Fix for config corruption on Linux (Docker) after host crash / reboot

DnsServerCore/Auth/AuthManager.cs

@@ -337,6 +337,7 @@ private void SaveConfigFileInternal()
                 using (FileStream fS = new FileStream(tmpConfigFile, FileMode.Create, FileAccess.Write))
                 {
                     mS.CopyTo(fS);
+                    fS.Flush(flushToDisk: true);
                 }
             }
 

DnsServerCore/Cluster/ClusterManager.cs

@@ -296,6 +296,7 @@ private void SaveConfigFileInternal()
                 using (FileStream fS = new FileStream(tmpConfigFile, FileMode.Create, FileAccess.Write))
                 {
                     mS.CopyTo(fS);
+                    fS.Flush(flushToDisk: true);
                 }
             }
 

DnsServerCore/Dhcp/DhcpServer.cs

@@ -1282,6 +1282,7 @@ private void SaveScopeFile(Scope scope)
                     using (FileStream fS = new FileStream(tmpScopeFile, FileMode.Create, FileAccess.Write))
                     {
                         mS.CopyTo(fS);
+                        fS.Flush(flushToDisk: true);
                     }
                 }
 

DnsServerCore/Dns/Applications/DnsApplication.cs

@@ -243,7 +243,13 @@ public async Task SetConfigAsync(string config)
             {
                 string tmpConfigFile = Path.Combine(_dnsServer.ApplicationFolder, "dnsApp.tmp");
 
-                await File.WriteAllTextAsync(tmpConfigFile, config);
+                await using (FileStream fS = new FileStream(tmpConfigFile, FileMode.Create, FileAccess.Write))
+                {
+                    byte[] configBytes = System.Text.Encoding.UTF8.GetBytes(config);
+                    await fS.WriteAsync(configBytes);
+                    await fS.FlushAsync();
+                    fS.Flush(flushToDisk: true);
+                }
 
                 File.Move(tmpConfigFile, configFile, true);
             }

DnsServerCore/Dns/DnsServer.cs

@@ -619,6 +619,7 @@ internal void SaveConfigFileInternal()
                 using (FileStream fS = new FileStream(tmpConfigFile, FileMode.Create, FileAccess.Write))
                 {
                     mS.CopyTo(fS);
+                    fS.Flush(flushToDisk: true);
                 }
             }
 

DnsServerCore/Dns/ZoneManagers/AllowedZoneManager.cs

@@ -168,6 +168,7 @@ private void SaveZoneFileInternal()
             using (FileStream fS = new FileStream(tmpAllowedZoneFile, FileMode.Create, FileAccess.Write))
             {
                 WriteConfigTo(fS);
+                fS.Flush(flushToDisk: true);
             }
 
             File.Move(tmpAllowedZoneFile, allowedZoneFile, true);

DnsServerCore/Dns/ZoneManagers/AuthZoneManager.cs

@@ -303,6 +303,7 @@ private void SaveZoneFileInternal(string zoneName)
                 using (FileStream fS = new FileStream(tmpZoneFile, FileMode.Create, FileAccess.Write))
                 {
                     mS.CopyTo(fS);
+                    fS.Flush(flushToDisk: true);
                 }
             }
 

DnsServerCore/Dns/ZoneManagers/BlockListZoneManager.cs

@@ -206,6 +206,7 @@ private void SaveConfigFileInternal()
                 using (FileStream fS = new FileStream(tmpBlockListConfigFile, FileMode.Create, FileAccess.Write))
                 {
                     mS.CopyTo(fS);
+                    fS.Flush(flushToDisk: true);
                 }
             }
 

DnsServerCore/Dns/ZoneManagers/BlockedZoneManager.cs

@@ -184,6 +184,7 @@ private void SaveZoneFileInternal()
             using (FileStream fS = new FileStream(tmpBlockedZoneFile, FileMode.Create, FileAccess.Write))
             {
                 WriteConfigTo(fS);
+                fS.Flush(flushToDisk: true);
             }
 
             File.Move(tmpBlockedZoneFile, blockedZoneFile, true);

DnsServerCore/DnsWebService.cs

@@ -379,6 +379,7 @@ private void SaveConfigFileInternal()
                 using (FileStream fS = new FileStream(tmpConfigFile, FileMode.Create, FileAccess.Write))
                 {
                     mS.CopyTo(fS);
+                    fS.Flush(flushToDisk: true);
                 }
             }
 

DnsServerCore/LogManager.cs

@@ -330,6 +330,7 @@ private void SaveConfigFileInternal()
                 using (FileStream fS = new FileStream(tmpLogConfigFile, FileMode.Create, FileAccess.Write))
                 {
                     mS.CopyTo(fS);
+                    fS.Flush(flushToDisk: true);
                 }
             }