bart.jakubowski.in

L2L IPSec with mikrotik

Quick and simple lan-to-lan IPSec setup between two mikrotik routers

Find and delete slack messages

There will be future post about creating simple slack bots in python and this quick post is kind of related ;) Case is quite simple, we have a bot and it produced lot of crap on several channels. Here is a simple python snippet to

jenkins

A real example of Jenkins active choices and reactive parameter

I've struggled with this for a while but finally made it! Main goal was to read a list of docker images tags from a private docker registry, each time a

nvidia

Nvidia and AMD together on Linux

For a longer while I'm having multiple GPU's on a Linux desktop. Reason behind it is quite simple - I'm using it for crypto mining! And I must say it

jenkins

Jenkins security and script approvals

I've gathered some information related to security that I faced creating automated Jenkins setup. Script ApprovalThis simple Jenkins security system is designed to allow any kind of script to be

groovy

Remote git branches with groovy

Hadfull code snippet I'm using for getting git branches from remote repos inside Jenkins pipeline. It uses already defined Jenkins credential to access the repo. import groovy.json.JsonSlurper import hudson.FilePath import jenkins.model.Jenkins import hudson.model.* def credentials = com.cloudbees.plugins.

pulseaudio

How to hear my voice in speakers with a mic under linux?

My little son got a real proffesional microphone on his birthday as he likes to sing but we realized that we have a big problem. There is no device to plug it into. Only thing capable to play some sound was a panasonic soundbar but it does not have any ports avaliable besides HDMI (ARC).

puppet

Issues adding new collaborators to eyaml encrypted files

In some puppet workflows, EYAML GPG Encryption is used to encrypt/decrypt secrets in yaml files (hiera data). There where two solutions to manage it hiera-gpg (already deprecated )hiera-eyaml - backend for Hiera that provides per-value asymmetric encryption of sensitive dataUsing hiera-eyaml day to

mikrotik

Running routerOS on Xen as a VM

I'm working with mikrotik for more then two years now and I must say that its very convenient piece both software and hardware. My needs for the router capabilities getting

mining

Monero mining with Nvidia on LMDE2

It was quite a hassle to find something that will compile and work under LMDE2 as its still based on Debian 8.10 with an old version of cmake and

mikrotik

Ipv6 address propagation on Mikrotik

Time to another part of the ipv6 story. We already have ipv6 subnet sharing linux-6to4-mikrotik configured so lets propagate some prefixes across the internal network. Like in the previous blog

ipv6

ipv6 subnet sharing linux-6to4-mikrotik

Some ISP gives native ipv6 by default but unfortunately my ISP is not offering v6 protocol. Let's try to delegate a small subnet from my dedicated linux server to my home Mikrotik router.

postfix

drop TLS on relay with postfix

In some cases people do SSL termination on Load Balancers for HTTPS connection to save CPU. I was wondering if that also possible for SMTP but I've quite quicky find out that its not that easy. General concept +----------------+ +----------------------> POSTFIX | | | relay | | | +-------------&

android

Remove built-in analytics from OxygenOS

For couple of years I'm a big fan of OnePlus. Watching their moves from the first device I bought. I was a happy user of OnePlus One (that is not

resume

Automate your resume Like A Boss

While ago I was thinking that it would be nice to have my CV always fresh and updated. Fixing it every time you change a job or just apply somewhere

gpg

GPG handy commands

Some time ago I've decided to share a post about making yourself a perfect GPG keypair that covered the basics around creating a perfect GPG key. Here is a little

puppet

hiera EYAML and GPG problems

I'm commonly using hiera-eyaml-gpg inside hiera in puppet and came across quite interesting problem. ASSUMPTIONS Lets assume we have everyting ready to do the encryption around secrets in YAML: hiera-eyaml-gpg installed either gpgme or ruby_gpg gems installed ruby-dev package installed gpg agent working

debian

Multiple IPv6 tunnels on single machine

Recently my friend asked me to help him to set up multiple ipv6 tunnels on a single linux box. After some reading and initial config decided to drop it as

gpg

Make yourself a perfect GPG keypair

Create yourself a perfect gpg keypair! Step by step guide to make your gpg working.

ssh

Perfect ssh config

Recently I've installed latest openssh (7.5p1) to mess around with the config. As i'm having lots of hosts decided to use Include to make things more clear. Here is a basic file structure: ~/.ssh/ ├── config └── config.d ├── crp │ ├── prod │ ├── puppet │ ├── qa │ └── test └── priv

ssh

openssh 7.5p1 ubuntu packages (dirty)

dirty build of ubuntu openssh packages

aws

Elastic Beanstalk and Invalid Dockerrun.aws.json version

I was trying to deploy a multi-container environment on Elastic beanstalk (infrastructure bit was created long time ago using terraform) and during the deployment I've did get a following error:

linux

page allocation failure

Recently found a problem with my rasbian running on rpi3. I'm using it quite heavily running couple services that are consuming(some of them caching) almost all memory. Here is some dmesg snipet: swapper/0: page allocation failure: order:0, mode:0x2080020(GFP_ATOMIC)

gpg

GnuPG basics

GnuPG (also known as GPG) is a complete and free implementation of the OpenPGP (RFC4880) standard and allows you to secure your data and communication flows. Its having a command

linux

Supermicro IPMIView on linux

Graphical IPMI tools make life easier as you don't have to remember commands or syntax and as most GUI tools are provided by the IPMI device vendors, they may offer vendor specific functionality that isn't available in the generic command line tools. Of course,

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