解决nginx 503 Service Temporarily Unavailable方法示例

最近网站刷新后经常出现503 Service Temporarily Unavailable错误，有时有可以，联想到最近在nginx.conf里做了单ip访问次数限制，(limit_req_zone $binary_remote_addr zone=allips:20m rate=20r/s;) 把这个数量放大后在刷新发现问题解决。（还顺便把这个改大了 limit_req zone=allips burst=50 nodelay;   ）为了证实该问题，反复改动该数量测试发现问题确实在这。这个数量设得太小有问题，通过fiddler发现web页面刷新一下，因为页面上引用的js,css,图片都算一个连接。所以单个页面刷新下就有可能刷爆这个限制，超过这个限制就会提示503 Service Temporarily Unavailable。

附上nginx.conf

1. #user nobody;
2. worker_processes 1;
3. #worker_rlimit_nofile 100000;
4. #error_log logs/error.log;
5. #error_log logs/error.log notice;
6. #error_log logs/error.log info;
7.  
8. #pid logs/nginx.pid;
9.  
10. events {
11. worker_connections 1024;
12. }
13.  
14. http {
15. include mime.types;
16. default_type application/octet-stream;
17.  
18. ##cache##
19. proxy_connect_timeout 5;
20. proxy_read_timeout 60;
21. proxy_send_timeout 5;
22. proxy_buffer_size 16k;
23. proxy_buffers 4 64k;
24. proxy_busy_buffers_size 128k;
25. proxy_temp_file_write_size 128k;
26. proxy_temp_path /home/temp_dir;
27. proxy_cache_path /usr/local/nginx/cache levels=1:2 keys_zone=cache_one:200m inactive=1dmax_size=30g;
28. ##end##
29. #limit per ip per second access times 10
30. limit_req_zone $binary_remote_addr zone=allips:20m rate=20r/s;
31.  
32. #log_format main '$remote_addr - $remote_user [$time_local] "$request" '
33. # '$status $body_bytes_sent "$http_referer" '
34. # '"$http_user_agent" "$http_x_forwarded_for"';
35.  
36. #access_log logs/access.log main;
37.  
38. sendfile on;
39. #tcp_nopush on;
40.  
41. #keepalive_timeout 0;
42. keepalive_timeout 65;
43.  
44. #gzip on;
45. upstream myweb80{
46. ip_hash;
47. server 192.168.3.105:80;
48. server 192.168.3.103:80;
49. }
50.  
51. upstream myweb8080{
52. ip_hash;
53. server 192.168.3.222:10080;
54. #server 192.168.3.103:8080;
55. }
56. upstream myweb10086{
57. ip_hash;
58. server 192.168.3.102:10086;
59. server 192.168.3.108:10086;
60. }
61. upstream myweb443{
62. ip_hash;
63. server 192.168.3.105:443;
64. server 192.168.3.103:443;
65. }
66.  
67. # another virtual host using mix of IP-, name-, and port-based configuration
68. #
69. server {
70. listen 80;
71. allow 218.17.158.2;
72. allow 127.0.0.0/24;
73. allow 192.168.0.0/16;
74. allow 58.251.130.1;
75. allow 183.239.167.3;
76. allow 61.145.164.1;
77. deny all;
78. server_name myweb.com;
79. location / {
80. proxy_pass http://myweb80;
81. proxy_set_header X-Real-IP $remote_addr;
82. limit_req zone=allips burst=50 nodelay;
83. }
84. }
85.  
86. server {
87. listen 8080;
88. allow 218.17.158.2;
89. allow 127.0.0.0/24;
90. allow 192.168.0.0/16;
91. allow 58.251.130.1;
92. allow 183.239.167.3;
93. allow 61.145.164.1;
94. deny all;
95. location / {
96. proxy_pass http://myweb8080;
97. proxy_set_header X-Real-IP $remote_addr;
98. limit_req zone=allips burst=50 nodelay;
99. }
100. }
101.  
102. # HTTPS server
103. #
104. server {
105. listen 10086 ssl;
106. server_name localhost;
107. allow 218.17.158.2;
108. allow 127.0.0.0/24;
109. allow 192.168.0.0/16;
110. allow 58.251.130.1;
111. allow 183.239.167.3;
112. allow 61.145.164.1;
113. #deny all;
114. ssl_certificate ssl/1_www.myweb.com_bundle.crt;
115. ssl_certificate_key ssl/2_www.myweb.com.key;
116.  
117. # ssl_session_cache shared:SSL:1m;
118. # ssl_session_timeout 5m;
119.  
120. # ssl_ciphers HIGH:!aNULL:!MD5;
121. # ssl_prefer_server_ciphers on;
122.  
123. location / {
124. proxy_pass https：// myweb10086;
125. #roft html;
126. #index index.html index.htm;
127. }
128. }
129.  
130. 服务器{
131. listen 443 ssl;
132. server_name localhost;
133.  
134. ssl_certificate ssl / 1_www.myweb.com_bundle.crt;
135. ssl_certificate_key ssl / 2_www.myweb.com.key;
136.  
137. #ssl_session_cache共享：SSL：1m;
138. #ssl_session_timeout 5m;
139.  
140. #ssl_ciphers HIGH：！aNULL：！MD5;
141. #ssl_prefer_server_ciphers on;
142.  
143. location / {
144. proxy_pass https：// myweb443;
145. #roft html;
146. #roft html;
147. #index index.html index.htm;
148. }
149. }
150. }

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