redis install ubuntu 20.04 with wordpress php redis mysql configuration

Redis installation on ubuntu 20.04

1st step: update & install redis server form ubuntu repository

sudo apt update && sudo apt install redis-server

2nd redis server configuration

edit

sudo nano /etc/redis/redis.conf

change:

: supervised no // change here

supervised systemd

then it runs as a service

bind local or remote address

bind 127.0.0.1 ::1

maxmemory 256mb
maxmemory-policy allkeys-lru

step 3 restart reload redis

systemctl restart redis

systemctl status redis

check port redis running or not

sudo netstat -lnp | grep redis

to check ports

redis-cli

send ping then it returns pong.

php 7 install redis extension

apt-get install php-redis

check redis module or not by typing

php -m | grep redis

PHP Warning: Module ‘redis’ already loaded in Unknown on line 0
redis

supports PHP 7 then don’t go for manual installation.

memcached storage is low,

php acp dead and rebuild as APCu. store cache in the PHP shared memory (memory-hog >>opcode cache memory, php process memory may unstable>> due to high memory allocated to a single php process when you increase over all php memory)

How to use redis wordpress

installing and configuring Redis, >> installing a PHP extension, >>Redis Object Cache plugin.

#1 Installing php redis extension

apt-get install redis

apt-get install php-redis

Quick & easy but not the latest version.

#2 by Enable Redis object cache in w3 Total cache

Performance (w3tc)>> General settings>> page cache>>

Disc basic
Disc enhance
Php Apcu
Redis (it will available once you load redis PHP extension)

#3 Edit wp-config.php file

define(‘WP_CACHE’, true);
define(‘WP_CACHE_KEY_SALT’, ‘yoursite.com’);

Note: object-cache.php (generated by any plugin) should be ar wp-content directory.

#2nd way install redis object cache plugin

if root access then try this command. shared hosting servers may not offer this.

redis-cli monitor

using redis and mysql together

Redis is an in-memory databases, faster as compare to query the data from hdd MYSQL. also read mysql buffer pool cache

how to use redis with mysql database in Apache nginx

redis php extension from github (predis library from github), or wordpress directory

mysql smart plugin,

like memcached plugin for mysql

InnoDB memcached plugin ( daemon_memcached ) provides an integrated memcached daemon.

Reinstall Uninstall & install redis on Ubuntu 20.4

sudo apt-get remove

sudo apt-get purge redis-server

//pyrhe removes config files

apt install redis-server

check status

service redis-server status

root@-s-4vcpu-8gb-blr1-01:~# service redis-server status
● redis-server.service – Advanced key-value store
Loaded: loaded (/lib/systemd/system/redis-server.service; enabled; vendor preset: enabled)
Active: active (running) sin

ps aux | grep redis

edit redis configuration file

restart

service redis-server start

MySQL and Redis drivers

Installing Redis from source

Latest version 4.0

http://download.redis.io/redis-stable.tar.gz

redis as server

Using Redis as an LRU cache

Installing from source & compile at the server

sudo apt-get update
sudo apt install build-essential

cd /tmp

wget http://download.redis.io/redis-stable.tar.gz

tar xzvf redis-stable.tar.gz && cd redis-stable

make && make install

cleaning temp directory

cd..

2.working with redis configuration file

sudo mkdir /etc/redis && cp redis.conf /etc/redis/

sudo nano /etc/redis/redis.conf

maxmemory 128mb

maxmemory-policy allkeys-lru

supervised no (change)

supervised systemd

working directory

dir ./

change to

dir /var/lib/redis

3.Create Redis systemd Unit File

sudo nano /etc/systemd/system/redis.service

copy & paste the below code

[Unit]
Description=Redis In-Memory Data Store
After=network.target

[Service]
User=redis
Group=redis
ExecStart=/usr/local/bin/redis-server /etc/redis/redis.conf
ExecStop=/usr/local/bin/redis-cli shutdown
Restart=always

[Install]
WantedBy=multi-user.target

save the file by CTRL+X and type and hit enter.

4.Creating User /group /directories and permissions

sudo adduser –system —group –no-create-home redis && mkdir /var/lib/redis && chown redis:redis /var/lib/redis && chmod 770 /var/lib/redis

start

sudo systemctl start redis

stop

sudo systemctl stop redis

restart

sudo systemctl restart redis

Enable Redis on every Bootup

sudo systemctl enable redis

testing:

netstat -lntp to know all listening ports

# redis-cli

127.0.0.1:6397>>ping

you will get pong

Redis configuring with PHP

install the Redis Object Cache Plugin.

APcu vs Memcached vs Redis

implementing Object cache with APCu, Redis for wordpress memcached comparison

>> No need to communicate with another server.

>>NO TCP Connection (to PHP & MySQL)

>> ACpu stores in php shared memory (no separate memory allocation needed, this can cause memory -hog I need to increase PHP memory size and figure out how much MySQL using)

APCu
Does not share the cache with other servers but is faster (maybe)

single machine.

why Redis among Memcached and php apcu?

more features than memcached.

ACPU Installation

from repository

check your distribution version

lsb_release -a

Description: Ubuntu 18.04.1 LTS

step 1:

sudo apt-get install php7.2-apcu -y

step 2:

nano /etc/php/7.2/mods-available/acpu.ini

add the following adjusting memory size

extension=apcu.so
apc.shm_size = “50M”

check php enabled modules by

php -m

restart

step 3:

service php7.2-fpm restart

step 4:

go to w3tc >>general settings>> object cache>> Apc/apcu.

nano /etc/php/7.0/mods-available/apcu.ini

extension=apcu.so
apc.shm_size = “40M”

nano /etc/php/7.0/mods-available/redis.ini

apc

opcache settings for WordPress

don’t disable timestamps. it caches all unnecessary PHP file from /wp-includes and wp-admin/

don’t set large amount memory.

validate settings should be low.

enable memcached plugin with mysql

libmemcached.so: the memcached daemon plugin to MySQL.

innodb_engine.so: an InnoDB API plugin to memcached.

libevent must be installed.

sudo apt-get install libevent-dev

2. step

mysql> source MYSQL_HOME/share/innodb_memcached_config.sql

mysql> USE innodb_memcache;
mysql> SHOW TABLES;

Activate the daemon_memcached plugin by running the INSTALL PLUGIN statement:

mysql> INSTALL PLUGIN daemon_memcached soname “libmemcached.so”;

telnet localhost 11211

how to use memcached with wordpress

memcached used by youtube,fb,twitter, why don;t you. easy to configure.

matured than redis.

#1 install memcached ubuntu / debian family

sudo apt-get update && sudo apt-get install memcached

sudo apt-get install libmemcached-tools (optional)

#1.1 configuring memcached conf memory limit

sudo nano /etc/memcached.conf

default values are enough but 64mb memory

binding
add top of the file if not
-l 127.0.0.1

disable UDP
add bottom of the file
. . .
-U 0

uncomment
. . .
-vv
to enable logging
/var/log/memcached

memory allocation

Locate the -m parameter.
value to MB or GB based on DB size frequently accessed data.

256MB for low end servers 512MB 1Gb as per need.

sudo systemctl restart memcached

check

telnet localhost 11211

Trying 127.0.0.1…

Connected to localhost.

Escape character is ‘^]’.

exit memcached telnet

quit

Connection closed by foreign host.

ps aux | grep memcached

stop memcached

sysctl stop memcached

sysctl disable memcached

#2 install php -memcached extension from github

sudo apt-get install -y php-memcached

(if not works add ppa repository / install from source github)

#3 Edit wp-config.php file

define(‘WP_CACHE’, true);
define(‘WP_CACHE_KEY_SALT’, ‘yoursite.com’);

define(‘WP_CACHE’, true); // Added by W3 Total Cache

#4 install w3tc

used memached for object cache. not page cache (if it done by fastcgi)

Conclusion: i have tried both Apcu and Redis in the past. installed Memcached on the test server as of far i don’t remember about Memcached. its a tie between redis and Apcus. (both Memcached & redis are distributed but Apcu works only for local machine)

Reference:

https://guides.wp-bullet.com/install-redis-object-cache-for-wordpress-php-7-on-ubuntu-16-04/

https://www.digitalocean.com/community/tutorials/how-to-install-and-configure-redis-on-ubuntu-16-04

Redis installation on ubuntu 20.04

2nd redis server configuration

step 3 restart reload redis

check port redis running or not

php 7 install redis extension

How to use redis wordpress

#1 Installing php redis extension

#2 by Enable Redis object cache in w3 Total cache

#3 Edit wp-config.php file

#2nd way install redis object cache plugin

using redis and mysql together

Reinstall Uninstall & install redis on Ubuntu 20.4

Installing Redis from source

2.working with redis configuration file

3.Create Redis systemd Unit File

4.Creating User /group /directories and permissions

APcu vs Memcached vs Redis

ACPU Installation

enable memcached plugin with mysql

how to use memcached with wordpress

#1 install memcached ubuntu / debian family

#1.1 configuring memcached conf memory limit

#2 install php -memcached extension from github

#3 Edit wp-config.php file

#4 install w3tc

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