Author: Vratislav Hutsky

Upgrade Postgresql from 9.3 to 11

I had to update an already unsupported Postgresql instance running on version 9.3 to the latest version 11. Luckily, this process is quite straightforward and all the hard lifting is done by the postgresql update tool. The only problem there

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RHEL 8 Beta

Beta version of Red Hat Enterprise Linux 8.0 was announced recently. It can be downloaded without any registration, or you can go through the Developers Program and get a subscription for development usage for free. I downloaded the ISO this

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Migration from OpenLDAP 2.3 to 2.4

Note: I wrote this post during Christmas break 2017, but it took me some time before I managed to give it a better form, verify the steps again and publish it. Hence some Xmas references in a text published during

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Debian buster and wake on lan

For quite some time, I used to have a low-end motherboard that didn’t support Wake on LAN. So when I left for work or holiday, I would usually leave my home PC on, because sometimes I just needed to access

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Weekend hobby – PC cleaning

This is a PC that belongs to my brother in law. He hasn’t been using it for over a year, ever since he switched to Mac, so he’d like to get rid of it. It has i5 (Sandy bridge) inside

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KVM: Cannot find any matching source devices for logical volume group vg2

I installed Centos 7 on a brand new machine about a half a year ago, and set up KVM with two data pools – one just a regular directory for old raw images, the second being an LVM volume group.

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IPv6 with gateway in a different subnet

I’ve run across this peculiar problem. I was trying to set up IPv6 on a Centos 6 machine. I thought that it would be a simple task – a couple of minutes at most – as I had done that

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Raspberry Pi – analog output noise

I got Raspberry Pi 2 as a present from my brother. It’s a nice toy, I was trying out OpenELEC, it makes for a really nice home theater in combination with a NAS on local network. The only drawback was

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Scroll emulation with Trackman Marble in Debian 9

Spending a lot of time with mouse and keyboard, I decided I would give it a try with trackball. A friend lent me Logitech Trackman Marble for a week to see if I can get used to it. The one

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header_checks and Spamassassin headers in Postfix 2.6

I’ve had this mail server of mine for some time. I was an early adopter of Gmail back then, but as years went on and it became obvious that messages were data-mined by Gmail, I eventually started running my own

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