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Here are some basic concepts you should know before going into the detail of the configuration.

  • Cluster
  • A cluster is a group of backend servers that provide the same type of service. Each server is called a "cluster node", or just a "node". A load balancer will distribute requests to cluster nodes based on a set of rules. Usually, even distribution is preferred. A LiteSpeed Load Balancer can be used to service as many clusters as you want.

  • Virtual Host
  • LiteSpeed Load Balancer can be used to load balance for multiple web sites (virtual hosts) which sit on different clusters.

  • Listener
  • A listener in LiteSpeed Load Balancer is a server socket that listens on specific IP address and TCP port.

    For each listener, an IP address and a port number need to be specified. IP address can be any valid local IP address or the wild card IP that refers to all the available IP address on that machine. Port is an integer number between 0 and 65535. Official port for HTTP is 80, for HTTPS is 443. However, other ports can be used too. On UNIX machine, only super user "root" has permission to use ports below 1024.

    Only one listener is allowed for each IP and port combination. Thus if a listener is configured on one port with the wild card IP address, it is not allowed to configure another listener on the same port, even only with one particular IP. For example, if there is multiple IP address on the load balancer machine, HTTP traffic needs to be allowed on port 8080 for all IP address, it can be configured in two ways: to set up only one listener using the wild card IP (*) and port 8080; or to set up multiple listeners, with each one using a particular IP and port 8080. These two methods cannot be mixed on the same port.

    There are two types of listeners in LiteSpeed load balancer: plain and secure (SSL). Each secure listener requires a pair of SSL private Key and SSL certificate. The private key can be generated with SSL toolkit like OpenSSL. The SSL certificate can be self signed or obtained from SSL certificate issuer like VeriSign or Thawte. Same private key and certificate pair can be shared among multiple listeners.

  • Listener to Virtual Host Mapping
  • Every listener has a virtual host lookup table. The data in the lookup table are key/value pairs. The key is a domain name for that virtual host; the value is the virtual host itself.

    Here is how it works:

    1. The end user enters a URL in browser
    2. The browser sends a DNS lookup request using the URL's domain name to get the IP address of the load balancer
    3. The browser sends a request to establish a TCP connection with the load balancer on the specific IP and port (a listener)
    4. After the connection is established, the browser sends an HTTP request including the domain name information of the web site.
    5. When the load balancer receives the request, the lookup table associated with that listener will be searched against the domain name in the request. If a match is found, the request will be routed to that virtual host for processing.
    6. The load balancer will then receive the response from the virtual host on a cluster node and send back to the client's browser.

    It is exactly how name based virtual hosting works; IP based virtual hosting is a special case of it.

    In order to make a virtual host accessible through a specific listener, you must make sure:

    1. DNS must be configured properly to map the domain name of the web site to the IP used by that listener. How to configure DNS is beyond the scope of this document.
    2. The mapping to the virtual host on that domain name must exist in the listener's lookup table.

    A catchall virtual host can be specified for one listener with wild card domain name "*". When server cannot find a matching virtual host, the request will be routed to the catchall virtual host. If there is no such catchall virtual host configured, the load balancer will return error code 404.

    Our design of Listener to Virtual Host Mapping provides ultra flexibility, which allows

    • mapping one listener to one virtual host.
    • mapping one listener to different virtual hosts on different domain names.
    • mapping multiple listeners to same virtual host.
    • mapping multiple listeners to multiple virtual hosts on their respective domain names.

    Since a SSL certificate is bundled with a listener, if a virtual host requires a dedicated certificate, a dedicated SSL listener must be created for that virtual host. In other words, that virtual host must be an IP based virtual host.

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