Splunk® Enterprise

Installation Manual

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System requirements

Before you download and install the Splunk software, read this topic to learn which computing environments Splunk supports. If you have ideas or requests for new features to add to future releases, get in touch with Splunk Support. You can also follow our product road map.

Refer to the download page for the latest version to download. Check the release notes for details on known and resolved issues.

For a discussion of hardware planning for deployment, review "Hardware capacity planning for your Splunk deployment" in this manual.

Supported OSes

Splunk supports installation on the following platforms:

Unix operating systems

Operating system Architecture Enterprise / Trial Universal Forwarder
Solaris 8*, 9, 10, and 11* x86 (64-bit) x* x*
x86 (32-bit) x* x*
Linux, 3.0+ x86 (64-bit) x x
x86 (32-bit) x x
Linux, 2.6+ x86 (64-bit) x x
x86 (32-bit) x x
Linux, 2.4+ with Native POSIX Thread Library x86 (64-bit)
x86 (32-bit) x x
FreeBSD 7** and 8 x86 (64-bit) x x
x86 (32-bit) x x
Mac OS X 10.5 and 10.6 Universal x x
Intel x x
Mac OS X 10.7 and 10.8 Universal
Intel x x
AIX 5.3, 6.1, and 7.1 PowerPC x x
HP/UX† 11i v2 and 11i v3 Itanium x x

* Solaris 8 does not support 64-bit Splunk installs on Intel x86 architecture. Also, Solaris 11 does not support 32-bit Splunk installs on any architecture.
** Be sure to read important notes on FreeBSD 7 below.
† You must use gnu tar to unpack the HP/UX installation archive.

Windows operating systems

Be sure to read important notes about all Windows operating systems below.

Operating system Architecture Enterprise / Trial Universal Forwarder
Windows Server 2003 and Server 2003 R2 x86 (64-bit) x x
x86 (32-bit) x*** x***
Windows Server 2008 and Server 2008 R2© x86 (64-bit) x x
x86 (32-bit) x*** x***
Windows Server 2012 x86 (64-bit) x x
Windows XP, Windows Vista, and Windows 7 x86 (64-bit) x x
x86 (32-bit) x*** x***
Windows 8 x86 (64-bit) x x
x86 (32-bit) x*** x***

© There is no 32-bit version of Windows Server 2008 R2.
*** This version of Splunk is supported but is not recommended on this platform.

Operating system notes and additional information


Certain parts of Splunk on Windows require elevated user permissions to function properly. For additional information about what is required, read the following topics:

FreeBSD 7.x

To run Splunk 5.x on 32-bit FreeBSD 7.x, install the compat6x libraries. Splunk Support will supply "best effort" support for users running on FreeBSD 7.x. For more information, refer to "Install Splunk on FreeBSD 7" in the Community Wiki.

Deprecated operating systems and features

As we continue to version the Splunk product, we gradually deprecate support of older operating systems. Be sure to read "Deprecated features" in the Release Notes for information on which platforms and features have been deprecated or removed entirely.

Creating and editing configuration files on non-UTF-8 OSes

Splunk expects configuration files to be in ASCII/UTF-8 format. If you edit or create a configuration file on an OS that is non-UTF-8, you must ensure that the editor you are using is configured to save in ASCII/UTF-8.

IPv6 platform support

All Splunk-supported OS platforms are supported for use with IPv6 configurations except for the following:

  • AIX
  • HP/UX on PA-RISC architecture
  • Solaris 9

Refer to "Configure Splunk for IPv6" in the Admin Manual for details on Splunk IPv6 support.

Supported browsers

  • Firefox 3.6, 10.x, and latest
  • Internet Explorer 6, 7, 8, 9, and 10
  • Safari (latest)
  • Chrome (latest)

You should also make sure you have the latest version of Flash installed to render any charts that use options not supported by the JSChart module. For more information about this subject, see "About JSChart" in the Splunk Data Visualizations Manual.

Recommended hardware

Splunk is a high-performance application. If you are performing a comprehensive evaluation of Splunk for production deployment, we recommend that you use hardware typical of your production environment. This hardware should meet or exceed the recommended hardware capacity specifications below.

For a discussion of hardware planning for production deployment, see "Hardware capacity planning for your Splunk deployment" in this manual.

Splunk and virtual machines

If you run Splunk in a virtual machine (VM) on any platform, performance will degrade. This is because virtualization works by abstracting the hardware on a system into resource pools from which VMs defined on the system draw as needed. Splunk needs sustained access to a number of resources, particularly disk I/O, for indexing operations. Running Splunk in a VM or alongside other VMs can cause reduced indexing performance.

Recommended and minimum hardware capacity

Platform Recommended hardware capacity/configuration Minimum supported hardware capacity
Non-Windows platforms 2x quad-core Intel Xeon, 3 GHz, 8 GB RAM, Redundant Array of Independent Disks (RAID) 0 or 1+0, with a 64 bit OS installed. 1x1.4 GHz CPU, 1 GB RAM
Windows platforms 2x quad-core Intel Xeon, 3 GHz, 8 GB RAM, RAID 0 or 1+0, with a 64 bit OS installed. Pentium 4 or equivalent at 2 GHz, 2 GB RAM

Note: RAID 0 configurations do not provide fault-tolerance. Be certain that a RAID 0 configuration meets your data reliability needs before deploying a Splunk indexer on a system configured with RAID 0.

  • All configurations other than universal and light forwarder instances require at least the recommended hardware configuration.
  • The minimum supported hardware guidelines are designed for personal use of Splunk. The requirements for Splunk in a production environment are significantly higher.

Important: For all installations, including forwarders, you must have a minimum of 2 GB of hard disk space available in addition to the space required for any indexes. Refer to "Estimate your storage requirements" in this manual for additional information.

Hardware requirements for universal and light forwarders

Recommended Dual-core 1.5 GHz+ processor, 1 GB+ RAM
Minimum 1.0 Ghz processor, 512 MB RAM

Supported file systems

Platform File systems
Linux ext2/3/4, reiser3, XFS, NFS 3/4
Solaris UFS, ZFS, VXFS, NFS 3/4
Mac OS X HFS, NFS 3/4
Windows NTFS, FAT32

Note: If you run Splunk on a filesystem that is not listed above, Splunk might run a startup utility named locktest to test the viability of a filesystem for running Splunk. Locktest is a program that tests the start up process. If locktest runs and fails, then the filesystem is not suitable for running Splunk.

Considerations regarding File Descriptors (FDs)

Splunk Enterprise allocates system-wide resources like file descriptors and user processes on *nix systems for monitoring, forwarding, deploying, searching, and other things. The ulimit command controls access to these resources which must be set to acceptable levels for Splunk Enterprise to function properly on *nix systems.

The more tasks your Splunk Enterprise instance performs, the more resources it needs. You should increase the ulimit values if you start to see your instance run into problems with low resource limits. See I get errors about ulimit in splunkd.log in the Troubleshooting Manual.

The following table shows the system-wide resources that the software uses. It provides the minimum recommended settings for these resources for instances that are not forwarders (such as indexers, search heads, cluster masters, license masters, deployment servers, and Monitoring Consoles (MC)).

System-wide Resource ulimit invocation Recommended min. value
Open files ulimit -n 8192
User processes ulimit -u 1024
Data segment size ulimit -d 1073741824

On hosts that run FreeBSD, you might need to increase the kernel parameters for default and maximum process stack size. The following table shows the parameters that must be present in /boot/loader.conf on the host.

System-wide Resource Kernel parameter Recommended value
Default process data size (soft limit) dfldsiz 2147483648
Maximum process data size (hard limit) maxdsiz 2147483648

This consideration is not applicable to Windows-based systems.

Considerations regarding Network File System (NFS)

When choosing to use Network File System (NFS) as a storage medium for Splunk indexing, it is important to consider all of the ramifications of file level storage.

Splunk strongly recommends that you use block level storage rather than file level storage for indexing your data.

In environments with reliable, very high-bandwidth low-latency links, or with vendors that provide high-availability, clustered network storage, NFS can be an appropriate choice. However, customers who plan to choose this strategy should work closely with their hardware vendor to confirm that the storage platform they choose performs to the desired specification in terms of both performance and data integrity.

If you choose to use NFS, note the following caveats:

  • Splunk does not support "soft" NFS mounts (mounts which cause a program attempting a file operation on the mount to report an error and continue in case of a failure).
  • Only "hard" NFS mounts - mounts where the client continues to attempt to contact the server in case of a failure) are reliable with Splunk.
  • Do not disable attribute caching. If you have other applications which require disabling or reducing attribute caching, then you must provide Splunk a separate mount with attribute caching enabled.
  • Do not use NFS mounts over a wide area network (WAN). Doing so causes performance issues and can potentially lead to data loss.

Considerations regarding solid state drives (SSD)

SSDs deliver significant performance gains over conventional hard drives for Splunk in "rare" searches - searches that request small sets of results over large swaths of data - when used in combination with bloom filters. They also deliver performance gains with concurrent searches overall.

Supported server hardware architectures

32 and 64-bit architectures are supported for some platforms. See the download page for details.

Installation overview
Components of a Splunk deployment

This documentation applies to the following versions of Splunk® Enterprise: 5.0.2, 5.0.3, 5.0.4, 5.0.5, 5.0.6, 5.0.7, 5.0.8, 5.0.9, 5.0.10, 5.0.11, 5.0.12, 5.0.13, 5.0.14, 5.0.15, 5.0.16, 5.0.17, 5.0.18


Hi RickGenesis,<br /><br />We generally do not recommend usage of Splunk on 32-bit Windows platforms mainly because of performance issues with regard to 32-bit Windows operating systems. This includes universal forwarder, as it is not immune to memory pressures created by the limits in memory accessibility by 32-bit Windows.<br /><br />Still, we support installation of Splunk on those systems and do not have plans to curtail such support at this time.

Malmoore, Splunker
May 14, 2013

Why is the universal forwarder not recommended for Windows 2003/2008 32bit, understand that the indexer is not recommended due to memory limits, but this should not be a concern for the forwarder.

May 13, 2013

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