nixpkgs/nixos/modules/services/databases/memcached.nix

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{ config, lib, pkgs, ... }:
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with lib;
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let
cfg = config.services.memcached;
memcached = pkgs.memcached;
in
{
###### interface
options = {
services.memcached = {
enable = mkOption {
default = false;
description = "
Whether to enable Memcached.
";
};
user = mkOption {
default = "memcached";
description = "The user to run Memcached as";
};
listen = mkOption {
default = "127.0.0.1";
description = "The IP address to bind to";
};
port = mkOption {
default = 11211;
description = "The port to bind to";
};
enableUnixSocket = mkEnableOption "unix socket at /run/memcached/memcached.sock";
maxMemory = mkOption {
default = 64;
description = "The maximum amount of memory to use for storage, in megabytes.";
};
maxConnections = mkOption {
default = 1024;
description = "The maximum number of simultaneous connections";
};
extraOptions = mkOption {
default = [];
description = "A list of extra options that will be added as a suffix when running memcached";
};
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};
};
###### implementation
config = mkIf config.services.memcached.enable {
users.users = optional (cfg.user == "memcached") {
name = "memcached";
description = "Memcached server user";
};
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environment.systemPackages = [ memcached ];
systemd.services.memcached = {
description = "Memcached server";
wantedBy = [ "multi-user.target" ];
after = [ "network.target" ];
serviceConfig = {
PermissionsStartOnly = true;
ExecStartPre = optionals cfg.enableUnixSocket [
"${pkgs.coreutils}/bin/install -d -o ${cfg.user} /run/memcached/"
"${pkgs.coreutils}/bin/chown -R ${cfg.user} /run/memcached/"
];
ExecStart =
let
networking = if cfg.enableUnixSocket
then "-s /run/memcached/memcached.sock"
else "-l ${cfg.listen} -p ${toString cfg.port}";
in "${memcached}/bin/memcached ${networking} -m ${toString cfg.maxMemory} -c ${toString cfg.maxConnections} ${concatStringsSep " " cfg.extraOptions}";
User = cfg.user;
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};
};
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};
imports = [
(mkRemovedOptionModule ["services" "memcached" "socket"] ''
This option was replaced by a fixed unix socket path at /run/memcached/memcached.sock enabled using services.memached.enableUnixSocket.
'')
];
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}