Introduction to Redis

Redis is an in-memory database in the NoSQL family that stores data in memory. It provides high availability and can be scaled through clustering.

Install Redis

Installing Redis as a standalone instance on Ubuntu is very straightforward.

sudo apt install redis-server

Check Version

When installed via the apt package manager, Redis version 6.0.16 is installed.

redis-server --version
Redis server v=6.0.16 sha=00000000:0 malloc=jemalloc-5.2.1 bits=64 build=a3fdef44459b3ad6

Check Port

Redis uses port 6379 by default.

netstat -nlpt | grep 6379
tcp        0      0 127.0.0.1:6379          0.0.0.0:*               LISTEN      15184/redis-server

redis-cli

Entering the redis-cli command launches a shell application that allows you to control Redis from the CLI.

$ redis-cli
127.0.0.1:6379> help
redis-cli 6.0.16
To get help about Redis commands type:
      "help @<group>" to get a list of commands in <group>
      "help <command>" for help on <command>
      "help <tab>" to get a list of possible help topics
      "quit" to exit

The commands are very simple. You can store a value for a given key using set, and retrieve the value of a specified key using get. You can delete data for a specified key using the del command.

redis-cli

127.0.0.1:6379> set name testname
OK
127.0.0.1:6379> get name
"testname"
127.0.0.1:6379> keys *
1) "name"
127.0.0.1:6379> del name
(integer) 1
127.0.0.1:6379> keys *
(empty array)