How to use docker-java API to connect docker?

问题

I'm new to docker, and I want to use java api to print my docker information. Then I find the Api in this link about docker-java. And I found my boot2docker ip is 196.168.59.103:2376. And I use this command:

docker -H tcp://192.168.59.103:2376 version

It can succeed and show me this information:

Client version: 1.7.0
Client API version: 1.19
Go version (client): go1.4.2
Git commit (client): 0baf609
OS/Arch (client): darwin/amd64
Server version: 1.7.0
Server API version: 1.19
Go version (server): go1.4.2
Git commit (server): 0baf609
OS/Arch (server): linux/amd64

Then, I new a maven project in eclipse, and run this code:

public static void main(String[] args) {
        DockerClient dockerClient = DockerClientBuilder.getInstance("http://192.168.59.103:2376").build();
        Info info = dockerClient.infoCmd().exec();
        System.out.print(info);
    }

But, it didn't work at all, and throw the exception about this:

The server failed to respond with a valid HTTP response

And,I use command curl to connect:

curl -v http://192.168.59.103:2376/info

It show me information is below:

* Hostname was NOT found in DNS cache
*   Trying 192.168.59.103...
* Connected to 192.168.59.103 (192.168.59.103) port 2376 (#0)
> GET /info HTTP/1.1
> User-Agent: curl/7.37.1
> Host: 192.168.59.103:2376
> Accept: */*
> 

* Connection #0 to host 192.168.59.103 left intact

How should I do in this case? I want to use this to show some docker information and do something to docker using java code. more java exception detail is:

Exception in thread "main" javax.ws.rs.ProcessingException: org.apache.http.client.ClientProtocolException
    at org.glassfish.jersey.apache.connector.ApacheConnector.apply(ApacheConnector.java:513)
    at org.glassfish.jersey.client.ClientRuntime.invoke(ClientRuntime.java:246)
    at org.glassfish.jersey.client.JerseyInvocation$2.call(JerseyInvocation.java:683)
    at org.glassfish.jersey.internal.Errors.process(Errors.java:315)
    at org.glassfish.jersey.internal.Errors.process(Errors.java:297)
    at org.glassfish.jersey.internal.Errors.process(Errors.java:228)
    at org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:424)
    at org.glassfish.jersey.client.JerseyInvocation.invoke(JerseyInvocation.java:679)
    at org.glassfish.jersey.client.JerseyInvocation$Builder.method(JerseyInvocation.java:408)
    at org.glassfish.jersey.client.JerseyInvocation$Builder.get(JerseyInvocation.java:308)
    at com.github.dockerjava.jaxrs.InfoCmdExec.execute(InfoCmdExec.java:26)
    at com.github.dockerjava.jaxrs.InfoCmdExec.execute(InfoCmdExec.java:12)
    at com.github.dockerjava.jaxrs.AbstrDockerCmdExec.exec(AbstrDockerCmdExec.java:57)
    at com.github.dockerjava.core.command.AbstrDockerCmd.exec(AbstrDockerCmd.java:29)
    at org.v11.dm.docker.Demo.main(Demo.java:15)
Caused by: org.apache.http.client.ClientProtocolException
    at org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java:188)
    at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:72)
    at org.glassfish.jersey.apache.connector.ApacheConnector.apply(ApacheConnector.java:465)
    ... 14 more
Caused by: org.apache.http.ProtocolException: The server failed to respond with a valid HTTP response
    at org.apache.http.impl.conn.DefaultHttpResponseParser.parseHead(DefaultHttpResponseParser.java:151)
    at org.apache.http.impl.conn.DefaultHttpResponseParser.parseHead(DefaultHttpResponseParser.java:57)
    at org.apache.http.impl.io.AbstractMessageParser.parse(AbstractMessageParser.java:260)
    at org.apache.http.impl.DefaultBHttpClientConnection.receiveResponseHeader(DefaultBHttpClientConnection.java:161)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:497)
    at org.apache.http.impl.conn.CPoolProxy.invoke(CPoolProxy.java:138)
    at com.sun.proxy.$Proxy19.receiveResponseHeader(Unknown Source)
    at org.apache.http.protocol.HttpRequestExecutor.doReceiveResponse(HttpRequestExecutor.java:271)
    at org.apache.http.protocol.HttpRequestExecutor.execute(HttpRequestExecutor.java:123)
    at org.apache.http.impl.execchain.MainClientExec.execute(MainClientExec.java:253)
    at org.apache.http.impl.execchain.ProtocolExec.execute(ProtocolExec.java:194)
    at org.apache.http.impl.execchain.RetryExec.execute(RetryExec.java:85)
    at org.apache.http.impl.execchain.RedirectExec.execute(RedirectExec.java:108)
    at org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java:186)
    ... 16 more

回答1:

Your code worked for me.

I have following setup -

Docker daemon is running with this command -

/usr/bin/docker -d -H fd:// -H tcp://0.0.0.0:2375
I am able to curl -

curl http://localhost:2375/info
Also able to run your code.

NOTE

If you are using boot2docker, please check how daemon is running and is it accepting http request. If it's running with TLSVerify please stop it and run as i mentioned in 1st step.

来源：https://stackoverflow.com/questions/31201846/how-to-use-docker-java-api-to-connect-docker

标签

java

Docker

boot2docker