Nixos redis-sentinel config

redis.nix

{ config, pkgs, ... }:

let
  cfg = config.services.redis;
  sentinelConfig = pkgs.writeText "sentinel.conf" ''
    port 26379
    sentinel monitor mymaster 127.0.0.1 6379 1
  '';
in {
  systemd.services.redis-sentinel = {
    description = "Redis-sentinel daemon";

    wantedBy = [ "multi-user.target" ];
    after = [ "network.target" ];

    preStart = ''
      install -m 600 ${sentinelConfig} /run/redis/sentinel.conf
    '';

    serviceConfig = {
      User = "redis";
      Group = "redis";
      ExecStart = "${cfg.package}/bin/redis-sentinel /run/redis/sentinel.conf";
      ExecStop = "${cfg.package}/bin/redis-cli -p 26379 shutdown";
      Restart = "always";
    };
  };

  services.redis.enable = true;
  systemd.services.redis-sentinel.enable = true;
}