[英]Can't access Docker container by name in same network
我使用以下Java類建立了一個非常簡單的套接字通信:
Server.java
:
public class Server
{
public static void main(String[] args) throws Exception
{
try (ServerSocket listener = new ServerSocket(59090))
{
while (true)
{
try (Socket socket = listener.accept())
{
Scanner in = new Scanner(socket.getInputStream());
while (in.hasNextLine())
{
System.out.println("UPPER CASE: " + in.nextLine().toUpperCase());
}
}
}
}
}
}
Client.java
:
public class Client
{
public static void main(String[] args) throws Exception
{
try (Socket socket = new Socket("172.17.0.2", 59090))
{
PrintWriter out = new PrintWriter(socket.getOutputStream(), true);
while (true)
{
Thread.sleep(1000);
out.println("hello world");
}
}
}
}
我想將它們作為單獨的Docker容器運行,所以我創建了相應的Dockerfile
和docker-compose.yml
:
Dockerfile
(服務器):
FROM openjdk:13-ea-16-jdk-alpine3.9
RUN mkdir -p /app/server
WORKDIR /app/server
COPY ./Server.java ./
RUN javac Server.java
ENTRYPOINT ["java", "Server"]
Dockerfile
(客戶端):
FROM openjdk:13-ea-16-jdk-alpine3.9
RUN mkdir -p /app/client
WORKDIR /app/client
COPY ./Client.java ./
RUN javac Client.java
ENTRYPOINT ["java", "Client"]
docker-compose.yml
:
version: "3.7"
services:
client:
image: utku/socket-client:0.1.0
build: ./client
server:
image: utku/socket-server:0.1.0
build: ./server
使用docker-compose build
並首先運行server
然后使用docker run ...
client
,我看到Server的IP變為172.17.0.2
,Client的IP變為172.17.0.3
。 這就是我在Client.java
相應行中指定IP地址的原因:
// Client.java
try (Socket socket = new Socket("172.17.0.2", 59090))
Docker文檔聲明我應該能夠使用其服務名稱fofllows從client
訪問server
,fofllows是docker-compose.yml
server
。
// Client.java
try (Socket socket = new Socket("server", 59090))
但是,當我嘗試用服務器的服務名稱替換此IP地址時,我收到以下錯誤:
Exception in thread "main" java.net.UnknownHostException: server
at java.base/java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:224)
at java.base/java.net.SocksSocketImpl.connect(SocksSocketImpl.java:350)
at java.base/java.net.Socket.connect(Socket.java:620)
at java.base/java.net.Socket.connect(Socket.java:568)
at java.base/java.net.Socket.<init>(Socket.java:459)
at java.base/java.net.Socket.<init>(Socket.java:236)
at Client.main(Client.java:12)
你能指出我在這里失蹤的東西嗎?
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