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Posted to notifications@dubbo.apache.org by GitBox <gi...@apache.org> on 2022/03/04 13:13:22 UTC
[GitHub] [dubbo] suffrajet opened a new 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
suffrajet opened a new issue #9737:
URL: https://github.com/apache/dubbo/issues/9737
1、网络情况：
#ifconfig
docker0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 172.17.0.1 netmask 255.255.0.0 broadcast 172.17.255.255
...
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.0.26 netmask 255.255.255.0 broadcast 192.168.0.255
...
lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
...
2、dubbo服务启动日志：
2022-03-04 19:15:08.402 INFO 17115 --- [ main] o.a.d.c.deploy.DefaultModuleDeployer : [DUBBO] Dubbo Module[1.1.0] has been initialized!, dubbo version: 3.0.5, current host: 172.17.0.1
2022-03-04 19:15:08.413 INFO 17115 --- [ main] o.a.d.c.deploy.DefaultModuleDeployer : [DUBBO] Dubbo Module[1.1.1] has been initialized!, dubbo version: 3.0.5, current host: 172.17.0.1
2022-03-04 19:15:08.419 INFO 17115 --- [ main] o.a.d.c.d.DefaultApplicationDeployer : [DUBBO] No value is configured in the registry, the MetadataReportFactory extension[name : nacos] supports as the metadata center, dubbo version: 3.0.5, current host: 172.17.0.1
目标是要取到eth0的IP，但是始终获取到的是docker0的IP。
尝试配置protocol、provider下的host，不生效，尝试修改hostname，不生效，尝试配置-DDUBBO_IP_TO_REGISTRY，-DDUBBO_IP_TO_BIND，均不能解决问题。
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[GitHub] [dubbo] suffrajet removed 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
Posted by GitBox <gi...@apache.org>.
suffrajet removed a comment on issue #9737:
URL: https://github.com/apache/dubbo/issues/9737#issuecomment-1059152146
补充一下，同样的服务在未安装docker的机器上正常。2.7.x版本下没有此问题。
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[GitHub] [dubbo] VirensCn commented 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
Posted by GitBox <gi...@apache.org>.
VirensCn commented 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)
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
`
import static org.apache.dubbo.common.constants.CommonConstants.DUBBO_IP_TO_BIND;
import java.lang.reflect.Method;
import java.net.InetAddress;
import java.net.NetworkInterface;
import java.util.Enumeration;
import java.util.List;
import java.util.regex.Pattern;
import org.apache.dubbo.common.utils.NetUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import cn.hutool.core.net.NetUtil;
import cn.hutool.core.util.ReflectUtil;
import cn.hutool.core.util.StrUtil;
import cn.virens.common.exception.APIException;
import cn.virens.common.exception.ExceptionUtil;
public class DubboNet {
private static final Pattern IP_PATTERN = Pattern.compile("\\d{1,3}(\\.\\d{1,3}){3,5}$");
private static Logger logger = LoggerFactory.getLogger(DubboNet.class);
private static final String DOCKER_GWBRIDGE = "172.18.";
private static final String DOCKER_INGRESS = "10.0.0.";
/** 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(getLocalHost());
}
}
/** 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);
}
/** 获取dubbo默认绑定的IP地址 */
public static String getDubboIpToBind() throws APIException {
return System.getProperty(DUBBO_IP_TO_BIND);
}
/** 获取当前有效的IP，主要是屏蔽了docker_gwbridge的IP端 */
public static String getLocalHost() throws APIException {
for (NetworkInterface network : getNetworkInterfaces()) {
String host = getHostAddress(network);//
if (host != null && !host.isEmpty()) {
return host;//
}
}
return NetUtil.getLocalhostStr();
}
private static String getHostAddress(NetworkInterface inter) throws APIException {
Enumeration<InetAddress> enumer = inter.getInetAddresses();
while (enumer != null && enumer.hasMoreElements()) {
InetAddress addr = enumer.nextElement();
if (Boolean.TRUE.equals(isValidHost(addr))) {
return addr.getHostAddress();//
}
}
return null;
}
/** 获取有效的网卡列表 */
private static List<NetworkInterface> getNetworkInterfaces() throws APIException {
return ExceptionUtil.safe1(logger, () -> invokeStatic("getValidNetworkInterfaces"));
}
/** 验证地址是否有效（是否可到达） */
private static Boolean isValidHost(InetAddress addr) throws APIException {
if (addr != null && isValidHost(addr.getHostAddress())) {
return ExceptionUtil.safe1(logger, () -> {
return addr.isReachable(100);
});
} else {
return false;
}
}
/** 验证地址是否有效（IP格式正确） */
private static boolean isValidHost(String addr) throws APIException {
if (addr != null && IP_PATTERN.matcher(addr).matches()) {
if (StrUtil.startWith(addr, DOCKER_GWBRIDGE)) {
return false;//
}
if (StrUtil.startWith(addr, DOCKER_INGRESS)) {
return false;//
}
return NetUtils.isValidLocalHost(addr);
} else {
return false;
}
}
/** 调用Dubbo.NetUtils的私有静态方法 */
@SuppressWarnings("unchecked")
private static <R> R invokeStatic(String methodName) throws APIException {
Method method = ReflectUtil.getMethodByName(NetUtils.class, methodName);
if (method != null) {
return (R) ReflectUtil.invokeStatic(method);
} else {
return null;
}
}
}
`
` private static final String DOCKER_GWBRIDGE = "172.18.";
private static final String DOCKER_INGRESS = "10.0.0.";`
这2个是需要被过滤掉的，据观察docker swarm 的容器中有2个无用IP端，这2个还会优先有效的，所以需要过滤，可以自行判断需要过滤的IP端。。
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[GitHub] [dubbo] suffrajet commented 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
Posted by GitBox <gi...@apache.org>.
suffrajet commented on issue #9737:
URL: https://github.com/apache/dubbo/issues/9737#issuecomment-1059152146
补充一下，同样的服务在未安装docker的机器上正常。
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[GitHub] [dubbo] suffrajet 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
Posted by GitBox <gi...@apache.org>.
suffrajet edited a comment on issue #9737:
URL: https://github.com/apache/dubbo/issues/9737#issuecomment-1059152146
补充一下，同样的服务在未安装docker的机器上正常。2.7.x版本下没有此问题。
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[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
Posted by 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)
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
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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[GitHub] [dubbo] suffrajet commented 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
Posted by GitBox <gi...@apache.org>.
suffrajet commented on issue #9737:
URL: https://github.com/apache/dubbo/issues/9737#issuecomment-1060123399
非常感谢 @VirensCn 细致的解答
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[GitHub] [dubbo] AlbumenJ commented 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
Posted by GitBox <gi...@apache.org>.
AlbumenJ commented on issue #9737:
URL: https://github.com/apache/dubbo/issues/9737#issuecomment-1067671289
You can use `DUBBO_NETWORK_IGNORED_INTERFACE` and `DUBBO_PREFERRED_NETWORK_INTERFACE` to specify network interface.
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