DavidVentura

# Simple linux tun/tap device example tunnel over udp
# create tap device with ip tuntap add device0 tap
# set ip address on it and run tap-linux on that device and set desitation ip
# run same on another node, changing dst ip to first node

import fcntl
import struct
import os
import socket
import threading

mikesager

If you've added some runcmd lines to your cloud-init config, and the commands don't seem to be executing, here's a few things you should know:

WTF is going on?

1. runcmd only has code to "shellify" your strings or array of strings (i.e: turns them into a shell script)
2. runcmd will only write a shell script into the file /var/lib/cloud/instance/scripts/runcmd
3. runcmd is part of the cloud_config_modules boot stage
4. You need to execute that runcmd shell script using the scripts-user module
5. scripts-user is part of the cloud_final_modules boot stage

programmer131

How to clear ip addr, link
ip link delete vxlan2
ip addr del 192.168.0.55/24 dev vxlan2
VxLAN setup
Machine 1
ip link add vxlan1 type vxlan id 1 remote 192.168.18.48 dstport 4789 dev wlp2s0
ip link set vxlan1 up
ip addr add 192.168.0.6/24 dev vxlan1
Machine 2
ip link add vxlan1 type vxlan id 1 remote 192.168.18.24 dstport 4789 dev wlp3s0\

nasirhafeez

FreeRADIUS Advanced Use Cases

Contents

Introduction

Installation

Expiration

djoreilly

#!/bin/bash
set -xe

# $0 host dev remote_ip
# host is 1 or 2
# on vmA
# ./mk-vx.sh 1 ens3 10.10.10.9
# on vmB
# ./mk-vx.sh 2 ens3 10.10.10.15

vaughany

# Remap prefix from 'C-b' to 'C-a'.
unbind C-b
set-option -g prefix C-a
bind-key C-a send-prefix

# Reload config file.
bind-key r source-file ~/.tmux.conf\; display ' Reloaded tmux config.'

# Split panes using | and -.
bind-key | split-window -h -c '#{pane_current_path}'

raveenb

Connecting to an Android device over SSH

Initial Setup

Install Android App Termux from APKPure or AppStore. If the app exists, just delete and re-install it to get the latest version, The APK can be downloaded from https://apkpure.com/termux/com.termux/ Install the APK using by running

adb install ~/Downloads/Termux_v0.73_apkpure.com.apk

vicsperry

Enable GLX Support in a VNC Environment on Ubuntu 16.04 - TurboVNC and VirtualGL

Vic Sperry, 02 Jun 2019

Problem

I've been using a *nix VNC server and client since about 2004. Within the last several years, however, I am increasingly running into applications that demand support for GLX. On Ubuntu, GLX works out of the box if you're sitting at a physical terminal connected to your Linux machine, but if you're using a headless server or some other virtual X-windows environment, you might see something like this:

Xlib:  extension "GLX" missing on display ":1"

One solution for this problem is to run TurboVNC and VirtualGL to create your VNC server. That's what I address here. If you're trying to use something like VirtualBox on Windows to create a virtual Ubuntu, that's out of my realm of experience.

edwintcloud

#!python


class CircularBuffer(object):

    def __init__(self, max_size=10):
        """Initialize the CircularBuffer with a max_size if set, otherwise
        max_size will elementsdefault to 10"""
        self.buffer = [None] * max_size
        self.head = 0

nileshsimaria

1. Take a backup of docker.service file.
   $ cp /lib/systemd/system/docker.service /lib/systemd/system/docker.service.orig

2. Modify /lib/systemd/system/docker.service to tell docker to use our own directory 
   instead of default /var/lib/docker. In this example, I am using /p/var/lib/docker
   
   Apply below patch.

   $ diff -uP -N /lib/systemd/system/docker.service.orig /lib/systemd/system/docker.service
   --- /lib/systemd/system/docker.service.orig	2018-12-05 21:24:20.544852391 -0800