Tasks
=====

* latest

  * lxc private network: reach out
    * /etc/sysctl.conf net.ipv4.ip_forward=1 | /proc/sys/net/ipv4/ip_forward
    * /etc/network/interfaces → up iptables -t nat -A POSTROUTING -o br0 -j MASQUERADE
    * iptables -t nat -A POSTROUTING -o br0 -s 10.0.0.0/8 -j MASQUERADE
  * hexdump -C -v file_path
  * qemu-system avoid junk like floppy: -nodefaults -vga virtio
  * xtra.squashfs empty media/data ← lib/live/mount/medium + data auto fstab
  * grub-bios-setup not functionin with boot.img in an overlay fs
  * qemu-system-x86_64 -initrd initrd.img -kernel vmlinuz -append root=/dev/sda1
  * adduser user kvm for -enable-kvm
  * qemu-img convert -p -O format input.ext output.ext
  * qemu-img create -f format -o ?
  * qemu-img create -f format name.ext [size]
  * qemu-img info name.ext
  * modprobe nbd
  * qemu-nbd -c /dev/nbd? name.ext
  * qemu-nbd -d /dev/nbd?
  * qemu-system-x86_64 -enable-kvm -display sdl -m 2048 -drive file=name.ext,if=virtio
  * sys: firmware-{misc-nonfree,netxen,realtek}
  * catimg
  * mount -t overlay overlay -o lowerdir=squashmount,upperdir=rwdir,workdir=emptydir squashfs-root
  * optipng
  * grub/efi: no biosdisk or ntldr
  * chromium as alternate browser
  * ['sphinx.ext.graphviz'] ⋅ graphviz_output_format = 'svg'
  * remove users' .bashrc files
  * deb [arch=amd64,i386] → /etc/apt/sources.list
  * /etc/localtime -> /usr/share/zoneinfo/Europe/Paris
  * /etc/timezone ← Europe/Paris
  * /usr/local/share/ca-certificates ⇒ update-ca-certificates
  * debian: buster/updates signed with archive-7 key
  * .git/config ← receive.denyCurrentBranch = updateInsted
  * python3: mutables persistent as constructors default
  * atop, jq, netcat
  * dependencies: readelf → ldd
  * DebFromScratch: tasks
  * /etc/dhcp/dhclient.conf no overwrite resolv.conf
  * Dir::Etc::sourceparts "";
  * Acquire::Check-Valid-Unitl false;
  * APT::Install-Recommends "false";
  * APT::Install-Suggests "false";
  * debootstrap: minbase
  * debootstrap: umount machine-id afterwards
  * machine-id: /etc empty ⋅ /var/lib/dbus useless
  * DEBIAN_FRONTEND="noninteractive" for apt install
  * console-setup -> /etc/default/keyboard
  * console-data -> loadkeys fr
  * org.gnome.desktop.media-handling.autorun-never true
  * org.gnome.desktop.interface.text-scaling-factor 1.5
  * AppArmor/lxc? lxc.aa_profile = unconfined
  * graphviz
  * tig
  * upx-ucl
  * ?/vmlinuz apparmor=0 (KO backports profiles)
  * LD_LIBRARY_PATH=path/to/libs path/to/executable
  * upx --best executable
  * nuitka --portable --python-version=3.5 --remove-output --show-progress --show-modules main.py
  * bpython3
  * sphinx configuration
  * __git_complete gco _git_checkout
  * git LFS
  * apt-mirror
  * DEBIAN_FRONTEND=noninteractive for keyboard-configuration interactive prompt
  * sudo, sudoers
  * sqlite
  * umask
  * node, process.umask(2)

* critical

    * ~/.config/gtk-3.0 → bookmarks ⋅ settings.ini
    * dbus-run-session -- gsettings set key value
    * gsettings get key
    * linux: ram merges live-media-path's squashfs files but not fully in RAM
    * linux: toram=xxx.squashfs
    * ram disk size argument
    * panic kernel argument for seconds to automatically reboot
    * ! manual build of live-boot system's initrd.img after kernel upgrade

    * /etc/skel
    * auto-update if firefox archive in ~/.local

    * ? systemd-sysv ↔ linux-image-amd64 ↔ live-boot
    * ! GUI keyboard-configuration /etc/default/keyboard

    * reference missing mkdocs strict option

    * apt-transport-https
    * dhcpcd

    * handle upstream GPG public keys
    * check authenticity mirrors with GPG

    * lxc-create packages

      * ${init}
      * ifupdown
      * locales
      * dialog
      * isc-dhcp-client
      * netbase
      * net-tools
      * iproute
      * openssh-server

* extra

    * json.load(f, object_pairs_hook=collections.OrderedDict)
    * tty screenshot → sudo fbcat > name.ppm
    * consoleblank=0 / setterm --blank 0
    * on-the-fly LibreOffice documents conversion
    * send emails as own domain name's alias
    * personal GPG key signature

Network interfaces
------------------

* /etc/network/interfaces

.. code:: shell

  source /etc/network/interfaces.d/*

* /etc/network/interfaces.d/lo

::

  auto lo
  iface lo inet loopback

* /etc/network/interfaces.d/eth0

::

  auto eth0
  iface eth0 inet dhcp

Name resolution
---------------

* /etc/hosts

::

  127.0.0.1 localhost

  ::1 localhost