Docker solves software packages dependency problem to some extent. Containers include the application and all of its dependencies – but share the kernel with other containers, thereby have much smaller footprint than virtual machines.
After installation (depends on platform),
# downloads from docker hub and runs it docker run hello-world # shows all docker images (filesystems) docker ps -a # get CentOS image docker pull centos:7 # Ubuntu image download and gain root shell docker run -t -i ubuntu /bin/bash
Some use cases are described in docker compose.