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Category: Operating systems

IPv6 with gateway in a different subnet

By Vratislav Hutsky Posted on 15. 9. 2017 Posted in Operating systems Tagged with centos, networking

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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header_checks and Spamassassin headers in Postfix 2.6

By Vratislav Hutsky Posted on 3. 7. 2016 Posted in Operating systems Tagged with centos, linux, networking

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 »

Apache and umask 002

By Vratislav Hutsky Posted on 9. 6. 2016 Posted in Operating systems, Web-related Tagged with apache, centos, linux, nginx, web

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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“Lazy” Synolocker

By Vratislav Hutsky Posted on 26. 3. 2016 Posted in Hardware, Operating systems Tagged with hardware, NAS

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 »

Centos 7 – bridge for KVM

By Vratislav Hutsky Posted on 25. 2. 2016 Posted in Operating systems Tagged with centos, linux, networking, OS

I got a machine on which I wanted to try Centos 7 and KVM virtualization. As usual, I had to search for how to do a network bridge as it’s been quite long since I did it last time (on …

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Systemd problem

By Vratislav Hutsky Posted on 11. 2. 2016 Posted in General thoughts, Operating systems Tagged with debian, OS

At home, I’ve been using rolling release of Debian for my desktop for quite some time. The good thing about it is that years go by and you need not worry about the end of life of this or that …

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Skype in Docker

By Vratislav Hutsky Posted on 15. 6. 2015 Posted in General thoughts, Operating systems Tagged with debian, OS

Although jabber is my preferred IM protocol, sometimes I have to communicate with people who, for some reason, only use Skype. On Debian, that can be quite a problem, supposing you are not particularly keen on weed infestation of your …

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AWK – print no newline

By Vratislav Hutsky Posted on 16. 12. 2014 Posted in Operating systems Tagged with awk, linux, shell

Using awk to display information, the print function, by default, adds newline after each iteration. I wanted to copy the results and use them as an actual array in a program and preferred to have them all on one line, …

AWK – print no newline Read more »

CentOS 6 and MiniDLNA

By Vratislav Hutsky Posted on 8. 11. 2014 Posted in Operating systems Tagged with centos, OS

I’ve got a small home server made from a half-broken laptop nobody wanted any more. The screen was’t working, but otherwise the machine was fine, so I took it, shipped Centos 6 on it and it’s been serving as a …

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Mount a disk image containing LVM

By Vratislav Hutsky Posted on 3. 6. 2014 Posted in Operating systems Tagged with linux, OS

If you have an image with standard partitions, you can mount any partition as a loopback device using the offset given by fdisk: user@machine:/home/user# fdisk -l disk.img Disk disk.img: 750.2 GB, 750156374016 bytes 255 heads, 63 sectors/track, 91201 cylinders, total …

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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.

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