This document discusses various aspects of setting up servers and infrastructure for a device management system. It addresses: 1) Using high availability configurations with DRBD and heartbeat for redundancy across two servers with a virtual IP for failover. 2) Setting up a read-only MySQL replica for additional servers to improve scalability and performance. 3) Considerations for connecting multiple access points, subnets, and remote locations to the internal network infrastructure.

1. tom@ifp.io

4. ( DevOps T.T)

5. 20 !

6. http://www.inside.com.tw/2013/12/20/59-hilarious-but-true-programming-quotes-for-software-developers
orz

8. • Server
•
• ID
•
•

9. Server

10. : ,
: Server
, ,
ISP
- / ( ) / ...

11. : Server
: HA (High Availability)
DRBD + Heartbeat Active-Passive HA
10.0.0.101 10.0.0.102
IP (VIP)
10.0.0.100
IP
,
(transparent)
* 101/102 IP
DRBD
MySQL (samba)

12. ...

13. : wifi or 4G
: , Server/
MySQL Read-only Replica
server
server
server,
,

14. server
DRBD + heartbeat
server
Read-only replica
DB
Internet
LAN
ID

15. (Read/Write)
?
: Primary (Active) Write, Secondary (Passive)
Read

16. ID
Django Server
(HTTP API Server)
• ( / JPG)
•
• ( / )
• / /
•
• (Session)
•Insnergy
•Infographics

17. • Session, ,
• ( / RFID ) Session
• Session
• RFID
• ,

18. server
Read-only replica
DB
redis slave
server
DRBD + heartbeat
django
django-rest-framework
django
django-rest-framework
django-allauth (social)
only ( )django
django-rest-framework
(read-only)

19. • Server
•
• ID
•
•

21. ,

22. AP, 200+
, 10

23. AP Switch

24. Router!!!

25. 10.0.0.X
10.0.1.X
A/B ( / )
10.0.3.X
C ( )
10.0.4.X
D ( )
10.0.5.X
E ( )
10.0.6.X
F ( )
10.0.7.X
G ( )
Lab Internal
&
+
1 ( ) 2 ( )
x15

29. (A-G)
X (EX2)

30. IP

31. ABCDEFG
X
EX2 ( )
10.0.X.Y
X A-G , 1-7
Y , 101
EX2 IP 10.0.5.102

32. ?

33. orz

34. DEMO!

35. • Server
•
• ID
•
•

36. ID

37. : Plug & Play & Portable
1. ( / ) 2. 3.
IP ( DHCP),

38. QR code

39. Bad Practice: Server IP & Port
zeroconf / avahi , subnet
zeroconf / avahi, ID ,

40. , ID
QR Code ,
ID

41. QR Code /

42. :
bug feature request ...
:Auto Update
ID

43. (HTTP API call)
git fetch
git checkout version_tag

44. redis

45. ID redis
1.
2.
3.

46. ID
C2 C
magic packet

47. IP
, heartbeat server

49. Django (Web Server)

50. IntegrationTest
redis ID

51. ID•
•
• RFID
• QR Code
• Session
•
•
• Auto Update
• /
• Heartbeat
•
•
• (redis / QR)
• (QR)
• (redis)

52. • Server
•
• ID
•
•

54. ?

55. Server
1. OS: + x2 (ubuntu server)
2. HA: DRBD + heartbeat, zfs
3. DB: MySQL (replica)
4. MQ: redis
5. DNS: Domain
6. Web Server: nginx / Let’s Encrypt / Security Check
7. Web App: Python Environment / git / python code
8. samba ( )
9.
https://www.ssllabs.com/ssltest/

56. ProductionStagingDev
Development
http://www.webopedia.com/TERM/S/staging_server.html

57. server
1. dev code, git
2. server git code
3. transpile (webpack) Babel, JSX, minify etc.
4. Django collect static
5. reload nginx

58. ID : Auto Update

59. ,
Prototype Auto Update
Auto Update bug GG!!!

60. ID
1. dev code, git
2. server ID machine version
3. ID

61. Auto Update Auto Update?

63. : Copy & Paste orz..

64. BT Sync (Now Resilio)

65. Server (HTTP API)

66. • Server
•
• ID
•
•

69. ? XD

72. HTTPS

73. SSL HTTPS

74. : Wifi
WEP
Wifi, (like: HTTPS)

75. QR code ?
hash checksum
command.reboot.d87a

76. QR Code?

77. 10.0.0.X
10.0.1.X
A ( )
10.0.3.X
C ( )
10.0.4.X
D ( )
10.0.5.X
E ( )
10.0.6.X
F ( )
10.0.7.X
G ( )
Lab Internal
&
+
1 ( ) 2 ( )
x15

78. + : XSS / SQL Injection etc.
https://docs.djangoproject.com/ja/1.9/topics/security/
,

79. Trade-off

80. Server
: , ,
: Server GG? Bottle neck Server

81. Server
: , loosely coupled
: Bottle neck Server , Server

82. Subnet
: ,
: , zeroconf / avahi

83. MySQL Replica HTTP API Call
: , MySQL ,
: Django ,

84. ID unicast
: , , Debug
:

85. Database ( ) code?
DB : , , :
: source control , : ,

86. UDP TCP?
UDP : , , : ,
TCP : , , : ,

87. 90% , ,
90%

88. (good practices)

89. , code
... ...

90. source control
...

91. coding…
50 ...
...

92. 512 527
90% 501 511 525?

95. / Google / Facebook / KKBox / m01
( )

97. Chrome ? Blizzard Agent ?
MOD ? KKBox ?

98. Thank you
Any questions?

100. Scale

103. C10K problem
http://www.kegel.com/c10k.html

104. ( )
: — ( ) ( ) — ( ) ( ) — ( ) ( ) —
( )
Jack ( ) , , !
http://www.mobile01.com/topicdetail.php?f=507&t=1955864

105. Server ?

106. moment ?
or ?

107. HTTP API Server
request ?
request?
300 , Server ?

108. Example: PyCon 2015 Bingo!
, Check

109. 300 & Check
: , 15
Cache

111. CPU I/O?
?
scale?

112. Example: 101
25ms or 200ms
( HTTP request
header overhead)

113. PerformanceTuning

114. Sphinx