VirtualTam's bookmarks

1. Etching PCBs at Home for Fun and Profit 2024-10-26

   tags: chemistry, diy, electronics, pcb, printer, solder

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2. Vaughan Hilts - Using Huginn for profit and fun; finding price errors on the Internet 2019-01-05

   tags: automation, feed, huginn, network/http, programming/ruby, web/scraping, web/syndication

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3. Fighting spam for fun and profit 2018-11-16

   tags: email, email/milter, email/spam

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4. ccache & distcc w/ clang – oliver hu 2018-10-06

   tags: compiler, compiler/cache, compiler/clang, compiler/gcc, distributed, network, programming/c, programming/c++

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   • https://petereisentraut.blogspot.com/2011/05/ccache-and-clang.html
   • https://petereisentraut.blogspot.com/2011/09/ccache-and-clang-part-2.html
   • http://peter.eisentraut.org/blog/2014/12/01/ccache-and-clang-part-3/
   • https://pspdfkit.com/blog/2015/ccache-for-fun-and-profit/
   • https://pspdfkit.com/blog/2017/crazy-fast-builds-using-distcc/
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. Shodan 2018-01-09

   tags: device, hack, internet-of-things, network, privacy, security

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   • https://news.ycombinator.com/item?id=5512477

   • https://thehackernews.com/search/label/shodan

   • https://www.forbes.com/sites/kashmirhill/2013/09/05/the-crazy-things-a-savvy-shodan-searcher-can-find-exposed-on-the-internet/#7d00f4f23c7e

   • https://www.wired.com/2013/05/googles-control-system-hacked/

   • https://www.forbes.com/sites/andygreenberg/2011/11/09/researchers-spot-blue-coat-web-control-gear-in-another-bad-regime-burma/#6a615a3e329c

   • https://www.forbes.com/sites/kashmirhill/2013/08/13/how-a-creep-hacked-a-baby-monitor-to-say-lewd-things-to-a-2-year-old/#3ce17adcaad6

   • https://raidforums.com/Thread-Using-Shodan-for-Fun-and-Profit

7. SSH tunnelling for fun and profit: Autossh 2017-08-18

   tags: forward, linux, network, network/ssh, port, tunnel

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   • https://apple.stackexchange.com/questions/132223/autossh-not-forwarding-regular-ssh-tunnel-does
   • https://unix.stackexchange.com/questions/190026/persistent-ssh-port-forward-without-public-keys
   • https://serverfault.com/questions/414008/how-to-create-a-persistent-port-forwarding-using-ssh
   • https://help.ubuntu.com/community/SSH/OpenSSH/PortForwarding
8. Apache: use /etc/hosts to resolve local hosts & use them for virtualhost definition 2015-06-07

   tags: apache, domain, host, local, programming/testing, virtual, web

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   Pro: no need to setup a DNS server to test virtualhosts Con: keep in mind that all "fake" hosts will point to 127.0.0.1!

   1. Use /etc/hosts to declare test hosts / domains / subdomains

   #<ip-address>	<hostname.domain.org>	<hostname>
   127.0.0.1	localhost.localdomain	localhost
   127.0.0.1	host.localdomain	host
   127.0.0.1	sub.host.localdomain	sub.host
   ::1		localhost.localdomain	localhost
   

   2. Allow per-user virtualhost definition in either (depending on your distro)

   • /etc/httpd/conf/httpd.conf
   • /etc/apache2/apache2.conf

   Include /home/albert/.httpd/*.conf

   3. Profit! Create virtualhosts with local hostnames :)
9. Git your life for fun & profit 2015-03-23

   tags: control, development, presentation, source-code-management/git, version

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10. La survie de l’espèce, ou pas… : Reflets 2013-09-30

    tags: bd, capitalism, company, humankind, profit, society

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