SIMPLE EC2 INSTANCE + ROUTE53 DNS
If you have a multi-environment AWS setup, and want a easy way to resolve all EC2 instance using Route53 DNS, look no further!
Currently I’m maintaining a production and staging environment on Amazon Web Services across multiple regions. We tend to not use ElasticIPs as that just increases cost, plus internally we resolve using Consul . There is one drawback with not using ElasticIPs, when ever the instance restarts they will be offered a new dynamic IP (we will solve this with automation).
C# APPLICATIONS DEPLOYED WITH DOCKER AND MONO
Lately I’ve been working a lot with Mono , and building C# applications on Linux. Just recently I discovered the official mono image in the Docker Hub Repo . This image comes with xbuild and NuGet (tools we need for building).
So lets do a little work and get a mono application up and running (note I’m using a company application and will remove any references that may be sensitive.) I start by pulling the application’s source code down beside the Dockerfile :
ELASTICSEARCH USING DOCKER
Elasticsearch is a distributed RESTFul search tool over the HTTP protocol. And we are going to use Docker to spin up multiple nodes in the cluster. First we need a server node running Docker. I’m using a Debian server so the command I need is apt-get:
# apt-get install docker.io
After installing the package make sure the docker command is available:
# docker version
Client version: 1.3.1
Client API version: 1.15
Go version (client): go1.3.2
Git commit (client): 4e9bbfa
OS/Arch (client): linux/amd64
Server version: 1.3.1
Server API version: 1.15
Go version (server): go1.3.2
Git commit (server): 4e9bbfa
Excellent we now have docker, lets start by downloading a image , the below command will download the latest Debian docker image:
PURCHASED MY FIRST BRAND NEW DISC THE OTHER DAY.
Needed a good Mid Range disc to go along wit my Innova Boss (driver) and Innova Aviar (Putter), a veteran disc golfer in the shop suggested the Discraft Buzz ,Innova Roc3, and this Innova Spider.
HEARTHSTONE ARENA
I’ve been playing a little bit of
Hearthstone
lately, and heard the
Mage
is one of the best
for arena.
I won’t say I did great, but then again it wasn’t terrible.
SAGA VOLUME THREE!
Picked up Volume 3 of Saga last night, this has been a fantastic graphic novel and I would recommend it!
TV STYLE COMPUTER HACKING!
My son asked the other night if hacking computers really worked like on television,
and if numbers/words really flashed across the screen.
I explained to him a bit, then told him we could make something that looked like he
seen on television. Below is a print out I wrote for him.
Keep in mind I tried to dumb it down a bit for my 10 year old son.
Hacking MD5 Hashes
What is a MD5 Hash?
MD5 is a widely used message-digest algorithm used for creating
SPLIT PYTHON LIST BY NTH ITEM
This has been one of the processes I’ve normally not solved in a clean or readable way.
In []: a = [1,2,3,4,5,6,7,8]
Taking the top output I want to return something similar to below.
Out[]: [(1, 2), (3, 4), (5, 6), (7, 8)]
Using a Pythonic approach this task isn’t to difficult, but there is some explaining to do.
First lets look at the code:
In []: a = iter([1,2,3,4,5,6,7,8])
In []: [ i for i in zip(a, a) ]
Out[]: [(1, 2), (3, 4), (5, 6), (7, 8)]
First we need to pass our list to the iter function, this turns our list into a iterator object:
LINUX /PROC/NET/ROUTE ADDRESSES UNREADABLE
So you may have looked at /proc/net/route before and thought how the heck am I suppose to read this. Well here is the low down.
This file uses endianness to store the addresses as hexadecimal, in reverse; for example 192 as hex is C0 :
In []: hex(192)
Out[]: '0xc0'
So lets take a look at our route file:
Iface Destination Gateway Flags RefCnt Use Metric Mask MTU Window IRTT
eth0 00087F0A 00000000 0001 0 0 0 00FFFFFF 0 0 0
eth0 0000FEA9 00000000 0001 0 0 1002 0000FFFF 0 0 0
eth0 00000000 01087F0A 0003 0 0 0 00000000 0 0 0
Now the first entry has a destination of 00087F0A , lets go ahead and chunk these in to hex characters: