mvandermeulen

Tabs and Windows

Function	Shortcut
New Tab	⌘ + T
Close Tab or Window	⌘ + W (same as many mac apps)
Go to Tab	⌘ + Number Key (ie: ⌘2 is 2nd tab)
Go to Split Pane by Direction	⌘ + Option + Arrow Key
Cycle iTerm Windows	⌘ + backtick (true of all mac apps and works with desktops/mission control)

mvandermeulen

• With Docker 1.8.0 shipped new log-driver for GELF via UDP, this means that the logs from Docker Container(s) can be shipped directly to the ELK stack for further analysis.
• This tutorial will illustrate how to use the GELF log-driver with Docker engine.
• Step 1: Setup ELK Stack:
  • docker run -d --name es elasticsearch
  • docker run -d --name logstash --link es:elasticsearch logstash -v /tmp/logstash.conf:/config-dir/logstash.conf logstash logstash -f /config-dir/logstash.conf
  • Note the config for Logstash can be found at this link
  • docker run --link es:elasticsearch -d kibana
• Once the ELK stack is up now let's fire up our nginx container which ships its logs to ELK stack.

• LOGSTASH_ADDRESS=$(docker inspect --format '{{ .NetworkSettings.IPAddress }}' logstash)
• `docker run -d --net=host --log-driver=gelf --log-opt gelf-address=u

mvandermeulen

#!/bin/bash

if [ "$1" = "-h" -o "$1" = "--help" -o -z "$1" ]; then cat <<EOF
appify v3.0.1 for Mac OS X - http://mths.be/appify
Creates the simplest possible Mac app from a shell script.

Appify takes a shell script as its first argument:

    `basename "$0"` my-script.sh

mvandermeulen

#!/bin/bash

# change the values below to match your system.

# target the BUILD_DIR to output from an nw.io build process. nwjs-shell-builder recommended!
# https://github.com/Gisto/nwjs-shell-builder
# BASE_DIR is the target directory for this script, where files will be gathered and packaged to 

BUILD_DIR=”/var/www/deploy/TMP/osx-ia32/latest-git”
BASE_DIR=”/var/www/deploy/osx” 

mvandermeulen

#!/bin/bash
# herein we backup our indexes! this script should run at like 6pm or something, after logstash
# rotates to a new ES index and theres no new data coming in to the old one. we grab metadatas,
# compress the data files, create a restore script, and push it all up to S3.
TODAY=`date +"%Y.%m.%d"`
INDEXNAME="logstash-$TODAY" # this had better match the index name in ES
INDEXDIR="/usr/local/elasticsearch/data/logstash/nodes/0/indices/"
BACKUPCMD="/usr/local/backupTools/s3cmd --config=/usr/local/backupTools/s3cfg put"
BACKUPDIR="/mnt/es-backups/"
YEARMONTH=`date +"%Y-%m"`

mvandermeulen

Download the latest Raspbian Lite image from https://www.raspberrypi.org/downloads/raspbian/ (2020-02-13 at the time of this writing).

Insert your microSD card. Use balenaEtcher to burn the image to your microSD card.

Ensure the disk is mounted again, then enable SSH.

$ touch /Volumes/boot/ssh

mvandermeulen

Start up a container (whichever Linux flavour takes your fancy):

docker run -it ubuntu /bin/bash
docker run -it centos /bin/bash

• top: check what CPU and Memory running processes are utilising
• ps: see what processes are running
• strace: monitor interactions between processes

mvandermeulen

You'll need

• Raspberry Pi 3, 3+ or 2 (only)
• A Linux PC, laptop or Raspberry with SD card reader/slot
• A number of Raspberry Pis configured with Ethernet

You must have an SSH key, if you don't know what this is then type in ssh-keygen and follow the instructions.

Prepare to provision RPis:

mvandermeulen

Resources

macOS install itself is quite easy using OSX-KVM scripts

Virtual Intel GPU GVT-g stuff

igpu setup is quite easy by following instructions on Arch Linux wiki

• https://wiki.archlinux.org/index.php/Intel_GVT-g

mvandermeulen

How to build a load balancer with BGP and ECMP using VyOS

According to this cloudflare blog article "Load Balancing without Load Balancers", we can build a rock-solid load balancer only using a router. All the magic comes from BGP and Equal-Cost Multi-Path routing.

In this howto, I will use bird as BGP router on linux instance (ie. servers).

Test environment

I use GNS3 with this architecture :