Hi @ancient-wolf-19325 in podspec if we use some docker image and didn't mentioned any arguments will it run automatically based on its entrypoint?

It seems likely that if you specify a Docker image in a Flyte pod spec and do not provide any arguments, the container will run using its default ENTRYPOINT and CMD as defined in the Docker image. Flyte only injects its own command/args if you use Flyte tasks with the Python SDK; if you define a pod spec directly (e.g., with

containers=<https://github.com/flyteorg/flytesnacks/blob/master/examples/k8s_pod_plugin/k8s_pod_plugin/pod.py|...]

and no

args

), Kubernetes will use the image's default entrypoint and command as per standard Kubernetes behavior. This is also reflected in Flyte's pod plugin examples, where omitting

args

in the container spec results in the image's entrypoint being used by default, unless Flyte needs to inject its own execution logic for Python tasks (in which case it overrides the command) ([pod.py example>). Would you like more detail or a code example? Sources: - pod.py example 👍 0 button 👎 0 button 💡 Hint: Mention @runllm in the thread for followups.

that means if we didn't mention arguments it will use image's default entrypoint? @ancient-wolf-19325

Yes, if you do not specify arguments in the pod spec, Kubernetes (and thus Flyte) will use the image's default ENTRYPOINT and CMD as defined in the Docker image (pod.py example). This is standard Kubernetes behavior and applies when Flyte does not override the command for its own task execution. Would you like a step-by-step explanation or a code sample? Sources: - pod.py example 👍 0 button 👎 0 button 💡 Hint: Mention @runllm in the thread for followups.

yeds

My understanding is that, step-by-step, the behavior is as follows: 1. Kubernetes PodSpec Behavior: When you define a

V1Container

in a Kubernetes

PodSpec

(which Flyte uses under the hood), if you do not specify the

command

or

args

fields, Kubernetes will run the container using the image's default

ENTRYPOINT

and

CMD

(Kubernetes docs, also reflected in Flyte's pod plugin usage). 2. Flyte Pod Tasks: In Flyte, if you use the pod plugin or pod templates and define a container without

command

or

args

, Flyte passes this spec directly to Kubernetes. Unless Flyte needs to inject its own execution logic (as it does for Python tasks), the container will start with the image's default entrypoint (pod.py example). 3. Override Behavior: If you do specify

command

or

args

in the pod spec, these will override the image's defaults. Example:

from kubernetes.client import V1Container, V1PodSpec
import flyte

pod_template = flyte.PodTemplate(
    primary_container_name="primary",
    pod_spec=V1PodSpec(
        containers=[
            V1Container(
                name="primary",
                image="ubuntu:latest"  # No command or args specified
            )
        ]
    )
)

In this example, the

ubuntu:latest

image will run with its default entrypoint (usually

/bin/bash

or

/bin/sh

), unless overridden (pod.py example). Sources: - pod.py example 👍 0 button 👎 0 button 💡 Hint: Mention @runllm in the thread for followups.

suppose default entrypoint is /workspace/run.sh now i specifying in arguments sleep 1000 what will happens @ancient-wolf-19325

The Flyte documentation I have ingested does not mention how specifying arguments in a pod spec interacts with a Docker image's default entrypoint, such as if the entrypoint is

/workspace/run.sh

and you specify

args

like

sleep 1000

. In Kubernetes (and thus in Flyte pod specs), if you specify

args

but not

command

, the container will use the image's default ENTRYPOINT (

/workspace/run.sh

) and pass your specified arguments (

sleep 1000

) to it, so the container will effectively run

/workspace/run.sh sleep 1000

. If your entrypoint script is designed to handle and forward those arguments, it will process them accordingly. If you want more precise behavior, please clarify whether you are using Flyte's pod plugin, a custom pod template, or a standard Flyte Python task. If this doesn't help, please reach out to the Flyte support team for further assistance. 👍 0 button 👎 0 button 💡 Hint: Mention @runllm in the thread for followups.

now i understand if we directly specify args without command then entrypoing with args will work if we specify with command and args, entrypoint will won't run? @ancient-wolf-19325

Correct. If you specify only

args

, Kubernetes (and thus Flyte) uses the image's ENTRYPOINT with your

args

appended (i.e., ENTRYPOINT + ARGS). If you specify both

command

and

args

, the

command

replaces the ENTRYPOINT, and

args

are appended to it—so the image's ENTRYPOINT is ignored (Kubernetes docs; pod.py example). Would you like a code example to illustrate this? Sources: - pod.py example 👍 0 button 👎 0 button 💡 Hint: Mention @runllm in the thread for followups.

could you please provide an example @ancient-wolf-19325

Certainly! Here’s a Flyte pod template example showing both cases: Case 1: Only args specified (ENTRYPOINT runs with args):

from kubernetes.client import V1Container, V1PodSpec
import flyte

pod_template = flyte.PodTemplate(
    primary_container_name="primary",
    pod_spec=V1PodSpec(
        containers=[
            V1Container(
                name="primary",
                image="my-image:latest",  # ENTRYPOINT is /workspace/run.sh
                args=["sleep", "1000"],   # Runs: /workspace/run.sh sleep 1000
            )
        ]
    )
)

Case 2: Both command and args specified (ENTRYPOINT ignored):

from kubernetes.client import V1Container, V1PodSpec
import flyte

pod_template = flyte.PodTemplate(
    primary_container_name="primary",
    pod_spec=V1PodSpec(
        containers=[
            V1Container(
                name="primary",
                image="my-image:latest",
                command=["echo"],         # ENTRYPOINT ignored, runs: echo sleep 1000
                args=["sleep", "1000"],
            )
        ]
    )
)

In the first case, the image’s ENTRYPOINT is used; in the second, it is replaced by the specified command (pod.py example). Sources: - pod.py example 👍 0 button 👎 0 button 💡 Hint: Mention @runllm in the thread for followups.

Thanks got it @ancient-wolf-19325

You're welcome! If you have any more questions about Flyte, Kubernetes pods, or workflow orchestration, feel free to ask. Happy building with Flyte! 🚀 👍 0 button 👎 0 button 💡 Hint: Mention @runllm in the thread for followups.