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Use stable v2 instead of beta release Applies to 20.03 or older only In NixOS 20.03, caddy package is still version 1.0.4 and caddy2 package uses version 2.0 beta 10. The package maintainer plans to upgrade the caddy package to v2 in 20.09, while retaining v1 as caddy1 . In the meantime, I show you how to run v2 stable release by using the caddy2 package from the unstable channel; note that this only affects caddy2 package, all other packages still use the stable nixos channel. (Execute commands with “sudo” privilege) Add the unstable channel: $ nix-channel --add https://nixos.org/channels/nixos-unstable $ nix-channel --update unstable Add caddyTwo.nix file (this example stores the file in “/etc/caddy”): /etc/caddy/caddyTwo.nix { config, lib, pkgs, ... }: with lib; let cfg = config.services.caddyTwo; # v2-specific options isCaddy2 = versionAtLeast cfg.package.version "2.0" ; in { options.services. caddyTwo = { enable = mkEnableOption "Caddy web server" ; config = mkOption { default = "/etc/caddy/Caddyfile" ; type = types.str; description = "Path to Caddyfile" ; }; dataDir = mkOption { default = "/var/lib/caddy" ; type = types.path; description = '' The data directory, for storing certificates. Before 17.09, this would create a .caddy directory. With 17.09 the contents of the .caddy directory are in the specified data directory instead. '' ; package = mkOption { default = pkgs.caddy; defaultText = "pkgs.caddy" ; type = types.package; description = "Caddy package to use." ; }; adapter = mkOption { default = "caddyfile" ; example = "nginx" ; type = types.str; description = '' Name of the config adapter to use. Not applicable to Caddy v1. See https://caddyserver.com/docs/config-adapters for the full list. '' ; config = mkIf cfg.enable { systemd.services. caddy = { description = "Caddy web server" ; after = [ "network-online.target" ]; wantedBy = [ "multi-user.target" ]; environment = mkIf (versionAtLeast config.system.stateVersion "17.09" && !isCaddy2) { CADDYPATH = cfg.dataDir; }; startLimitIntervalSec = 14400 ; startLimitBurst = 10 ; serviceConfig = { ExecStart = if isCaddy2 then '' ${cfg.package} /bin/caddy run --config ${cfg.config} --adapter ${cfg.adapter} '' else '' ${cfg.package} /bin/caddy -root=/var/tmp -conf= ${cfg.config} '' ; ExecReload = if isCaddy2 then " ${cfg.package} /bin/caddy reload --config ${cfg.config} --adapter ${cfg.adapter} " else " ${pkgs.coreutils} /bin/kill -USR1 $MAINPID" ; Type = "simple" ; User = "caddy" ; Group = "caddy" ; Restart = "on-abnormal" ; NoNewPrivileges = true ; LimitNPROC = 512 ; LimitNOFILE = 1048576 ; PrivateTmp = true ; PrivateDevices = true ; ProtectHome = true ; ProtectSystem = "full" ; ReadWriteDirectories = cfg.dataDir; KillMode = "mixed" ; KillSignal = "SIGQUIT" ; TimeoutStopSec = "5s" ; # Remove two options below if caddy doesn't listen on port {}; in { # existing options require = [ /etc/caddy/caddyTwo.nix ]; services. caddyTwo = { enable = true ; package = unstable.caddy2; config = "/path/to/caddyFile" ; adapter = "caddyfile" ; }; } Runs a rebuild and check the status: $ nixos-rebuild switch $ systemctl status caddy To revert to v1, remove package and adapter options: /etc/nixos/configuration.nix services. caddyTwo = { enable = true ; config = "/path/to/caddyFile" ; };