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argo restful api get workflow pod name

argo restful api get workflow pod name

2 min read 05-02-2025
argo restful api get workflow pod name

Getting Argo Workflows Pod Names via the RESTful API

This article details how to retrieve the names of pods associated with a specific Argo Workflow using its RESTful API. We'll cover the necessary API calls, authentication methods, and potential error handling. Understanding this process is crucial for monitoring workflow execution and interacting with individual pods.

Understanding Argo Workflows and Pods

Argo Workflows orchestrates complex workflows by breaking them down into individual steps, often represented as containers running within Kubernetes pods. Accessing pod information is vital for troubleshooting, logging, and resource management.

Accessing the Argo Workflows API

The Argo Workflows API provides endpoints for managing and monitoring workflows. The specific URL will depend on your Argo installation, usually something like http://<your-argo-server>:<port>/api/v1. You'll need to replace <your-argo-server> and <port> with your actual Argo server address and port. Often, port 2746 is used.

Authentication

Authentication methods vary depending on your Argo setup. Common methods include:

  • Token-based authentication: This typically involves obtaining an API token and including it in the Authorization header of your API requests (e.g., Authorization: Bearer <your_token>).
  • Kubernetes service account: If running within a Kubernetes cluster, leveraging a service account with appropriate permissions can provide seamless authentication.

Refer to your Argo installation's documentation for specific authentication instructions.

Retrieving Pod Names: A Step-by-Step Guide

This example uses curl for demonstration; adapt it to your preferred HTTP client. Replace placeholders with your actual values.

1. Get Workflow Information:

First, you need the workflow's unique name and namespace. Use the following curl command to fetch workflow details:

curl -H "Authorization: Bearer <your_token>" \
     -X GET \
     "http://<your-argo-server>:<port>/api/v1/workflows/<namespace>/<workflow_name>"

This will return a JSON response containing detailed workflow information, including its status and associated pods.

2. Parse the JSON Response:

The JSON response will contain a field (often nested) that lists the pods associated with the workflow. The exact path to this field may vary slightly depending on the Argo version; check the API documentation for your specific version. The structure might look something like this (simplified):

{
  "status": {
    "nodes": {
      "node-id-1": {
        "pod": {
          "name": "pod-name-1"
        }
      },
      "node-id-2": {
        "pod": {
          "name": "pod-name-2"
        }
      }
    }
  }
}

You'll need to parse this JSON response to extract the pod.name values from each node. Use a scripting language like Python or a command-line tool like jq to accomplish this efficiently.

3. Using jq to Extract Pod Names (Example):

jq is a powerful JSON processor. This command extracts all pod names:

curl -H "Authorization: Bearer <your_token>" \
     -X GET \
     "http://<your-argo-server>:<port>/api/v1/workflows/<namespace>/<workflow_name>" | \
     jq -r '.status.nodes[].pod.name'

This will output a list of pod names, one per line.

4. Error Handling:

Implement proper error handling to gracefully manage situations like invalid tokens, non-existent workflows, or API errors. Check the HTTP status code and handle potential exceptions accordingly.

5. Python Example (using requests):

import requests
import json

url = f"http://<your-argo-server>:<port>/api/v1/workflows/<namespace>/<workflow_name>"
headers = {"Authorization": f"Bearer <your_token>"}

response = requests.get(url, headers=headers)

if response.status_code == 200:
    data = response.json()
    pod_names = [node['pod']['name'] for node in data['status']['nodes'].values() if 'pod' in node]
    print(pod_names)
else:
    print(f"Error: {response.status_code} - {response.text}")

Remember to replace placeholders like <your_token>, <your-argo-server>, <port>, <namespace>, and <workflow_name> with your actual values. This approach allows you to programmatically retrieve Argo Workflow pod names for various automation and monitoring tasks. Always consult the official Argo Workflows API documentation for the most up-to-date information and endpoint details.

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