[GitHub] [dubbo] VirensCn edited a comment on issue #9737: 在安装了docker的机器上启动dubbo服务，provider取到的host始终是docker网段的ip

[GitBox <gi...@apache.org>]

VirensCn edited a comment on issue #9737:
URL: https://github.com/apache/dubbo/issues/9737#issuecomment-1059686917


   是他们改了代码，去掉了这部分[ServiceConfig.java](https://github.com/apache/dubbo/commit/901cf6f60c1c72ebb0659d77f4569b87f51bad40#diff-b90db27a4d125d825b93979c962b2d2e7d8c69d2528c0404d4a6ea7cd03169b0)
   
   ![image](https://user-images.githubusercontent.com/9736815/156868360-a77349ad-9d7a-4fab-adc5-79d2b825d48d.png)
   
   以前会尝试连接注册中心，然后从Socket中获取本地IP，现在直接获取网卡的了。。
   
   我现在是在启动时，先获取IP然后存环境变量后正常启动
   ![image](https://user-images.githubusercontent.com/9736815/156868533-43603ab5-dd5a-444e-8d92-4849abcbdb36.png)
   
   我发现在docker环境中都有环境变量`HOSTNAME`,那么可以根据HOSTNAME获取对应的IP即可。
   ```	
   	/** 初始化dubbo默认绑定的IP地址(是否覆盖环境变量) */
   	public static void initDubboIpToBind(boolean replace) throws APIException {
   		String last = System.getProperty(DUBBO_IP_TO_BIND);
   		if (last == null || last.isEmpty() || replace) {
   			setDubboIpToBind(getIpByDocker());
   		}
   	}
   
   	/** 如果在docker环境就根据hostname获取对应ip，否则按正常方式获取 */
   	private static String getIpByDocker() throws APIException {
   		String hostname = getHostNameByDocker();
   
   		if (hostname != null && !hostname.isEmpty()) {
   			return NetUtil.getIpByHost(hostname);//
   		} else {
   			return NetUtils.getLocalHost();
   		}
   	}
   
   	/** 获取在docker环境中的hostname */
   	private static String getHostNameByDocker() throws APIException {
   		String hostname = System.getProperty("HOSTNAME");
   		if (hostname == null || hostname.isEmpty()) {
   			return System.getenv("HOSTNAME");
   		} else {
   			return hostname;
   		}
   	}
   
   	/** 必须要在dubbo应用启动之前调用 */
   	private static void setDubboIpToBind(String host) throws APIException {
   		System.setProperty(DUBBO_IP_TO_BIND, host);
   	}
   ```
    
    1. `NetUtil`=`cn.hutool.core.net.NetUtil`
    2. `NetUtils`=`org.apache.dubbo.common.utils.NetUtils`
   


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