Ubuntu 20.04 system download source code/compile and install Memcached tutorial

Memcached is a high-performance, open source distributed in-memory object caching system that is commonly used to accelerate dynamic web applications by storing frequently requested data from database calls and application request results. Memcached is an excellent solution that reduces database load and acts as a placeholder for requests that cannot be served from the database. It provides different ways to store data such as key-value pairs or sorted sets. The acceleration effect of Memcached is quite obvious. We have been using it on our website and the effect is obvious.

In fact, Memcached can be installed directly on the Pagoda panel, which is very simple, convenient and fast. However, we can also choose to install it manually, compile and install it from the source code, and we may feel a sense of accomplishment.

1. Install dependencies

You need to install some tools to compile the Memcached source package.

$ sudo apt-get install gcc make libevent-dev libc6-dev --no-install-recommends

The option –no-install-recommends is used to install only the mentioned packages.

Other package descriptions are as follows:

• gcc is a well-known C compiler for Memcached source files.
• make is used to guide compilation
• libc6-dev is used to reference the GNU C library and header files
• libevent-dev is a well-known asynchronous event notification development file

Install all Memcached dependencies to download the Memcached source package and install it into your system.

2. Download and compile Memcached

Download the latest Memcached files:

$ wget https://memcached.org/latest

Unzip the installation package:

$ tar -xvf latest

Change the working directory to the extracted files. If you downloaded a newer version, the directory name may be different.

$ cd Memcached-1.6.12/

Use the –prefix= parameter to set the directory where Memcached binaries and libraries are installed. For example, the following example uses the /usr/local directory.

$ ./configure --prefix=/usr/local/memcached

Compile Memcached source code:

$ make

Confirm Memcached version number:

$ ./memcached --version

Install Memcached:

$ sudo make install

Tests that Memcached is active and running on TCP port 11211.

$ netstat -tulpn | grep :11211

3. Memcached service management tutorial

After successfully installing Memcached, you can use the systemctl command to manage the Memcached service.

Start the Memcached service:

sudo systemctl start memcached

Check the status of Memcached:

sudo systemctl status memcached

To stop Memcached:

sudo systemctl stop memcached

4. Memcached security settings tutorial

By default, Memcached runs on the local interface with a TCP port. To limit potential attacks, block incoming UDP connections on Memcached port 11211 through your firewall.

$ sudo ufw deny 11211/udp

5. Configure Memcached

You can also restrict Memcached to the local interface via a configuration file. Open the Memcached configuration file using your favorite editor.

sudo vi /etc/memcached.conf

Find the following lines in the file and uncomment them if there are any.

-l 127.0.0.1

If you also want to limit UDP, add the following lines at the end of the file.

-U 0

Save the file and restart the service:

sudo systemctl restart memcached

Use netstat to verify that Memcached is bound to the local interface and is only listening for TCP connections.

sudo netstat -plunt

6. Verify Memcached settings

You can verify Memcached settings using memcstat from the libmemcached-tools package.

memcstat --servers="localhost"

You will get output similar to:

Server: localhost (11211) pid: 3927 uptime: 2217682 time: 1547170226 version: 1.4.25 libevent: 2.0.21-stable pointer_size: 64 rusage_user: 75.436000 rusage_system: 57.768000 curr_connections: 1 total_connections: 53082 ...

7. Example of connecting to Memcached

PHP

If you want to use Memcached as a cache database for your PHP applications (such as WordPress, Magento, Joomla or Drupal), you should use the Memcached extension, which you can install:

sudo apt install php-memcached

Python

pip install pymemcache pip install python-memcached

At this point, you can successfully install and use Memcached to accelerate the website.

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