Installing Redis on Sakura VPS CentOS 6.5 and Running It from PHP

Redis - (pronounced “Redis”) Remote Dictionary Server

A tool that lets you build a Key Value Store.

Environment

• Sakura VPS CentOS 6.5 Final
• Redis 2.8.19 (latest Stable as of February 2015)
• PHP 5.4.34

Steps

• Install Redis
• Configure Redis
• Test setting and retrieving Redis data
• Register Redis with chkconfig
• Install phpredis
• Add redis.so to php.ini
• Restart httpd
• Call from PHP and verify behavior

Prepare for the Redis installation

$ sudo su
# yum -y install gcc make

Install Redis

• Download the compressed archive → extract → compile

# cd /usr/local/src
# wget http://redis.googlecode.com/files/redis-2.2.12.tar.gz

--2014-09-12 14:59:10--  http://redis.googlecode.com/files/redis-2.2.12.tar.gz
redis.googlecode.com をDNSに問いあわせています... 74.125.204.82, 2404:6800:4008:c04::52
redis.googlecode.com|74.125.204.82|:80 に接続しています... 接続しました。
HTTP による接続要求を送信しました、応答を待っています... 200 OK
長さ: 455240 (445K) [application/x-gzip]
`redis-2.2.12.tar.gz' に保存中

100%[==================================================================>] 455,240      555K/s 時間 0.8s
2014-09-12 14:59:12 (555 KB/s) - `redis-2.2.12.tar.gz' へ保存完了 [455240/455240]

Extract and build the archive

# tar xzvf redis-2.2.12.tar.gz
# cd redis-2.2.12
# make && make install

Back up the config file

# cp -p redis.conf  redis.conf.org

Edit redis.conf

# vi redis.conf

Changes to redis.conf

# daemon
#daemonize no
daemonize yes

# logfile
#logfile stdout
logfile /var/log/redis.log

#loglevel
#loglevel verbose
loglevel notice

Start the Redis server

# redis-server redis.conf

Start the client

# src/redis-cli

Quick test of the Redis configuration
Set data

# set tanaka test

Retrieve data

# get tanaka
"test"

Create a startup script (under init.d)

sudo cp /usr/local/src/redis-2.2.12/utils/redis_init_script /etc/init.d/redis

Copy the config file

$ sudo mkdir /etc/redis
$ sudo cp /usr/local/src/redis-2.2.12/redis.conf /etc/redis/6379.conf

Edit the config file

$ sudo vim /etc/redis/6379.conf

#daemonize no   デーモン化の設定を有効化。
daemonize yes

# pidfile /var/run/redis.pid   起動シェルの設定にあわせる。
pidfile /var/run/redis_6379.pid

# logfile stdout   ログファイル出力を、標準出力からファイルに変更
logfile /var/log/redis.log

# dir ./   working directoryにdumpファイルが生成されるらしいので、変更します。
dir /usr/local/redis/

Create the directory that will be used later

sudo mkdir /usr/local/redis/

Register it in the chkconfig list so it starts at boot

# /sbin/chkconfig --add redis
# /sbin/chkconfig redis on

service redis does not support chkconfig

The error above is printed when there is a space immediately after the #, so remove that space.

$ cat /etc/init.d/redis

# as it does use of the /proc filesystem.

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

PIDFILE=/var/run/redis_${REDISPORT}.pid
CONF="/etc/redis/${REDISPORT}.conf"

...
...

The first line, # as it does use of the /proc filesystem., is the cause.
Delete this line.

After making the change above, register it in the chkconfig list once more.

• If possible, reboot and verify that it starts.

# reboot
# sudo su -
# cd redis-2.2.12
# src/redis-cli

Install phpredis
// Fetch the source with git

** Edit php.ini

[redis]
extension=redis.so

Check that redis has been added as a PHP module

$ php -m | grep redis

redis

Restart apache to apply the php.ini update

service httpd restart

Verify that the following example displays correctly

<?php
$redis = new Redis();

$redis->connect("127.0.0.1",6379);
$tmp = "redis (^-^)";
$redis->set("test_key",$tmp);
$res = $redis->get("test_key");

var_dump($res);
?>