VirtualTam's bookmarks

13 bookmarks found

  1. Educational Technology Clearinghouse - Resources 2024-11-10
    tags: education, geography, image, map, presentation
    [ permalink ]
    • Clipart ETC - Illustrations
    • Clippix - Photos and pictures
    • Maps - Historic maps spanning many different time periods
    • Presentations - Backgrounds, templates, letters, frames, and buttons
  2. ripgrep-all: rga: ripgrep, but also search in PDFs, E-Books, Office documents, zip, tar.gz, etc. 2021-11-12
    tags: command-line, grep, linux, metadata, pdf, programming/rust, search
    [ permalink ]
  3. numfmt - reads numbers in various representations and reformats them as requested 2018-09-24
    tags: bit, byte, file, filesystem, gnu, size, unit
    [ permalink ]
  4. 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
    [ permalink ]

    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!
  5. etckeeper 2017-03-03
    tags: configuration, etc, linux, source-code-management, source-code-management/git
    [ permalink ]

    https://git.joeyh.name/?p=etckeeper.git;a=summary via https://opensource.com/article/17/3/etckeeper-version-control

  6. 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
    [ permalink ]

    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
    1. 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

    1. Profit! Create virtualhosts with local hostnames :)
  7. Python unit testing frameworks: Nose, Pytest 2015-02-13
    tags: code, coverage, feature, nose, programming/python, programming/python/pytest, programming/testing, quality, unit
    [ permalink ]

    Python's built-in unittest module is quite cool, but a bit limited and way too verbose (read: it's quite not easy to incite developers to write unit tests)

    I'm currently looking for more dev-friendly solutions, the key points being:

    • writing test code should be easy and straight-forward -keep the focus on "what to test" instead of "how to transcribe a process to a test"
    • parallelization! -we, spoiled developers, should make good use of our way-too-many-cores build machines...
    • complete feature set!
      • we don't want to just run tests...
      • coverage reports (find dead/weak/untested code sections)
      • output formatting (JUnit-XML seems to be quite a common format out there)

    There seem to be 3 solutions in Python:

    • stock unittest + project-dependent customizations / test helpers
    • nosetests
    • py.test

    And 2 ways of gettings things done:

    • keeping things stock: no external dependency, project-specific implementation...
    • using a test framework: one more module in your (test) virtualenv, more concise tests, more features (// run, code coverage, etc.)

    Some links:

  8. Des AILES pour les ESIALIENS ! 2015-02-08
    tags: agency, cadre, consultant, informatics, job, mission, ssii
    [ permalink ]

    Mine d'infos concernant les statuts et (bonnes... ou pas) pratiques en SSII : contrats, embauche, démission, fin de mission, etc.

    Attention, le contenu n'est pas toujours à jour (2003), et pique un peu les yeux !

  9. ALSA: multiple USB sound cards 2015-01-12
    tags: audio, card, device, linux, linux/alsa, sound
    [ permalink ] 
    # /etc/modprobe.d/snd_usb_audio.conf
options snd_usb_audio vid=<vid1>,<vid2> pid=<pid1>,<pid2> index=<index1>,<index2> enable=1,1

    example:

    # 5: M-Audio Fast Track Pro 
# 6: Focusrite Scarlett 6i6
options snd_usb_audio vid=0x763,0x1235 pid=0x2012,0x8012 index=5,6 enable=1,1

    See also: http://alsa.opensrc.org/MultipleCards

  10. Starting and Accessing Jenkins 2015-01-09
    tags: continuous-integration, continuous-integration/jenkins, memory, performance, programming/java, service, virtual
    [ permalink ]

    To increase the memory allocated and available:

    # /etc/default/jenkins
JAVA_ARGS=&quot;-Xms4G -Xmx16G -Djava.awt.headless=true&quot;

    See also

  11. PulseAudio Modules 2015-01-08
    tags: audio, linux, modules, pulseaudio
    [ permalink ]

    Tweak which modules are loaded in either: /etc/pulse/default.pa ~/.config/pulse/default.pa

  12. Linux: environment variable definition locations 2014-11-10
    tags: configuration-management/saltstack, environment, linux, network/ssh, path, programming/shell, programming/shell/bash, session, sysadmin, unix, variable
    [ permalink ] 
     1# Global
 2/etc/environment
 3
 4# X Session
 5/var/lib/AccountsService/users/<username>
 6~/.dmrc
 7~/.xinitrc
 8~/.xprofile
 9
10# Session
11/etc/profile
12/etc/profile.d/*.sh
13~/.profile
14
15# Bash
16/etc/bash.bashrc
17~/.bash_profile
18~/.bashrc
19
20# ZSH
21/etc/zsh/zprofile
22~/.zshrc
23
24# Locales
25/etc/locale.conf
26/etc/locale.gen
27~/.config/locale
28
29# Superusers
30/etc/login.defs
31/etc/sudoers (use visudo to edit)
32
33# SSH
34/etc/ssh/sshd_config (server-side, can allow the client to pass variables)
35/etc/ssh/ssh_config (client-side, can send variables to servers)
36
37# SaltStack
38/etc/default/salt-minion (not always included in the distro's packages)
  13. Développement système sous Linux - Editions Eyrolles 2013-08-19
    tags: development, glibc, linux, programming/c, sysadmin, system, unix
    [ permalink ]

    Etude de glibc pour les applications bas niveau : multitâches, ordonnancement, etc.