Switch configuration lines using comments

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The meaning of “phlpwcspweb3” or why you should not do abbreviations in the code

“phlpwcspweb3”  is found at the “Amazon Web Services – Tagging Best Practices

From what I can decode from “phlpwcspweb3”  this is something related to web, and probably there are at least 3 instances of that kind.

According to AWS this should be meaningful hostname.

If you have decoded this you probably do not need to read further….

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Running chef test-kitchen with newer vagrant

If you get

VBoxManage: error: The specified string / bytes buffer was to small. Specify a larger one and retry. (VERR_CFGM_NOT_ENOUGH_SPACE)

This means that the virtual machine needs a shorter name for the VM.

  name: vagrant
    name: pdcsmb
    memory: 4144
    cpus: 4
    # - ["forwarded_port", {guest: 3000, host: 3000}]
    # - ["private_network", {ip: ""}]

Bonus tip:

If you get

No live threads left. Deadlock?

Then remove all gems and reinstall chefdk.

Running chef kitchen with cookbook dependencies


source ''


group :test do
  cookbook 'company_firewall', path: "../company_firewall"
  cookbook 'company_nginx', path: "../company_nginx"
  cookbook 'company', path: "../company"
  cookbook 'data-incoming', path: "../data-incoming"
  cookbook 'aws', path: "../aws"


name             'data-listener'
maintainer       'Company'
maintainer_email '[email protected]'
license          'All rights reserved'
description      'Installs/Configures data-listener'
long_description, ''))
version          '0.2.32'

depends 'sysctl', '~> 1.0.5'
depends 'copany_firewall'
depends 'company_nginx'
depends 'aws'


mdadm: Duplicate MD device names in conf file where found.

remove the doublicate file from /etc/mdadm/mdadm.conf

cp mdadm.conf mdadm.conf.backup
grep -v "2 UUIDsomehing..." mdadm.conf.backup > mdadm.conf

Make sure the raid is up

mdadm --assemble --scan

Load the lvm volumes

lvm vgchange -ay
  • -a – activate
  • -y – complete

exit to try the changes

$(initramfs) exit

Now you system will boot

Making the changes permanent

Fix the /etc/mdadm/mdadm.conf file by removing the duplicate definition.

update-initramfs  -u -k all

If you are still in initramfs busybox

mkdir /target
mount /dev/md1 /target
mount -o bind /dev /target/dev
mount -o bind /proc /target/proc
mount -o bind /sys /target/sys
mount -o bind /dev/pts /target/dev/pts
chroot /target /bin/bash


mdadm –detail /dev/md0 mdadm –detail /dev/md1

mdadm –detail –scan > /etc/mdadm/mdadm.conf

Stop an array & assemble array mdadm –stop /dev/md1

mdadm –assemble /dev/md0 /dev/sda1 /dev/sdb1 /dev/sdc1 /dev/sdd1 mdadm –assemble /dev/md1 /dev/sda2 /dev/sdb2 /dev/sdc2 /dev/sdd2


38693387_2127079967530580_4018998239729549312_n (1)

Building docker image with host network aka –net=host

There is no option to provide the net as param while building the docker images.
So the container doesn’t have internet from inside.
and is common to get this kind of errors

Running in NNNNNNNNN
Err wheezy Release.gpg
  Could not resolve ''

One (stupid) solution is to put in the Docker file

RUN echo "nameserver" > /etc/resolv.conf; cat /etc/resolv.conf

Another is to help Docker with the networking.

Here is a solution is pointed here

# Forward chain between docker0 and eth0
iptables -A FORWARD -i docker0 -o eth0 -j ACCEPT
iptables -A FORWARD -i eth0 -o docker0 -j ACCEPT
# IPv6 chain if needed
ip6tables -A FORWARD -i docker0 -o eth0 -j ACCEPT
ip6tables -A FORWARD -i eth0 -o docker0 -j ACCEPT

And also to configure docker to use a dns server as pointed here

Docker official doc gives instruments to Configure a DNS server for use by Docker

Open the /etc/default/docker file for editing.

$ sudo nano /etc/default/docker

Add a setting for Docker.


Replace with a local DNS server such as You can also specify multiple DNS servers. Separated them with spaces, for example:

–dns –dns

Warning: If you’re doing this on a laptop which connects to various networks, make sure to choose a public DNS server.

ps: nm-tool can be used to check local host DNS server

Save and close the file.

Restart the Docker daemon.

$ sudo restart docker

Replacement for tilda guake or other not working solutions

This script will activate gnome-terminal when you press INSERT (the key right to backspace) and will hide it when pressed again.

Using this script is better than tilda or guake or whatever because you can resize the terminal. You can clean the terminal and have all goods you have in normal terminal.

To install it under lubuntu/lxde open ~/config/openbox/lubuntu-rc.xml and add

Here is the code for the


#TERMINAL_ID=`$XDO  search --name Terminal | /usr/bin/tail -1`

raise_or_fall () {
  TERMINAL_ID=$($XDO search --class gnome-terminal | /usr/bin/tail -1)
  CURRENT_WINDOW_ID=`$XDO getwindowfocus`

  WIDS=`$XDO search --onlyvisible --class gnome-terminal`

  if [ "$CURRENT_WINDOW_ID" -eq "$WIDS" ]
    # zenity --question --text="down"
    $XDO windowminimize $TERMINAL_ID
    # zenity --question --text="up"
    # $XDO windowraise $TERMINAL_ID
    # $XDO windowfocus --sync $TERMINAL_ID
     $XDO windowactivate $TERMINAL_ID

if `ps aux | grep "[g]nome-terminal" > /dev/null`
  gnome-terminal &

uptimed and uprecords

Nice! As I am maniac of  uptime here is nice utility found at

uptimed. It is similar to the utility that most of us have heard of, uptime, except that it runs as a daemon and logs the system’s uptime instead of just reading info that is lost on a reboot. Uptimed provides a secondary command called uprecords

Autoicrement the serial in bind zone files

Argh. 30+ zone files and I have to increment all numbers by hand…no way.

Usage:  ./inc.rb in the current directory with all db files.


Dir.glob("*.db") do |file_name|
 new_zone = [] Continue reading

How to access a server via sftp with ssh tunnel

Here is what we want to do

We have the following case:

Developer workstation windows with putty – a host which has access to the server – firewalled host – we want to put files here via sftp

What we want to do is to use host as a proxy and connect to the machine.

Tools that are used –

Here are the screenshots with the steps ….

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