diff --git a/changelog/unreleased/serviceUser-systemUser.md b/changelog/unreleased/serviceUser-systemUser.md
new file mode 100644
index 00000000000..6310f12278c
--- /dev/null
+++ b/changelog/unreleased/serviceUser-systemUser.md
@@ -0,0 +1,6 @@
+Change: rename serviceUser to systemUser
+
+We renamed serviceUser to systemUser in all configs and vars
+including yaml-tags and env vars 
+
+https://github.com/owncloud/ocis/pull/3673
diff --git a/extensions/settings/pkg/config/config.go b/extensions/settings/pkg/config/config.go
index 9bae2fae420..e9f79f52e41 100644
--- a/extensions/settings/pkg/config/config.go
+++ b/extensions/settings/pkg/config/config.go
@@ -39,7 +39,7 @@ type Metadata struct {
 	GatewayAddress string `yaml:"gateway_addr" env:"STORAGE_GATEWAY_GRPC_ADDR"`
 	StorageAddress string `yaml:"storage_addr" env:"STORAGE_GRPC_ADDR"`
 
-	ServiceUserID    string `yaml:"service_user_id" env:"METADATA_SERVICE_USER_UUID"`
-	ServiceUserIDP   string `yaml:"service_user_idp" env:"METADATA_SERVICE_USER_IDP"`
+	SystemUserID     string `yaml:"system_user_id" env:"OCIS_SYSTEM_USER_ID;SETTINGS_SYSTEM_USER_ID"`
+	SystemUserIDP    string `yaml:"system_user_idp" env:"OCIS_SYSTEM_USER_IDP;SETTINGS_SYSTEM_USER_IDP"`
 	SystemUserAPIKey string `yaml:"system_user_api_key" env:"OCIS_SYSTEM_USER_API_KEY"`
 }
diff --git a/extensions/settings/pkg/config/defaults/defaultconfig.go b/extensions/settings/pkg/config/defaults/defaultconfig.go
index 236bad6f45a..01b7709e227 100644
--- a/extensions/settings/pkg/config/defaults/defaultconfig.go
+++ b/extensions/settings/pkg/config/defaults/defaultconfig.go
@@ -52,7 +52,7 @@ func DefaultConfig() *config.Config {
 		Metadata: config.Metadata{
 			GatewayAddress: "127.0.0.1:9215", // system storage
 			StorageAddress: "127.0.0.1:9215",
-			ServiceUserIDP: "internal",
+			SystemUserIDP:  "internal",
 		},
 	}
 }
@@ -93,8 +93,8 @@ func EnsureDefaults(cfg *config.Config) {
 		cfg.Metadata.SystemUserAPIKey = cfg.Commons.SystemUserAPIKey
 	}
 
-	if cfg.Metadata.ServiceUserID == "" && cfg.Commons != nil && cfg.Commons.SystemUserID != "" {
-		cfg.Metadata.ServiceUserID = cfg.Commons.SystemUserID
+	if cfg.Metadata.SystemUserID == "" && cfg.Commons != nil && cfg.Commons.SystemUserID != "" {
+		cfg.Metadata.SystemUserID = cfg.Commons.SystemUserID
 	}
 }
 
diff --git a/extensions/settings/pkg/store/metadata/store.go b/extensions/settings/pkg/store/metadata/store.go
index 7511c510e33..5f4a51c090a 100644
--- a/extensions/settings/pkg/store/metadata/store.go
+++ b/extensions/settings/pkg/store/metadata/store.go
@@ -84,7 +84,7 @@ func New(cfg *config.Config) settings.Manager {
 
 // NewMetadataClient returns the MetadataClient
 func NewMetadataClient(cfg config.Metadata) MetadataClient {
-	mdc, err := metadata.NewCS3Storage(cfg.GatewayAddress, cfg.StorageAddress, cfg.ServiceUserID, cfg.ServiceUserIDP, cfg.SystemUserAPIKey)
+	mdc, err := metadata.NewCS3Storage(cfg.GatewayAddress, cfg.StorageAddress, cfg.SystemUserID, cfg.SystemUserIDP, cfg.SystemUserAPIKey)
 	if err != nil {
 		log.Fatal("error connecting to mdc:", err)
 	}
diff --git a/extensions/sharing/pkg/config/config.go b/extensions/sharing/pkg/config/config.go
index 8926fcc731e..d7f70299ce2 100644
--- a/extensions/sharing/pkg/config/config.go
+++ b/extensions/sharing/pkg/config/config.go
@@ -95,8 +95,8 @@ type UserSharingOwnCloudSQLDriver struct {
 
 type UserSharingCS3Driver struct {
 	ProviderAddr     string `yaml:"provider_addr" env:"SHARING_USER_CS3_PROVIDER_ADDR"`
-	ServiceUserID    string `yaml:"service_user_id" env:"SHARING_USER_CS3_SERVICE_USER_ID"`
-	ServiceUserIDP   string `yaml:"service_user_idp" env:"OCIS_URL;SHARING_USER_CS3_SERVICE_USER_IDP"`
+	SystemUserID     string `yaml:"system_user_id" env:"OCIS_SYSTEM_USER_ID;SHARING_USER_CS3_SYSTEM_USER_ID"`
+	SystemUserIDP    string `yaml:"system_user_idp" env:"OCIS_SYSTEM_USER_IDP;SHARING_USER_CS3_SYSTEM_USER_IDP"`
 	SystemUserAPIKey string `yaml:"system_user_api_key" env:"OCIS_SYSTEM_USER_API_KEY;SHARING_USER_CS3_SYSTEM_USER_API_KEY"`
 }
 
@@ -125,8 +125,8 @@ type PublicSharingSQLDriver struct {
 
 type PublicSharingCS3Driver struct {
 	ProviderAddr     string `yaml:"provider_addr" env:"SHARING_PUBLIC_CS3_PROVIDER_ADDR"`
-	ServiceUserID    string `yaml:"service_user_id" env:"SHARING_PUBLIC_CS3_SERVICE_USER_ID"`
-	ServiceUserIDP   string `yaml:"service_user_idp" env:"OCIS_URL;SHARING_PUBLIC_CS3_SERVICE_USER_IDP"`
+	SystemUserID     string `yaml:"system_user_id" env:"OCIS_SYSTEM_USER_ID;SHARING_PUBLIC_CS3_SYSTEM_USER_ID"`
+	SystemUserIDP    string `yaml:"system_user_idp" env:"OCIS_SYSTEM_USER_IDP;SHARING_PUBLIC_CS3_SYSTEM_USER_IDP"`
 	SystemUserAPIKey string `yaml:"system_user_api_key" env:"OCIS_SYSTEM_USER_API_KEY;SHARING_USER_CS3_SYSTEM_USER_API_KEY"`
 }
 
diff --git a/extensions/sharing/pkg/config/defaults/defaultconfig.go b/extensions/sharing/pkg/config/defaults/defaultconfig.go
index c191a21d21f..68f0e27557b 100644
--- a/extensions/sharing/pkg/config/defaults/defaultconfig.go
+++ b/extensions/sharing/pkg/config/defaults/defaultconfig.go
@@ -39,8 +39,8 @@ func DefaultConfig() *config.Config {
 				File: filepath.Join(defaults.BaseDataPath(), "storage", "shares.json"),
 			},
 			CS3: config.UserSharingCS3Driver{
-				ProviderAddr:   "127.0.0.1:9215", // metadata storage
-				ServiceUserIDP: "internal",
+				ProviderAddr:  "127.0.0.1:9215", // metadata storage
+				SystemUserIDP: "internal",
 			},
 		},
 		PublicSharingDriver: "json", // "cs3",
@@ -49,8 +49,8 @@ func DefaultConfig() *config.Config {
 				File: filepath.Join(defaults.BaseDataPath(), "storage", "publicshares.json"),
 			},
 			CS3: config.PublicSharingCS3Driver{
-				ProviderAddr:   "127.0.0.1:9215", // metadata storage
-				ServiceUserIDP: "internal",
+				ProviderAddr:  "127.0.0.1:9215", // metadata storage
+				SystemUserIDP: "internal",
 			},
 		},
 		Events: config.Events{
@@ -104,16 +104,16 @@ func EnsureDefaults(cfg *config.Config) {
 		cfg.UserSharingDrivers.CS3.SystemUserAPIKey = cfg.Commons.SystemUserAPIKey
 	}
 
-	if cfg.UserSharingDrivers.CS3.ServiceUserID == "" && cfg.Commons != nil && cfg.Commons.SystemUserID != "" {
-		cfg.UserSharingDrivers.CS3.ServiceUserID = cfg.Commons.SystemUserID
+	if cfg.UserSharingDrivers.CS3.SystemUserID == "" && cfg.Commons != nil && cfg.Commons.SystemUserID != "" {
+		cfg.UserSharingDrivers.CS3.SystemUserID = cfg.Commons.SystemUserID
 	}
 
 	if cfg.PublicSharingDrivers.CS3.SystemUserAPIKey == "" && cfg.Commons != nil && cfg.Commons.SystemUserAPIKey != "" {
 		cfg.PublicSharingDrivers.CS3.SystemUserAPIKey = cfg.Commons.SystemUserAPIKey
 	}
 
-	if cfg.PublicSharingDrivers.CS3.ServiceUserID == "" && cfg.Commons != nil && cfg.Commons.SystemUserID != "" {
-		cfg.PublicSharingDrivers.CS3.ServiceUserID = cfg.Commons.SystemUserID
+	if cfg.PublicSharingDrivers.CS3.SystemUserID == "" && cfg.Commons != nil && cfg.Commons.SystemUserID != "" {
+		cfg.PublicSharingDrivers.CS3.SystemUserID = cfg.Commons.SystemUserID
 	}
 }
 
diff --git a/extensions/sharing/pkg/config/parser/parse.go b/extensions/sharing/pkg/config/parser/parse.go
index 9b12b8f56a6..dcd30fba825 100644
--- a/extensions/sharing/pkg/config/parser/parse.go
+++ b/extensions/sharing/pkg/config/parser/parse.go
@@ -42,7 +42,7 @@ func Validate(cfg *config.Config) error {
 		return shared.MissingSystemUserApiKeyError(cfg.Service.Name)
 	}
 
-	if cfg.PublicSharingDriver == "cs3" && cfg.PublicSharingDrivers.CS3.ServiceUserID == "" {
+	if cfg.PublicSharingDriver == "cs3" && cfg.PublicSharingDrivers.CS3.SystemUserID == "" {
 		return shared.MissingSystemUserID(cfg.Service.Name)
 	}
 
@@ -50,7 +50,7 @@ func Validate(cfg *config.Config) error {
 		return shared.MissingSystemUserApiKeyError(cfg.Service.Name)
 	}
 
-	if cfg.UserSharingDriver == "cs3" && cfg.UserSharingDrivers.CS3.ServiceUserID == "" {
+	if cfg.UserSharingDriver == "cs3" && cfg.UserSharingDrivers.CS3.SystemUserID == "" {
 		return shared.MissingSystemUserID(cfg.Service.Name)
 	}
 
diff --git a/extensions/sharing/pkg/revaconfig/config.go b/extensions/sharing/pkg/revaconfig/config.go
index a7099520d27..54411284b63 100644
--- a/extensions/sharing/pkg/revaconfig/config.go
+++ b/extensions/sharing/pkg/revaconfig/config.go
@@ -50,8 +50,8 @@ func SharingConfigFromStruct(cfg *config.Config) map[string]interface{} {
 						},
 						"cs3": map[string]interface{}{
 							"provider_addr":       cfg.UserSharingDrivers.CS3.ProviderAddr,
-							"service_user_id":     cfg.UserSharingDrivers.CS3.ServiceUserID,
-							"service_user_idp":    cfg.UserSharingDrivers.CS3.ServiceUserIDP,
+							"service_user_id":     cfg.UserSharingDrivers.CS3.SystemUserID,
+							"service_user_idp":    cfg.UserSharingDrivers.CS3.SystemUserIDP,
 							"machine_auth_apikey": cfg.UserSharingDrivers.CS3.SystemUserAPIKey,
 						},
 					},
@@ -75,8 +75,8 @@ func SharingConfigFromStruct(cfg *config.Config) map[string]interface{} {
 						},
 						"cs3": map[string]interface{}{
 							"provider_addr":       cfg.PublicSharingDrivers.CS3.ProviderAddr,
-							"service_user_id":     cfg.PublicSharingDrivers.CS3.ServiceUserID,
-							"service_user_idp":    cfg.PublicSharingDrivers.CS3.ServiceUserIDP,
+							"service_user_id":     cfg.PublicSharingDrivers.CS3.SystemUserID,
+							"service_user_idp":    cfg.PublicSharingDrivers.CS3.SystemUserIDP,
 							"machine_auth_apikey": cfg.PublicSharingDrivers.CS3.SystemUserAPIKey,
 						},
 					},