环境准备：

原理描述：

将Nginx的负载均衡后端服务器配置信息写入consul的接口中，upsync插件通过读取consul的配置，然后持久化到nginx的一个配置文件，nginx通过读取这个配置文件来进行负载均衡

.    重新编译安装tengine2..3将upsync这个插件

关键插件：--add-module=/usr/local/src/nginx-upsync-module-nginx-upsync-1.8.x

./configure --prefix=/usr/local/tengine-2.2.3_upsync --with-ld-opt=-Wl,-rpath, --user=daemon --group=daemon --with-http_ssl_module --with-http_realip_module --with-http_addition_module --with-http_xslt_module --with-http_sub_module --with-http_stub_status_module --with-http_dav_module --with-http_flv_module --with-http_mp4_module --with-http_gzip_static_module --with-http_geoip_module --with-http_secure_link_module --with-http_degradation_module --with-mail_ssl_module --with-http_sysguard_module --with-http_concat_module --with-pcre=/usr/local/lab/pcre-8.34 --with-zlib=/usr/local/lab/zlib-1.2. --add-module=/usr/local/lab/ngx_cache_purge-2.3 --with-jemalloc --with-http_upstream_check_module --with-http_lua_module --with-luajit-lib=/usr/local/lib/ --with-luajit-inc=/usr/local/include/luajit-2.0/ --with-lua-inc=/usr/local/include/luajit-2.0/ --with-lua-lib=/usr/local/lib/ --with-openssl=/usr/local/lab/openssl-1.1.0i --add-module=/usr/local/ngx_http_geoip2_module-3.2 --add-module=/usr/local/src/nginx-upsync-module-nginx-upsync-1.8.x

.启动consul

consul agent -dev -ui -node=consul-dev -client=10.11.0.210

Nginx的配置：

upstream itmayiedu{

        server 127.0.0.1:;

        upsync 10.11.0.210:/v1/kv/upstreams/itmayiedu upsync_timeout=6m upsync_interval=500ms upsync_type=consul strong_dependency=off;

        upsync_dump_path /usr/local/tengine-2.2.3_upsync/conf/vhost.d/itmayiedu;

    }

        server {

        listen         default_server;

        server_name  localhost;

        location / {

        proxy_pass http://itmayiedu;

        proxy_set_header  Host  $host;

        proxy_set_header  X-Real-IP  $remote_addr;

        proxy_set_header  X-Forwarded-For  $proxy_add_x_forwarded_for;

        add_header    real $upstream_addr;

        }

# 其中一台后端的配置