PLT-2899 adding clustering of app servers (#3682)

* PLT-2899 adding clustering of app servers

* PLT-2899 base framework

* PLT-2899 HA backend

* PLT-2899 Fixing config file

* PLT-2899 adding config syncing

* PLT-2899 set System console to readonly when clustering enabled.

* PLT-2899 Fixing publish API

* PLT-2899 fixing strings

model/config.go

@@ -80,6 +80,12 @@ type ServiceSettings struct {
 	RestrictCustomEmojiCreation       *string
 }
 
+type ClusterSettings struct {
+	Enable                 *bool
+	InterNodeListenAddress *string
+	InterNodeUrls          []string
+}
+
 type SSOSettings struct {
 	Enable          bool
 	Secret          string
@@ -297,6 +303,7 @@ type Config struct {
 	LocalizationSettings LocalizationSettings
 	SamlSettings         SamlSettings
 	NativeAppSettings    NativeAppSettings
+	ClusterSettings      ClusterSettings
 }
 
 func (o *Config) ToJson() string {
@@ -707,6 +714,20 @@ func (o *Config) SetDefaults() {
 		*o.ServiceSettings.RestrictCustomEmojiCreation = RESTRICT_EMOJI_CREATION_ALL
 	}
 
+	if o.ClusterSettings.InterNodeListenAddress == nil {
+		o.ClusterSettings.InterNodeListenAddress = new(string)
+		*o.ClusterSettings.InterNodeListenAddress = ":8075"
+	}
+
+	if o.ClusterSettings.Enable == nil {
+		o.ClusterSettings.Enable = new(bool)
+		*o.ClusterSettings.Enable = false
+	}
+
+	if o.ClusterSettings.InterNodeUrls == nil {
+		o.ClusterSettings.InterNodeUrls = []string{}
+	}
+
 	if o.ComplianceSettings.Enable == nil {
 		o.ComplianceSettings.Enable = new(bool)
 		*o.ComplianceSettings.Enable = false