jpetazzo

So I heard you hosed your Riak cluster

I don't know what you did (I don't know what I did when this happened to me), but you ended up with a completely borked Riak cluster. Possible causes and symptoms include:

• riak-admin transfers shows different things depending on the node you run it on
• you tried to leave/join nodes to fix things, but it made them only worse
• you ran mixed versions in parallel, instead of doing a clean rolling upgrade
• some data seems to be missing, and when you list the keys in a bucket, clearly there is not the amount you were expecting
• YOU'RE AFRAID YOU MIGHT HAVE LOST DATA

jpetazzo

#!/usr/bin/env python

# delete a given riak bucket

import sys
import requests
import json
from pprint import pprint

if len(sys.argv) < 3:

jpetazzo

# List all merges to default branch
# (Technically, each time there was a merge into default, show the last
# changeset of the merged branch)

hg log --rev 'parents(merge() and branch(default)) and not branch(default)'

jpetazzo

#!/usr/bin/env python

import random

jobs = [ 10, 10, 10, 10, 10, 5, 5, 5, 5, 5 ]
tmax = 200
slots = tmax*[0]

def next_time_fixed(now, job):
    return now+job

jpetazzo

www:
  type: python

jpetazzo

#!/usr/bin/env python

"""
We're looking for stuff like this:
dump_header+0x92/0x200
"""

import re
import sys
data = sys.stdin.read()

jpetazzo

Oct 09, 2012
09:23 AM PDT
Hi,

What's the unit used in CloudWatch to report instance Network In and Out traffic?

We're comparing the values with those reported by our in-house metrics system, 
and while the general shape of the graph is similar, the values don't match.

CloudWatch reports values in "Network In (Bytes)". Is it bytes per minute?

jpetazzo

# You can adapt this; notably, I suggest that you:
# - change the port to your liking
# - maybe add a destination IP address to break more selectively
# - change the "4:" value (it says after how many packets the connection should break)

iptables -A OUTPUT -j REJECT --reject-with tcp-reset \
    -p tcp --dport 443 \
    -m connbytes --connbytes-dir both --connbytes-mode packets --connbytes 4: 

jpetazzo

#!/bin/sh
MYSQL="mysql --skip-column-names --batch"
for DB in $($MYSQL -e "show databases" \
            | grep -v ^information_schema$ \
            | grep -v ^mysql$
            )
do
    for TABLE in $($MYSQL --database $DB -e "show tables")
    do
        echo -n "$DB.$TABLE | $(du -sm /var/lib/mysql) | "

jpetazzo

Autobahn on dotCloud!

This code is 99% Autobah example code, 1% dotCloud adaptation.

To test this on dotCloud:

- create a dotCloud account at http://www.dotcloud.com/
  (free, no credit card)

- install dotCloud CLI, see http://docs.dotcloud.com/