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Limiting Wildfly 14 Two-Way SSL to specific clients


Limiting Wildfly 14 Two-Way SSL to specific clients

By : Zheng Li
Date : November 29 2020, 04:01 AM
To fix the issue you can do I think you came to best conclusion. Elytron does not have possibility to choose SSL Context based on client parameters (What would that be? Client IP address? That can change when behind the load balancer.)
So I think only way is to have different SSLContext configured on different ports (or hostnames).
code :


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Is redis limiting the number of clients to 65K?

Is redis limiting the number of clients to 65K?


By : mitmak
Date : March 29 2020, 07:55 AM
this one helps. Are you running afoul of network port limitations? Depending on how the clients are closing the connections you could simply be running out of ports, as they will get stuck in the TIME_WAIT state.
If that is the case, one way to get around it is to bind multiple internal IP's to the server and distribute accordingly. Or alternately, if you can modify the client you're using, making sure that it closes the connection in such a way that it takes on the burden of TIME_WAIT.
Limiting Clients From Connecting

Limiting Clients From Connecting


By : Alex Francis
Date : March 29 2020, 07:55 AM
To fix this issue Forking creates a new instance of your proces, which also means that each variable is copied to the new process. Your initial total_connections will actually never get increased beyond 1.
C fork dealing with global variable
UserTransaction used by remote clients in WildFly

UserTransaction used by remote clients in WildFly


By : taihv01
Date : March 29 2020, 07:55 AM
I wish this help you Is it possible to lookup and use UserTransaction from a remote-client as in AS 4? , It's now deprecated. Better use:
code :
UserTransaction ut = RemoteTransactionContext.getInstance().getUserTransaction();
Limiting TCP Socket clients connection

Limiting TCP Socket clients connection


By : Mateciuc Catalina Ma
Date : March 29 2020, 07:55 AM
Does that help 1) I think your code, that closes connection, must be something like this:
code :
if (count < 3)
    pthread_create (&th[i], NULL, &treat, td);
else {
    shutdown( client, SHUT_RDWR );
    close( client );
}
printf("[SERVER] Waiting at port : %d\n", PORT);
fflush(stdout);
int length = sizeof(from);  
for( ; ; ) {
    int client;
    thData *td; //parameter executed by thread
    while ( count < 3 ) {
        if((client = accept (sd, (struct sockaddr *) &from, &length)) < 0 ) {
            perror ("[SERVER]Error at accept\n");
            continue;
        }
        count++;
        printf("Count : %d\n", count);
        //connection established
        int idThread; //thread id
        int cl;
        td = (struct thData*)malloc(sizeof(struct thData));
        td -> idThread = i++;
        td -> cl = client;
        pthread_create (&th[i], NULL, &treat, td);
        printf("Client descr : %d\n", client);
    }
    sleep(??);
}
Limiting Cassandra query syntax for clients

Limiting Cassandra query syntax for clients


By : Pawan
Date : March 29 2020, 07:55 AM
seems to work fine I would recommend to expose access via API, not via ODBC - at least you would have greater control on what is executed, and enforce tenant_id, and other checks, like limits, etc. You can try to utilize the Cassandra's CQL parser to decompose query, and put all required things back.
Theoretically, you can could utilize Apache Calcite, for example. It has implementation of JDBC driver that could be used, plus there is existing Cassandra adapter that you can modify to accomplish your task (mapping authentication into tenant_ids, etc.), but this will be quite a lot of work.
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