The screencast of the last steps is attached.
Properties and settings of the cdk haven't been changed. Everything is dowloaded and installed in a usual way.
Possibly something is with the dns - maybe it wasn't configured correctly while cdk installation. Because we to push to the valid url, while OS connection only an IP in its settings.
exception:
org.eclipse.linuxtools.docker.core.DockerException: com.spotify.docker.client.DockerException: org.eclipse.linuxtools.docker.core.DockerImagePushFailedException: Image push failed: hub.openshift.rhel-cdk.10.1.2.2.xip.io/sample-project/aloha: unable to ping registry endpoint https://hub.openshift.rhel-cdk.10.1.2.2.xip.io/v0/
v2 ping attempt failed with error: Get https://hub.openshift.rhel-cdk.10.1.2.2.xip.io/v2/: dial tcp 10.1.2.2:443: connection refused
v1 ping attempt failed with error: Get https://hub.openshift.rhel-cdk.10.1.2.2.xip.io/v1/_ping: dial tcp 10.1.2.2:443: connection refused
at org.eclipse.linuxtools.internal.docker.core.DockerConnection.pushImage(DockerConnection.java:1047)
at org.jboss.tools.openshift.internal.ui.dockerutils.PushImageToRegistryJob.doRun(PushImageToRegistryJob.java:67)
at org.jboss.tools.openshift.internal.common.core.job.AbstractDelegatingMonitorJob.run(AbstractDelegatingMonitorJob.java:37)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55)
Caused by: com.spotify.docker.client.DockerException: org.eclipse.linuxtools.docker.core.DockerImagePushFailedException: Image push failed: hub.openshift.rhel-cdk.10.1.2.2.xip.io/sample-project/aloha: unable to ping registry endpoint https://hub.openshift.rhel-cdk.10.1.2.2.xip.io/v0/
v2 ping attempt failed with error: Get https://hub.openshift.rhel-cdk.10.1.2.2.xip.io/v2/: dial tcp 10.1.2.2:443: connection refused
v1 ping attempt failed with error: Get https://hub.openshift.rhel-cdk.10.1.2.2.xip.io/v1/_ping: dial tcp 10.1.2.2:443: connection refused
at org.eclipse.linuxtools.internal.docker.core.DockerProgressHandler.progress(DockerProgressHandler.java:42)
at com.spotify.docker.client.ProgressStream.tail(ProgressStream.java:74)
at com.spotify.docker.client.DefaultDockerClient.push(DefaultDockerClient.java:821)
at org.eclipse.linuxtools.internal.docker.core.DockerConnection.pushImage(DockerConnection.java:1043)
... 3 more
Caused by: org.eclipse.linuxtools.docker.core.DockerImagePushFailedException: Image push failed: hub.openshift.rhel-cdk.10.1.2.2.xip.io/sample-project/aloha: unable to ping registry endpoint https://hub.openshift.rhel-cdk.10.1.2.2.xip.io/v0/
v2 ping attempt failed with error: Get https://hub.openshift.rhel-cdk.10.1.2.2.xip.io/v2/: dial tcp 10.1.2.2:443: connection refused
v1 ping attempt failed with error: Get https://hub.openshift.rhel-cdk.10.1.2.2.xip.io/v1/_ping: dial tcp 10.1.2.2:443: connection refused
at org.eclipse.linuxtools.internal.docker.ui.views.ImagePushProgressHandler.processMessage(ImagePushProgressHandler.java:49)
at org.eclipse.linuxtools.internal.docker.core.DockerProgressHandler.progress(DockerProgressHandler.java:40)
... 6 more