Using Redis with Ruby
In order to use Redis with Ruby you need a Ruby Redis client. In the following sections, we demonstrate the use of redis-rb, a Ruby client library for Redis. Additional Ruby clients for Redis can be found under the Ruby section of the Redis Clients page.
Installing redis-rb
redis-rb’s installation instructions are given in the README file. Use gem
to install redis-rb:
gem install redis
Or, include redis-rb
in your Gemfile by adding to it the following line:
gem 'redis'
Followed by executing bundle install
.
Opening a connection to Redis using redis-rb
The following code creates a connection to Redis using redis-rb:
require 'redis'
redis = Redis.new (
:host => 'hostname',
:port => port,
:password => 'password')
To adapt this example to your code, make sure that you replace the following values with those of your database:
- In line 4, the
:host
should be your database’s hostname or IP address - In line 5, the
:port
should be your database’s port - In line 6, the
:password
should be your database’s password
Using SSL and redis-rb
redis-rb does not support SSL connections natively. For an added security measure, you can secure the connection using stunnel or this redis-rb fork that has been added with SSL support.
Reading and writing data with redis-rb
Once connected to Redis, you can start reading and writing data. The following code snippet writes the value bar
to the Redis key foo
, reads it back, and prints it:
# open a connection to Redis
...
redis.set('foo', 'bar');
value = redis.get('foo');
puts value
The output of the above code should be:
$ ruby example_redis-rb.rb
bar