Evaggelos Balaskas - System Engineer

The sky above the port was the color of television, tuned to a dead channel

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Aug
28
2015
podcasts
Posted by ebal at 21:54:49 in blog, planet_ellak, planet_Sysadmin

This is a list with podcasts I listen on a regular base

  • Security Now Steve Gibson and Leo Laporte podcast about security news
  • Hacker Public Radio Various podcasts, mostly about free software
  • Talk Python To Me Podcast Podcast about python
  • The Changelog The Changelog is a member supported blog, weekly newsletter and podcast that covers the intersection of software development and open source.
  • ask-mrdns Matt Larson and Cricket Liu expound on DNS
  • Future Thinkers Podcast Various: Obsessed with all things future: singularity, technology, spirituality, and philosophy.
  • The Command Line Thomas Gideon’s podcast
  • cybersecurity-initiative American politics, prosperity, and purpose in the digital age through big ideas, technological innovation
Tag(s): podcast
    Tag: podcast
Aug
24
2015
The Keeper of Lost Causes - Jussi Adler-Olsen
Posted by ebal at 22:14:01 in books

Μου αρέσουν τα σκοτεινά βιβλία … δεν μπορώ να προσδιορίσω το γιατί. Ίσως μιλάνε υποσυνείδητα σε μέρη που δεν μπορώ ηθικά να φτάσω …

Ειδικά οι συγγραφείς των Σκανδιναβικών Χωρών έχουν γράψει αριστουργήματα κι ο Γιούσι Άντλερ-Όλσεν δεν αποτελεί εξαίρεση.

Στην αρχή του 2013 διάβασα το Βεβήλωση όπου ήταν το 2ο βιβλίο της σειράς Q. Το βιβλίο θυμάμαι το είχα ρουφήξει. Η σύγχυσή μου όταν διαπίστωσα πως είναι το 2ο στην σειρά κι ο Λιβάνης δεν είχε πουθενά το 1ο, απίστευτη. Μάλιστα θυμάμαι πως έχω κάνει φασαρία για το συγκεκριμένο θέμα σε περίπτερο του Λιβάνη σε έκθεση βιβλίων. Ο άνθρωπος στο περίπτερο μίλησε στο τηλέφωνο (καλοκαίρι 2013) μου είπε πως πράγματι δεν είναι διαθέσιμο γκρρρρρρ

Μιας κι η λίστα με τα todo list μου φτάνει στο φεγγάρι, το ξέχασα μέχρι πριν από μερικές μέρες. Όπου η αδελφή μου αγόρασε το 2ο βιβλίο (μετά από προτροπή μου). Μέσα σε 8 ώρες (σάββατο απόγευμα/κυριακή πρωί) ρούφηξα κι αυτό το βιβλίο!!!

Έχουν βγει και δύο ταινίες (βασισμένες στα δύο πρώτα βιβλία του συγγραφέα) -κι αυτές απίστευτες- κι ευτυχώς έχουν βγει και τα επόμενα δύο βιβλία της σειράς Q.

Προσπαθώ να διαβάζω τα βιβλία στα αγγλικά (εάν ο συγγραφέας το έχει γράψει στα αγγλικά) αλλά μιας και δεν μιλώ την γλώσσα του Γιούσι, προτειμώ την εκπληκτική μετάφραση του Χρήστου Καψάλη.

departmentq1.jpg

Tag(s): books
    Tag: books
Aug
23
2015
forwarding logs with Fluentd
Posted by ebal at 18:06:16 in blog, planet_ellak, planet_Sysadmin

Server_A —> Server_B —> Server_C

Let’s say that we have our elasticsearch/kibana setup on Server_C
but Server_A can’t talk to Server_C.

Server_A


# tail /etc/rsyslog.d/20_central_logging.conf 

*.*      @192.168.1.100:42185
& ~

Server_B

install fluentd



# wget -c http://packages.treasuredata.com.s3.amazonaws.com/2/redhat/6/x86_64/td-agent-2.2.1-0.el6.x86_64.rpm
# rpm -ivh td-agent-2.2.1-0.el6.x86_64.rpm

configure fluentd


# vim /etc/td-agent/td-agent.conf


<source>
  type syslog
  port 42185
  tag  rsyslog
</source>

<match ***>
  type forward
  send_timeout 10s
  recover_wait 10s
  heartbeat_interval 1s
  phi_threshold 16
  hard_timeout 60s

  <server>
    host 192.168.1.200
  </server>
</match>

Server C

install fluentd



# wget -c http://packages.treasuredata.com.s3.amazonaws.com/2/redhat/6/x86_64/td-agent-2.2.1-0.el6.x86_64.rpm
# rpm -ivh td-agent-2.2.1-0.el6.x86_64.rpm

configure fluentd


# vim /etc/td-agent/td-agent.conf

<match ***>
  type elasticsearch
  flush_interval 10s # for testing
  logstash_format true
</match>

PLZ Dont forget your iptables rules !!!!
UDP & TCP

Tag(s): Fluentd
    Tag: Fluentd
Aug
07
2015
PowerDNS Remote Backend
Posted by ebal at 11:09:52 in blog, planet_ellak, planet_Sysadmin

One of the great features that PowerDNS has, is the concepts of ‘backends’.

Backends give you the ability to choose the datastore you would like to save (or not) your dns data. If you are looking to migrate from another dns server (lets say bind ics) with bind zone files support, then you can choose the bind backend, copy the files and voila !

PowerDNS can also support multiple backends. So you can build/test your “new” infrastructure without compromise any existing data structure or as the consultants love to say: “With no-downtime!” Another approach is that you can add support for provisioning automate mechanism or whatever else you can think of !

A very good example of Pipe Backend is the PowerDNS Dynamic Reverse script that @kargig has modified to support reverse ipv6 responses (amazing, right ?).

I have a few (half–baked) ideas that I would like to implement with PowerDNS and I was looking on Remote Backend. It took me some time to understand the logic behind this (as I am not a developer, nor I will ever be!) and create a proof of concept script.

So this is my initial script, that I would like to share:
pdns remote - pipe

It doesnt do anything (yet), just sends everything to your syslog (/var/log/messages) for debugging.

The key to success is this quote:

You must always reply with JSON hash with at least one key, ‘result’

Tag(s): PowerDNS
    Tag: PowerDNS
Aug
04
2015
FSF Europe
Posted by ebal at 17:01:58 in blog, planet_ellak, planet_Sysadmin

This amazing Free Software Foundation - Europe has a “Spread the word” page that promotes freedom via stickers [0].

One of my all time favorite sticker is the

There is no cloud, just other people’s computers

thereisnocloud-v2-preview.png

but it is in pdf format.

I am avoiding flash and pdf in general and someone asked on twitter an SVG format.

Without any delay, the fsfe published the scribus source files!

You can find the .sla files here and a SVG format here: FSFE_No_Cloud_120×120-001.svg.

I strongly advice you, to help, promote and donate to this amazing foundation.

You can also translate the stickers to your native language and help spreading the freedom message to everybody.

[0] https://fsfe.org/contribute/spreadtheword.en.html

Tag(s): fsfe
    Tag: fsfe
Aug
03
2015
inside gaggia classic
Posted by ebal at 08:38:49 in blog

inside_gaggia_classic.jpg

Tag(s): gaggia, coffee, espresso
    Tag: gaggia, coffee, espresso
Aug
02
2015
disabling pocket on firefox
Posted by ebal at 19:10:43 in blog, planet_ellak, planet_Sysadmin

I am really disappointed about some of mozilla’s decisions.

One of them is the pocket integration.

Serves no purpose at all to embed a company’s add-on,
inside firefox without the choice of remove it!

So here is how to disable it :

open about:config and search for pocket

pocket_enabled.jpg

empty every string and change every boolean value to false:

pocket_disabled.jpg

Tag(s): firefox, pocket
    Tag: firefox, pocket
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