VirtualTam's bookmarks

1. USENIX - FreeBSD on Firecracker 2024-05-04

   tags: algorithm, bsd/freebsd, hardware/acpi, virtualization/firecracker, virtualization/hypervisor

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   • FreeBSD can now boot in 25 milliseconds on AWS Firecracker
2. distri: 20x faster initramfs (initrd) from scratch 2020-01-30

   tags: boot, linux, linux/kernel, programming/go, programming/shell

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   • https://github.com/distr1/distri/blob/master/cmd/distri/initrd.go
3. AWS | Enable Enhanced Networking with Elastic Network Adapters for vintage OS AMIs 2019-09-17

   tags: chroot, cloud/aws, linux, linux/debian, linux/kernel, virtualization, xen

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   Paravirtual (PV) to Hardware Virtual Machine (HVM):

   • https://stackoverflow.com/questions/24330721/amazon-ec2-how-to-convert-an-existing-pv-ami-to-hvm

   ENA support:

   • https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/enhanced-networking-ena.html
   • https://forums.aws.amazon.com/thread.jspa?threadID=166135
   • https://aws.amazon.com/premiumsupport/knowledge-center/boot-error-linux-m5-c5/
   • https://bugs.centos.org/view.php?id=14107
   • https://ygrene.tech/how-to-enable-ena-support-for-aws-amis-in-5-steps-and-make-your-bamboo-remote-jobs-really-fast-f2a4254a9955

   Build Debian AMIs from scratch:

   • https://bootstrap-vz.readthedocs.io/en/master/
   • https://github.com/andsens/bootstrap-vz
   • https://www.slideshare.net/JamesBromberger/debian-cloud-building-the-debian-amis
   • https://blog.james.rcpt.to/2012/12/06/official-debian-images-on-amazon-web-services-ec2/

   Squeeze:

   • https://lists.debian.org/debian-cloud/2013/02/msg00023.html

   Wheezy:

   • https://lists.debian.org/debian-cloud/2014/10/msg00009.html
   • https://lists.debian.org/debian-cloud/2014/11/msg00000.html

   Boot to chroot:

   • https://unix.stackexchange.com/questions/85714/boot-into-a-chroot
   • https://wiki.debian.org/chroot
   • https://wiki.debian.org/Debootstrap
   • https://superuser.com/questions/384437/booting-linux-system-from-chroot-is-there-a-better-way-to-do-this/384457#384457
   • https://github.com/lemonsqueeze/boot-chroot
4. jib: Build container images for your Java applications. 2018-09-19

   tags: linux/container, linux/container/docker, programming/java, programming/java/maven, security

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   • https://cloudplatform.googleblog.com/2018/07/introducing-jib-build-java-docker-images-better.html
   • https://dzone.com/articles/building-docker-image-for-a-spring-boot-app
   • https://www.reddit.com/r/programming/comments/8xen0j/jib_google_container_tool_for_building_java/
   • https://news.ycombinator.com/item?id=17497026
5. Centos/RHEL 7 - Fix LVM boot issues after migration from ESXi to VirtualBox 2018-04-20

   tags: boot, bootloader/grub, filesystem, filesystem/lvm, fstab, linux, linux/centos, linux/kernel, linux/red-hat

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   Here are the steps I used to migrate a CentOS 7 VM from (presumably?) an ESXi server, to a local VirtualBox environment.

   The LVM volumes were not detected at boot, and after the boot timeout, the OS fell back to the Dracut emergency shell.

   • get a CentOS minimal installation CD
   • check the VM's resources and peripherals:
     • ensure there are no floppy drives (!)
     • setup CPU and RAM resources
     • check virtual drives
     • add an SCSI optical drive if needed
   • optional: convert the virtual drive images from VMDK to VDI
   • mount the CentOS installation disc
   • boot on the installation disc:
     • select "Troubleshooting", then "Rescue"
     • let the rescue utility detect filesystems and mountpoints
   • $ chroot to the detected environment
   • backup files:
     • /etc/fstab
     • /boot/grub/grub.cfg
   • under /boot, backup the initrd and initramfs for the current configuration (these will be overwritten)
   • compare the current /etc/fstab with the output of $ lsblk and $ blkid
   • if needed, manually edit /etc/fstab to use the appropriate block device UUIDs, identifiers and mountpoints
   • regenerate GRUB configuration:
     • $ grub2-mkconfig -o /boot/grub2/grub.cfg
   • if needed, reinstall GRUB:
     • $ grub-install /dev/sda
   • rebuild initrd:
     • $ mkinitrd --force /boot/<initrd_image> <kernel_version>
   • rebuild initramfs:
     • $ dracut --force <kernel_version>
   • exit the chroot
   • unmount the installation disc
   • reboot
   • optional but highly recommended: cross your fingers
   • ...
   • profit!
6. Dracut emergency shell 2018-04-20

   tags: filesystem, filesystem/lvm, linux, linux/kernel

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   • https://superuser.com/questions/1244536/dracut-emerg-shell-mount-lvm2-volume
   • https://unix.stackexchange.com/questions/207593/how-to-make-lvms-at-available-boot-kernel-panic-dracut-cannot-find-logical-vo
   • https://serverfault.com/questions/893721/centos7-dracut-lvm-command-not-found
   • https://www.novell.com/coolsolutions/appnote/19386.html
   • https://fedoraproject.org/wiki/How_to_debug_Dracut_problems
   • https://kb.vmware.com/s/article/1002402
   • https://forums.fedoraforum.org/showthread.php?294909-Need-dracut-emergency-shell-help-regenerate
7. TestDisk - Partition Recovery and File Undelete 2018-01-07

   tags: boot, data, partition, recovery, storage

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8. slacka/WoeUSB: a simple tool to create a USB Windows installer from an ISO image 2018-01-07

   tags: boot, installer, microsoft/windows, usb

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9. GRUB dual-boot considerations 2018-01-05

   tags: boot, bootloader/grub, linux, microsoft/windows

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   • https://wiki.archlinux.org/index.php/Dual_boot_with_Windows
   • https://askubuntu.com/questions/88384/how-can-i-repair-grub-how-to-get-ubuntu-back-after-installing-windows
   • https://www.eightforums.com/tutorials/29504-bios-mode-see-if-windows-boot-uefi-legacy-mode.html
10. Windows - Locate & fix the MBR 2018-01-05

    tags: boot, microsoft/windows, partition, storage

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    • https://superuser.com/questions/510485/how-to-tell-which-physical-disks-have-bootable-mbr
    • https://neosmart.net/wiki/fix-mbr/
    • https://neosmart.net/wiki/reboot-and-select-proper-boot-device/
    • https://askubuntu.com/questions/859685/how-to-delete-the-bootable-flag-of-a-partition
    • https://superuser.com/questions/596919/how-to-set-boot-disk-flag-with-diskpart
11. Boot freeze with linux 4.13 and 4.14 / Kernel & Hardware / Arch Linux Forums 2017-12-21

    tags: ati, boot, gpu, linux, linux/kernel, radeon

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    • https://wiki.archlinux.org/index.php/AMDGPU
    • https://www.phoronix.com/scan.php?page=article&item=linux-413-gcn101&num=1
    • https://bbs.archlinux.org/viewtopic.php?id=232252
12. JHipster - Generate your Spring Boot + Angular apps! 2017-06-08

    tags: development, linux, linux/ubuntu, programming/java, programming/javascript, virtualization/vagrant

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    • https://wiki.ubuntu.com/ubuntu-make
    • https://github.com/jhipster
13. GNU Libreboot 2016-09-05

    tags: boot, firmware, gnu, libre

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    Lenovo Laptops @ https://minifree.org/

14. Boots and Cats 2014-10-22

    tags: bee, boot, cat, kitten, wtf

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