openresty+lua 动态更新upstram里的server （上）----配置upstream和health_check

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环境描述：

192.168.0.16 启动一个Apache，访问80端口 返回 192.168.0.16 esbrunning

192.168.0.17 启动一个Apache，访问80端口 返回192.168.0.17 esbrunning

                   启动一个openresty,访问8000端口轮询转发到192.168.016和192.168.0.17的80端口

步骤一：

    （1）192.168.0.16和192.168.0.17启动一个Apache，配置好80端口

    （2）192.168.0.17安装一个openresty，配置server的端口是8000

 listen       8000;
 server_name  192.168.0.17;

user   nobody;
worker_processes  3;

步骤二：

    （1）修改nginx.conf的http模块，添加upstream

    upstream  tomcatproxy {
        server   192.168.0.16:80 weight=1;
        server   192.168.0.17:80 weight=1;
    }

  （2）修改nginx.conf的http模块，添加upstream的检查模块

        lua_shared_dict healthcheck 1m;
        init_worker_by_lua_block {
        local hc = require "resty.upstream.healthcheck"

        local ok, err = hc.spawn_checker{
            shm = "healthcheck",  -- defined by "lua_shared_dict"
            upstream = "tomcatproxy", -- defined by "upstream"
            type = "http",

            http_req = "GET /index.html HTTP/1.0\r\nconnection: keep-alive\r\n\r\n",
                    -- raw HTTP request for checking

            interval = 2000,  -- run the check cycle every 2 sec
            timeout = 1000,   -- 1 sec is the timeout for network operations
            fall = 3,  -- # of successive failures before turning a peer down
            rise = 2,  -- # of successive successes before turning a peer up
            valid_statuses = {200, 302},  -- a list valid HTTP status code
            concurrency = 10,  -- concurrency level for test requests
        }
        if not ok then
            ngx.log(ngx.ERR, "failed to spawn health checker: ", err)
            return
        end
    }

（3）修改nginx.conf的server模块

    location / {
            proxy_pass http://tomcatproxy/;
            proxy_set_header     x-forward-for  $proxy_add_x_forwarded_for;
               }

（4）重启openresty

步骤三：

    （1）测试一下转发功能

     

请到下篇进行lua脚本配置，https://blog.csdn.net/u014686399/article/details/80226161

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