sjas

Installing Ubuntu 16.04 with btrfs using debootstrap

Partition layout

First, create a GPT partition table.

boot partition, label: EFI, flags: boot + ESP; size: 1GB, format to FAT32;
root partition (label: root), must same size on all devices!
swap partition.

channel operator quick reference

direct discussion about administrative action away from the main channel and into #reddit-diabetes-ops to minimise disruption. our -ops channel is the place where users should come to ask for our help. examples:

any sort of operator request or discussion of channel administration in the main channel
PMs asking why a ban was set
reports of harassment (unless the user is confiding in you)
any request for operator action

changing channel access permissions

tl;dr:

mostly, hosts ignore the mss sent
most of the interesting behaviour comes from the extremes: mss=1 and mss=1440
setting mss=(an atypical value, say 1275 or 1411) ought to spot hosts that simply reflect MSS values
setting mss=1024 apparently will spot a bunch of (Microsoft?) hosts returning MSS=956
passively, mss=1220, 1360, 1410 may help identify CDN/non-CDN nodes inside yahoo/edgecast, google, facebook respectively

Longer version: captured SYN+ACK+MSS values:

Variation is less than I initially thought; just enough for me to notice

This is an approach to generate dynamically a JSON representation of an OID tree (=an(y) SNMP MIB) using mibdump.py of python pysmi.

We will generate a flat list of OID objects (oid_catalog.json) + hierarchical json tree (oid_tree.json) with "."-separated nodes of RFC 1213 MIB.

1. Setup + get MIB(s) as JSON

$ pip install pysmi
# walk into and/or create a new directory you run the following command in
$ mibdump.py --destination-format=json --generate-mib-texts --build-index --mib-stub= RFC1213-MIB

Warnung an alle, die dieses Gist finden: Ich habe hier nur dokumentiert, was ich im Rahmen einer Umstellung herausgefunden habe. Es gibt Garantie auf Richtigkeit der Informationen, Zusammenhänge oder ob das unter allen Umständen wie hier beschrieben funktioniert.

Predictable Network InterfaceNames

Debian stellt auf ein anderes System von Namen für Netzwerkinterfaces um. In Debian 9 gehen noch die alten, manuell festgelegten - was der Standard ist, wenn man von Debian 8 aktualisiert.
Ab Debian 10 wird dieses System, welches mit udev und systemd zusammen hängt, zum Standard.

Mit zless /usr/share/doc/udev/README.Debian.gz kann man Debian-spezifische Informationen zu dem Thema finden.
Unter anderem auch, dass (und wie) man diesen Mechanismus in Debian 9 Stretch umgehen kann.

Go (Golang) GOOS and GOARCH

All of the following information is based on go version go1.8.3 darwin/amd64.

A list of valid GOOS values

(Bold = supported by go out of the box, ie. without the help of a C compiler, etc.)

android
darwin

	package main

	import (
	"net/http"
	"database/sql"
	"fmt"
	"log"
	"os"
	)

	class DotGenerator(Visitor):
	def __init__(self):
	super().__init__()
	self.lines = []
	self.next_id = 0

	def make_name(self, node, name=None):
	if name is None:
	name = "n%d" % self.next_id
	self.next_id += 1

	import argparse
	from mock import Mock

	m = Mock()

	parser = argparse.ArgumentParser()
	subparsers = parser.add_subparsers()

	query_group = subparsers.add_parser('query')
	add_group = subparsers.add_parser('add')

	#!/usr/bin/env python
	#
	# Parses the output of storcli:
	# storcli /c0 show all J

	import sys
	import json

	output_dir = "."
	data = json.load(sys.stdin)