Redis

Posted by On 4月 10, 2016 0 Comment

What is Redis?

Redis is key-value store and we call it kind of NoSQL.
It is simple to use.
To share session within servers, or to save easy key-value data in server.

Install

Mac

brew install redis

After running this command, some instruction is shown.

To have launchd start redis at login:
  ln -sfv /usr/local/opt/redis/*.plist ~/Library/LaunchAgents
Then to load redis now:
  launchctl load ~/Library/LaunchAgents/homebrew.mxcl.redis.plist
Or, if you don't want/need launchctl, you can just run:
  redis-server /usr/local/etc/redis.conf

To start redis in local

redis-server /usr/local/etc/redis.conf

To stop redis, Ctrl+C or 

redis-cli shutdown

Access redis from redis-cli

redis-cli

Ubuntu

Install

sudo apt-get install redis-server

Start

sudo /etc/init.d/redis-server start

Configuration file is /etc/redis/redis.conf

Configuration and User Auth

Access limitation

This limitation is by redis.conf
Please look this file

bind 127.0.0.1

By default, only local machine can access.
If comment out this line, we can access this from anywhere
If you want to add additional server acesss

bind 127.0.0.1, 192.168.100.104

Connect and operation

Start

redis-server redis.conf

redis.conf is configuration file
default port is 6379.

Access

To access redis-server, you redis-cli command

redis-cli

Access specific host

redis-cli -h 192.168.122.104

Check Redis sever is alive

redis-cli ping

If alive, PONG will back

Test

After 

set key val
get key

Set value and get value

Set

SET key1 "Hello"

Del

del key

Return (nil)

Delete all keys

flushdb

All keys

redis-cli keys '*'

Redis expires

Add expiration

set key pekepeke
expire key 5
get key
ttl key

get key

expire time is 5s
ttl is check rest time

Data type

Redis has several types of data

  • String
  • List
  • Sets
  • Sorted Sets
  • Hashes
  • Bit array
  • HyperLogLogs

List

rpush mylist A
lpush mylist first
lrange mylist 0 -1
rpop mylist
lpop mylist

rpush : Push data from the last
lpush : Push data from the beginning
lrange : To show data

Hash

hmset user:1000 username daiji nickname dj point 100
hget user:1000 username
hgetall user:1000

Ruby

Use from ruby, redis gem was prepared

gem install redis

In rails, resque, sidekiq etc… background task library uses redis

Ref

MacにRedisをインストールする
https://codeforgeek.com/2015/07/using-redis-to-handle-session-in-node-js/
Command reference
Redisのインストールと基本設定

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