Send command to kubernetes pod

help
1

Hi,

I'm trying to send commands to a kubernetes pod. but i'm not sure if i'm using the correct procedure.
libraries:

Cargo.toml

kube = { version = "0.83.0", features = ["client"] }
k8s-openapi = { version = "0.18.0", features = ["v1_26"] }

    use k8s_openapi::api::core::v1::{ConnectGetPodExecOptional, ConnectPostPodExecOptional, Container, ExecAction, Pod};
    //create kubernetes configuration.
    //path to kubeconfig file.
    let kube_config_path = matches.value_of("kube_config_path").unwrap();
    //create kubeconfig.
    let kube_config = Kubeconfig::read_from(kube_config_path).unwrap();
    //options for the kubernetes configuration.
    let kube_config_options = KubeConfigOptions {
        //context name.
        context: Some(context_name),
        //cluster name.
        cluster: None,
        //user name.
        user: None,
    };
    //create kubernetes configuration.
    let k_config = Config::from_custom_kubeconfig(kube_config, &kube_config_options).await.unwrap();
   
    //create kubernetes client.
    let client = Client::try_from(k_config).expect("Expected a valid KUBECONFIG environment variable.");

    let exec_cfg = Pod::connect_get_exec(
        "titan-ecs-default-6d6d875489-dk8l2",
        &context_namespace,
        ConnectGetPodExecOptional{
            command: Some(&["/bin/sh".to_string(), "-c".to_string(), "ls -lrtha /tmp/".to_string()]),
            container: Some("evolved-capture-service"),
            stderr: Some(true),
            stdin: None,
            stdout: Some(true),
            tty: None,
        },
    ).unwrap();
    let exec_to_pod = client.request(exec_cfg);

//ERROR

error[E0698]: type inside `async` block must be known in this context
   --> src/main.rs:111:30
    |
111 |     let exec_to_pod = client.request(exec_cfg);
    |                              ^^^^^^^ cannot infer type for type parameter `T` declared on the method `request`
    |
    note: the type is part of the `async` block because of this `await`
     --> src/main.rs:112:34
    |
112 |     let exec_to_pod = exec_to_pod.await.unwrap();
    |                                  ^^^^^^

if a print the exec_cfg.

exec_cfg: Request { method: GET, uri: /api/v1/namespaces/titan-ns/pods/titan-ecs-default-6d6d875489-dk8l2/exec?&command=%2Fbin%2Fsh&command=-c&command=ls+-lrtha+%2Ftmp%2F&container=evolved-capture-service&stderr=true&stdout=true, version: HTTP/1.1, headers: {}, body: [] }
2

Please format your post properly and add sufficient context. A 12-line code dump with no description as to its dependencies, goal, and any errors you get doesn't allow anyone to infer what the problem and the solution might be.

3

Sorry ill already add more information.

4

Hi, quote blocks are not the right tool for formatting code blocks.

See this topic for more information: Forum Code Formatting and Syntax Highlighting

For now, I’ve fixed your post for you.

2 Likes
5

You need to specify what sort of data you're expecting to receive from the request. client.request::<BodyDataTypeGoesHere>(exec_cfg);

6

Thanks!! now i have another error.

    #[derive(Default, Debug, Clone, PartialEq, Serialize, Deserialize)]
    pub struct Result {
    pub kind: String,
    #[serde(rename = "apiVersion")]
    pub api_version: String,
    pub metadata: Metadata,
    pub status: String,
    pub message: String,
    pub reason: String,
    pub code: i64,
}

#[derive(Default, Debug, Clone, PartialEq, Serialize, Deserialize)]
pub struct Metadata {
}
    let exec_to_pod = client.request::<Result>(exec_cfg).await.unwrap();
    println!("exec_to_pod: {:?}", exec_to_pod);

ERROR

{
  "kind": "Status",
  "apiVersion": "v1",
  "metadata": {},
  "status": "Failure",
  "message": "Upgrade request required",
  "reason": "BadRequest",
  "code": 400
}

Websocket connection
i need to pass curl -H "Connection: upgrade" -H "Upgrade: SPDY/3.1" {master url:port/pod/exec}
you know if i im in a good path?

7

I was able to communicate with the pod. i send touch command to create a dummy file and works!!

command: Some(&["/bin/sh".to_string(), "-c".to_string(), "touch /tmp/sebas.log".to_string()])

image
image737×234 18.1 KB

use ws::connect;
let exec_to_pod = client.connect(exec_cfg).await.unwrap();

I need now to get the stdout and the stderr.

print!("exec_to_pod: {:?}", exec_to_pod);
exec_to_pod: WebSocketStream { inner: WebSocket { socket: AllowStd { inner: Upgraded, write_waker_proxy: WakerProxy { read_waker: AtomicWaker, write_waker: AtomicWaker }, read_waker_proxy: WakerProxy { read_waker: AtomicWaker, write_waker: AtomicWaker } }, context: WebSocketContext { role: Client, frame: FrameCodec { in_buffer: ReadBuffer { storage: Cursor { inner: [], pos: 0 }, chunk: [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0] }, out_buffer: [], header: None }, state: Active, incomplete: None, send_queue: [], pong: None, config: WebSocketConfig { max_send_queue: None, max_message_size: Some(67108864), max_frame_size: Some(16777216), accept_unmasked_frames: false } } }, closing: false, ended: false }
8

Provide a git clone URL.

9

Finally after test a lot i get the output. attached the code if someone need it.

    let ap = kube::api::AttachParams{
        container: Some("evolved-capture-service".to_string()),
        stderr: true,
        stdin: false,
        stdout: true,
        tty: false,
        ..Default::default()
    };

    let command = ["/bin/sh", "-c", "ls -lh /tmp/"];
    // iteraotr for the command.
    //pod Name.
    let name = "titan-ecs-default-6d6d875489-rcvdf";
    //add join to the attach process.
    let mut result: AttachedProcess= pods.exec(name, command, &ap).await.unwrap();
    let mut result = result.stdout().unwrap();
    let mut buf = String::new();
    result.read_to_string(&mut buf).await.unwrap();
    
    //from string to vector.
    let mut vec: Vec<&str> = buf.split("\n").collect();

    //remove the last element of the vector.
    vec.pop();

    //remove the first element of the vector.
    vec.remove(0);

    for i in 0..vec.len() {
        println!("{}", vec[i]);
    }
10

git link

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