[Switch] nginx dual-machine Hot Standby High Availability Solution

1. You can obtain the random VIP1 and VIP2 through DNS query.

2. VIP1 and VIP2 are hot standby, load balancing, and high availability.

When rip1 cannot be accessed, host 2 will detect that the eth0: ha2 added to VIP 1 is highly available at any time.

3. The shell script VIP and rip must correspond. nginx_loadbalance_vip1.sh runs on Host 1 and the command is

# Nohup./nginx_loadbalance_vip1.sh>/dev/null & background running

4. For the monitoring of two machines, you only need to monitor rip. You can also write a crontab for the monitoring script to prevent unexpected termination of the script.

Structure chart

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The script for HOST 1 is as follows:

Cat nginx_loadbalance_vip1.sh

1. #! /Bin/bash

2.  

3. Lang = C

4. Date = $ (date-d "today" + "% Y-% m-% d % H: % m: % s ")

5. Bind_vip1 = 192.168.16.238

6. Bind_vip2 = 192.168.16.239

7. Web_ip_rip1 = 192.168.16.240

8. Web_ip_rip2 = 192.168.16.241

9. Netmask = 255.255.255.0

10. Gateway = 192.168.16.1

11. Broadcast = 219.232.254.255

12. Function_bind_vip1 ()

13. {

14. /Sbin/ifconfig eth0: HA1 $ {bind_vip1} broadcast $ {broadcast} netmask $ {netmask} Up

15. /Sbin/route add-host $ {gateway} Dev eth0: HA1

16. }

17.  

18.  

19. Function_bind_vip2 ()

20. {

21. /Sbin/ifconfig eth0: ha2 $ {bind_vip2} broadcast $ {broadcast} netmask $ {netmask} Up

22. /Sbin/route add-host $ {gateway} Dev eth0: ha2

23. }

24.  

25. Function_restart_nginx ()

26. {

27. Kill-usr1 'cat/var/log/nginx. Pi'

28. }

29.  

30. Function_remove_vip1 ()

31. {

32. /Sbin/ifconfig eth0: HA1 $ {bind_vip1} broadcast $ {broadcast} netmask $ {netmask} Down

33. }

34.  

35. Function_remove_vip2 ()

36. {

37. /Sbin/ifconfig eth0: ha2 $ {bind_vip2} broadcast $ {broadcast} netmask $ {netmask} Down

38. }

39.  

40. Function_vip_arping1 ()

41. {

42. /Sbin/arping-I eth0-C 3-S ${bind_vip1 }1 {gateway}>/dev/null 2> & 1

43. }

44.  

45. Function_vip_arping2 ()

46. {

47. /Sbin/arping-I eth0-C 3-S ${bind_vip2 }$ {gateway}>/dev/null 2> & 1

48. }

49.  

50. Bind_time_vip1 = "N ";

51. Bind_time_vip2 = "N ";

52.  

53.  

54.  

55.  

56. While true

57. Do

58. Httpcode_rip1 = '/usr/bin/curl-O/dev/null-S-w % {http_code} http: // $ {web_ip_rip1}/status.htm'

59. Httpcode_rip2 = '/usr/bin/curl-O/dev/null-S-w % {http_code} http: // $ {web_ip_rip2}/status.htm'

60. # VIP1

61. If [x $ httpcode_rip1 = "x200"];

62. Then

63. If [$ bind_time_vip1 = "N"];

64. Then

65. Function_bind_vip1

66. Function_vip_arping1

67. Function_restart_nginx

68. Bind_time_vip1 = "Y"

69. Fi

70. Function_vip_arping1

71. Else

72. If [$ bind_time_vip1 = "Y"];

73. Then

75.  

76. Function_remove_vip1

77. Bind_time_vip1 = "N"

78. Fi

79. Fi

80.  

81. # VIP2

82. If [x $ httpcode_rip2 = "x200"];

83. Then

84. If [$ bind_time_vip2 = "Y"];

85. Then

86. Function_remove_vip2

87. Bind_time_vip2 = "N"

88. Fi

89. Else

90. If [$ bind_time_vip2 = "N"];

91. Then

92. Function_bind_vip2

93. Function_vip_arping2

94. Function_restart_nginx

95. Bind_time_vip2 = "Y"

96. Fi

97. Function_vip_arping2

98. Fi

99. Sleep 5

100. Done

[Switch] nginx dual-machine Hot Standby High Availability Solution