Nginx and Redis - September 2014

1. http://www.nodex.co.uk/article/13-04-12/high-performance-caching-with-nginx-redis-and-php
2. http://wiki.nginx.org/HttpRedis#Download
3. https://rtcamp.com/wordpress-nginx/tutorials/single-site/fastcgi-cache-with-purging/
4. http://search.cpan.org/~dams/Redis-1.975/lib/Redis.pm
5. http://redis.io/topics/data-types-intro

http://www.saltwebsites.com/2012/install-redis-245-service-centos-6

https://www.digitalocean.com/community/tutorials/how-to-install-linux-nginx-mysql-php-lemp-stack-on-ubuntu-12-04

http://eamann.com/tech/ludicrous-speed-wordpress-caching-with-redis

http://10up.com/blog/2012/eric-mann-joins-10up/

apt-get install redis-server

took only a few seconds to install

http://redis.io/download

Online tutorial at http://try.redis.io

To access the command prompt client, type:

redis-cli

service redis-server stop
service redis-server start
/etc/init.d/redis-server restart

redis-server -t && service redis-server reload

set cleveland "browns"
get cleveland
delete cleveland
set counter 0
incr counter
get counter
setnx something "whatever" (sets a key only if it does not already exist)

A list is a series of ordered values. Some of the important commands for interacting with lists are RPUSH, LPUSH, LLEN, LRANGE, LPOP, and RPOP. You can immediately begin working with a key as a list, as long as it doesn't already exist as a different type.

Simple strings, sets and sorted sets already get a lot done but there is one more data type Redis can handle: Hashes.

Hashes are maps between string fields and string values, so they are the perfect data type to represent objects (eg: A User with a number of fields like name, surname, age, and so forth):

HSET user:1000 name "John Smith"
HSET user:1000 email "john.smith@example.com"
HSET user:1000 password "s3cret"

To get back the saved data use HGETALL:

HGETALL user:1000

You can also set multiple fields at once:

HMSET user:1001 name "Mary Jones" password "hidden" email "mjones@example.com"

If you only need a single field value that is possible as well:

HGET user:1001 name => "Mary Jones"

Numerical values in hash fields are handled exactly the same as in simple strings and there are operations to increment this value in an atomic way.

HSET user:1000 visits 10
HINCRBY user:1000 visits 1 => 11
HINCRBY user:1000 visits 10 => 21
HDEL user:1000 visits
HINCRBY user:1000 visits 1 => 1

Check the full list of Hash commands for more information.

Testing

# redis-cli
redis 127.0.0.1:6379> hset user:1 username "jr"
redis 127.0.0.1:6379> hset user:1 email "x@x.com"
redis 127.0.0.1:6379> hset user:1 desc "i like food"
redis 127.0.0.1:6379> exit

Create Perl script:

#!/usr/bin/perl -wT

use Redis;

## Defaults to $ENV{REDIS_SERVER} or 127.0.0.1:6379 per /etc/redis.conf
my $redis = Redis->new;

my $username = $redis->hget('user:1', 'username');

print "hello world $username\n";

http://redis.io/topics/data-types-intro

http://redis.io/topics/twitter-clone
demo: http://retwis.redis.io
source: https://code.google.com/p/redis/downloads/list

Perl

http://search.cpan.org/dist/Redis/

http://search.cpan.org/~dams/Redis-1.975/lib/Redis.pm

Sep 25, 2014 update: - executed perl -MCPAN -e 'install Redis' and installed DAMS/Redis-1.975

http://search.cpan.org/~dpavlin/Redis-0.0801/lib/Redis.pm

https://github.com/PerlRedis/perl-redis

http://redis.io/clients

http://stackoverflow.com/questions/17224585/using-redis-pm-pipeline-in-perl

PhP

https://www.digitalocean.com/community/tutorials/how-to-install-linux-nginx-mysql-php-lemp-stack-on-ubuntu-12-04

For MySQL

sudo apt-get install php5-mysql

For PhP

sudo apt-get install php5-fpm

Didn't do anything because apparently, it was already installed, but I don't remember when I did that, unless something else installed it. I assume the 'F' part is for FastCGI, and when I installed FastCGI, I guess it already installed this package.

Follow the instructions given at the above Digital Ocean web page for the PhP section.

#blogging - #redis - #cache - #scalability