Introduction ​

Overview ​

Memcached is a high-performance, distributed memory object caching server, developed by Brad Fitzpatric from Danga Interactive, a subsidiary of LiveJournal. It is used to cache database query results and reduce database access times to improve the speed and scalability of dynamic web applications.

Official Memcached website: https://memcached.org/

Programming language: C

Brief description: distributed memory object caching system

Environmental Requirements ​

Hardware ​

The following table lists the hardware requirements.

Operating Systems ​

The following table lists the requirements for the operating system.

Check the current OS version.

cat /etc/os-release

For details about installing the openEuler OS, see https://docs.openeuler.org/en/docs/20.03_LTS_SP1/docs/Installation/Installation.html.
Note: You are advised to select the "Server with GUI" installation mode.

Configuring the Compilation Environment ​

To compile Memcached, you need to prepare the C compiler, GNU, make, automake, libevent, and libevent-devel.

1. Install the GNU Compiler Collection (GCC). If GCC has been installed, skip this step.

   bash

   yum -y install gcc gcc-c++ kernel-devel

2. Install GNU make, Automake, unzip, and Telnet. If they have been installed, skip this step.

   bash

   yum -y install make automake unzip telnet

3. Install libevent and libevent-devel.

   bash

   yum -y install libevent libevent-devel

Obtaining Source Code ​

If your server can access the network, run the "wget https://github.com/memcached/memcached/archive/1.5.12.zip" command to download the source code. Otherwise, visit https://github.com/memcached/memcached/archive/1.5.12.zip to download the source code and copy it to the /home directory on the server.

Compiling and Installing Memcached ​

The following uses the source code downloaded to the local PC and then uploaded to the server as an example for describing compilation and installation operations.

1. Decompress the source package.

   bash

   cd /home

   bash

   unzip 1.5.12.zip

2. Go to the memcached-1.5.12 directory.

   bash

   cd memcached-1.5.12

3. Configure Memcached.

   bash

   sh autogen.sh

   bash

   ./configure --prefix=/opt/memcached

   You can specify the Memcached installation directory, for example, /opt/memcached, in this step.

4. Perform compilation.

   bash

   make -j60

   -j60 leverages the multi-core CPUs to speed up compilation.

5. Perform installation.

   bash

   make install

6. Switch to the Memcached installation directory /opt/memcached. If the generated bin directory contains the Memcached executable file, installation is successful.

7. Set environment variables.

   a. Add the following command to the /etc/profile file:

   bash

   export PATH=/opt/memcached/bin/:$PATH

   b. Make the environment variable effective.

   bash

   source /etc/profile

Running and Verifying Memcached ​

• Start Memcached.

  bash

  memcached -t 24 -p 11211 -u root -m 49152 -c 10240

  The following table describes the parameters in the startup command.

• Start another shell window to connect to Memcached.

  bash

  telnet 127.0.0.1 11211

• After creating a connection, run the stats command to obtain the statistics of the Memcached server.

  bash

  stats

  

The following table lists the common stats commands.

Note: To exit the Telnet connection, run the quit command.

quit

In addition to connecting to the Memcached service using Telnet to obtain data, the source code provides some tool scripts, such as memcached-tool, in the scripts directory of the source code.

For details about how to use the memcached-tool, see the following table.