netbox/docs/installation/2-redis.md

Redis is an in-memory key-value store which NetBox employs for caching and queuing. This section entails the installation and configuration of a local Redis instance. If you already have a Redis service in place, skip to the next section.

Ubuntu

# apt-get install -y redis-server

CentOS

# yum install -y redis

Verify Service Status

Use the redis-cli utility to ensure the Redis service is functional:

$ redis-cli ping
PONG