-3.2.0 | 1, 2 | B |
+----------+----------+--------------------+--------------+---------+------------+
| CentOS | 6.3 | N/A | linux-2.6.32 | 1, 2 | B, I |
+----------+----------+--------------------+--------------+---------+------------+
| RHEL | 6.3 | | linux-2.6.32 | 1, 2 | B, I |
+----------+----------+--------------------+--------------+---------+------------+
| Fedora | 17.0 | Beefy Miracle | linux-3.3.4 | 1, 2 | B |
+----------+----------+--------------------+--------------+---------+------------+
| Fedora | 18.0 | Spherical Cow | linux-3.6.0 | | B |
+----------+----------+--------------------+--------------+---------+------------+
| OpenSuse | 12.2 | N/A | linux-3.4.0 | 2 | B |
+----------+----------+--------------------+--------------+---------+------------+
Bobtail (0.56)
--------------
+----------+----------+--------------------+--------------+---------+------------+
| Distro | Release | Code Name | Kernel | Notes | Testing |
+==========+==========+====================+==============+=========+============+
| Ubuntu | 11.04 | Natty Narwhal | linux-2.6.38 | 1, 2, 3 | B |
+----------+----------+--------------------+--------------+---------+------------+
| Ubuntu | 11.10 | Oneric Ocelot | linux-3.0.0 | 1, 2 | B |
+----------+----------+--------------------+--------------+---------+------------+
| Ubuntu | 12.04 | Precise Pangolin | linux-3.2.0 | 1, 2 | B, I, C |
+----------+----------+--------------------+--------------+---------+------------+
| Ubuntu | 12.10 | Quantal Quetzal | linux-3.5.4 | 2 | B |
+----------+----------+--------------------+--------------+---------+------------+
| Debian | 6.0 | Squeeze | linux-2.6.32 | 1, 2, 3 | B |
+----------+----------+--------------------+--------------+---------+------------+
| Debian | 7.0 | Wheezy | linux-3.2.0 | 1, 2 | B |
+----------+----------+--------------------+--------------+---------+------------+
| CentOS | 6.3 | N/A | linux-2.6.32 | 1, 2 | B, I |
+----------+----------+--------------------+--------------+---------+------------+
| Fedora | 17.0 | Beefy Miracle | linux-3.3.4 | 1, 2 | B |
+----------+----------+--------------------+--------------+---------+------------+
| Fedora | 18.0 | Spherical Cow | linux-3.6.0 | | B |
+----------+----------+--------------------+--------------+---------+------------+
| OpenSuse | 12.2 | N/A | linux-3.4.0 | 2 | B |
+----------+----------+--------------------+--------------+---------+------------+
Argonaut (0.48)
---------------
+----------+----------+--------------------+--------------+---------+------------+
| Distro | Release | Code Name | Kernel | Notes | Testing |
+==========+==========+====================+==============+=========+============+
| Ubuntu | 11.04 | Natty Narwhal | linux-2.6.38 | 1, 2, 3 | B |
+----------+----------+--------------------+--------------+---------+------------+
| Ubuntu | 11.10 | Oneric Ocelot | linux-3.0.0 | 1, 2, 3 | B |
+----------+----------+--------------------+--------------+---------+------------+
| Ubuntu | 12.04 | Precise Pangolin | linux-3.2.0 | 1, 2 | B, I, C |
+----------+----------+--------------------+--------------+---------+------------+
| Ubuntu | 12.10 | Quantal Quetzal | linux-3.5.4 | 2 | B |
+----------+----------+--------------------+--------------+---------+------------+
| Debian | 6.0 | Squeeze | linux-2.6.32 | 1, 2, 3 | B |
+----------+----------+--------------------+--------------+---------+------------+
| Debian | 7.0 | Wheezy | linux-3.2.0 | 1, 2, 3 | B |
+----------+----------+--------------------+--------------+---------+------------+
Notes
-----
- **1**: The default kernel has an older version of ``btrfs`` that we do not
recommend for ``ceph-osd`` storage nodes. Upgrade to a recommended
kernel or use ``XFS`` or ``ext4``.
- **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 or installed version of ``glibc`` does not
support the ``syncfs(2)`` system call. Putting multiple
``ceph-osd`` daemons using ``XFS`` or ``ext4`` on the same host will
not perform as well as they could.
Testing
-------
- **B**: We continuously build all branches on this platform and exercise basic
unit tests. We build release packages for this platform.
- **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.