1、安装 openresty 依赖模块：
[root@Centos opt]# yum -y install pcre-devel openssl openssl-devel postgresql-devel
2、编译安装 openresty：
[root@Centos opt]# tar -zxvf openresty-1.15.8.2.tar.gz ...（略去内容）... [root@Centos opt]# cd openresty-1.15.8.2/ [root@Centos openresty-1.15.8.2]# ll 总用量 112 drwxrwxr-x. 47 hacker 1003 4096 11月 12 23:35 build drwxrwxr-x. 46 hacker 1003 4096 8月 29 13:33 bundle -rwxrwxr-x. 1 hacker 1003 52432 8月 29 13:32 configure -rw-rw-r--. 1 hacker 1003 22924 8月 29 13:32 COPYRIGHT -rw-r--r--. 1 root root 5980 11月 12 23:36 Makefile drwxrwxr-x. 2 hacker 1003 203 8月 29 13:32 patches -rw-rw-r--. 1 hacker 1003 4689 8月 29 13:32 README.markdown -rw-rw-r--. 1 hacker 1003 8972 8月 29 13:32 README-windows.txt drwxrwxr-x. 2 hacker 1003 52 8月 29 13:32 util [root@Centos openresty-1.15.8.2]# ./configure --prefix=/usr/local/openresty --with-luajit --without-http_redis2_module --with-http_iconv_module --with-http_postgres_module ...（略去内容）... [root@Centos openresty-1.15.8.2]# gmake && gmake install ...（略去内容）...
3、编辑 nginx.conf 文件，编辑后内容为：
http { include mime.types; default_type application/octet-stream; sendfile on; keepalive_timeout 65; lua_shared_dict ups_zone 1m; # 定义upstream共享内存空间 upstream web-cluster { server 127.0.0.1:8087; server 127.0.0.1:8088; } upstream web-8087 { server 127.0.0.1:8087; } upstream web-8088 { server 127.0.0.1:8088; } server { listen 80; server_name localhost; #charset koi8-r; #access_log logs/host.access.log main; location /forward { default_type text/html; content_by_lua_block { local host = ngx.req.get_uri_args()["host"] local key = "switchKey" ngx.shared.ups_zone:set(key, host) local forward_ip = ngx.shared.ups_zone:get(key) ngx.say("Successfully, forwarded host is: ", forward_ip) } } location ~ /web/(.*) { set_by_lua_block $my_ups { local key = ngx.shared.ups_zone:get("switchKey") if key == nil or key == "default" then return "web-cluster" else local port = string.sub(key, -4) if port == "8087" then return "web-8087" elseif port == "8088" then return "web-8088" end end } proxy_pass http://$my_ups/$1; } } }
4、测试是否生效：
（1）默认负载均衡模式：
[root@Centos conf]# curl http://127.0.0.1/forward?host=default Successfully, forwarded host is: default [root@Centos conf]# curl http://127.0.0.1/web/lua 8088 server [root@Centos conf]# curl http://127.0.0.1/web/lua 8087 server [root@Centos conf]# curl http://127.0.0.1/web/lua 8088 server [root@Centos conf]# curl http://127.0.0.1/web/lua 8087 server [root@Centos conf]# curl http://127.0.0.1/web/lua 8088 server [root@Centos conf]# curl http://127.0.0.1/web/lua 8087 server [root@Centos conf]# curl http://127.0.0.1/web/lua 8088 server [root@Centos conf]# curl http://127.0.0.1/web/lua 8087 server [root@Centos conf]#
（2）将所有请求转移到 8087 server：
[root@Centos conf]# curl http://127.0.0.1/forward?host=127.0.0.1:8087 Successfully, forwarded host is: 127.0.0.1:8087 [root@Centos conf]# curl http://127.0.0.1/web/lua 8087 server [root@Centos conf]# curl http://127.0.0.1/web/lua 8087 server [root@Centos conf]# curl http://127.0.0.1/web/lua 8087 server [root@Centos conf]# curl http://127.0.0.1/web/lua 8087 server [root@Centos conf]# curl http://127.0.0.1/web/lua 8087 server [root@Centos conf]# curl http://127.0.0.1/web/lua 8087 server [root@Centos conf]# curl http://127.0.0.1/web/lua 8087 server [root@Centos conf]#
（3）将所有请求转移到 8088 server：
[root@Centos conf]# curl http://127.0.0.1/forward?host=127.0.0.1:8088 Successfully, forwarded host is: 127.0.0.1:8088 [root@Centos conf]# curl http://127.0.0.1/web/lua 8088 server [root@Centos conf]# curl http://127.0.0.1/web/lua 8088 server [root@Centos conf]# curl http://127.0.0.1/web/lua 8088 server [root@Centos conf]# curl http://127.0.0.1/web/lua 8088 server [root@Centos conf]# curl http://127.0.0.1/web/lua 8088 server [root@Centos conf]# curl http://127.0.0.1/web/lua 8088 server [root@Centos conf]# curl http://127.0.0.1/web/lua 8088 server [root@Centos conf]#
参考书籍：《OpenResty最佳实践》PDF版，《OpenResty完全开发指南》
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