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

迈不过友情╰ 2022-05-25 03:17 214阅读 0赞

**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

![20180507150758990][]

![20180507150847512][]

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

如果有不清楚的请到 630300475qq群。

[20180507150758990]: /images/20220525/28d3abb466744e7a99980924626941d6.png
[20180507150847512]: /images/20220525/719b95d8bd8e4df99a47a3ee4c433ced.png