使用nginx作为tcp代理的安装配置例子

使用nginx作为tcp代理的安装配置例子

以前一般代理tcp时候，都选用haproxy。nginx 1.9 之后，就多了一个选择。可以使用nginx做代理。这样大家也不用重新去熟悉haproxy。
tcp 代理本质是 端口到端口映射转发，比较简单。没有http层代理那么复杂。我一般用来代理https，大家都知道，以前使用nginx 代理https要配置证书等各种琐事。然而对于tcp层来说，没有证书一说。纯粹转发简单干净的配置，非常的爽; 当然有时候也用tcp替换http层代理。原因是tcp代理配置更加简单，性能也更高。

一、nginx 下载安装

方式一：下载地址：http://nginx.org/en/download.html方式二：通过rpm包安装

1、添加安装源，在/etc/yum.repos.d底下创建文件nginx.repo

1. [nginx]
2. name=nginx repo
3. baseurl=http://nginx.org/packages/centos/$releasever/$basearch/
4. gpgcheck=0
5. enabled=1

2、安装nginx

1. #yum clean all
2. #yum install nginx

3、查看安装路径和版本

1. #whereis nginx
2. #/usr/sbin/nginx -v
3. nginx version: nginx/1.10.1

4、查看缺省配置文件路径

1. #/usr/sbin/nginx -h
2. -c filename : set configuration file (default: /etc/nginx/nginx.conf)

二、nginx配置

1、目录规划

1. mkdir -p /opt/service/nginx/conf
2. mkdir -p /opt/logs/nginx
3. cd /opt/service/nginx
4. ln -s /usr/sbin/nginx
5. ln -s /opt/logs/nginx log

/opt/service/nginx/
├── conf
├── log -> /opt/logs/nginx
└── nginx -> /usr/sbin/nginx

2、配置nginx.conf

1. user nginx;
2. worker_processes 16;
3. worker_rlimit_nofile 100000;
5. error_log /opt/service/nginx/log/error.log error;
6. pid /opt/service/nginx/nginx.pid;
7. 
   events {
8. use epoll;
9. worker_connections 10240;
10. }
12. include /opt/service/nginx/conf/*.conf;

3、配置tcp 代理
/opt/service/nginx/conf/nginx_tcp_proxy.conf

1. stream {
2. #---------------------------------------------------------------------
3. # tcp 代理
4. #---------------------------------------------------------------------
5. upstream weixin_proxy {
6. hash $remote_addr consistent;
7. server wx.qq.com:443 weight=1 max_fails=3 fail_timeout=60s;
8. }
10. server {
11. listen 443;
12. proxy_connect_timeout 10s;
13. proxy_pass weixin_proxy;
14. proxy_buffer_size 64k;
15. }
16. }

三、启动维护nginx

1、编辑 nginx.sh

1. #!/bin/sh
   
2. # description:nginx server
   
3. # nginx - this script is used to control nginx service
   
4. # processname nginx
   
5. # nginx version: nginx/1.10.1
   
6. 
   
7. nginx="/usr/sbin/nginx"
   
8. prog="nginx"
   
9. conf_file="/etc/nginx/nginx.conf"
   
10. 
    
11. start() {
    
12. if [ `pgrep $prog | wc -l` -eq 2 ];then
    
13. if [ -x $nginx ] && [ -f $conf_file ];then
    
14. $nginx -c $conf_file
    
15. ret=$?
    
16. if [ $ret -eq 0 ];then
    
17. echo "$prog start successed"
    
18. else
    
19. echo "$prog start failed"
    
20. fi
    
21. else
    
22. echo "$prog config file not exist"
    
23. fi
    
24. else
    
25. num=`pgrep $prog `
    
26. echo "$prog is already started ... $num "
    
27. fi
    
28. }
    
29. 
    
30. 
    
31. stop() {
    
32. if [ `pgrep $prog | wc -l` -ne 2 ];then
    
33. killall -9 $prog
    
34. ret=$?
    
35. if [ $ret -eq 0 ];then
    
36. echo "$prog stop successed"
    
37. else
    
38. echo "$prog stop failed"
    
39. fi
    
40. else
    
41. echo "$prog is already stopped ..."
    
42. fi
    
43. }
    
44. 
    
45. restart() {
    
46. stop
    
47. sleep 2
    
48. start
    
49. }
    
50. 
    
51. reload() {
    
52. if [ `pgrep $prog | wc -l` -ne 0 ];then
    
53. pid=`ps -ef | grep $prog | grep master | awk '{print $2}'`
    
54. if [ -x $nginx ] && [ -f $conf_file ];then
    
55. kill -HUP $pid
    
56. ret=$?
    
57. if [ $ret -eq 0 ];then
    
58. echo "$prog reload successed"
    
59. else
    
60. echo "$prog reload failed"
    
61. fi
    
62. else
    
63. echo "$prog config file is not exist"
    
64. fi
    
65. else
    
66. echo "$prog is stopped, please start $prog first ..."
    
67. fi
    
68. }
    
69. 
    
70. check() {
    
71. if [ -x $nginx ] && [ -f $conf_file ];then
    
72. $nginx -t -c $conf_file
    
73. ret=$?
    
74. if [ $ret -eq 0 ];then
    
75. echo "$prog check successed"
    
76. else
    
77. echo "$prog check failed"
    
78. fi
    
79. else
    
80. echo "$prog program or config file not exit!"
    
81. fi
    
82. }
    
83. 
    
84. case $1 in
    
85. start)
    
86. start
    
87. ;;
    
88. stop)
    
89. stop
    
90. ;;
    
91. restart)
    
92. restart
    
93. ;;
    
94. reload)
    
95. reload
    
96. ;;
    
97. check)
    
98. check
    
99. ;;
    
100. *)
     
101. echo "Usage: $0 {start|stop|restart|reload|check}"
     
102. esac

2、启动nginx.sh

1. chmod a+rwx nginx.sh
2. ./nginx.sh restart

整个目录结构如下

1. # ll
   
2. total 8
   
3. drwxr-xr-x 2 root root 33 Dec 21 17:16 conf
   
4. lrwxrwxrwx 1 root root 15 Dec 21 17:00 log -> /opt/logs/nginx
   
5. lrwxrwxrwx 1 root root 15 Dec 21 16:59 nginx -> /usr/sbin/nginx
   
6. -rw-r--r-- 1 root root 6 Dec 21 17:21 nginx.pid
   
7. -rwxrwxrwx 1 root root 2172 Dec 21 17:20 nginx.sh

问题：
当代理的后端是域名的时候，域名的dns发生变化。nginx并不知道。看文档nginx提供了定时刷新dns的功能，但是我配置好像没有起到作用。
在 nginx.conf 尾部加上这个配置
resolver 100.100.2.136 valid=1s;
include /etc/nginx/nginx_vhost/*.conf;