Pushing images to docker registry using docker-client api

问题

While exploring docker-client api (java) what certificates are exactly required for setting up connection to the docker daemon running on a vm.

The code which I found online :

{
// Create a client based on DOCKER_HOST and DOCKER_CERT_PATH env vars
final DockerClient docker = DefaultDockerClient.fromEnv().build();

// Pull an image
docker.pull("busybox");

}

The link to above example is available at : https://github.com/spotify/docker-client

What I intend to do is access docker-daemon running on my master node(deployed through magnum api) and push my java applications docker-image onto the registry so that I can create pods on my cluster using these images.

I am not sure what more needs to be done as I am new to this.

回答1:

I did something similar, created images on a remote docker daemon and pushed it to a repository and further spawned containers. I used docker-java client and it works fine. You might want to go through their wiki, the issues page as usual proved to be very helpful for me.

Basic Steps:

Basically you need to create a DockerClientConfig which is
something like:

public DockerClientConfig dockerClientConfig() {
   return DefaultDockerClientConfig.createDefaultConfigBuilder()
       .withDockerHost("IP_where_docker_daemon_is_running_with_port")
       .withDockerTlsVerify("Transport_Layer_Security_accepts_Boolean")
       .withDockerCertPath("If_tls_is_true")
       .build();
}

Then you need to create a DockerClient

public DockerClient dockerClient() {
    DockerClient dockerClient = DockerClientBuilder.getInstance(dockerClientConfig())
        .withDockerCmdExecFactory(nettyDockerCmdExecFactory())
        .build();
    return dockerClient;
}

Now you're ready to make calls to create Image, push Image, startContainer etc.

   File baseDir = new File(appImage.getSourceUri());

    BuildImageResultCallback callback = new BuildImageResultCallback(){
        @Override
        public void onNext(BuildResponseItem item){
            System.out.println("It's done - > " + item);
            super.onNext(item);
        }
    };

    PushImageResultCallback pushImageResultCallback = new PushImageResultCallback(){
        @Override
        public void onNext(PushResponseItem item){
            System.out.println("It's done too - >" + item);
            super.onNext(item);
        }
    };


    dockerClient.buildImageCmd(baseDir).withTag(appImage.getRegistryEndpoint()+"/apps/test:" + appImage
                           .getName()).exec(callback).awaitImageId();

    dockerClient.listImagesCmd().withShowAll(true).exec();

    AuthConfig authConfig = new AuthConfig().withUsername("admin").withPassword("admin")
                                            .withRegistryAddress("http://some_ip/v2/");

    dockerClient.pushImageCmd(appImage.getName())
                .withAuthConfig(authConfig)
                .withName(appImage
                .getRegistryEndpoint()+ "/apps/test")
                .withTag(appImage.getName())
                .exec(pushImageResultCallback).awaitSuccess();

    CreateContainerResponse containerResponse = dockerClient.createContainerCmd(appImage
        .getRegistryEndpoint()+ "/apps/test:" + appImage.getName())
        .exec();

    dockerClient.startContainerCmd(containerResponse.getId()).exec();

That should be enough to get you started.

回答2:

Perhaps that you could also simply use Jib core APIs which is a simple Java library that doesn't need any docker installed to build + push an image!

Read this Google blog post to know more about it.

来源：https://stackoverflow.com/questions/44624805/pushing-images-to-docker-registry-using-docker-client-api

标签

java

docker-registry

spotify-docker-client