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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Tag: linux
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.…
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…
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…
Apache and umask 002
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…
Centos 7 – bridge for KVM
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…
AWK – print no newline
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,…
Grep result to a shell variable – no line breaks
There was this website containing regularly updated content I wanted to follow. Unfortunately, they had no RSS feed available and I didn’t feel like checking on the website every now and then. Also, what I needed was just the posts…
Mount a disk image containing LVM
If you have an image with standard partitions, you can mount any partition as a loopback device using the offset given by fdisk:
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user@machine:/home/user# fdisk -l disk.img Disk disk.img: 750.2 GB, 750156374016 bytes 255 heads, 63 sectors/track, 91201 cylinders, total 1465149168 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00073e63 Device Boot Start End Blocks Id System /dev/sda1 * 2048 204802047 102400000 7 HPFS/NTFS/exFAT /dev/sda2 204804094 1465147391 630171649 5 Extended /dev/sda5 204804096 1457340415 626268160 83 Linux /dev/sda6 1457342464 1465147391 3902464 82 Linux swap / Solaris |
The sda5 partition starts on sector 204804096. We know from fdisk -l that one sector is…
Broken MATE panel
Following an upgrade in Debian Jessie/testing, I was left with no panels at all after logging into the MATE desktop. Running dpkg -s mate-desktop, I saw that MATE had been changed to 1.8 from the previous 1.6 version. My first…
My 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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