Scratchbook

Das Leben ist immer anders als die Realität.

Liftwurf: CoreOS

Claude, 30. Oktober 2018, 13:42 Uhr

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Wenn man Docker kennt, braucht man eigentlich keine anderen Serverdienste mehr.
apt-get install docker-ce ist alles, was ich bei einem neuen Server noch installiere.
Der Rest sind Container und Portweiterleitungen auf ebendiese.

Nun – gibt es eigentlich ein minimales OS, welches nur noch Container laufen lässt?
Sozusagen ein Kernbetriebssystem, welches Container startet?
Sowas gibt es. Darf ich vorstellen:

CoreOS

  • Basierend auf Gentoo
  • Minimales Betriebssystem
  • Kernel und Containerwerkzeuge
  • Minimale Angriffsoberfläche
  • SELinux hält schützend seine Schwingen über die einzelnen Container
  • In den Containern selber kann ich machen, was ich will
  • Automatische Betriebssystemupdates inkl. Kernel

A-B Partitionsschema

  • CoreOS hat ein A-B Partitionsschema
  • /usr ist schreibgeschützt eingehängt und jeweils Partition A oder B
  • Firmwareupgrade: Partition A ist aktiv, ich schreibe das Image bitgenau auf die B-Partition
  • Bei Erfolg wird B aktiviert und beim nächsten Boot von B gestartet
  • Falls etwas schiefging, wird wieder A aktiviert, als ob nichts passiert wäre
  • Stecker ziehen während einem Firmwareupdate? Kein Problem.
  • /usr löschen? Ist schreibgeschützt…
  • / ist auf eigener Partition eingehängt
  • Betriebssystem zurücksetzen? rm -rf –no-preserve-root /

Kernelaktualisierung ohne Unterbruch

  • Mehrere CoreOS-Rechner im Verbund
  • etcd ist ein distributed key value store
  • Ein Rechner meldet an etcd: „Ich mache jetzt dann gleich einen Neustart“
  • Die anderen Rechner sind informiert und warten. Rechner kommt wieder hoch: „Ich bin fertig.“
  • Der nächste Rechner startet neu
  • Niemand bemerkt einen Unterbruch von aussen

CoreOS-Image selber bauen

curl -L -o cork https://github.com/coreos/mantle/releases/download/v0.11.1/cork-0.11.1-amd64
chmod +x cork && mv cork /usr/local/bin/
mkdir coreos-sdk
cd coreos-sdk
cork create
cork enter
./setup_board --default --board=amd64-usr
./build_packages
./build_image

Fertig.

Dein Image liegt hier: ./coreos-sdk/src/build/images/amd64-usr/developer-latest/coreos_production_image.bin

Image für eine Installation vorkonfigurieren

  • Netzwerkboot vom Grundimage, Anpassungen mit einer JSON-Konfigurationsdatei: ignition.json
  • Dort kannst du SSH-Keys, Benutzeraccounts, Passwörter, Systemd-Units und ganze Dateien definieren
  • Die werden nach der Imageinstallation geschrieben

coreos.com

Zum Genderwahnsinn

Daniel, 19. Oktober 2018, 22:54 Uhr

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Intergenerationale Beziehungen

Claude, 15. Oktober 2018, 15:17 Uhr

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Die Geschichte der intergenerationalen Beziehungen ist integraler Bestandteil der Geschichte der Menschheit selbst. So wie Erfindungen von einer Notwendigkeit angetrieben werden, sind solche Beziehungen in der menschlichen Gesellschaft zur Norm geworden, weil sie eine Lösung für ein soziales Bedürfnis darstellen.

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Wahlcomputer sind sicher…

Claude, 4. Oktober 2018, 12:21 Uhr

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…ausser die Chinesen haben vorher das Mainboard mit einem Chip verwanzt, der nicht grösser ist als eine Bleistiftspitze, mit voller Netzwerkfunktionalität und Speicherverwaltung.

Ein Computer auf dem Computer, um den Computer zu manipulieren. Bis vor kurzem wusste niemand etwas davon – nicht Amazon, nicht Apple, nicht die CIA.

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Liftwurf: Mit Docker auf https in 20 Sekunden

Claude, 1. Oktober 2018, 22:49 Uhr

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