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Minimum system requirements
  • Operating System:
       Linux(x86_64): kernel 2.6 and above
       FreeBSD(x86_64): 8.0 and above

  • CPU:
       Intel: 80486 and above
       Sun: UltraSPARC and above
       PowerPC: PowerPC G4

  • Memory:
       32MB and above

  • Disk:
       Installation: 10MB
       Runtime: 20MB and above, swapping space depends on usage

Installation Steps

Installation must be performed in a command line terminal. For testing purpose, LiteSpeed Load Balancer can be installed into your home directory as a non-privileged user. For production use, it should be installed into a system directory. Under Mac OS X, root user is disabled by default; it can be enabled by using the NetInfo Manager Application in /Applications/Utilities folder. If you don't want to enable root user, you can use "sudo" to install LiteSpeed Load Balancer into a system directory as well.

  1. decompress the package into a convenient location:
    tar xvfz lslb-xxxx.tar.gz or gunzip -c lslb-xxxx.tar.gz | tar xvf -

  2. Install license key or serial number.
    • Install trial license. Trial license is for evaluation purpose and is only good for around 30 days. It will be sent to you in the confirmation email if you request to evaluate our product. Please copy trial.key to the installation directory.
      If you are switching from a trial license to a formal license, please follow the steps below to get your permanent license key and run installer again to update your license.

    • Our production licensing procedure is:
      1. Each production license is assigned with one serial number.
      2. The serial number(s) will be sent to you as attachment in the confirmation email after you order has been successfully processed.
      3. A license key request should be generated by the Installer based on the serial number and your server's hardware signatures.
      4. After we receive the request, a permanent production license key will be assigned and sent to you.

      Please be aware that the license key is associated with the serial number and the server's hardware signature. A new key is required if changes of hardware signature is detected. We will update your license key for a small license migration fee.
      For users without the production license key, the serial number (named as should be copied to the installation directory before starting the Installer.
      If the production license key is available, please also copy it (should be named as license.key) to the installation directory.

  3. Go to the installation directory cd lslb-xxxx and run command ./
    "root" user can install the server into a system directory; non-root user should install it to somewhere under his home directory.
    Mac OS X user can install the server into a system directory with command sudo ./

  4. Read the End User License Agreement and type "Yes" to confirm your agreement.

  5. Generate license request.
    If the Installer only finds serial number but no valid license key, it will prompt to generate a license request. The installer will exit after generating the request.
    The generated request lic_req.bin should be e-mailed to This email address is being protected from spambots. You need JavaScript enabled to view it.. A new license key will be sent back to you in email shortly after we receive you request, please save it to the installation directory and run the Installer again.

    Note: Installation will continue only if there is a valid/trial license.

  6. Follow the instructions on the screen.
    The following questions will be asked:
    1. User and group that the server process run on behalf of.
    2. Destination directory where the server should be installed.
    3. If an installed copy exists, choose either Update or Reinstall.
      Update will keep your current configuration.
    4. Administrator's username and password for the administration web interface.
    5. TCP port for normal web service.
    6. TCP port for web administration interface.
    7. "root" user has option to enable "chroot". The installer will setup the initial chroot environment automatically. We strongly recommend not enabling it unless you are familiar with "chroot". You can always enable it later with an upgrade installation.
    "root" user can also choose to run LiteSpeed Load Balancer as a service which starts automatically at system startup.
    Server can be started by the installer once it is installed successfully.

Testing Installation
  1. There are a couple of ways to control the server process. For detail information please see Administration Guide. To start the server, simply run [your_install_dir]/bin/lslbctrl start.

  2. If the default port for normal web service was not changed during installation, point your browser to http://[address]:8090/, otherwise replace "8090" with actual port used. "[address]" should be the IP address or domain name of Load Balancer machine. Use "localhost" if it is accessed from the same machine. Load Balancer will try to route request to a default LiteSpeed Web Server installation on localhost, port 8088, if it does not work, try next step.

  3. If the default port for web administration interface is not changed during installation, point your browser to http://[address]:7090/, otherwise replace "7090" with actual port used. "[Address]" should be the IP address or domain name of your load balancer machine. Use "localhost" if it is accessed from the same machine.
    The welcome page of administration interface should be loaded, click "Log on" link and use the administrator's username and password specified during installation to log on. For detailed information regarding configuration, please refer to our Configuration Guide, or click "help" link on top of each page.

  4. If your server uses firewall, please make sure that localhost is trusted. For instance, Linux with IPTables should include a rule ALLOW INPUT from LO.

  5. If the web administration interface is inaccessible either, please take a look at the error log - [your_install_dir]/logs/error.log
    • If it is because of TCP port confliction with other server applications, the load balancer should be reinstalled with an available port.
      The following command can be used to find an available port:
      netstat -an | grep XXXX
      XXXX is the port number. If the port is available, no output should be produced.

    • If it is because swapping directory is not writable, you can either grant write permission of swapping directory to the user whom the web server running as, or change the swapping directory manually.
      The swapping directory is configured in the server's XML configuration file located at [your_install_dir]/conf/lslbd_config.xml, default value is /tmp/lslbd/swap. Search for <swappingDir>.
If you still have problem with installation, please post your problem on our support Forum.


There are a few scenarios that you need to update the server software or license.

  • A new release is available
  • Upgrade from a trial license to production license
  • Upgrade production license from N CPU to M CPU license.

To upgrade to another release, just run again and select 'upgrade', your current configuration will be kept.
The built-in update agent will check new release periodically and automatically download new package and send email notification about the new release. Server upgrade can be performed via the web admin interface by clicking the upgrade link in the version management page.

For license upgrade, you can manually copy "" and "license.key" to [your_install_dir]/conf/ directory then restart, it is recommended to backup your old license key first.

Version Management
  • Multiple versions of LiteSpeed Load Balancer can be installed and easily switched from one to another by using the version management utility provided [your_install_dir]/admin/misc/
    • To switch to version A, for example 1.0, just run [your_install_dir_current_version]/admin/misc/ 1.0
    • To remove previous installed files for version A, for example 1.0, just run [your_install_dir_current_version]/admin/misc/ -d 1.0
  • Version management is also available from WebAdmin interface under "Service Manager - Server - Version Management". It will list all the installed versions and available new releases. You can install new release or switch between different versions by just a click.
Uninstallation Steps
  1. Simply run [your_install_dir]/admin/misc/ and follow the instructions on the screen.

  2. The following questions will be asked:
    • whether to keep the log directory
    • whether to keep the configuration directory

  3. All the directories that are not created by the Installer will not be touched, even they are under [your_install_dir]. But all the files created by the installer will be removed.

  4. [your_install_dir] will be removed as well if it is empty.

Privacy Policy

Privacy Policy

LiteSpeed Technologies, Inc. (aka “LiteSpeed”) is committed to protecting your privacy. This policy ("Privacy Policy" or "Policy") explains our practices for our site, ("Site"). You can visit most pages of the Site without giving us any information about yourself, but sometimes we do need information to provide services that you request. By using this Site or any products or services provided through the Site, you expressly consent to the use and disclosure of information as described in this Privacy Policy.

LiteSpeed reserves the right to revise, modify, add, or remove provisions to this Privacy Policy at any time. If we make changes to this Privacy Policy, we will update the Effective Date to note the date of such changes. LiteSpeed encourages you to review this Privacy Policy periodically for any changes. IF YOU DO NOT AGREE WITH ANY OF THE TERMS BELOW, YOU SHOULD NOT USE THIS SITE OR THE PRODUCTS OR SERVICES OFFERED BY LITESPEED TECHNOLOGIES AT THIS SITE.

Collection of Information

Personal Information.

LiteSpeed will ask you for certain “Personal Information” when you complete registration or product information request forms on the Site, including but not limited to your name, address, telephone number, email address, and credit card information. You can always choose not to provide us with the requested information, however, you may not be able to complete the transaction or use our products or services if you do not provide the information requested.

Non-Personal Information.

LiteSpeed may collect non-personally identifiable information from you such as the type of browser you use, your operating system, the screen resolution of your browser, your ISP, your IP address, which pages you view on the Site and the time and duration of your visits to the Site (collectively, “Non-Personal Information”). LiteSpeed may associate Non-Personal Information with Personal Information if you register with the Site.

User Communications.

If you communicate with us, we may collect information relating to that communication whether it takes the form of email, fax, letter, forum posting, blog comments, testimonials or any other form of communication between you and LiteSpeed or Submitted by you to the Site (collectively, “User Communications”).

Server Information.

If you use one of our software products such as LiteSpeed Web Server or LiteSpeed Web ADC, we may collect certain information concerning such software and concerning the server upon which the software operates. This information includes: (a) the licensed or unlicensed status of the software; (b) the source from which the license for the software was obtained (i.e., LiteSpeed or a LiteSpeed affiliate); or (c) information about the server upon which the software is installed including (i) the public IP address, (ii) the operating system and (iii) the use of any virtualization technologies on such server ((a) through (c) collectively, “Server Information”). Additionally, “Server Information” may also include information collected from you by LiteSpeed in the event that you request technical support services including without limitation, IP addresses, usernames, and passwords necessary to login to SSH, the root directory of the server upon which you installed the LiteSpeed software and any affected accounts including email accounts, control panel accounts, MySQL accounts, CMS accounts and other accounts.

Use and Storage of Collected Information

LiteSpeed may use Personal Information to create and authenticate your account, to respond to your requests, to provide you with customer and technical support, or to provide you with information regarding our products, services, partners, and company. You may update your Personal Information with us at any time, but we may maintain records of any Personal Information you disclose to us indefinitely, unless otherwise requested as outlined below.

We may use User Communications in the same ways we use Personal Information. If you communicate with us for a particular purpose, we may use your User Communications for that purpose. For example, if you contact us for technical support, we may use your communications to provide technical support to you. We may maintain records of User Communications you transmit to us indefinitely, unless otherwise requested as outlined below.

LiteSpeed may use Non-Personal Information to maintain, evaluate, improve and provide our Site, the Services and any other LiteSpeed products and services. We may retain Non-Personal Information indefinitely.

We may use Server Information to provide you with technical support services and to maintain, evaluate, improve and provide LiteSpeed products and services. We may also use such information to investigate unlicensed (and therefore unauthorized) uses of our software. LiteSpeed may maintain Server Information indefinitely, with the exception of usernames, passwords, and other login information given in connection with support service requests. Such login information will be purged when the ticket is closed.

Disclosure of Collected Information

LiteSpeed will only disclose Personal Information to third parties if acting under a good faith belief that such action is necessary, including but not limited to: (a) to resolve disputes, investigate problems, or comply with laws or regulations; (b) to enforce our Terms of Service; (c) to protect and defend the rights, property, or safety of our company or our users; or (d) in the event of a merger, acquisition or sale of all or substantially all LiteSpeed assets. Other than this limited activity, we do not share, sell, or rent any personal information to third parties.

You will receive notice in the form of modifications to this Policy when information about you might go to third parties other than as described in this Policy, and you always have the opportunity to contact us as set forth below if you do not wish your information to go to third parties.

LiteSpeed cannot be responsible for protecting your information if you share such information in publicly available sections of the Site such as the user forums, blog comments, or testimonials section. You should use your own judgment in disclosing this information on the Site.

Use of Cookies

“Cookies” are small pieces of information that your browser stores on your computer on behalf of a website that you have visited. Cookies may be used in order to complete transactions on our site. You can always choose not to accept cookies with the settings of your web browser, however, you may not be able to complete these transactions if you do not accept cookies.

Security of Personal Information

We use reasonable security methods to protect your personal information from unauthorized access, use or disclosure. No data transmission over the Internet or any wireless network can be guaranteed to be perfectly secure. While we try to protect your personal information, we cannot guarantee the security of any information you transmit to us, and you do so at your own risk.

LiteSpeed uses industry-standard SSL-encryption to protect sensitive data.

In the event that LiteSpeed becomes aware of a security breach, unauthorized disclosure or inadvertent disclosure concerning your information, you agree that LiteSpeed may notify you of such an event using the Personal Information previously provided.

You are responsible for maintaining your account’s security.

GDPR Statement

LiteSpeed Technologies values your users’ privacy. Although our software does not directly collect any personally identifiable information from visitors to your site, LiteSpeed may still be considered a data processor, as user information may be temporarily cached and/or logged, as outlined in this document.


LiteSpeed Web Server, OpenLiteSpeed, LiteSpeed Web ADC, and related software may record IP addresses as a part of normal logging. An access log and an error log may record visitor IP addresses and URL visited. The logs are stored locally on the system where LiteSpeed server software is installed and are not transferred to or accessed by LiteSpeed employees in any way, except as necessary in providing routine technical support if you request it. This logging may be turned off through configuration. It is up to individual server administrators to come up with their own schedule for removing such logs from the file system.

Cache Solutions

Our cache plugins potentially store a duplicate copy of every web page on display on your site. The pages are stored locally on the system where LiteSpeed server software is installed and are not transferred to or accessed by LiteSpeed employees in any way, except as necessary in providing routine technical support if you request it. All cache files are temporary, and may easily be purged before their natural expiration, if necessary, via a Purge All command. It is up to individual site administrators to come up with their own cache expiration rules.

LSCache for WordPress

In addition to caching, our WordPress plugin has an Image Optimization feature. When optimization is requested, images are transmitted to a remote LiteSpeed server, processed, and then transmitted back for use on your site. LiteSpeed keeps copies of optimized images for 7 days (in case of network stability issues) and then permanently deletes them.

Similarly, the WordPress plugin has a Reporting feature whereby a site owner can transmit an environment report to our server so that we may better provide technical support.

Neither of these features collects any visitor data. Only server and site data is involved.

Support Services

Sometimes, when you request technical support, LiteSpeed may ask for login credentials to various areas of your site. You may refuse to share such credentials, however refusal may impact LiteSpeed’s ability to provide the requested support services.

Upon completion of a support ticket, LiteSpeed immediately deletes all login credentials you may have shared.

Any user data encountered by LiteSpeed is kept strictly confidential. We never provide your support ticket information to any third party without your explicit consent.

Contact Us

If you would like to update information that you have voluntarily provided to us, stop receiving information from us, or exercise any of the rights granted to you under Privacy Laws, including the EU’s General Data Protection Regulation, please e-mail