分享一个VPS系统监控资源的脚本

以下是本人自己民写的一个Shell脚本,可以监控使用的VPS的CPU、Load、Memory、网络传输、网站能否打开等情况,感觉挺有用的,现在分享出来给需要的朋友.

几个月前开始使用VPS,每月限制300GB流量,流量方便基本够用了,但是有时候由于受到一些恶意访问,导致CPU、Memory等资源消耗较大,导致VPS上的博客网站响应时间太慢甚至有时根本无法打开网页,所以,我简单做了个脚本来进行监控和发邮件报警.

由于不是做很专业的运维,暂时不想上很专业的监控工具,如:Nagios、Puppet、Cacti、Zabbix等,所以自己手动了个Shell脚本来监控我关心的CPU、Load、Memory、网络传输、博客网站能否打开等内容,将该监控脚本分享如下:

https://github.com/smilejay/shell/blob/master/sh2013/vps_monitor.sh,代码如下:

1. #!/bin/bash
2. #set-x
3. #thescripttomonitormyVPS
4. #Itwillalertwhenmemory,load,CPU%,networking,httpd/mysqldorhome-page
5. #isinanabnormalstate.
6. #author:Jay
7. #date:2013-10-16
9. EMAIL="smile665@gmail.com"
10. WARN_MSG=""
12. #alertwhenfreememoryislessthan50MB
13. functionmem_free()
14. {
15. threshold=50#50MBfreememory
16. free_mem=$(free-m|grep"buffers/cache"|awk'{print$4}')
17. if[$free_mem-lt$threshold];then
18. WARN_MSG=$WARN_MSG"Freememeoryislessthan$thresholdMB.n"
19. return1
20. fi
21. return0
22. }
24. #alertwhenload(5min)islargerthan4
25. functionload_avg()
26. {
27. threshold=4#loadis4
28. load_5min=$(cat/proc/loadavg|awk'{print$2}')
29. if[$(echo"$load_5min>$threshold"|bc)-eq1];then
30. WARN_MSG=$WARN_MSG"5minaverageloadislargerthan$threshold.n"
31. return1
32. fi
33. return0
34. }
36. #alertwhenCPUidle%islessthan20%
37. functioncpu_idle()
38. {
39. threshold=20#CPUidle%20%
40. cpu_idle=$(sar15|grep-i'Average'|awk'{print$NF}')
41. if[$(echo"$cpu_idle<$threshold"|bc)-eq1];then
42. #inprintfcmd,%%representsasingle%
43. WARN_MSG=$WARN_MSG"CPUidle%%islessthan$threshold%%.n"
44. return1
45. fi
46. return0
47. }
49. #alertwhennetworkingtxspeedislargerthan80kB/s
50. functionnetwork_tx()
51. {
52. threshold=80#TXspeed80kB/s
53. interface=eth0
54. tx_speed=$(sar-nDEV105|grep"Average"|grep"$interface"|awk'{print$6}')
55. if[$(echo"$tx_speed>$threshold"|bc)-eq1];then
56. WARN_MSG=$WARN_MSG"networkingTXspeedislargerthan$thresholdkB/s.n"
57. return1
58. fi
59. return0
60. }
62. #alertwhenhttpdormysqldprocessdoesn'texist
63. functionhttpd_mysqld()
64. {
65. ps-ef|grep'httpd'|grep-v'grep'
66. if[$?-ne0];then
67. WARN_MSG=$WARN_MSG"httpdprocessdoesn'texist.n"
68. return1
69. else
70. ps-ef|grep'mysqld'|grep-v'grep'
71. if[$?-ne0];then
72. WARN_MSG=$WARN_MSG"mysqldprocessdoesn'texist.n"
73. return1
74. fi
75. fi
76. return0
77. }
79. #alertwhen'Stayhungry'doesn'texistinthehomepagehttp://smilejay.com/
80. functionhome_page()
81. {
82. url=http://smilejay.com/
83. keywords="Stayhungry"
84. curl-sL$url|grep-i"$keywords"
85. if[$?-ne0];then
86. WARN_MSG=$WARN_MSG"keywords'$keywords'doesn'texistonlink$url.n"--phpfensi.com
87. return1
88. fi
89. return0
90. }
92. #useanarraytostorethereturnvalueofeachmonitoringfunction
93. mem_free
94. chk[1]=$?
95. load_avg
96. chk[2]=$?
97. cpu_idle
98. chk[3]=$?
99. network_tx
100. chk[4]=$?
101. httpd_mysqld
102. chk[5]=$?
103. home_page
104. chk[6]=$?
106. #sendwarningemailtothewebmasterifanyofthecheckfails.
107. foriin$(seq16)
108. do
109. if[${chk[i]}-ne0];then
110. printf"$WARN_MSG"|mailx-s"Warningfromsmilejay.com"$EMAIL
111. exit1
112. fi
113. done