amazon web services – Do I need 1 RDS Cluster for each DB or a single RDS Cluster for all my DBs?

Let’s suppose I have 5 databases I’m going to use in my application. The application will be used by +100k users. I’m planning to use RDS Cluster with Aurora PostgreSQL. What would be best?

Create 1 cluster for each DB, I’ll end up with 5 clusters, which I think is good for performance but with a higher cost.

OR

Create a single cluster with enough resources(CPU, RAM, etc.) that will contain the 5 databases in it.

Need Refactoring Services – Software Engineering Stack Exchange

I’ve spent hours on the internet without much luck. Thought I would tap into the collective.

Mu company has a program that is in serious need of refactoring. It’s a deep engineering and predictive analysis desktop program that includes lots of Fortran (two versions), C++, and C# all balled together. It’s been pieced together by a dozen different engineers and programmers for decades and now needs real, special attention. We would like to get it completely into C# for the future. Not my choice of language, but it’s too late now.

I can’t seem to find anyone qualified that would take on such a project. I can see it taking someone from a qualified company well over a year to get it straightened out. They need to at least be USA-based, mid-west preferably, non-disclosure agreement required. Looking for recommendations for companies that might be able to help, thanks.

windows server 2019 – Exclude directories from roaming profile for terminal services

I have a question regarding exclusions from roaming Terminal Services profiles.

The following GPO manages exclusions from roaming the ordinary profile:`

User ConfigurationAdministrative TemplatesSystemUser ProfilesExclude directories in roaming profile

But it does not apply for the Terminal Services Profile, unfortunately.

Is there another GPO for managing the same type of exclusions, but for Terminal Services?

If not, are there other ways to achieve the same effect?

We only recently learned about User Profile Disks, which could perhaps solve the problem in another way, but we would then have to do extensive testing before converting.

Windows Server 2019.

Regards Niels Jespersen

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amazon web services – On AWS during DS record creation I get an error, DS record with DNS name ex.com not permitted in zone ex.com. Why might this be?

Environment: AWS, DNSSEC

When I attempt to create a DS record to establish a chain of trust I get an error that I don’t understand.

My full error.

Error occurred
Bad request.
(InvalidChangeBatch 400: RRSet of type DS with DNS name example.com. is not permitted in zone example.com.)

Oddly enough when I attempt to add the key to a subdomain like www.example.com it works. But that’s not what I need. I need it to work for the entire domain.

aws – Best choice of Amazon services for deployment of a video processing mobile app

I need help to decide on the backend infrastructure for our senior design project. We will build a mobile application (on Flutter) where users record videos and/or audio of themselves and get emotion/mood predictions. However, I did some research about this, and, as far I see, video streaming might be time-consuming if we consider recording, sending to the backend, and then process to get a prediction.

Briefly, we will have an ML model, a Node.js RESTful API, and a Flutter mobile app at the end. Also, we plan to deploy our project on AWS. I want to ask which services should we use to design a performant backend?

I found the Kinesis Video Streaming (KVS) service of AWS, but I do not know if it is a good choice. Also, I do not know how to process videos coming from that service.

If someone can give me a simple idea of software architecture, I would be glad to hear about it.

WCF services doesn’t require auth

I have created a WCF service endpoint for SharePoint, deployed in ISAPI and even if anonymous access is disabled, the service can still be consumed without authentication/authorization.

Why this behavior ?

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amazon web services – L2TP Issues AWS EC2

I’m trying to set up l2tp inside an AWS VPC, I’m having problems.

I’m on a MAC OS and I keep getting an error “A connection could not be established to the PPP server. Try reconnecting. If the problem continues, verify your settings and contact your Administrator.” Other l2tp connections from the Mac work so I’m thinking it’s a server-side configuration issue having to do with AWS networking.

The server does have an EIP and the Security Group is open for the traffic. I have set UDP encapsulation as well, but no joy.

Here’s the log from my Mac:

Tue Mar  2 21:06:53 2021 : publish_entry SCDSet() failed: Success!
Tue Mar  2 21:06:53 2021 : publish_entry SCDSet() failed: Success!
Tue Mar  2 21:06:53 2021 : l2tp_get_router_address
Tue Mar  2 21:06:53 2021 : l2tp_get_router_address 172.20.10.1 from dict 1
Tue Mar  2 21:06:53 2021 : L2TP connecting to server 'XXXXXXXXXXXX' (XX.XX.XX.XXX)...
Tue Mar  2 21:06:53 2021 : IPSec connection started
Tue Mar  2 21:06:53 2021 : IPSec phase 1 client started
Tue Mar  2 21:06:53 2021 : IPSec phase 1 server replied
Tue Mar  2 21:06:54 2021 : IPSec phase 2 started
Tue Mar  2 21:06:54 2021 : IPSec phase 2 established
Tue Mar  2 21:06:54 2021 : IPSec connection established
Tue Mar  2 21:06:54 2021 : L2TP sent SCCRQ
Tue Mar  2 21:06:54 2021 : L2TP received SCCRP
Tue Mar  2 21:06:54 2021 : L2TP sent SCCCN
Tue Mar  2 21:06:54 2021 : L2TP sent ICRQ
Tue Mar  2 21:06:54 2021 : L2TP received ICRP
Tue Mar  2 21:06:54 2021 : L2TP sent ICCN
Tue Mar  2 21:06:54 2021 : L2TP connection established.
Tue Mar  2 21:06:54 2021 : L2TP set port-mapping for en0, interface: 6, protocol: 0, privatePort: 0
Tue Mar  2 21:06:54 2021 : using link 0
Tue Mar  2 21:06:54 2021 : Using interface ppp0
Tue Mar  2 21:06:54 2021 : Connect: ppp0 <--> socket(34:18)
Tue Mar  2 21:06:54 2021 : sent (LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0x312e33e6> <pcomp> <accomp>)
Tue Mar  2 21:06:57 2021 : sent (LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0x312e33e6> <pcomp> <accomp>)
Tue Mar  2 21:06:57 2021 : rcvd (LCP ConfReq id=0x0 <mru 1400> <auth eap> <magic 0x7ad21b17> <pcomp> <accomp> <callback CBCP> <mrru 1614> <endpoint 13 17 01 4f 48 20 23 13 c3 46 18 8f aa 74 9e ef 65 fe 3a 00 00 00 00>)
Tue Mar  2 21:06:57 2021 : lcp_reqci: rcvd unknown option 13
Tue Mar  2 21:06:57 2021 : lcp_reqci: returning CONFREJ.
Tue Mar  2 21:06:57 2021 : sent (LCP ConfRej id=0x0 <callback CBCP> <mrru 1614>)
Tue Mar  2 21:06:57 2021 : rcvd (LCP ConfAck id=0x1 <asyncmap 0x0> <magic 0x312e33e6> <pcomp> <accomp>)
Tue Mar  2 21:06:57 2021 : rcvd (LCP ConfReq id=0x1 <mru 1400> <auth eap> <magic 0x7ad21b17> <pcomp> <accomp> <endpoint 13 17 01 4f 48 20 23 13 c3 46 18 8f aa 74 9e ef 65 fe 3a 00 00 00 00>)
Tue Mar  2 21:06:57 2021 : lcp_reqci: returning CONFNAK.
Tue Mar  2 21:06:57 2021 : sent (LCP ConfNak id=0x1 <auth chap MS-v2>)
Tue Mar  2 21:06:57 2021 : rcvd (LCP ConfReq id=0x2 <mru 1400> <auth chap MS-v2> <magic 0x7ad21b17> <pcomp> <accomp> <endpoint 13 17 01 4f 48 20 23 13 c3 46 18 8f aa 74 9e ef 65 fe 3a 00 00 00 00>)
Tue Mar  2 21:06:57 2021 : lcp_reqci: returning CONFACK.
Tue Mar  2 21:06:57 2021 : sent (LCP ConfAck id=0x2 <mru 1400> <auth chap MS-v2> <magic 0x7ad21b17> <pcomp> <accomp> <endpoint 13 17 01 4f 48 20 23 13 c3 46 18 8f aa 74 9e ef 65 fe 3a 00 00 00 00>)
Tue Mar  2 21:06:57 2021 : sent (LCP EchoReq id=0x0 magic=0x312e33e6)
Tue Mar  2 21:06:58 2021 : rcvd (CHAP Challenge id=0x0 <74364045b7347b39c5b1dfc36728e117>, name = "XXX")
Tue Mar  2 21:06:58 2021 : sent (CHAP Response id=0x0 <734347e818645e3291e5aadb64eba088000000000000000068b867912db9f4098b52051c0e350df91af72a1774b6708700>, name = "XXXXX")
Tue Mar  2 21:06:58 2021 : rcvd (LCP EchoRep id=0x0 magic=0x7ad21b17)
Tue Mar  2 21:06:58 2021 : rcvd (CHAP Success id=0x0 "S=FB69C2CC6DD794FF835AF55ED91E9DBAB6278C81")
Tue Mar  2 21:06:58 2021 : sent (IPCP ConfReq id=0x1 <addr 0.0.0.0> <ms-dns1 0.0.0.0> <ms-dns3 0.0.0.0>)
Tue Mar  2 21:06:58 2021 : sent (IPV6CP ConfReq id=0x1 <addr fe80::167d:daff:fece:57fd>)
Tue Mar  2 21:06:58 2021 : sent (ACSCP ConfReq id=0x1 <route vers 16777216> <domain vers 16777216>)
Tue Mar  2 21:06:58 2021 : rcvd (CCP ConfReq id=0x4 <mppe +H -M -S -L -D +C>)
Tue Mar  2 21:06:58 2021 : Unsupported protocol 'Compression Control Protocol' (0x80fd) received
Tue Mar  2 21:06:58 2021 : sent (LCP ProtRej id=0x2 80 fd 01 04 00 0a 12 06 01 00 00 01)
Tue Mar  2 21:06:58 2021 : rcvd (LCP ProtRej id=0x5 80 21 01 01 00 16 03 06 00 00 00 00 81 06 00 00 00 00 83 06 00 00 00 00)
Tue Mar  2 21:06:58 2021 : rcvd (LCP ProtRej id=0x6 80 57 01 01 00 0e 01 0a 16 7d da ff fe ce 57 fd)
Tue Mar  2 21:06:58 2021 : rcvd (LCP ProtRej id=0x7 82 35 01 01 00 10 01 06 00 00 00 01 02 06 00 00 00 01)
Tue Mar  2 21:06:58 2021 : sent (LCP TermReq id=0x3 "No network protocols running")
Tue Mar  2 21:06:58 2021 : Connection terminated.
Tue Mar  2 21:06:58 2021 : L2TP disconnecting...
Tue Mar  2 21:06:58 2021 : L2TP sent CDN
Tue Mar  2 21:06:58 2021 : L2TP sent StopCCN
Tue Mar  2 21:06:58 2021 : L2TP clearing port-mapping for en0
Tue Mar  2 21:06:58 2021 : L2TP disconnected

Here’s the logs from the Windows server:

"XXX","RAS",03/02/2021,21:07:24,4,"XXXXXX",,"XX.XX.XX.XX","XX.XX.XX.XX",,,"XXX","XXXXX",1,,"XX.XX.XX.XX","XXX",1614737244,,5,,1,2,,,0,"311 1 fe80::edb8:9338:cb73:6adf 03/03/2021 01:54:30 4",,,,,1,,,,"5",2,,,,,"7",1,,3,1,"174.247.13.222","XX.XX.XX.XX",,,,,,,"MSRASV5.20",311,,"0x00504545524C455353",4,,"Microsoft Routing and Remote Access Service Policy",1,,,,
"XXX","RAS",03/02/2021,21:07:26,4,"XXXXX",,"XX.XX.XX.XX","XX.XX.XX.XX",,,"XXX","XX.XX.XX.XX",1,,"XX.XX.XX.XX","XX.XX.XX.XX",1614737244,,5,,1,2,,,0,"311 1 fe80::edb8:9338:cb73:6adf 03/03/2021 01:54:30 4",,,,,2,,292,407,"5",2,0,11,13,1,"7",1,,3,1,"174.247.13.222","XX.XX.XX.XX",,,,,,,"MSRASV5.20",311,,"0x00504545524C455353",4,,"Microsoft Routing and Remote Access Service Policy",1,,,,

I am totally stumped on this.

dependency injection – Using Autofac with static services class

I am using Autofac to maximise the sharing of code between Android and iOS via a shared PCL assembly in a Xamarin (native) environment. The shared service layer consists of four interfaces to classes containing methods or data that don’t change throughout the lifetime of the application.

Instead of resolving the service classes from the Autofac singleton container at every point of use, I’ve thought of creating a class of static references to the services.

I would like to know whether there is something intrinsically wrong with this approach (e.g. memory leaks), or if there is some better suggestion someone could make.

This is the gist:

Android (& equivalent iOS):

public class BootStrap
{
    private static IContainer container = null;
    public static IContainer Container()
    {
        if (container == null)
        {
            ContainerBuilder builder = new ContainerBuilder();
            builder.RegisterType<CacheFactory>().SingleInstance().As<ICacheFactory>(); ;
            builder.RegisterType<ClientFactory>().SingleInstance().As<IClientFactory>();
            builder.RegisterType<CoreHelpers>().SingleInstance().As<ICoreHelpers>();
            builder.RegisterType<PrefsSerializer>().SingleInstance().As<IPrefsSerializer>();
            builder.RegisterType<Services>().SingleInstance();
            container = builder.Build();
        }
        return container;
    }
}

public class MainApp
{
    private ILifetimeScope RootScope;

    public MainApp
    {
        RootScope = BootStrap.Container().BeginLifetimeScope();         // register types, return container
        RootScope.Resolve<Services>();                                  // set static Services members
    }

    ~MainApp()
    {
        RootScope.Dispose();
    }
}

Shared Assembly:

public class Services
{
    public static ICacheFactory CacheFactory;       // data and methods
    public static IClientFactory ClientFactory;     // data and methods
    public static ICoreHelpers CoreHelpers;         // methods only
    public static IPrefsSerializer PrefsHelper;     // methods only

    public Services(ICacheFactory _cacheFactory, IClientFactory _clientFactory, ICoreHelpers _coreHelpers, IPrefsSerializer _prefsHelper)
    {
        CacheFactory = _cacheFactory;
        ClientFactory = _clientFactory;
        CoreHelpers = _coreHelpers;
        PrefsHelper = _prefsHelper;
    }
}

Usage:

Services.CacheFactory.GetCache().DoSomething();
UserClient user = Services.ClientFactory.GetUserClient();
...