diff --git a/all-packages.nix b/all-packages.nix
index e08304a..029bbd4 100644
--- a/all-packages.nix
+++ b/all-packages.nix
@@ -10,9 +10,12 @@ let
 
   self = rec {
     PostgresDB = callPackage ./postgresdb {};
+    mkPostgresDB = callPackage ./postgresdb/mkdefault.nix {inherit PostgresDB;};
 
     HaproxyConfig = callPackage ./haproxy/config.nix {inherit utils;};
+    mkHaproxyConfig = callPackage ./haproxy/mkconfig.nix {inherit HaproxyConfig;};
     HaproxyService = callPackage ./haproxy/unit.nix {inherit utils;};
+    mkHaproxyService = callPackage ./haproxy/mkunit.nix {inherit HaproxyService;};
     mkHaproxySiteConfig = callPackage ./haproxy/siteconfig.nix {};
 
     CaddyConfig = callPackage ./caddy/config.nix {inherit utils;};
@@ -21,21 +24,29 @@ let
     mkCaddySiteConfig = callPackage ./caddy/mksiteconfig.nix {inherit CaddySiteConfig;};
 
     NginxService = callPackage ./nginx/unit.nix {inherit utils;};
+    mkNginxService = callPackage ./nginx/mkunit.nix {inherit NginxService;};
     NginxSiteConfig = callPackage ./nginx/siteconfig.nix {inherit utils;};
     mkNginxSiteConfig = callPackage ./nginx/mksiteconfig.nix {inherit NginxSiteConfig;};
 
     PHPConfig = callPackage ./php/config.nix {inherit utils;};
+    mkPHPSiteConfig = callPackage ./php/siteconfig.nix {inherit PHPConfig;};
 
     PHPFPMConfig = callPackage ./php-fpm/config.nix {inherit utils;};
+    mkPHPFPMConfig = callPackage ./php-fpm/mkconfig.nix {inherit PHPFPMConfig;};
     PHPFPMService = callPackage ./php-fpm/unit.nix {inherit utils;};
+    mkPHPFPMService = callPackage ./php-fpm/mkunit.nix {inherit PHPFPMService;};
     PHPFPMSiteConfig = callPackage ./php-fpm/siteconfig.nix {inherit utils;};
     mkPHPFPMSiteConfig = callPackage ./php-fpm/mksiteconfig.nix {inherit PHPFPMSiteConfig;};
 
     TtrssEnvironment = callPackage ./ttrss/environment.nix {};
     TtrssConfig = callPackage ./ttrss/config.nix {};
+    mkTtrssConfig = callPackage ./ttrss/mkconfig.nix {inherit TtrssConfig;};
     TtrssUpdateService = callPackage ./ttrss/update.nix {inherit utils;};
+    mkTtrssUpdateService = callPackage ./ttrss/mkupdate.nix {inherit TtrssUpdateService;};
     TtrssUpgradeDBService = callPackage ./ttrss/dbupgrade.nix {};
+    mkTtrssUpgradeDBService = callPackage ./ttrss/mkdbupgrade.nix {inherit TtrssUpgradeDBService;};
     TtrssPHPNormalizeHeaders = callPackage ./ttrss/normalize-headers.nix {inherit utils;};
+    mkTtrssPHPNormalizeHeaders = callPackage ./ttrss/mk-normalize-headers.nix {inherit TtrssPHPNormalizeHeaders;};
   };
 in
 self
diff --git a/haproxy/mkconfig.nix b/haproxy/mkconfig.nix
new file mode 100644
index 0000000..d40da34
--- /dev/null
+++ b/haproxy/mkconfig.nix
@@ -0,0 +1,31 @@
+{ HaproxyConfig
+}:
+{ name
+, configDir
+, configFile
+, user
+, group
+, statsEnable ? false
+, statsPort ? null
+, prometheusStatsUri ? null
+, certPath ? null
+, acls ? []
+, backends ? []
+, dependsOn ? {}
+}:
+{
+  inherit name configDir configFile;
+  inherit user group;
+  pkg = HaproxyConfig {
+    inherit configDir configFile;
+    inherit user group;
+    inherit statsEnable statsPort;
+    inherit prometheusStatsUri;
+    inherit certPath;
+
+    inherit acls backends;
+  };
+
+  inherit dependsOn;
+  type = "fileset";
+}
diff --git a/haproxy/mkunit.nix b/haproxy/mkunit.nix
new file mode 100644
index 0000000..9eae110
--- /dev/null
+++ b/haproxy/mkunit.nix
@@ -0,0 +1,17 @@
+{ HaproxyService
+}:
+{ name
+, configDir
+, configFile
+, dependsOn ? {}
+}:
+
+{
+  inherit name configDir configFile;
+  pkg = HaproxyService {
+    inherit configDir configFile;
+  };
+
+  inherit dependsOn;
+  type = "systemd-unit";
+}
diff --git a/nginx/mksiteconfig.nix b/nginx/mksiteconfig.nix
index f95ad83..83018ea 100644
--- a/nginx/mksiteconfig.nix
+++ b/nginx/mksiteconfig.nix
@@ -7,6 +7,7 @@
 , siteName
 , siteRoot
 , phpFpmSiteSocket ? ""
+, dependsOn ? {}
 }:
 rec {
   inherit name siteConfigDir;
@@ -21,5 +22,7 @@ rec {
     siteSocket = nginxSocket;
     serviceRoot = siteRoot;
   };
+
+  inherit dependsOn;
   type = "fileset";
 }
diff --git a/nginx/mkunit.nix b/nginx/mkunit.nix
new file mode 100644
index 0000000..2a06494
--- /dev/null
+++ b/nginx/mkunit.nix
@@ -0,0 +1,24 @@
+{ NginxService
+}:
+{ name
+, configDir
+, configFile
+, user
+, group
+, runtimeDirectory
+, serviceSuffix
+, dependsOn ? {}
+}:
+{
+  inherit name configDir configFile;
+  inherit user group;
+  inherit runtimeDirectory;
+  pkg = NginxService {
+    inherit serviceSuffix;
+    inherit user group;
+    inherit configDir configFile;
+  };
+
+  inherit dependsOn;
+  type = "systemd-unit";
+}
diff --git a/php-fpm/mkconfig.nix b/php-fpm/mkconfig.nix
new file mode 100644
index 0000000..14ebecb
--- /dev/null
+++ b/php-fpm/mkconfig.nix
@@ -0,0 +1,20 @@
+{ PHPFPMConfig
+}:
+{ name
+, configDir
+, configFile
+, siteConfigDir
+, dependsOn ? {}
+}:
+
+{
+  inherit name configDir configFile;
+  inherit siteConfigDir;
+
+  pkg = PHPFPMConfig {
+    inherit configDir configFile siteConfigDir;
+  };
+
+  inherit dependsOn;
+  type = "fileset";
+}
diff --git a/php-fpm/mksiteconfig.nix b/php-fpm/mksiteconfig.nix
index cd8f1cd..0852dbd 100644
--- a/php-fpm/mksiteconfig.nix
+++ b/php-fpm/mksiteconfig.nix
@@ -10,12 +10,11 @@
 , siteSocket
 , socketUser
 , socketGroup
-, dependsOn
-, connectsTo
+, dependsOn ? {}
+, connectsTo ? {}
 }:
 rec {
   inherit name user group siteSocket;
-  inherit dependsOn connectsTo;
 
   pkg = PHPFPMSiteConfig {
     inherit (PHPFPMConfig) siteConfigDir;
@@ -26,5 +25,7 @@ rec {
     serviceRoot = siteRoot;
     allowedClients = "127.0.0.1";
   };
+
+  inherit dependsOn connectsTo;
   type = "fileset";
 }
diff --git a/php-fpm/mkunit.nix b/php-fpm/mkunit.nix
new file mode 100644
index 0000000..b90c3b5
--- /dev/null
+++ b/php-fpm/mkunit.nix
@@ -0,0 +1,26 @@
+{ PHPFPMService
+}:
+{ name
+, configDir
+, configFile
+, phpIniConfigDir
+, phpIniConfigFile
+, runtimeDirectory
+, serviceSuffix
+, dependsOn ? {}
+}:
+
+{
+  inherit name configDir configFile;
+  inherit phpIniConfigDir phpIniConfigFile;
+  inherit runtimeDirectory;
+
+  pkg = PHPFPMService {
+    inherit serviceSuffix;
+    configFile = "${configDir}/${configFile}";
+    phpIni = "${phpIniConfigDir}/${phpIniConfigFile}";
+  };
+
+  inherit dependsOn;
+  type = "systemd-unit";
+}
diff --git a/php/siteconfig.nix b/php/siteconfig.nix
new file mode 100644
index 0000000..3ff0cfe
--- /dev/null
+++ b/php/siteconfig.nix
@@ -0,0 +1,18 @@
+{ PHPConfig
+}:
+{ name
+, configDir
+, configFile
+, pkgExtraArguments ? {}
+, dependsOn ? {}
+}:
+rec {
+  inherit name configDir configFile;
+  inherit dependsOn;
+
+  pkg = PHPConfig ({
+    inherit configDir configFile;
+  } // pkgExtraArguments);
+
+  type = "fileset";
+}
diff --git a/postgresdb/mkdefault.nix b/postgresdb/mkdefault.nix
new file mode 100644
index 0000000..ffff2b8
--- /dev/null
+++ b/postgresdb/mkdefault.nix
@@ -0,0 +1,20 @@
+{ PostgresDB
+}:
+{ name
+, username
+, password
+, database
+, dependsOn ? {}
+}:
+
+{
+  inherit name;
+  pkg = PostgresDB {
+    postgresUsername = username;
+    postgresPassword = password;
+    postgresDatabase = database;
+  };
+
+  inherit dependsOn;
+  type = "postgresql-database";
+}
diff --git a/ttrss/mk-normalize-headers.nix b/ttrss/mk-normalize-headers.nix
new file mode 100644
index 0000000..b9852e5
--- /dev/null
+++ b/ttrss/mk-normalize-headers.nix
@@ -0,0 +1,14 @@
+{ TtrssPHPNormalizeHeaders
+}:
+{ name
+, configDir ? "/etc/php"
+, configFile ? "normalize-headers.php"
+}:
+rec {
+  inherit name configDir configFile;
+
+  pkg = TtrssPHPNormalizeHeaders {
+    inherit configDir configFile;
+  };
+  type = "fileset";
+}
diff --git a/ttrss/mkconfig.nix b/ttrss/mkconfig.nix
new file mode 100644
index 0000000..f224126
--- /dev/null
+++ b/ttrss/mkconfig.nix
@@ -0,0 +1,37 @@
+{ TtrssConfig
+}:
+{ name
+, user
+, group
+, serviceName
+, document_root
+, lock_directory
+, cache_directory
+, feed_icons_directory
+, enabled_plugins ? []
+, auth_remote_post_logout_url ? null
+
+, db_host
+, db_port
+, db_username
+, db_password
+, db_database
+
+, dependsOn ? {}
+}:
+
+{
+  inherit name;
+  pkg = TtrssConfig {
+    name = serviceName;
+    inherit document_root lock_directory cache_directory feed_icons_directory;
+    inherit user group;
+
+    inherit db_host db_port db_username db_password db_database;
+    inherit enabled_plugins;
+    inherit auth_remote_post_logout_url;
+  };
+
+  inherit dependsOn;
+  type = "fileset";
+}
diff --git a/ttrss/mkdbupgrade.nix b/ttrss/mkdbupgrade.nix
new file mode 100644
index 0000000..5fd2de0
--- /dev/null
+++ b/ttrss/mkdbupgrade.nix
@@ -0,0 +1,17 @@
+{ TtrssUpgradeDBService
+}:
+{ name
+, user
+, binDir
+, dependsOn ? {}
+}:
+
+{
+  inherit name;
+  pkg = TtrssUpgradeDBService {
+    inherit user binDir;
+  };
+
+  inherit dependsOn;
+  type = "wrapper";
+}
diff --git a/ttrss/mkupdate.nix b/ttrss/mkupdate.nix
new file mode 100644
index 0000000..9ef78ca
--- /dev/null
+++ b/ttrss/mkupdate.nix
@@ -0,0 +1,25 @@
+{ TtrssUpdateService
+}:
+{ name
+, user
+, group
+, documentRoot
+, readOnlyPaths
+, readWritePaths
+, postgresServiceName
+, dependsOn ? {}
+}:
+
+{
+  inherit name;
+  pkg = TtrssUpdateService {
+    inherit documentRoot;
+    inherit user group;
+
+    inherit readOnlyPaths readWritePaths;
+    inherit postgresServiceName;
+  };
+
+  inherit dependsOn;
+  type = "systemd-unit";
+}
diff --git a/ttrss/update.nix b/ttrss/update.nix
index 204d501..0107381 100644
--- a/ttrss/update.nix
+++ b/ttrss/update.nix
@@ -3,7 +3,7 @@
 , lib
 , utils
 }:
-{ document_root
+{ documentRoot
 , user
 , group
 , readOnlyPaths ? []
@@ -22,7 +22,7 @@
 # - LOCK_DIRECTORY should be writable.
 
 let
-  fullPath = "${document_root}";
+  fullPath = "${documentRoot}";
   roPaths = [fullPath] ++ readOnlyPaths;
 in
 utils.systemd.mkService rec {