Tag: Fedora

‘Redis’ is an Open source key-value data store, shared by multiple processes, multiple applications, or multiple Servers. Key values are more complex types like Hashes, Lists, Sets or Sorted Sets.

Let’s have a quick look on the installation steps of “Redis”

Here we go…

Step – 1

First of all we need to switch to superuser & install dependencies:

[code language=”html”]
su
yum install make gcc wget tcl
[/code]

Step-2
Download Redis Packages & Unzip. This guide is based on installing Redis 2.8.3:

[code language=”html”]
wget http://download.redis.io/releases/redis-2.8.3.tar.gz
tar xzvf redis-2.8.3.tar.gz
[/code]

Step-3
Compiling and Installing Redis from the source:

[code language=”html”]
cd redis-2.8.3
make
make install
[/code]

Step- 4

Starting Redis server by executing the following command without any argument:

[code language=”html”]
redis-server
[/code]

Step-5

Check if Redis is working. To check, send a PING command using redis-cli. This will return ‘PONG’ if everything is fine.

[code language=”html”]
redis-cli ping
PONG
[/code]

Step-6

Add Redis-server to init script. Create a directory to store your Redis config files & data:

[code language=”html”]
mkdir -p /etc/redis
mkdir -p /var/redis
[/code]

Also we need to create a directory inside “/var/redis” that works as data &  a working directory for this Redis instance.

[code language=”html”]
mkdir /var/redis/redis
[/code]

Step-7

Copy the template configuration file you’ll find in the root directory of Redis distribution into /etc/redis/

[code language=”html”]
cp redis.conf /etc/redis/redis.conf
[/code]

Edit the configuration file, make sure to perform the following changes:

• Set daemonize to yes (by default it’s set to ‘No’).
• Set the pidfile to /var/run/redis.pid
• Set your preferred loglevel
• Set the logfile to /var/log/redis.log
• Set the dir to /var/redis/redis
• Save and exit from the editor

Step-8 
Add the Redis init script.

[code language=”html”]
vi /etc/init.d/redis
[/code]

And paste the following codes to it

[code language=”html”]
#!/bin/sh
#
# chkconfig: 345 20 80
# description: Redis is an open source (BSD licensed), in-memory data structure store, used as database, cache and message broker.

# Source function library.
. /etc/init.d/functions

REDISPORT=6379
EXEC=/usr/local/bin/redis-server
CLIEXEC=/usr/local/bin/redis-cli

PIDFILE=/var/run/redis.pid
CONF="/etc/redis/redis.conf"

case "$1" in
start)
if [ -f $PIDFILE ]
then
echo "$PIDFILE exists, process is already running or crashed"
else
echo "Starting Redis server…"
$EXEC $CONF
fi
;;
stop)
if [ ! -f $PIDFILE ]
then
echo "$PIDFILE does not exist, process is not running"
else
PID=$(cat $PIDFILE)
echo "Stopping …"
$CLIEXEC -p $REDISPORT shutdown
while [ -x /proc/${PID} ]
do
echo "Waiting for Redis to shutdown …"
sleep 1
done
echo "Redis stopped"
fi
;;
restart)
stop
start
;;
*)
echo "Please use start or stop as first argument"
;;
esac
exit 0
[/code]

Save the file and exit from the editor.

Step-9
Give appropriate permission to the init script

[code language=”html”]
chmod u+x /etc/init.d/redis
[/code]

Step-10
To run the Redis server at startup we need to add it to the chkconfig list.

[code language=”html”]
chkconfig –add redis
chkconfig –level 345 redis on
[/code]

Step-11
Finally we are ready to start the Redis Server.

[code language=”html”]
/etc/init.d/redis start
[/code]

The redis server will start automatically on system boot.

Conclusion:

‘Redis’ also supports datatypes such as Transitions, Publish and Subscribe. ‘Redis’ is considered more powerful than ‘Memcache’. It would be smart to bring ‘Redis’ into practice and put ‘Memcache’ down for a while.

We provide one-stop solution by utilizing Redis server with Rails , PHP applications and deploy in cloud services such as AWS to make sure that the application is fully scalable.

You can also check the compression of Memcached vs Redis, to know more information on which one to pick for Large web apps?

Do you have anything to add here? Share your thoughts with comments.

It’s always pleasure to hear from you and for5 any assistance and support on AWS you can write us at info@andolasoft.com.