sl0n

{
  "meta": {
    "theme": "flat"
  },
  "basics": {
    "name": "Vladimir Zhigulin",
    "label": "UNIX / Linux System Administrator",
    "summary": "I’m a senior system administrator at Booking.com",
    "website": "http://momonth.now.im/",
    "email": "vladimir.zhigulin@gmail.com",

sl0n

{
  "meta": {
    "theme": "elegant"
  },
  "basics": {
    "name": "Thomas Davis",
    "label": "Web Developer",
    "image": "https://avatars0.githubusercontent.com/u/416209?s=460&u=38f220a2c9c658141804f881c334c594eb1642ac&v=4",
    "summary": "I’m a full stack web developer who can build apps from the ground up. I've worked mostly at startups so I am use to wearing many hats. I am a very product focussed developer who priotizes user feedback first and foremost. I'm generally very flexible when investigating new roles. ",
    "website": "https://ajaxdavis.com",

sl0n

The script helps you restore all installed OpenWRT packages after upgrading the main firmware image via sysupgrade. It works
ONLY if the default firmware image provided by the OpenWRT project is sufficient to get connected to the Internet, but you
want some extra packages for additional functionality. In other words, it WILL NOT WORK if connecting to the Internet
requires installing extra packages (e.g., a kernel module for your LTE modem).

The script has been tested for upgrading from OpenWRT 18.06.1 to 18.06.2 and to a development snapshot, as well as between
development snapshots. On LEDE 17.01.x, "flock" is not a part of the default image, so has to be installed manually.

Initial setup:

sl0n

Thinkfan setup

Note: I configured this thinkfan setup for my old Thinkpad w520 on Ubuntu 17.10.

1. Install necessary programs

Install lm-sensors and thinkfan.

sudo apt-get install lm-sensors thinkfan

sl0n

Install WireGuard via whatever package manager you use.  For me, I use apt.

$ sudo add-apt-repository ppa:wireguard/wireguard
$ sudo apt-get update
$ sudo apt-get install wireguard

MacOS
$ brew install wireguard-tools

Generate key your key pairs.  The key pairs are just that, key pairs.  They can be

sl0n

Typing vagrant from the command line will display a list of all available commands.

Be sure that you are in the same directory as the Vagrantfile when running these commands!

Creating a VM

• vagrant init -- Initialize Vagrant with a Vagrantfile and ./.vagrant directory, using no specified base image. Before you can do vagrant up, you'll need to specify a base image in the Vagrantfile.
• vagrant init <boxpath> -- Initialize Vagrant with a specific box. To find a box, go to the public Vagrant box catalog. When you find one you like, just replace it's name with boxpath. For example, vagrant init ubuntu/trusty64.

Starting a VM

• vagrant up -- starts vagrant environment (also provisions only on the FIRST vagrant up)

sl0n

Latency Comparison Numbers
--------------------------
L1 cache reference                           0.5 ns
Branch mispredict                            5   ns
L2 cache reference                           7   ns                      14x L1 cache
Mutex lock/unlock                           25   ns
Main memory reference                      100   ns                      20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy             3,000   ns        3 us
Send 1K bytes over 1 Gbps network       10,000   ns       10 us
Read 4K randomly from SSD*             150,000   ns      150 us          ~1GB/sec SSD