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Install LSMemcached on OpenLiteSpeed

by Thạch Phạm

Install LSMemcached on OpenLiteSpeed quickly with a few simple steps with AZDIGI to provide a good experience operating your WordPress website.

I. Overview

Continuing with the series about OpenLiteSpeed, today AZDIGI will guide you on installing LSMemcached on the OpenLiteSpeed server and optimizing it to bring outstanding performance to your website. So before going into the installation, let’s find out briefly what LSMemcached is.

What is LSMemcached?

LSMemcached is an improved version of Memcached. LSMemcached is a source code that supports the best Object Caching cache available today, you can briefly understand that LSMemcached is a perfect combination of Memcached and Redis, from which LSMemcached was created. With the combination of LSMemcached with OpenLiteSpeed, your server and your website will have extremely superior performance compared to the rest.

So how to install LSMemcached on the simplest OpenLiteSpeed server? Please continue to see the installation steps below.

II. Implementation Guide

To install LSMemcached on the OpenLiteSpeed server, you can follow these 2 steps.

Step 1: Install LSMemcached

To install the LSMemcached source code, you first need to SSH into your VPS with the highest privilege as root. If you do not know how to SSH, you can check out the instructions below:

After successfully SSH to the VPS, install the LSMemcached source code with the following command:

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cd ~
yum groupinstall "Development Tools" 
yum install autoconf automake zlib-devel openssl-devel expat-devel pcre-devel libmemcached-devel cyrus-sasl*
git clone https://github.com/litespeedtech/lsmcd.git
cd lsmcd
./configure CFLAGS=" -O3" CXXFLAGS=" -O3"
sudo make install

Command annotation:

  • Command 1: Move to the root directory of the VPS
  • Command 2,3,4,5,6,7,8: Install the source code and the LSMemcached repository.

After the installation is complete, use the following command to open and edit the content of the node.conf file:

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vi /usr/local/lsmcd/conf/node.conf 

After you have opened the file, you can delete all the content inside and replace it with the content below and save it.


#default is 8, it can be bigger depending on cache data amount

#If you change the UseSasl or DataByUser configuration options you need to remove the ShmDir folder and contents.

##this is the global setting, no need to have per slice configuration. 
#depends CPU core

Thus, the installation of LSMemcached is completed. Now you use the following commands to enable and set up LSMemcached startup with the system.

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systemctl start lsmcd
systemctl enable lsmcd
chkconfig lsmcd on

Then you restart Litespeed is completed.

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systemctl restart lsws

Step 2: Configure LSMemcached with your website

To connect LSMemcached to the website, we have 2 methods to connect:

  • Method 1: Connect via IP and Port LSMemcached.
  • Method 2: Connect through the Unix socket port.

It is recommended to connect to Unix Socket when you are a basic user using Webserver with a small model or hosting, you should use connection via Unix Socket. Because with Unix Socket will bring about 30% faster speed than connecting via a network port and better security because the file can only be read as localhost.

It is recommended to connect through the network port when your Webserver scale is large or very large and requires a high load balance. For example, if your system runs a separate database and web server, you should use the network port to connect to LSMemcached.

You can see more details about the configuration of LSMemcached here.

And specifically, the information that you need to declare LSMemcached is as follows:


Now we will go into connecting LSMemcached to the website. With WordPress, to connect to LSMemcached, you can install and use a plugin called LiteSpeed Cache.

Install LSMemcached on OpenLiteSpeed

After installing the plugin, you do the following configuration:

  • Enable via Unix socket

Go to Litespeed cache (1) => Cache (2)=> Object (3)=> ON (4)=> Memcached (5) => /tmp/lsmcd.sock (6)=> 0 (7) => Save (8).

Install LSMemcached on OpenLiteSpeed

  • Enable via the Port

Access Litespeed cache (1) => Cache (2)=> Object (3)=> ON (4)=> Memcached (5)=> localhost (6)=> 11211 (7) => Save (8).

Install LSMemcached on OpenLiteSpeed

If the connection fails, please check if Port 11211 is open. If not, you can open the port with the following command:

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firewall-cmd --zone=public --add-port=11211/tcp --permanent
firewall-cmd --reload

III. Summary

So in this article, AZDIGI has shown you the complete installation of LSMemcached on the OpenLiteSpeed server in the most detail. If you want your website to work at full performance, you should not skip this installing and configuration section. Hopefully, this article will help you to install Let’s Encrypt SSL successfully!

If you find the article helpful, please share it widely. In addition, you can refer to some other articles about OpenLiteSpeed at the link below:

If you need assistance, you can contact support in the ways below:

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