I had to rebuild VM recently, and I want to record what I did to get it to boot.
Continue readingBooting a vm using virt-install (revisted)
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Category Archives: Software
Building internal Automation
One of my responsibilities on the Linux Kernel team is to build our version of the Linux Kernel from distinct branched in a git repo. Our approach is a little different than most organizations, and so we have custom code to implement our logic. Over time, I have come to realize a few patterns that make our lives easier in how I approach organizing this code.
Continue readingFind the IP address of a machine I just booted
I am booting VMs via qemu (no libvirt) and sometimes they don't tell me what IP address they got when booted. To figure it out, considering I know the IP address, I can query the network via the Address Resolution Protocol (ARP)
I know they get address in sequence, so:
ayoung@sut11sys-r112:~/devel/ampvirt$ arp -n | grep -i "52:54:00:70:0c:"
10.76.112.154 ether 52:54:00:70:0c:02 C virbr0
10.76.112.153 ether 52:54:00:70:0c:04 C virbr0
10.76.112.155 ether 52:54:00:70:0c:03 C virbr0Teaching Python using a Caesar Cipher
A Caesar cipher is a letter for letter exchange from a clear text to a encrypted text by shifting a set distance in the alphabet. Thus, if your set distance is 2, the letter A becomes C, the letter X becomes Z. To encrypt the last letters of the alphabet, you wrap around to the beginning, so Y becomes A and Z becomes B.
Caesar is commonly respelled to Ceasar, which I have done for this article. Use the spelling of your choice.
This is a fairly easy algorithm to code, and makes for a decent early class in python. Here are the steps I would go through to teach someone:
Downloading from gitlab
We use gitlab to post internal releases of archives. I want to be able to automate the process of downloading these artifacts. Here it is using the glab CLI.
Continue readingDebugging Rust in Vim
On Fedora:
yum install termdebugin ~/.vimrc
let g:termdebug_config = {}
let g:termdebug_config['command'] = 'rust-gdb'
packadd! termdebug
Inside vim:
Termdebug target/debug<executable>
Use Ctrl-W DownArrow to switch between windows
Use :Break to set a breakpoint in the code window
Use Ctrl-W UpArrow to go to the gdb window
use run to run the program and cont to continue after hitting a break point.
Selecting a subset of files for ctags
I usually don’t want all of the files in the linux Kernel for my ctags. Sometimes I want a cvery small subset: a set of C files and the included header files.
Continue readingFixing my virt Network
I got my network working again, and this time I am running the VM as non-root user.
Continue readingResizing filesystem on A Fedora 43 Cloud image
THe cloud image is shipped as a qcow2 file. It has about 3 GB of usable space. I need more.
Continue readingNetwork setup for a custom Qemu Virtual Machine
After building a custom Qemu, there are a couple ways to run a VM to get to it. The older approach to VM management is to create a block device, run the VM with a boot device, do a full install and log in to the serial console. However, if you run the Qemu/KVM machine from the command lilne, hitting control C will stop your VM, and this is annoying. I have found it worth while to set up networking and then to SSH in to the machine.
My notes here suck. I am going to try and document what I have here working, and, over time, reverse engineer how I got here.
Edit: here are the steps