{ pkgs, lib, config, ... }:
let
  inherit (config.networking) hostName;
  inherit (config.users) users;
in
{
fileSystems."/var/lib/redis" = {
  device = "${hostName}/var/redis";
  fsType = "zfs";
};

services.redis = {
  enable = true;
  unixSocket = "/run/redis/redis.socket";
  databases = 16;
  syslog = true;
  bind = "127.0.0.1 ::1";
  settings = {
    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
'';
}