{ pkgs, lib, config, ... }:
let
  inherit (config.users) users;
in
{
services.redis = {
  enable = true;
  unixSocket = "/run/redis/redis.socket";
  databases = 16;
  syslog = true;
  extraConfig = ''
    bind 127.0.0.1 ::1
    unixsocketperm 660
    maxclients 1024
    maxmemory 500mb
    maxmemory-policy volatile-ttl
  '';
};

users.users.redis.group = "redis";
users.groups."redis" = {};

systemd.services.redis.serviceConfig = {
  RuntimeDirectoryMode = "0750";
  Group = users.redis.group;
};

# As suggested by redis in its logs
boot.kernel.sysctl."vm.overcommit_memory" = 1;
system.activationScripts.redis = ''
  echo never >/sys/kernel/mm/transparent_hugepage/enabled
'';
}