最近有一个需求,就是需要使用 nginx 反向代理 websocket,经过查找一番资料,目前已经测试通过,本文只做一个记录
注: 看官方文档说 Nginx 在 1.3 以后的版本才支持 websocket 反向代理,所以要想使用支持 websocket 的功能,必须升级到 1.3 以后的版本,因此我这边是下载的 Tengine 的最新版本测试的
1.下载 tengine 最近的源码
wget http://tengine.taobao.org/download/tengine-2.0.3.tar.gz
2.安装基础的依赖包
yum -y install pcre* yum -y install zlib* yum -y install openssl*
3.解压编译安装
tar -zxvf tengine-2.0.3.tar.gz cd tengine-2.0.3 ./configure --prefix=安装目录 make sudo make install
nginx.conf 的配置如下:
user apps apps; worker_processes 4; # 这个由于我是用的虚拟机,所以配置的 4 ,另外 tengine 可以自动根据CPU数目设置进程个数和绑定CPU亲缘性 # worker_processes auto # worker_cpu_affinity autoerror_log logs/error.log;
pid logs/nginx.pid;
#Specifies the value for maximum file descriptors that can be opened by this process. worker_rlimit_nofile 65535;
events { use epoll; worker_connections 65535; }
# load modules compiled as Dynamic Shared Object (DSO) # #dso { # load ngx_http_fastcgi_module.so; # load ngx_http_rewrite_module.so; #}
http { include mime.types; default_type application/octet-stream;
server_names_hash_bucket_size 128; client_header_buffer_size 4k; large_client_header_buffers 4 32k; client_max_body_size 80m;
sendfile on; tcp_nopush on;
client_body_timeout 5; client_header_timeout 5; keepalive_timeout 5; send_timeout 5;
open_file_cache max=65535 inactive=20s; open_file_cache_valid 30s; open_file_cache_min_uses 1;
tcp_nodelay on;
fastcgi_connect_timeout 300; fastcgi_send_timeout 300; fastcgi_read_timeout 300; fastcgi_buffer_size 64k; fastcgi_buffers 4 64k; fastcgi_busy_buffers_size 128k; fastcgi_temp_file_write_size 128k;
client_body_buffer_size 512k; proxy_connect_timeout 5; proxy_read_timeout 60; proxy_send_timeout 5; proxy_buffer_size 16k; proxy_buffers 4 64k; proxy_busy_buffers_size 128k; proxy_temp_file_write_size 128k;
gzip on; gzip_min_length 1k; gzip_buffers 4 16k; gzip_http_version 1.0; gzip_comp_level 2; gzip_types text/plain application/x-javascript text/css application/xml; gzip_vary on; proxy_temp_path /dev/shm/temp; proxy_cache_path /dev/shm/cache levels=2:2:2 keys_zone=cache_go:200m inactive=5d max_size=7g;
log_format log_access '$remote_addr - $remote_user [$time_local] "$request" "$request_time" "$upstream_response_time"' '$status $body_bytes_sent "$http_referer" ' '"$http_user_agent" $http_x_forwarded_for $host $hostname' ;
#websocket 需要加下这个 map $http_upgrade $connection_upgrade { default upgrade; '' close; }
include /home/apps/tengine/conf/test.com;
}
test.com 的配置文件内容:
upstream test.com { server 192.168.1.5:9000; }server { listen 80; server_name test.com;
#charset koi8-r;
#access_log logs/host.access.log main;
location ^~ /websocket { proxy_pass http://test.com;
proxy_redirect off; proxy_set_header X-Real-IP $remote_addr; proxy_set_header Host $host; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_http_version 1.1; proxy_set_header Upgrade $http_upgrade; proxy_set_header Connection "upgrade"; }
}
解析 map 指令
上面 nginx.conf 配置中的 map $http_upgrade $connection_upgrade 的作用,参考 http://www.ttlsa.com/nginx/using-nginx-map-method/
该作用主要是根据客户端请求中 $http_upgrade 的值,来构造改变 $connection_upgrade 的值,即根据变量 $http_upgrade 的值创建新的变量 $connection_upgrade,创建的规则就是 {} 里面的东西,请见配置:
map $http_upgrade $connection_upgrade { default upgrade; '' close; }
其中的规则没有做匹配,因此使用默认的,即 $connection_upgrade 的值会一直是 upgrade。然后如果 $http_upgrade为空字符串的话,那值会是 close。个人的理解!