alukach

A quick dump of criteria for deciding whether your project needs a NAT and, if so, what type it should be.

graph TD
    A(Do you need a NAT?) --> B
    B{Do you have services in a Private Subnet that\nneed to access resources outside of the network?}
    
    B -->|No| NotNeeded[You don't need a NAT]
    B -->|Yes| C
    C{Can you move those resources in a Public Subnet?} -->|Yes| PublicSubnet[Move to a Public Subnet instead] --> NotNeeded

ranchodeluxe

Inter-application communication/networking options in ECS versus K8s with an emphasis on avoiding setting up load balancers:


+--------------+----------------------------------------------+-----------------+-----------------+-------------+
|    FEATURE   |                  DESCRIPTION                 |     AWS ECS     |    KUBERNETES   |  CONCLUSION |
+--------------+----------------------------------------------+-----------------+-----------------+-------------+
|              | Multiple containers per TaskDef/Pod.         |                 |                 |             |
|              | Supports inter-container communication       |     supports    |     supports    |             |
|   **Sidecar  | via loopback on `localhost:<port>`. This     | inter-container | inter-container |             |
| Networking** | also means port collisions have to be        |      comms      |      comms      |             |

joepie91

No, your cryptocurrency cannot work

Whenever the topic of Bitcoin's energy usage comes up, there's always a flood of hastily-constructed comments by people claiming that their favourite cryptocurrency isn't like Bitcoin, that their favourite cryptocurrency is energy-efficient and scalable and whatnot.

They're wrong, and are quite possibly trying to scam you. Let's look at why.

What is a cryptocurrency anyway?

There are plenty of intricate and complex articles trying to convince you that cryptocurrencies are the future. They usually heavily use jargon and vague terms, make vague promises, and generally give you a sense that there must be something there, but you always come away from them more confused than you were before.

alukach

# .github/workflows/app.yaml
name: My Python Project
on: push

jobs:
  test:
    runs-on: ubuntu-latest
    timeout-minutes: 10

    services:

alukach

#! /usr/bin/env python3
"""
A utility to stream records from one or many S3 Inventory reports, with a progress bar.

./parse-inventory-progress s3://my-bucket/path/to/my/inventory/2019-12-15T00-00Z/manifest.json > out.csv
"""
import json
import csv
import gzip
import sys

nirizr

def upsert(session, model, rows):
    table = model.__table__
    stmt = postgresql.insert(table)
    primary_keys = [key.name for key in inspect(table).primary_key]
    update_dict = {c.name: c for c in stmt.excluded if not c.primary_key}

    if not update_dict:
        raise ValueError("insert_or_update resulted in an empty update_dict")

    stmt = stmt.on_conflict_do_update(index_elements=primary_keys,

vktr

function (user, context, callback) {
  user.app_metadata = user.app_metadata || {};

  if ('stripe_customer_id' in user.app_metadata) {
    context.idToken['https://example.com/stripe_customer_id'] = user.app_metadata.stripe_customer_id;
    return callback(null, user, context);
  }

  var stripe = require('stripe')('sk_....');
  var customer = {

alukach

Docker Cheatsheet

Glossary

Container

Single unit of computing.

Task

dzNavitski

There is no requirement that you make a one-to-one in/out ratio. So you can emit multiple actions using flatMap if you need to:

const loaded = (results) => ({type: 'RESULTS_LOADED', results});
const otherAction = (results) => ({type: 'MY_OTHER_ACTION', results});

searchEpic = (action$) => 
    action$
    .ofType('SEARCH')
    .mergeMap(
        Observable

olivierlacan

This guide assumes that you recently run brew upgrade postgresql and discovered to your dismay that you accidentally bumped from one major version to another: say 9.3.x to 9.4.x. Yes, that is a major version bump in PG land.

First let's check something.

brew info postgresql

The top of what gets printed as a result is the most important: