我有一个大型Java应用程序,我正在尝试在AWS中的fargate集群上运行.图像在我的本地计算机的docker上成功运行.当我在fargate中运行它时它成功启动,但最终遇到以下错误,之后应用程序卡住了:
! java.net.UnknownHostException: 690bd678bcf4: 690bd678bcf4: Name or service not known
! at java.net.InetAddress.getLocalHost(InetAddress.java:1505) ~[na:1.8.0_151]
! at tracelink.misc.SingletonTokenDBO$.
Scala代码的违规行是:
private val machineName = InetAddress.getLocalHost().getHostName()
一些初步研究表明错误与容器中/ etc / hosts文件的内容有关.所以我创建了一个小的测试程序,它表现出与我的真实应用程序相同的行为,并且还将/ etc / hosts的内容转储到stdout:
import java.net.*;
import java.io.*;
public class NetworkTest {
public static void main(String[] args) throws InterruptedException,IOException,FileNotFoundException {
while(true) {
networkDump();
Thread.sleep(10000);
}
}
private static void networkDump() throws IOException,FileNotFoundException {
System.out.println("/etc/hosts:");
System.out.println("");
FileReader f = new FileReader("/etc/hosts");
BufferedReader reader = new BufferedReader(f);
String line = null;
while((line = reader.readLine()) != null) {
System.out.println(line);
}
System.out.println("");
dumpHostname();
}
private static void dumpHostname() {
try {
String hostname = InetAddress.getLocalHost().getHostName();
System.out.printf("Hostname: %s\n\n",hostname);
} catch(UnknownHostException e) {
System.out.println(e.getMessage());
}
}
}
Dockerfile:
FROM openjdk:8
WORKDIR /site
ADD . /site
CMD ["java","NetworkTest"]
我从AWS获得的输出如下:
/etc/hosts:
127.0.0.1 localhost
::1 localhost ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
3a5a4271a6e3: 3a5a4271a6e3: Name or service not known
与在我的本地机器上的docker中运行的输出相比:
> docker run networktest
/etc/hosts:
127.0.0.1 localhost
::1 localhost ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
172.17.0.4 82691e2fb948
Hostname: 82691e2fb948
未获得异常的本地版本在/ etc / hosts中具有主机名的条目,而AWS主机文件没有主机名的条目.我已经尝试添加一个/etc/rc.local文件来手动将主机名添加到localhost行的末尾,只需在Dockerfile中添加一个RUN命令来执行相同的操作.两者都没有任何影响.
有没有人知道是否有办法配置图像或ECS任务定义以获得在AWS中正确配置的主机名?
最佳答案
通过以下方式将主机名指向127.0.0.1:
原文链接:https://www.f2er.com/docker/436812.htmlecho "127.0.0.1 $HOSTNAME" >> /etc/hosts
修复了我的问题.
我正在使用Docker Compose.所以我有一个像这样的docker-compose.yml文件:
version: '2'
services:
myservice:
command: ["/set-hostname.sh","--","/run-service.sh"]
然后set-hostname.sh文件如下所示:
#!/bin/bash
set -e
shift
cmd="$@"
echo "127.0.0.1 $HOSTNAME" >> /etc/hosts
exec $cmd