Scaleway Centos 7 GPG key yum update problem

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Got the following yum update error when launching Scaleway C2 server powered by Centos 7:

warning: /var/cache/yum/armhfp/7/base/packages/firewalld-0.3.9-14.el7.noarch.rpm: Header V3 RSA/SHA256 Signature, key ID f4a80eb5: NOKEY
Retrieving key from file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-SIG-AltArch-Arm32

The GPG keys listed for the “CentOS-7 – Base” repository are already installed but they are not correct for this package.
Check that the correct key URLs are configured for this repository.

Failing package is: firewalld-0.3.9-14.el7.noarch
GPG Keys are configured as: file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-SIG-AltArch-Arm32

Clearly shows GPG key is missing and yum stops there… This is how to fix it in less than 10 seconds:

rpm --import

and try to run yum Read the rest of this entry »

Scaleway cloud server SSH key login problem

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I have been playing around with Scaleway bare metal cloud servers and experienced problems with logging into my newly created server. My local PC is Ubuntu 16.04 and I added SSH key to Scaleway, but when connected with the following command

ssh -i root@

I got the following error:

sign_and_send_pubkey: signing failed: agent refused operation

and couldn’t login. Then, I found out that I have to execute the following command on my local workstation to successfully login into scaleway box:


Please note that if you add your scaleway SSH key in their control panel after you have created … Read the rest of this entry »

NO_PUBKEY A902DDA375E52366

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Ubuntu Intel video card repository at requires a custom public key imported before you can proceed. The usual error method you will be getting is like this:

W: GPG error: trusty InRelease: The following signatures couldn’t be verified because the public key is not available: NO_PUBKEY A902DDA375E52366

To fix this issue do the following:

sudo apt-key adv ––keyserver ––recv-keys A902DDA375E52366


Rember it’s dash-dash (––) in command line.

It should be fixed. For reference, I am including full log:

Executing: gpg –ignore-time-conflict –no-options –no-default-keyring –homedir /tmp/tmp.35JCw7DjiB –no-auto-check-trustdb –trust-model always –keyring /etc/apt/trusted.gpg –primary-keyring /etc/apt/trusted.gpg –keyserver –recv-keys A902DDA375E52366… Read the rest of this entry »

Netgear PR2000 Trek Travel Router

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Netgear just released a new firmware V1.0.0.12_1.0.1 for PR2000 Trek Travel Router.

This is a little nifty device that offers low cost router, access point, bridging and range extended features in one device. You can buy this device for less than $50 on-line and you will not find another device that offers the same feature set in the same price ballpark. It’s aimed for users that travel a lot and allows you to share one Internet connection for multiple devices – your smartphone, tablet or a laptop. Many hotels now charge you for multiple devices that you want to connect … Read the rest of this entry »

The best way to transfer you money around the world –

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Do you work abroad and you need your money transferred back to your home country? Do you still have some bills or loans that you need to pay in your native country? should be your first choice for international money transfers. I have been using this company for transferring my funds from my UK and USA accounts and the service has been marvelous. I have probably saved well over 150 EUR using Transferwise (please note that they offer very good exchange rates for USD->EUR, EUR->USD, GBP->EUR, EUR->GBP, GBP->USD, USD->GBP, probably ALWAYS beating your bank exchange rates) and the transfer … Read the rest of this entry »

Playing DVD movies on Ubuntu 14.04

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I installed ASUS DVD drive and had to figure out how to play encrypted DVDs that were scrambled with Content Scramble System (CSS).

First, I installed VLC player and tried to play video file(s) without success. The following error message was displayed:

libdvdnav: Using dvdnav version 4.2.1
libdvdread: Attempting to use device /dev/sr0 mounted on /media/XX/CATLOW for CSS authentication
libdvdnav: Can't read name block. Probably not a DVD-ROM device.
libdvdnav: Unable to find map file '/home/XX/.dvdnav/.map'
libdvdnav: DVD disk reports itself with Region mask 0x00f00000. Regions: 1 2 3 4
libdvdnav: Suspected RCE Region Protection!!!

Did some googling around and … Read the rest of this entry »

MySQL Cluster 7.3 GA released with foreign key support

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MySQL 7.3 Cluster has been finally released as a general availability (GA) release. From now on foreign keys are fully supported in MySQL Cluster as well as new NoSQL JavaScript with node.js, Foreign Keys, and Auto-Tuned Clustering features. You can download it freely from

Brief info from

MySQL Cluster is a write-scalable, real-time, ACID-compliant transactional database, designed to deliver 99.999% availability. With a distributed, multi-master architecture and no single point of failure, MySQL Cluster scales horizontally on commodity hardware with auto-sharding (partitioning) to serve read and write intensive workloads, accessed via SQL and NoSQL interfaces.

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Enable telnet utility or telnet server on Windows 2012 Standard or Datacenter Server

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To install Telnet client on a Windows Server 2012, first open the PowerShell.

To install a Telnet client run the following command:

install-windowsfeature “telnet-client”

To install a Telnet server run the following command:

install-windowsfeature “telnet-server”Read the rest of this entry »

Display count of all TCP connections on a Linux server or workstation

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Display all  TCP connections on a Linux based server (execute the command below from ROOT user):

netstat -an|awk ‘/tcp/ {print $6}’|sort|uniq -c

Should output something like:

      7 LISTEN
      2 TIME_WAIT

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Percona 1C4CBDCDCD2EFD2A key importing

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Getting error with downloading and installing Percona Public GPG key on Debian or Ubuntu?

W: GPG error: squeeze Release: The following signatures couldn’t be verified because the public key is not available: NO_PUBKEY 1C4CBDCDCD2EFD2A
Run the following command:

gpg –keyserver –recv-keys 1C4CBDCDCD2EFD2A

it will output:

gpg: directory `/root/.gnupg’ created
gpg: new configuration file `/root/.gnupg/gpg.conf’ created
gpg: WARNING: options in `/root/.gnupg/gpg.conf’ are not yet active during this run
gpg: keyring `/root/.gnupg/secring.gpg’ created
gpg: keyring `/root/.gnupg/pubring.gpg’ created
gpg: requesting key CD2EFD2A from hkp server
gpg: /root/.gnupg/trustdb.gpg: trustdb created
gpg: key CD2EFD2A: public key “Percona MySQL Development Team <>” imported

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