How to start a docker container using fabric8 java docker client

[Kasun de Silva]

Hi, I need to do the $subject.

Do you guys point me to any examples?

At the moment I was able to do docker pull, docker push, tag and build operations[1].

I want to start a docker container can you guys point me to any samples.

[1] https://github.com/fabric8io/docker-client/tree/master/examples/src/main/java/io/fabric8/docker/examples

Thanks,

Kasun

[Kasun de Silva]

I tried following but no luck,

ContainerCreateResponse containerCreateResponse = dockerClient.container().createNew()
        .withImage(imageRepoUrl + ":" + imageTag)
        .done();

Can someone provide an example? 

[Kurt Stam]

Hi Kasun, are you executing this code inside a docker container? I'm asking because only 'privileged' docker containers can start other containers, and this brings about sone security issues. It's therefor discouraged to do so. If possible you should solve your problem another way.

cheers,

--Kurt

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[Kasun de Silva]

Hi Kurt,

Thanks for your response. No I'm not executing this code inside a docker container. I just want to execute docker api for run a docker image from and existing image. 

Following is a working example of a docker push I have written using fabric8 client. I need to do the same for docker run. Can you guys point me to an example?

public void pullDockerImage(String imageRepoUrl, String imageTag) throws AppCloudException {

    if (log.isDebugEnabled()) {
        log.debug("Docker image pull triggered for repo : " + imageRepoUrl + " with tag : " + imageTag);
    }

    final boolean[] dockerStatusCheck = new boolean[1];
    dockerStatusCheck[0] = false;
    try {
        handle = dockerClient.image().withName(imageRepoUrl).pull()
                             .usingListener(new EventListener() {
                                 @Override
                                 public void onSuccess(String message) {
                                     log.info("Pull Success:" + message);
                                     pullDone.countDown();
                                     dockerStatusCheck[0] = true;

                                 }

                                 @Override
                                 public void onError(String message) {
                                     log.error("Pull Failure:" + message);
                                     pullDone.countDown();
                                 }

                                 @Override
                                 public void onEvent(String event) {
                                     log.info(event);
                                 }
                             }).withTag(imageTag).fromRegistry();
        pullDone.await();

    } catch (InterruptedException e) {

        String msg = "Error occurred while pulling docker image " + imageRepoUrl + " with tag : " + imageTag;
        throw new AppCloudException(msg, e);
    } finally {
        try {
            handle.close();
        } catch (IOException e) {
            log.warn("Error occurred while closing output handle after pulling docker image " + imageRepoUrl +
                     " with tag : " + imageTag);
        }

--

Kasun de Silva

[James Strachan]

the fabric8 project uses kubernetes; so it doesn't usually run docker containers directly from Java code - as thats what kubernetes does for you.

You could noodle the docker-maven-plugin codebase which is pure docker

https://github.com/fabric8io/docker-maven-plugin/blob/master/src/main/java/io/fabric8/maven/docker/StartMojo.java#L240

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[Kasun de Silva]

I have seen this,

https://github.com/fabric8io/docker-client/tree/master/examples/src/main/java/io/fabric8/docker/examples

I gives the capability to invoke docker api direclty correct me if I'm wrong but thats how I understood it. 

Thanks,
Kasun

--

Kasun de Silva

Senior Software Engineer | Cloud TG

WSO2 Inc. | Email : kas...@wso2.com | Mobile: +94 77 794 4260

[Kasun de Silva]

Basically I need to execute these two api calls through fabric8 docker cient.  

curl -v -X POST -H "Content-Type: application/json" -d '{"Image": "tomcat:latest"}' http://localhost:2375/containers/create?name=hello

curl -v -X POST -H "Content-Type: application/json" -d http://localhost:2375/containers/hello/start?name=hello

Can you guys provide any sample code ?

[James Strachan]

the code I gave you is the only code I know of (which doesn't use the docker-client)

[Ioannis Canellos]

Hi Kasun,

I found a regression in the client which broke the create() operation. I fixed that and also added an full example that you will find handy: https://github.com/fabric8io/docker-client/pull/70/commits/4ae55decc91af9aa045f33b7032c64b5980cf39d

I'll cut a new release later today.

--

Ioannis Canellos

Blog: http://iocanel.blogspot.com

Twitter: iocanel

[Kasun de Silva]

Thanks alot Ioannis!

Appreciate it.

[Kasun de Silva]

Please let me know the working client version once you release.

Thanks,

Kasun