kwilczynski

iptables -t filter -I OUTPUT -d 169.254.169.254 -j EC2
iptables -N EC2
iptables -A EC2 -m owner --uid-owner root -d 169.254.169.254 -j ACCEPT
iptables -A EC2 -j REJECT --reject-with icmp-host-unreachable

konpatp

import functools


def force_async(fn):
    '''
    turns a sync function to async function using threads
    '''
    from concurrent.futures import ThreadPoolExecutor
    import asyncio
    pool = ThreadPoolExecutor()

olih

Processing JSON using jq

jq is useful to slice, filter, map and transform structured json data.

Installing jq

On Mac OS

brew install jq

vasanthk

System Design Cheatsheet

Picking the right architecture = Picking the right battles + Managing trade-offs

Basic Steps

1. Clarify and agree on the scope of the system

• User cases (description of sequences of events that, taken together, lead to a system doing something useful)
  • Who is going to use it?
  • How are they going to use it?

arilivigni

- defaults:
    name: ci-workflow-provision
    description: |
        Managed by Jenkins Job Builder. Do not edit via web.
    concurrent: true
    scm:
        - git:
            url: 'https://code.engineering.redhat.com/gerrit/ci-ops-central'
            branches:
                - origin/master

magnetikonline

AWS S3 bucket and IAM policy recipes

• Recipes
  • Anonymous GET access
  • Anonymous GET access - match HTTP referrer
  • Full access for specific IAM user/role
  • GET/PUT/DELETE access to specific path within a bucket
  • Restricted LIST & PUT/DELETE access to specific path within a bucket
  • Full access (and S3 console) for specific IAM users
  • Bucket and object delete deny

wrunk

#!/usr/bin/env/python
# 
# More of a reference of using jinaj2 without actual template files.
# This is great for a simple output transformation to standard out.
#
# Of course you will need to "sudo pip install jinja2" first!
#
# I like to refer to the following to remember how to use jinja2 :)
# http://jinja.pocoo.org/docs/templates/
#