1
00:00:07,200 --> 00:00:10,740
- Another awesome backup utility is rsync.

2
00:00:10,740 --> 00:00:13,080
What is so awesome about rsync?

3
00:00:13,080 --> 00:00:14,910
You can use it to synchronize files

4
00:00:14,910 --> 00:00:16,473
between different directories.

5
00:00:17,370 --> 00:00:19,230
You can also use it locally,

6
00:00:19,230 --> 00:00:21,660
uh but really the power is uh

7
00:00:21,660 --> 00:00:25,230
in synchronizing between remote systems.

8
00:00:25,230 --> 00:00:27,150
The only requirement is that remote,

9
00:00:27,150 --> 00:00:29,430
if needs to have sshd running.

10
00:00:29,430 --> 00:00:31,980
Rsync is using the sshd connection.

11
00:00:31,980 --> 00:00:34,530
It's a great utility to
ensure that the contents

12
00:00:34,530 --> 00:00:36,690
of a directory, is
synchronized with the contents

13
00:00:36,690 --> 00:00:38,280
of a remote directory.

14
00:00:38,280 --> 00:00:40,560
Let me show you how to use it.

15
00:00:40,560 --> 00:00:43,230
Before I begin this
demo, uh you must realize

16
00:00:43,230 --> 00:00:45,303
that this demo requires two computers.

17
00:00:50,040 --> 00:00:52,710
Alright, so let's start this demo.

18
00:00:52,710 --> 00:00:55,050
I'm using mkdir files

19
00:00:55,050 --> 00:00:56,380
and then touch

20
00:00:57,270 --> 00:00:59,220
files/file.

21
00:00:59,220 --> 00:01:01,005
1 up to

22
00:01:01,005 --> 00:01:02,940
100.

23
00:01:02,940 --> 00:01:04,320
Curly brackets.

24
00:01:04,320 --> 00:01:05,970
Yeah,

25
00:01:05,970 --> 00:01:08,740
and then I can use rsync

26
00:01:11,160 --> 00:01:13,380
minus azP.

27
00:01:13,380 --> 00:01:16,380
A is for archive mode,
z is through zip it,

28
00:01:16,380 --> 00:01:18,270
and p is for progress.

29
00:01:18,270 --> 00:01:21,450
To show you progress and that's convenient

30
00:01:21,450 --> 00:01:24,600
And I'm going to do that
for files to student

31
00:01:24,600 --> 00:01:29,600
at 192, 168, 29, 169

32
00:01:29,880 --> 00:01:34,120
That's the other server,
slash home, slash student

33
00:01:35,580 --> 00:01:37,023
slash files.

34
00:01:38,846 --> 00:01:40,929
(typing)

35
00:01:42,390 --> 00:01:43,425
And there we go.

36
00:01:43,425 --> 00:01:46,290
As you can see, a lot of
stuff has been synchronized.

37
00:01:46,290 --> 00:01:47,890
Let's check on the other server,

38
00:01:49,726 --> 00:01:50,559
where you can see

39
00:01:50,559 --> 00:01:53,100
that the directory files has been created.

40
00:01:53,100 --> 00:01:56,160
And in the directory files,
we have all these files.

41
00:01:56,160 --> 00:01:57,160
That's looking cool.

42
00:02:00,120 --> 00:02:03,120
Now, I'm going to create
a couple more files.

43
00:02:03,120 --> 00:02:05,313
So touch on files.

44
00:02:06,270 --> 00:02:09,630
File 101

45
00:02:09,630 --> 00:02:11,433
up to 110.

46
00:02:15,000 --> 00:02:16,440
And let's do something funny.

47
00:02:16,440 --> 00:02:19,500
I'm also going to remove files,

48
00:02:19,500 --> 00:02:21,003
file 50.

49
00:02:22,920 --> 00:02:24,090
And now what is happening,

50
00:02:24,090 --> 00:02:26,793
if you run the same rsync command again.

51
00:02:29,552 --> 00:02:30,660
(typing)

52
00:02:30,660 --> 00:02:34,590
As you can see, it is uh
synchronizing file 101

53
00:02:34,590 --> 00:02:37,920
up to 110, but you don't see the removal.

54
00:02:37,920 --> 00:02:38,790
And that is because,

55
00:02:38,790 --> 00:02:41,192
rsync by default, is not removing anything

56
00:02:41,192 --> 00:02:44,040
unless you specifically tell it to.

57
00:02:44,040 --> 00:02:45,000
You know uh,

58
00:02:45,000 --> 00:02:48,000
removing things automatically may lead

59
00:02:48,000 --> 00:02:50,790
to disaster, so you need to specify the

60
00:02:50,790 --> 00:02:52,740
'minus minus delete' option,

61
00:02:52,740 --> 00:02:54,363
if you want to delete as well.

62
00:02:55,860 --> 00:02:58,740
And there we can see, deleting file 50.

63
00:02:58,740 --> 00:03:00,963
This is basically, our rsync is working.

64
00:03:02,280 --> 00:03:05,193
Pretty simple, pretty
straight, pretty efficient.