Docker Pull and Inspect

Find the Ports in Docker Image

Before writing any manifests, pull the images and inspect them to find the exposed ports:

docker pull dockersamples/examplevotingapp_vote:before
docker inspect dockersamples/examplevotingapp_vote:before | python3 -m json.tool | grep -A5 ExposedPorts

"ExposedPorts": {
    "80/tcp": {}
}

docker inspect redis:latest | python3 -m json.tool | grep -A5 ExposedPorts

"ExposedPorts": {
    "6379/tcp": {}
}

docker inspect postgres:9.4 | python3 -m json.tool | grep -A5 ExposedPorts

"ExposedPorts": {
    "5432/tcp": {}
}