xg emctoo

Virtual Networking on Linux

In the Linux Kernel, support for networking hardware and the methods to interact with these devices is standardized by the socket API:

                +----------------+
                |   Socket API   |
                +-------+--------+
                        |
User space              |

My useful utilities and favourite programs to make everyday life that bit easier

Most of these are Windows based, but some are cross-platform. They are mainly free tools, but paid ones have been marked accordingly. Freemium tools have a free version but have a full version for a price. Tools are in no particular order

Utilities

Windows Sysinternals - the swiss-army knife of Windows tools: https://docs.microsoft.com/en-us/sysinternals/ (Free)
Listary Pro - a spotlight style search tool for Windows: http://www.listary.com/pro (Freemium)
Ditto - clipboard management tool: http://ditto-cp.sourceforge.net/ (Free)
Cmder/ComEmu - make command prompt suck less: http://cmder.net/ (Free)
Bvckup 2 - the best backup program I've tried: https://bvckup2.com/ (Paid)

If you want a run-down of the 1.3 changes and the design decisions behidn those changes, check out the LonestarElixir Phoenix 1.3 keynote: https://www.youtube.com/watch?v=tMO28ar0lW8

To use the new phx.new project generator, you can install the archive with the following command:

$ mix archive.install https://github.com/phoenixframework/archives/raw/master/phx_new.ez

Bump your phoenix dep

Phoenix v1.3.0 is a backwards compatible release with v1.2.x. To upgrade your existing 1.2.x project, simply bump your phoenix dependency in mix.exs:

###产生1024位RSA私匙，用3DES加密它，口令为trousers，输出到文件rsaprivatekey.pem

openssl genrsa -out rsaprivatekey.pem -passout pass:trousers -des3 1024

###从文件rsaprivatekey.pem生成的公钥匙输出到文件rsapublickey.pem

openssl rsa -in rsaprivatekey.pem -passin pass:trousers -pubout -out rsapubckey.pem

This document has moved!

It's now here, in The Programmer's Compendium. The content is the same as before, but being part of the compendium means that it's actively maintained.

Processing JSON using jq

jq is useful to slice, filter, map and transform structured json data.

Installing jq

On Mac OS

brew install jq

	# Module for configuring libvirt with static NixOS networking
	# instead of using libvirt managed bridge.

	{ config, lib, pkgs, ... }:
	with lib;

	let
	cfg = config.virtualisation.libvirtd.networking;
	v6Enabled = cfg.ipv6.network != null;
	v6PLen = toInt (elemAt (splitString "/" cfg.ipv6.network) 1);

	{ pkgs, lib, ... }:

	with lib;
	with builtins;

	let
	isRustFile = path: type:
	hasSuffix ".rs" path && type == "regular" && path != "mod.rs";
	mergeAllAttrSets = attrsSets:
	foldl' (recursiveUpdate) {} attrsSets;

	# Install these packages (use your favorite AUR tool here)
	yay -S minikube kubectl docker-machine-driver-kvm2 libvirt qemu-headless ebtables

	# Get libvirt going
	sudo systemctl enable libvirtd.service
	sudo usermod -a -G libvirt $(whoami)

	# This fix thanks to http://blog.programmableproduction.com/2018/03/08/Archlinux-Setup-Minikube-using-KVM/
	sudo virsh net-autostart default

	#!/bin/bash
	#
	# convert a mysql database to sqlite3
	#
	#see https://stackoverflow.com/questions/5164033/
	# export-a-mysql-database-to-sqlite-database

	mysql_host=localhost
	mysql_user=george
	#mysql_passwd=****************