# 创建两个network namespace net1和net2
ip netns add net1
ip netns add net2

# 创建macvlan接口
# enp0s8相当于物理网卡eth0
ip link add link enp0s8 mac1 type macvlan

# 可以看到创建了接口mac1@enp0s8
[root@localhost vagrant]# ip link
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: enp0s3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP mode DEFAULT qlen 1000
    link/ether 08:00:27:6c:3e:95 brd ff:ff:ff:ff:ff:ff
3: enp0s8: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP mode DEFAULT qlen 1000
    link/ether 08:00:27:cf:b0:b4 brd ff:ff:ff:ff:ff:ff
4: docker_gwbridge: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN mode DEFAULT
    link/ether 02:42:8e:cf:a9:da brd ff:ff:ff:ff:ff:ff
5: br-b3e83aa45886: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN mode DEFAULT
    link/ether 02:42:bf:b4:e5:36 brd ff:ff:ff:ff:ff:ff
6: docker0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN mode DEFAULT
    link/ether 02:42:25:e7:40:32 brd ff:ff:ff:ff:ff:ff
19: br-ec6c4e77321d: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN mode DEFAULT
    link/ether 02:42:e0:d8:38:6d brd ff:ff:ff:ff:ff:ff
24: mac1@enp0s8: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN mode DEFAULT
    link/ether 3e:b8:e9:1d:3b:c8 brd ff:ff:ff:ff:ff:ff

# 将mac1放入到net1 namespace中
[root@localhost vagrant]# ip link set mac1 netns net1
[root@localhost vagrant]# ip netns exec net1 ip link
1: lo: <LOOPBACK> mtu 65536 qdisc noop state DOWN mode DEFAULT
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
24: mac1@if3: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN mode DEFAULT
    link/ether 3e:b8:e9:1d:3b:c8 brd ff:ff:ff:ff:ff:ff link-netnsid 0

# 在net1中将mac1接口命名为eth0
[root@localhost vagrant]# ip netns exec net1 ip link set mac1 name eth0
[root@localhost vagrant]# ip netns exec net1 ip link
1: lo: <LOOPBACK> mtu 65536 qdisc noop state DOWN mode DEFAULT
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
24: eth0@if3: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN mode DEFAULT
    link/ether 3e:b8:e9:1d:3b:c8 brd ff:ff:ff:ff:ff:ff link-netnsid 0

# 在net1中分配eth0网卡的ip地址为192.168.8.120
[root@localhost vagrant]# ip netns exec net1 ip addr add 192.168.8.120/24 dev eth0
[root@localhost vagrant]# ip netns exec net1 ip link set eth0 up
[root@localhost vagrant]# ip netns exec net1 ip link
1: lo: <LOOPBACK> mtu 65536 qdisc noop state DOWN mode DEFAULT
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
24: eth0@if3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN mode DEFAULT
    link/ether 3e:b8:e9:1d:3b:c8 brd ff:ff:ff:ff:ff:ff link-netnsid 0

[root@localhost vagrant]# docker network create -d macvlan --subnet=10.0.2.100/24 --gateway=10.0.2.2 -o parent=enp0s3 mcv
5c637798d559471bd8d1036cdd947d3949e1973f724568da066d9c60c00fb5e6

[root@localhost vagrant]# docker network ls
NETWORK ID          NAME                DRIVER              SCOPE
b6a128f1730e        bridge              bridge              local
a65957cd6c3f        docker_gwbridge     bridge              local
540bb390028a        host                host                local
b3e83aa45886        isolated_nw         bridge              local
ec6c4e77321d        local_alias         bridge              local
5c637798d559        mcv                 macvlan             local
3d247d0414d0        none                null                local

[root@localhost tmp]# mkdir /tmp/dir{1,2,3,4}
[root@localhost tmp]# pushd /tmp/dir1
/tmp/dir1 /tmp
[root@localhost dir1]# pushd /tmp/dir2
/tmp/dir2 /tmp/dir1 /tmp
[root@localhost dir2]# pushd /tmp/dir3
/tmp/dir3 /tmp/dir2 /tmp/dir1 /tmp
[root@localhost dir3]# pushd /tmp/dir4
/tmp/dir4 /tmp/dir3 /tmp/dir2 /tmp/dir1 /tmp
# dirs的显示内容跟pushd完成后的输出一致
[root@localhost dir4]# dirs
/tmp/dir4 /tmp/dir3 /tmp/dir2 /tmp/dir1 /tmp

[root@localhost dir4]# popd
/tmp/dir3 /tmp/dir2 /tmp/dir1 /tmp

# 带有数字比较容易出错
[root@localhost dir3]# popd +1
/tmp/dir3 /tmp/dir1 /tmp

# 清除目录栈
[root@localhost dir3]# dirs -c
[root@localhost dir3]# dirs
/tmp/dir3

[root@localhost runc]# docker pull ubuntu
Using default tag: latest
latest: Pulling from library/ubuntu
c64513b74145: Pull complete
01b8b12bad90: Pull complete
c5d85cf7a05f: Pull complete
b6b268720157: Pull complete
e12192999ff1: Pull complete
Digest: sha256:3f119dc0737f57f704ebecac8a6d8477b0f6ca1ca0332c7ee1395ed2c6a82be7
Status: Downloaded newer image for ubuntu:latest

[root@localhost overlay2]# tree -L 2
.
|-- 664ae13f1c21402385076025d68476eb8d1cc4be6c6a218b24bd55217ac62672    // 第0层
|   |-- diff
|   `-- link    // MZUEUOFHBNVTRCJYJEG7QY4VWT
|-- 783ad02709b67ac47b55198e9659c4592f0972334987ab97f42fd10f1784cbba    // 第2层
|   |-- diff
|   |-- link    // HXATFASQ4E2JBG434DUEN54EZZ
|   |-- lower   // l/WUZC5WSTQTPJUJ4KFAYCUT5IPD:l/MZUEUOFHBNVTRCJYJEG7QY4VWT
|   |-- merged
|   `-- work
|-- 89f7a20dda3d868840e20d9e8f1bfe20c5cca51c27b07825f100da0f474672f6    // 第3层
|   |-- diff
|   |-- link    // 5PHT7S3MCZTTQOXVPA4CKJRRFD
|   |-- lower   // l/HXATFASQ4E2JBG434DUEN54EZZ:l/WUZC5WSTQTPJUJ4KFAYCUT5IPD:l/MZUEUOFHBNVTRCJYJEG7QY4VWT
|   |-- merged
|   `-- work
|-- backingFsBlockDev
|-- bad073a2d1f79a03af6caa0b3f51a22e6762cebbc0c30e45458fe6c1ff266f68    // 第4层
|   |-- diff
|   |-- link    // QMKHIPSDT4JTPE4FLT7QGJ33ND
|   |-- lower   // l/5PHT7S3MCZTTQOXVPA4CKJRRFD:l/HXATFASQ4E2JBG434DUEN54EZZ:l/WUZC5WSTQTPJUJ4KFAYCUT5IPD:l/MZUEUOFHBNVTRCJYJEG7QY4VWT
|   |-- merged
|   `-- work
|-- cb40b5b47c699050305676b35b1cea1ce08b38604dd68243c4be48934125b1a3    // 第1层
|   |-- diff
|   |-- link    // WUZC5WSTQTPJUJ4KFAYCUT5IPD
|   |-- lower   // l/MZUEUOFHBNVTRCJYJEG7QY4VWT
|   |-- merged
|   `-- work
`-- l
    |-- 5PHT7S3MCZTTQOXVPA4CKJRRFD -> ../89f7a20dda3d868840e20d9e8f1bfe20c5cca51c27b07825f100da0f474672f6/diff
    |-- HXATFASQ4E2JBG434DUEN54EZZ -> ../783ad02709b67ac47b55198e9659c4592f0972334987ab97f42fd10f1784cbba/diff
    |-- MZUEUOFHBNVTRCJYJEG7QY4VWT -> ../664ae13f1c21402385076025d68476eb8d1cc4be6c6a218b24bd55217ac62672/diff
    |-- QMKHIPSDT4JTPE4FLT7QGJ33ND -> ../bad073a2d1f79a03af6caa0b3f51a22e6762cebbc0c30e45458fe6c1ff266f68/diff
    `-- WUZC5WSTQTPJUJ4KFAYCUT5IPD -> ../cb40b5b47c699050305676b35b1cea1ce08b38604dd68243c4be48934125b1a3/diff

[root@localhost overlay2]# tree -L 1 0326c1da0af912a6ea5efda77b65b04e796993e0f111ed8f262c55b2716f1c08-init 0326c1da0af912a6ea5efda77b65b04e796993e0f111ed8f262c55b2716f1c08 l
0326c1da0af912a6ea5efda77b65b04e796993e0f111ed8f262c55b2716f1c08-init
|-- diff
|-- link    // ZJVMGTB2IOJ6QF57TYM5O7EWXW
|-- lower   // l/QMKHIPSDT4JTPE4FLT7QGJ33ND:l/5PHT7S3MCZTTQOXVPA4CKJRRFD:l/HXATFASQ4E2JBG434DUEN54EZZ:l/WUZC5WSTQTPJUJ4KFAYCUT5IPD:l/MZUEUOFHBNVTRCJYJEG7QY4VWT
|-- merged
`-- work
0326c1da0af912a6ea5efda77b65b04e796993e0f111ed8f262c55b2716f1c08
|-- diff
|-- link
|-- lower   // l/ZJVMGTB2IOJ6QF57TYM5O7EWXW:l/QMKHIPSDT4JTPE4FLT7QGJ33ND:l/5PHT7S3MCZTTQOXVPA4CKJRRFD:l/HXATFASQ4E2JBG434DUEN54EZZ:l/WUZC5WSTQTPJUJ4KFAYCUT5IPD:l/MZUEUOFHBNVTRCJYJEG7QY4VWT
|-- merged
`-- work
l
|-- 5PHT7S3MCZTTQOXVPA4CKJRRFD -> ../89f7a20dda3d868840e20d9e8f1bfe20c5cca51c27b07825f100da0f474672f6/diff
|-- AOLYGFOHIAHWU5CBAJFULNAXI7 -> ../0326c1da0af912a6ea5efda77b65b04e796993e0f111ed8f262c55b2716f1c08/diff
|-- HXATFASQ4E2JBG434DUEN54EZZ -> ../783ad02709b67ac47b55198e9659c4592f0972334987ab97f42fd10f1784cbba/diff
|-- MZUEUOFHBNVTRCJYJEG7QY4VWT -> ../664ae13f1c21402385076025d68476eb8d1cc4be6c6a218b24bd55217ac62672/diff
|-- QMKHIPSDT4JTPE4FLT7QGJ33ND -> ../bad073a2d1f79a03af6caa0b3f51a22e6762cebbc0c30e45458fe6c1ff266f68/diff
|-- WUZC5WSTQTPJUJ4KFAYCUT5IPD -> ../cb40b5b47c699050305676b35b1cea1ce08b38604dd68243c4be48934125b1a3/diff
`-- ZJVMGTB2IOJ6QF57TYM5O7EWXW -> ../0326c1da0af912a6ea5efda77b65b04e796993e0f111ed8f262c55b2716f1c08-init/diff

[root@localhost overlay2]# tree 0326c1da0af912a6ea5efda77b65b04e796993e0f111ed8f262c55b2716f1c08-init
0326c1da0af912a6ea5efda77b65b04e796993e0f111ed8f262c55b2716f1c08-init
|-- diff
|   |-- dev
|   |   `-- console
|   `-- etc
|       |-- hostname
|       |-- hosts
|       |-- mtab -> /proc/mounts
|       `-- resolv.conf
|-- link
|-- lower
|-- merged
`-- work
    `-- work

[root@localhost overlay2]# tree -L 2  0326c1da0af912a6ea5efda77b65b04e796993e0f111ed8f262c55b2716f1c08
0326c1da0af912a6ea5efda77b65b04e796993e0f111ed8f262c55b2716f1c08
|-- diff
|-- link
|-- lower
|-- merged
|   |-- bin
|   |-- boot
|   |-- dev
|   |-- etc
|   |-- home
|   |-- lib
|   |-- lib64
|   |-- media
|   |-- mnt
|   |-- opt
|   |-- proc
|   |-- root
|   |-- run
|   |-- sbin
|   |-- srv
|   |-- sys
|   |-- tmp
|   |-- usr
|   `-- var
`-- work
    `-- work

[root@localhost overlay2]# mount  | grep overlay2
/dev/mapper/centos-root on /var/lib/docker/overlay2 type xfs (rw,relatime,attr2,inode64,noquota)
overlay on /var/lib/docker/overlay2/0326c1da0af912a6ea5efda77b65b04e796993e0f111ed8f262c55b2716f1c08/merged type overlay (rw,relatime,lowerdir=/var/lib/docker/overlay2/l/ZJVMGTB2IOJ6QF57TYM5O7EWXW:/var/lib/docker/overlay2/l/QMKHIPSDT4JTPE4FLT7QGJ33ND:/var/lib/docker/overlay2/l/5PHT7S3MCZTTQOXVPA4CKJRRFD:/var/lib/docker/overlay2/l/HXATFASQ4E2JBG434DUEN54EZZ:/var/lib/docker/overlay2/l/WUZC5WSTQTPJUJ4KFAYCUT5IPD:/var/lib/docker/overlay2/l/MZUEUOFHBNVTRCJYJEG7QY4VWT,upperdir=/var/lib/docker/overlay2/0326c1da0af912a6ea5efda77b65b04e796993e0f111ed8f262c55b2716f1c08/diff,workdir=/var/lib/docker/overlay2/0326c1da0af912a6ea5efda77b65b04e796993e0f111ed8f262c55b2716f1c08/work)

type foo struct {
 name string
 value string
}

func mutate(s []foo, name string) {
// TODO
}

struct    Slice
{    // must not move anything
    byte*    array;        // actual data
    uintgo    len;        // number of elements
    uintgo    cap;        // allocated number of elements
};

// range方式
for i, _ := range s {
	s[i].name = name
}

// for i形式
for i:=0; i<len(s); i++ {
  s[i].name = name
}

func find(s []foo, name string) []*foo {
// TODO

}

func find(s []foo, name string) []*foo {
	res := []*foo{}

	for i := 0; i < len(s); i++ {
		if s[i].name == name {
			res = append(res, &(s[i]))
			break
		}
	}
	return res
}

package main

import "fmt"

func m(s []int) {
	s[0] = -1
	s = append(s, 4)
}

func main() {
	s1 := []int{1, 2, 3}
	m(s1)
	s2 := make([]int, 3, 6)
	m(s2)
	s2 = append(s2, 7)
	s3 := [3]int{1, 2, 3}
	fmt.Println(s1)
	fmt.Println(s2)
	fmt.Println(s3)
}

[-1 2 3]
[-1 0 0 7]
[1 2 3]

func f() {
	s1 := make([]int, 2, 8)
	fmt.Println(s1)
	s2 := append(s1, 4)
	fmt.Println(s2)
	s3 := append(s1, 5)
	fmt.Println(s3)
	fmt.Println(s2)
}

[0 0 4]
[0 0 5]
[0 0 5]

package main

import (
	"fmt"
	"runtime"
)

func main() {
	runtime.GOMAXPROCS(1)
	go func() {
		fmt.Println(1)
	}()
	for {
	}
	fmt.Println(1)
}

showA
showB

func main() {
	runtime.GOMAXPROCS(1)
	int_chan := make(chan int, 1)
	string_chan := make(chan string, 1)
	int_chan <- 1
	string_chan <- "hello"
	select {
	case value := <-int_chan:
		fmt.Println(value)
	case value := <-string_chan:
		panic(value)
	}
}

package main

import (
	"fmt"
)

type People interface {
	Speak(string) string
}

type Student struct{}

func (stu *Student) Speak(think string) (talk string) {
	if think == "bitch" {
		talk = "You are a good boy"
	} else {
		talk = "hi"
	}
	return
}

func main() {
	var peo People = Student{}
	think := "bitch"
	fmt.Println(peo.Speak(think))
}

package main

import (
  "fmt"
  "time"
  "runtime"
)

func main() {
  runtime.GOMAXPROCS(1)
  arr := [10000]int{}
  for i:=0; i<len(arr); i++ {
    arr[i] = i
  }
  for _, a := range arr {
    go func() {
      fmt.Println(a)
    }()
  }
  for {
    time.Sleep(time.Second)
  }
}

package main

import (
	"fmt"
)

type People interface {
	Show()
}

type Student struct{}

func (stu *Student) Show() {

}

func live() People {
	var stu *Student
	return stu
}

func main() {
	if live() == nil {
		fmt.Println("AAAAAAA")
	} else {
		fmt.Println("BBBBBBB")
	}
}

func main() {
    // range遍历为rune类型，输出int32
    for _, w:=range "123" {
        fmt.Printf("%T", w)
    }
    // 取数组为byte类型，输出uint8
    fmt.Printf("%T", "123"[0])
}

func funcMui(x,y int)(sum int,error){
    return x+y,nil
}

package main

func main() {
	println(DeferFunc1(1))
	println(DeferFunc2(1))
	println(DeferFunc3(1))
	println(DeferFunc4(1))
}

func DeferFunc1(i int) (t int) {
	t = i
	defer func() {
		t += 3
	}()
	return t
}

func DeferFunc2(i int) int {
	t := i
	defer func() {
		t += 3
	}()
	return t
}

func DeferFunc3(i int) (t int) {
	defer func() {
		t += i
	}()
	return 2
}

func DeferFunc4(i int) (t int) {
	t = 10
	return 2
}

package main

import (
	"fmt"
)

func main() {
	sn1 := struct {
		age  int
		name string
	}{age: 11, name: "qq"}

	sn2 := struct {
		age  int
		name string
	}{age: 11, name: "qq"}

	sn3 := struct {
		name string
		age  int
	}{age: 11, name: "qq"}

	if sn1 == sn2 {
		fmt.Println("sn1 == sn2")
	}

	if sn1 == sn3 {
		fmt.Println("sn1 == sn3")
	}


	sm1 := struct {
		age int
		m   map[string]string
	}{age: 11, m: map[string]string{"a": "1"}}

	sm2 := struct {
		age int
		m   map[string]string
	}{age: 11, m: map[string]string{"a": "1"}}

	if sm1 == sm2 {
		fmt.Println("sm1 == sm2")
	}
}

package main

import (
	"fmt"
)

func Foo(x interface{}) {
	if x == nil {
		fmt.Println("empty interface")
		return
	}
	fmt.Println("non-empty interface")
}

func main() {
	var x *int = nil
	Foo(x)
}

package main

import (
	"fmt"
	"sync"
)

func main() {
	wg := sync.WaitGroup{}
	for _, i:=range []int{1, 2, 3, 4, 5} {
		wg.Add(1)
		go func() {
			defer wg.Done()
			fmt.Println(i)
		} ()
	}
	wg.Wait()
}

package main

import (
	"fmt"
)

type People interface {
	Speak(string) string
}

type Stduent struct{}

func (stu *Stduent) Speak(think string) (talk string) {
	if think == "bitch" {
		talk = "You are a good boy"
	} else {
		talk = "hi"
	}
	return
}

func main() {
	var peo People = Stduent{}
	think := "bitch"
	fmt.Println(peo.Speak(think))
}

package main

const cl = 100

var bl = 123

func main() {
	println(&bl, bl)
	println(&cl, cl)
}

import "sync"

func f(m sync.Mutex) {
   m.Lock()
   defer m.Unlock()

   // Do something...
}

func    main()  {
    case1()
    case2()
}

func    case1() {
   s1   :=  make([]string,  1,  20)
   s1[0]    =   "hello"
   p1   :=  &s1[0]
   s1   =   append(s1,  "world")
   *p1  =   "hello2"
   fmt.Printf("value    of  p1  is  %s, value   of  s1[0]   is  %s  \n",    *p1,    s1[0])
}

func    case2() {
   s1   :=  make([]string)
   s1[0]    =   "hello"
   p1   :=  &s1[0]
   s1   =   append(s1,  "world")
   *p1  =   "hello2"
   fmt.Printf("value    of  p1  is  %s, value   of  s1[0]   is  %s  \n",    *p1,    s1[0])
}

git checkout master

# 由于修改了_config.yml文件，存在冲突，合并失败
lvkai@osx:~/blog/kuring/themes/hexo-theme-next% git merge upstream/master                                                                                                128 ↵
Removing source/css/_common/components/third-party/gentie.styl
Removing layout/_third-party/comments/gentie.swig
Auto-merging _config.yml
CONFLICT (content): Merge conflict in _config.yml
Removing README.en.md
Automatic merge failed; fix conflicts and then commit the result.

# Gitment
# Introduction: https://imsun.net/posts/gitment-introduction/
gitment:
  enable: true
  mint: true # RECOMMEND, A mint on Gitment, to support count, language and proxy_gateway
  count: true # Show comments count in post meta area
  lazy: false # Comments lazy loading with a button
  cleanly: false # Hide 'Powered by ...' on footer, and more
  language: # Force language, or auto switch by theme
  github_user: kuring # MUST HAVE, Your Github ID
  github_repo: gitment-comments # MUST HAVE, The repo you use to store Gitment comments
  client_id: xxx # MUST HAVE, Github client id for the Gitment
  client_secret: xxxx # EITHER this or proxy_gateway, Github access secret token for the Gitment
  proxy_gateway: # Address of api proxy, See: https://github.com/aimingoo/intersect
  redirect_protocol: # Protocol of redirect_uri with force_redirect_protocol when mint enabled