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# set up on host1 192.168.33.11, 08:00:27:f8:73:79
ip link add vxlan0 type vxlan id 42 group 239.1.1.1 dev eth1 dstport 4789
ip link set vxlan0 address 54:8:20:0:0:1
ip address add 10.0.0.1/8 dev vxlan0
ip link set up vxlan0

# set up on host2 192.168.33.12, 08:00:27:d9:18:aa
ip link add vxlan0 type vxlan id 42 group 239.1.1.1 dev eth1 dstport 4789
ip link set vxlan0 address 54:8:20:0:0:2
ip address add 10.0.0.2/8 dev vxlan0

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/msg nickserv register [password] [email]
/msg nickserv identify [password]

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cmake_minimum_required(VERSION 3.8)
project(linux C)

include_directories(include)

file(GLOB_RECURSE ALL_FILES
        "*.h"
        "*.c"
        )

chenchun

http://vladimir-ivanov.net/how-to-compact-virtualboxs-vdmk-file-size/

1. Fill the free space with zeros VirtualBox only knows that the space is really free if it’s been set to zero, and standard deletion won’t do this. Login into the virtual machine and run the following command:

cat /dev/zero > zero.fill; sync; sleep 1; sync; rm -f zero.fill

2. compact vmdk

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https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/networking_guide/sec-vlan_on_bond_and_bridge_using_ip_commands

To use VLANs over bonds and bridges, proceed as follows:

1. Add a bond device as root:

ip link add bond0 type bond
ip link set bond0 type bond miimon 100 mode active-backup
ip link set em1 down

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https://github.com/golang/go/wiki/cgo

# foo.go:

package gocallback

import "fmt"

/*

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package main

import (
	"net"
	"runtime"
	"fmt"

	"github.com/vishvananda/netns"
	"os"
)

chenchun

Latency numbers every programmer should know

L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns
L2 cache reference ........................... 7 ns
Mutex lock/unlock ........................... 25 ns
Main memory reference ...................... 100 ns             
Compress 1K bytes with Zippy ............. 3,000 ns  =   3 µs
Send 2K bytes over 1 Gbps network ....... 20,000 ns  =  20 µs
SSD random read ........................ 150,000 ns  = 150 µs

Read 1 MB sequentially from memory ..... 250,000 ns = 250 µs

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#!/usr/bin/env bash

function setup_overlay() {
    ip netns add overlay
    ip netns exec overlay ip li ad dev br0 type bridge
    ip li add dev vxlan42 type vxlan id 42 l2miss l3miss proxy learning dstport 4789
    ip link set vxlan42 netns overlay
    ip netns exec overlay ip li set dev vxlan42 name vxlan1
    ip netns exec overlay ip li set dev vxlan1 master br0
    ip li add dev vetha1 mtu 1450 type veth peer name vetha2 mtu 1450