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:
- v3.16.3 or later (rbd deadlock regression in v3.16.[0-2])
- NOT v3.15.* (rbd deadlock regression)
- v3.14.*
- v3.10.*
These are considered pretty old, but if you must:
- v3.6.6 or later in the v3.6 stable series
- v3.4.20 or later in the v3.4 stable series
firefly (CRUSH_TUNABLES3) tunables are supported starting with v3.15. See CRUSH Tunables for more details.
btrfs
If you use the btrfs file system with Ceph, we recommend using a recent Linux kernel (v3.14 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 |
|---|---|---|---|---|---|
| CentOS | 6 | N/A | linux-2.6.32 | 1, 2 | B, I |
| CentOS | 7 | linux-3.10.0 | B | ||
| Debian | 6.0 | Squeeze | linux-2.6.32 | 1, 2, 3 | B |
| Debian | 7.0 | Wheezy | linux-3.2.0 | 1, 2 | B |
| Fedora | 19 | Schrödinger’s Cat | linux-3.10.0 | B | |
| Fedora | 20 | Heisenbug | linux-3.14.0 | B | |
| RHEL | 6 | linux-2.6.32 | 1, 2 | B, I, C | |
| RHEL | 7 | linux-3.10.0 | B, I, C | ||
| 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 |
NOTE: Ceph also supports Quantal, Raring and Saucy. However, we recommend using LTS releases.
Emperor (0.72)¶
The Ceph Emperor release, version 0.72, is no longer supported, and Emperor users should update to Firefly (version 0.80).
Dumpling (0.67)¶
| Distro | Release | Code Name | Kernel | Notes | Testing |
|---|---|---|---|---|---|
| CentOS | 6.3 | N/A | linux-2.6.32 | 1, 2 | B, I |
| Debian | 6.0 | Squeeze | linux-2.6.32 | 1, 2, 3 | B |
| Debian | 7.0 | Wheezy | linux-3.2.0 | 1, 2 | B |
| Fedora | 18 | Spherical Cow | linux-3.6.0 | B | |
| Fedora | 19 | Schrödinger’s Cat | linux-3.10.0 | B | |
| OpenSuse | 12.2 | N/A | linux-3.4.0 | 2 | B |
| RHEL | 6.3 | linux-2.6.32 | 1, 2 | B, I | |
| 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 |
Argonaut (0.48), Bobtail (0.56), and Cuttlefish (0.61)¶
The Ceph Argonaut, Bobtail, and Cuttlefish releases are no longer supported, and users should update to the latest stable release (Dumpling or Firefly).
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 build release packages for this platform. For some of these platforms, we may also continuously build all ceph branches and exercise 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.
