java.net.InetAddress java类不能parsingAlpine Docker容器上的IP
当我在Alpine Linux上运行Java JDK 8的容器Docker中运行以下代码时
import java.io.*; import java.util.*; import java.net.*; public class SomaDBTest { public static void main(String... args) throws Throwable { InetAddress ip = InetAddress.getByName("mysql"); System.out.println("Begin - mysql IP Addr = " + ip.getHostAddress()); . . . } } 我得到的错误：
Picked up JAVA_TOOL_OPTIONS: -Dfile.encoding=UTF8 Exception in thread "main" java.net.UnknownHostException: mysql: unknown error at java.net.Inet6AddressImpl.lookupAllHostAddr(Native Method) at java.net.InetAddress$2.lookupAllHostAddr(InetAddress.java:928) at java.net.InetAddress.getAddressesFromNameService(InetAddress.java:1323) at java.net.InetAddress.getAllByName0(InetAddress.java:1276) at java.net.InetAddress.getAllByName(InetAddress.java:1192) at java.net.InetAddress.getAllByName(InetAddress.java:1126) at java.net.InetAddress.getByName(InetAddress.java:1076) at SomaDBTest.main(SomaDBTest.java:52)
有任何想法吗 ？
顺便说一句，我可以成功运行ping mysql和nslookup命令。
# ping mysql PING mysql (172.17.0.2): 56 data bytes 64 bytes from 172.17.0.2: seq=0 ttl=64 time=0.185 ms 64 bytes from 172.17.0.2: seq=1 ttl=64 time=0.283 ms 64 bytes from 172.17.0.2: seq=2 ttl=64 time=0.424 ms # nslookup mysql Server: (null) Address 1: ::1 localhost Address 2: 127.0.0.1 localhost Name: mysql Address 1: 172.17.0.2 mysql
我的Dockerfile非常简单：
FROM frolvlad/alpine-oraclejdk8 ADD bin / WORKDIR /
SomaDBTest.java和SomaDBTest.class文件位于bin目录中。
要运行容器，请执行以下操作：
docker build -t testInetAddress . docker run -i -t testInetAddress java SomaDBTest
你可以把下面的命令放在你的Dockerfile解决这个问题
RUN echo 'hosts: files mdns4_minimal [NOTFOUND=return] dns mdns4' >> /etc/nsswitch.conf