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„Ein Kompressor, der macht doch die lauten Geräusche leiser und die Leisen lauter. Ich will die Dynamik beibehalten; die Leute können ja die Lautstärke hochregeln.“ – so habe ich bisher gedacht. Und dann am Winterkongress gemerkt: Manchmal reden die Moderatoren laut, manchmal leise. Die Zuhörer wollen die Lautstärke nicht ständig lauter und leiser drehen – einheitlich soll es sein!

Aber wie kriege ich das so hin, dass das Signal nicht so zusammengestaucht tönt? Ich will eine Radiostimme, die dem Zuhörer mit der Faust ins Gesicht springt; jedes Fäserchen und die rauhe Textur der Stimme beim entspannten Reden soll hörbar sein. Das tut es nämlich bei einem unkomprimierten Signal nicht, weil diese Teile der Stimme zu leise sind.

Die meisten YouTube-Videos befassen sich nur mit dem Kompressor, das Resultat ist mittelmässig bis verzerrt. Ein Setup jedoch gefällt mir auf Anhieb, und nach ein wenig Nachbau und Feinschliff komme ich zu folgenden Einstellungen:

Was bedeutet das alles und was passiert hier?

[mehr…]

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Brave Browser, das ist Google Chrome ohne die Spionagefunktionen.

Werbeblocker?

Eingebaut! Standardmässig aktiviert.

Blockiert Tracker, stellt Verbindungen auf https um sofern verfügbar.

Finanzierung und Fortbestand

Über das eingebaute, freiwillige Werbenetzwerk: Brave Rewards. Kann ein- oder ausgeschaltet werden. Surfer finanzieren Inhaltsersteller mit Trinkgeld, das sie mit dem Anschauen von Werbebannern aus dem Brave-Netzwerk verdienen.

Opensource?

Natürlich: github.com/brave

Download

brave.com

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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

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

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Kennen Sie das auch? Überall Flecken, Zertifikatsfehler und die Dreckspuren von unverschlüsselten Daten bei ihrem neu eingerichteten Webdienst?

Damit ist jetzt Schluss!

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• Anwendungen werden zusammen mit allen Abhängigkeiten in einen Container verpackt – lauffähig.
• Beliebige Betriebssysteme, beliebige Programmbibliotheken in beliebigen Versionen laufen lassen – gleichzeitig und nebeneinander.
• „Ich brauch aber Ruby 1.8 und meine Anwendung läuft nur auf Debian Steinzeit!“ – ja dann ists halt so, kein Problem.
• Beliebig Scheiss in den Container installieren, sudo rm -rf / –no-preserve-root – nach dem Verlassen wird der Container wieder auf den Ursprungszustand zurückgesetzt.

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Klick auf das Bild für die grosse Version

Monitoring mal richtig

• Zwei Go-Binaries, direkt ausführbar: prometheus und node_exporter
• node_exporter: Läuft auf dem System, von dem man Monitoringwerte auslesen will und stellt sie zur Verfügung
• prometheus: Monitoring-Dienst, der die Werte von allen node_exportern holt und speichert

In diesem Beispiel:

• node_exporter hat „textfile collectors“ aktiviert
• holt sich Textdateien im Verzeichnis /var/lib/textfile_collectors
• Debian-Version wird als Text in dieses Verzeichnis gespeichert, kann von beliebigen Skripts erstellt werden
• node_exporter stellt seine Werte unter http://zielhost:9000/metrics zur Verfügung
• unser erstellter Wert wird nun dort angezeigt

Dann auf dem Monitoringserver:

• Starte prometheus -config.file=prometheus.yml
• prometheus.yml: Welche Hosts und wie oft?
• Prometheus-Interface läuft auf http://monitoringserver:9090
• debian_version ist dort verfügbar

Optional:

• Alertmanager: Mehrstufige Alarmierung mit Eskalationsebenen, Trendalarmierung (=wenn der Speicherplatz so weiterschrumpft wie jetzt, haben wir in X Tagen keinen Platz mehr; Alarm!)
• Grafana: Grafische Darstellung aller Werte; konfigurierbar, beliebige Zeiträume und Werte in der Vergangenheit vergleichen
• Grafana Beispiel: dashboard.enigmabox.net

Website: https://prometheus.io

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Elevator Pitches sind Verkaufsgespräche, die so kurz sind, dass sie das Produkt während einer Liftfahrt vorstellen. An dieser Stelle werde ich künftig unter der neuen Kategorie „Liftwurf“ allerhand nützliche Sachen rund um Computer vorstellen.

Der Beitrag „Prometheus: Monitoring mal richtig“ hängt schon seit einem Jahr in den Entwürfen; und soeben habe ich erfolgreich ein Kubernetes-Cluster in Betrieb genommen. Material für lange Blogbeiträge, zu denen ich mich dann nicht aufraffen kann. Die Quintessenz lässt sich aber in einem Bild oder einem animierten Gif darstellen. Warum also nicht?