Multiple tags are allowed: docker build -t whenry/fedora-jboss:latest -t whenry/fedora-jboss:v2.1 . U can leave without a tag, :latest by default: docker build -t whenry/fedora-jboss -t whenry/fedora-jboss:v2.1 .
docker build -t whenry/fedora-jboss:latest -t whenry/fedora-jboss:v2.1 .
docker build -t whenry/fedora-jboss -t whenry/fedora-jboss:v2.1 .