ngx_healthcheck_module
                                nginx module for upstream servers health check.  support stream and http upstream.                             该模块可以为Nginx提供主动式后端服务器健康检查的功能(同时支持四层和七层后端服务器的健康检测)
                            
                        How to download and setup ngx_healthcheck_module
Open terminal and run command
                                            git clone https://github.com/zhouchangxun/ngx_healthcheck_module.git
                                        
                                        git clone is used to create a copy or clone of ngx_healthcheck_module repositories.
                                        You pass git clone a repository URL. it supports a few different network protocols and corresponding URL formats.
Also you may download zip file with ngx_healthcheck_module https://github.com/zhouchangxun/ngx_healthcheck_module/archive/master.zip
Or simply clone ngx_healthcheck_module with SSH
                                            [email protected]:zhouchangxun/ngx_healthcheck_module.git                                    
                                    If you have some problems with ngx_healthcheck_module
You may open issue on ngx_healthcheck_module support forum (system) here: https://github.com/zhouchangxun/ngx_healthcheck_module/issuesSimilar to ngx_healthcheck_module repositories
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