Can't connect to the node

ScyllaDB
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1

hello, I am new to scylla (and docker so maybe the problem is with my docker command )
I am trying to connect from my rust code to the scylla node that I run from docker
my docker command is docker run --name some-scylla -d scylladb/scylla --smp 1
and I simply have this fn to connect

/// Connect to a Scylla node
pub async fn connect_scylla_node(node: SocketAddr) -> Arc<Session> {
    let client = SessionBuilder::new()
        .known_node_addr(node)
        // .compression(Some(scylla::frame::Compression::Lz4))
        // .user("cassandra", "cassandra")
        .build()
        .await
        .unwrap();
    Arc::new(client)

}

and it giving me always this error

called `Result::unwrap()` on an `Err` value: ConnectionPoolError(Broken { last_connection_error: ConnectTimeout })
2

I forgot to mention
I pass this socket_addr

pub const A: SocketAddr = SocketAddr::V4(SocketAddrV4::new(Ipv4Addr::new(172, 17, 0, 2), 9042));
3

so I seems to fix the connection by running this docker command

docker run  --name scyllnw --rm -it -p 9042:9042 scylladb/scylla --smp 2

and changed the socket_addr to localhost

but now I am wondering why I couldn’t connect to the private ip I got from the docker vm ? it in my network .
it seems I need use the docker port mapping .

4

What operating system do you use?
Do you use docker or podman?

5

I am using macOS, and docker

6

This is a known behavior of docker on MacOS and Windows - you can’t connect to internal docker IPs from outside on those systems.

7

so even if it private ip I have to map it to my address to communicate with the container?

8

Alternatively you could also run your application in the docker container.

9

that an option too,
thank you for helping me out !

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10

Private IP likely failed due to Docker’s networking isolation.

1 Like