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Category: Operating systems

Disable automatic Flatpak updates

By Vratislav Hutsky Posted on 27. 1. 2020 Posted in General thoughts, Operating systems

I have to say I feel slightly ambiguous about Flatpak. On one hand, I’m really glad it allows me to run applications like Spotify, Zoom or Skype on my computers in a convenient way. Applications that are not open sourced, …

Disable automatic Flatpak updates Read more »

Tagged with: gnome, linux, RHEL

Upgrade Postgresql from 9.3 to 11

By Vratislav Hutsky Posted on 12. 2. 2019 Posted in Operating systems

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 …

Upgrade Postgresql from 9.3 to 11 Read more »

Tagged with: centos, linux, postgresql

RHEL 8 Beta

By Vratislav Hutsky Posted on 29. 12. 2018 Posted in Operating systems

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 …

RHEL 8 Beta Read more »

Tagged with: desktop, kvm, linux, OS, RHEL

Migration from OpenLDAP 2.3 to 2.4

By Vratislav Hutsky Posted on 25. 8. 2018 Posted in Operating systems

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 …

Migration from OpenLDAP 2.3 to 2.4 Read more »

Tagged with: centos, ldap, linux

Debian buster and wake on lan

By Vratislav Hutsky Posted on 3. 3. 2018 Posted in Hardware, Operating systems

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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Tagged with: debian, linux, networking

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

By Vratislav Hutsky Posted on 7. 1. 2018 Posted in Hardware, Operating systems

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. …

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

Tagged with: centos, hardware, linux

IPv6 with gateway in a different subnet

By Vratislav Hutsky Posted on 15. 9. 2017 Posted in Operating systems

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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Tagged with: centos, networking

header_checks and Spamassassin headers in Postfix 2.6

By Vratislav Hutsky Posted on 3. 7. 2016 Posted in Operating systems

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 …

header_checks and Spamassassin headers in Postfix 2.6 Read more »

Tagged with: centos, linux, networking

Apache and umask 002

By Vratislav Hutsky Posted on 9. 6. 2016 Posted in Operating systems, Web-related

I ran into a problem with Apache on Centos 6. For some time, I was the only person who had access to this particular machine so permissions were not a problem. However, now that somebody else is taking care of the website …

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Tagged with: apache, centos, linux, nginx, web

“Lazy” Synolocker

By Vratislav Hutsky Posted on 26. 3. 2016 Posted in Hardware, Operating systems

A funny thing happened to me the other day. Someone brought me a 4-bay Synology NAS which had been hit by ransomware called Synolocker. The usual scenario – the NAS was exposed to the internet, maybe not updated as regularly …

“Lazy” Synolocker Read more »

Tagged with: hardware, NAS

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About me

linkedinMy name is Vratislav Hutsky. I work as Associate Manager at Red Hat. Before that, I was a freelance server admin and developer for quite a few years.

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