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{ config, lib, pkgs, ...}:
with lib;
let
cfg = config.services.varnish;
commandLine = "-f ${pkgs.writeText "default.vcl" cfg.config}" +
optionalString (cfg.extraModules != []) " -p vmod_path='${makeSearchPathOutput "lib" "lib/varnish/vmods" ([cfg.package] ++ cfg.extraModules)}' -r vmod_path";
in
{
options = {
services.varnish = {
enable = mkEnableOption "Varnish Server";
enableConfigCheck = mkEnableOption "checking the config during build time" // { default = true; };
package = mkOption {
type = types.package;
default = pkgs.varnish;
defaultText = literalExpression "pkgs.varnish";
description = ''
The package to use
'';
};
http_address = mkOption {
type = types.str;
default = "*:6081";
description = "
HTTP listen address and port.
";
};
config = mkOption {
type = types.lines;
description = "
Verbatim default.vcl configuration.
";
};
stateDir = mkOption {
type = types.path;
default = "/var/spool/varnish/${config.networking.hostName}";
defaultText = literalExpression ''"/var/spool/varnish/''${config.networking.hostName}"'';
description = "
Directory holding all state for Varnish to run.
";
};
extraModules = mkOption {
type = types.listOf types.package;
default = [];
example = literalExpression "[ pkgs.varnishPackages.geoip ]";
description = "
Varnish modules (except 'std').
";
};
extraCommandLine = mkOption {
type = types.str;
default = "";
example = "-s malloc,256M";
description = "
Command line switches for varnishd (run 'varnishd -?' to get list of options)
";
};
};
};
config = mkIf cfg.enable {
systemd.services.varnish = {
description = "Varnish";
wantedBy = [ "multi-user.target" ];
after = [ "network.target" ];
preStart = ''
mkdir -p ${cfg.stateDir}
chown -R varnish:varnish ${cfg.stateDir}
'';
postStop = ''
rm -rf ${cfg.stateDir}
'';
serviceConfig = {
Type = "simple";
PermissionsStartOnly = true;
ExecStart = "${cfg.package}/sbin/varnishd -a ${cfg.http_address} -n ${cfg.stateDir} -F ${cfg.extraCommandLine} ${commandLine}";
Restart = "always";
RestartSec = "5s";
User = "varnish";
Group = "varnish";
AmbientCapabilities = "cap_net_bind_service";
NoNewPrivileges = true;
LimitNOFILE = 131072;
};
};
environment.systemPackages = [ cfg.package ];
# check .vcl syntax at compile time (e.g. before nixops deployment)
system.extraDependencies = mkIf cfg.enableConfigCheck [
(pkgs.runCommand "check-varnish-syntax" {} ''
${cfg.package}/bin/varnishd -C ${commandLine} 2> $out || (cat $out; exit 1)
'')
];
users.users.varnish = {
group = "varnish";
uid = config.ids.uids.varnish;
};
users.groups.varnish.gid = config.ids.uids.varnish;
};
}
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