How to Install Memcached on Ubuntu 18.04/16.04 LTS

In this article, We are going to perform How to Install Memcached on Ubuntu 18.04/16.04 LTS

Introduction

Memcached is free and open source distributed memory object caching system which is stored in memory key-value pair. It is commonly used to reduce database load and speed up dynamic web applications.

Prerequisites

  • Ubuntu 18.04/16.04 LTS
  • SSH Access with sudo privileges
  • Open Ports 11211

update the system packages

$ sudo apt-get update

Step 1: How to Install Memcached on Ubuntu

Install memcached and libmemcached-tools using below command.

$ sudo apt-get install memcached  libmemcached-tools -y

once installation done, check the if Memcached service is running using below command,

$ sudo systemctl status memcached.service

Output

● memcached.service - memcached daemon 
Loaded: loaded (/lib/systemd/system/memcached.service; enabled; vendor preset: enabled) 
Active: active (running) since Tue 2020-04-14 14:05:29 UTC; 6min ago
Main PID: 10919 (memcached) 
Tasks: 6 
Memory: 876.0K 
CPU: 16ms CGroup: /system.slice/memcached.service 
└─10919 /usr/bin/memcached -m 64 -p 11211 -u memcache -l 11.4.0.13

Enable Memcached service at system startup

$ sudo systemctl enable memcached.service

Output

Synchronizing state of memcached.service with SysV init with /lib/systemd/systemd-sysv-install...
Executing /lib/systemd/systemd-sysv-install enable memcached

So we have covered how to install Memcached on ubuntu, Below  are commands to start, restart and stop Memcached service.

$ sudo systemctl start memcached.service
$ sudo systemctl restart memcached.service
$ sudo systemctl stop memcached.service

Step 2: Configure Memcached on Ubuntu

Next is to configure Memcached, By default Memcached listen on localhost, If you want to change open Memcached config file  /etc/memcached.config

$ sudo vi /etc/memcached.config

change your server private or public IP as shown below

# memcached default config file
# 2003 - Jay Bonci <[email protected]>
# This configuration file is read by the start-memcached script provided as
# part of the Debian GNU/Linux distribution.

# Run memcached as a daemon. This command is implied, and is not needed for the
# daemon to run. See the README.Debian that comes with this package for more
# information.
-d

# Log memcached's output to /var/log/memcached
logfile /var/log/memcached.log

# Be verbose
# -v

# Be even more verbose (print client commands as well)
# -vv

# Start with a cap of 64 megs of memory. It's reasonable, and the daemon default
# Note that the daemon will grow to this size, but does not start out holding this much
# memory
-m 64

# Default connection port is 11211
-p 11211

# Run the daemon as root. The start-memcached will default to running as root if no
# -u command is present in this config file
-u memcache

# Specify which IP address to listen on. The default is to listen on all IP addresses
# This parameter is one of the only security measures that memcached has, so make sure
# it's listening on a firewalled interface.
-l 192.168.10.15

# Limit the number of simultaneous incoming connections. The daemon default is 1024
# -c 1024

# Lock down all paged memory. Consult with the README and homepage before you do this
# -k

# Return error when memory is exhausted (rather than removing items)
# -M

# Maximize core file limit
# -r

Restart the Memcached Service to take effect

$ sudo systemctl restart memcached.service

Step 3: Install Memcached PHP Module

If you have not installed php on your ubuntu system, follow below commands to install latest php.

Skip this step if you have already installed

$ sudo add-apt-repository ppa:ondrej/php
$ sudo apt-get update
$ sudo apt-get install -y php php-dev php-pear libapache2-mod-php

Use below command to install PHP Memcached on your system

$ sudo apt-get install php-memcached -y

Reload or Restart the Apache service to take effect

$ sudo systemctl reload apache2

OR

$ sudo systemctl restart apache2

Lest test and verify if Memcached is installed and memcached php extension is enabled, create a info.php file in /var/www/html directory

$ sudo nano /var/www/html/info.php

paste the below lines into it and save the file.

<?php
phpinfo();
?>

open your favorite browser and type below your server name or IP followed by info.php.

http://localhost/info.php

Step 4: Add Firewall Rule

Allow port 11211/tcp in Firewall to Access Memcached from remotely

$ sudo ufw allow 11211

Verify if port is enables

$ sudo ufw status

If you have installed Memcached on Cloud Instance Allow the Port in Incoming or Network Security Group

Conclusion:

In this article, We have performed ,How to Install Memcached on Ubuntu 18.04/16.04 LTS System.

Related Articles:

How to Install MariaDB on Ubuntu 18.04/16.04 LTS

How to Install phpMyAdmin on Ubuntu 18.04/16.04

Reference

Memcached Official Page

Sivasai Sagar

I am working as DevOps Engineer and having 5 years of Experience. Likes to share knowledge.

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