Debian

Redis is an open-source, in-memory, data-structure store with optional disk writes for persistence, which can be used as key-value database, cache and message broker. Redis features built-in transactions, replication, and support for a
variety of data structures such as strings, hashes, lists, sets and others. Redis can be made highly available with Redis Sentinel and supports automatic partitioning with Redis Cluster. This document provides both instructions for depl
oying the Redis server and an overview of best practices for maintaining Redis instances.

Previous versions of Linux distributions like Debian or Ubuntu, which were distributed with SysV init or Upstart, used init scripts located in the /etc/rc.d/init.d/ directory. These init scripts were typically written in Bash, and allowed the system administrator to control the state of services and daemons in their system. With systemd these init scripts have been replaced with service units.