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Production deployment patterns

Graceful shutdown, prod config, rollouts, readiness probes, and ship-with-confidence checks.

4 matches

How to Mock a Container Registry in Python

Build an in-memory container registry mock with push, tag listing, and manifest retrieval logic for testing deployment tooling.

containers testing mocking

Python

import json
from collections import defaultdict


class MockRegistry:
    def __init__(self):
        self.repositories = defaultdict(dict)

    def push_image(self, repo: str, tag: str, layers: list[str]) -> None:
        self.repositories[repo][tag] = {
            "layers": layers,
            "size": sum(len(layer…

14 0 Open

Production deployment patterns easy

How to Mock time.sleep in a Python PreStop Hook

This code simulates a Kubernetes PreStop hook that delays shutdown, then mocks time.sleep to verify the hook logic without real delay.

mocking prestop kubernetes

Python

import subprocess
import sys
import time
from unittest.mock import patch

def pre_stop_hook():
    """Simulate a Kubernetes PreStop hook that sleeps before shutdown."""
    print("PreStop hook started: delaying shutdown")
    time.sleep(3)
    print("PreStop hook completed: ready to shutdown")

if __name__ == "__main_…

14 0 Open

Production deployment patterns medium

How to Smoke Test a Deployment in Python with unittest.mock

Run a post-deploy smoke test by mocking the deployment status check to verify your health-check logic returns PASS/FAIL.

deployment smoke-test unittest-mock

Python

import unittest
from unittest.mock import Mock, patch

class DeploymentService:
    def check_status(self):
        return "unknown"

def smoke_test_deploy():
    service = DeploymentService()
    with patch.object(service, "check_status", return_value="healthy") as mock_check:
        status = service.check_status()
…

13 0 Open

Production deployment patterns medium

Mock ConfigMap Mount Environment Variables in Python

Simulate reading environment variables from a Kubernetes ConfigMap-mounted directory and test it with mocks.

kubernetes configmap mocking

Python

import os
import tempfile
from unittest.mock import patch

def load_config_from_mount(mount_path):
    """Simulate reading environment variables from a ConfigMap-mounted directory."""
    config = {}
    for filename in os.listdir(mount_path):
        file_path = os.path.join(mount_path, filename)
        if os.path.i…

14 0 Open

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