112 lines
3.2 KiB
Nix
112 lines
3.2 KiB
Nix
{ config, lib, pkgs, ... }:
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let
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cfg = config.services.haproxy;
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haproxyCfg = pkgs.writeText "haproxy.conf" ''
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global
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# needed for hot-reload to work without dropping packets in multi-worker mode
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stats socket /run/haproxy/haproxy.sock mode 600 expose-fd listeners level user
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${cfg.config}
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'';
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in
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with lib;
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{
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options = {
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services.haproxy = {
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enable = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Whether to enable HAProxy, the reliable, high performance TCP/HTTP
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load balancer.
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'';
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};
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user = mkOption {
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type = types.str;
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default = "haproxy";
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description = "User account under which haproxy runs.";
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};
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group = mkOption {
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type = types.str;
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default = "haproxy";
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description = "Group account under which haproxy runs.";
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};
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config = mkOption {
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type = types.nullOr types.lines;
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default = null;
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description = ''
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Contents of the HAProxy configuration file,
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<filename>haproxy.conf</filename>.
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'';
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};
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};
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};
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config = mkIf cfg.enable {
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assertions = [{
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assertion = cfg.config != null;
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message = "You must provide services.haproxy.config.";
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}];
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# configuration file indirection is needed to support reloading
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environment.etc."haproxy.cfg".source = haproxyCfg;
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systemd.services.haproxy = {
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description = "HAProxy";
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after = [ "network.target" ];
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wantedBy = [ "multi-user.target" ];
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serviceConfig = {
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User = cfg.user;
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Group = cfg.group;
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Type = "notify";
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ExecStartPre = [
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# when the master process receives USR2, it reloads itself using exec(argv[0]),
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# so we create a symlink there and update it before reloading
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"${pkgs.coreutils}/bin/ln -sf ${pkgs.haproxy}/sbin/haproxy /run/haproxy/haproxy"
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# when running the config test, don't be quiet so we can see what goes wrong
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"/run/haproxy/haproxy -c -f ${haproxyCfg}"
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];
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ExecStart = "/run/haproxy/haproxy -Ws -f /etc/haproxy.cfg -p /run/haproxy/haproxy.pid";
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# support reloading
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ExecReload = [
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"${pkgs.haproxy}/sbin/haproxy -c -f ${haproxyCfg}"
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"${pkgs.coreutils}/bin/ln -sf ${pkgs.haproxy}/sbin/haproxy /run/haproxy/haproxy"
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"${pkgs.coreutils}/bin/kill -USR2 $MAINPID"
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];
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KillMode = "mixed";
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SuccessExitStatus = "143";
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Restart = "always";
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RuntimeDirectory = "haproxy";
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# upstream hardening options
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NoNewPrivileges = true;
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ProtectHome = true;
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ProtectSystem = "strict";
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ProtectKernelTunables = true;
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ProtectKernelModules = true;
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ProtectControlGroups = true;
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SystemCallFilter= "~@cpu-emulation @keyring @module @obsolete @raw-io @reboot @swap @sync";
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# needed in case we bind to port < 1024
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AmbientCapabilities = "CAP_NET_BIND_SERVICE";
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};
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};
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users.users = optionalAttrs (cfg.user == "haproxy") {
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haproxy = {
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group = cfg.group;
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isSystemUser = true;
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};
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};
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users.groups = optionalAttrs (cfg.group == "haproxy") {
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haproxy = {};
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};
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};
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}
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