Mahesh Chandra

“Failures are the stepping stones to success”.

“Dream it. Wish it. Do it.”

Dream big, have a wish for it. No matter what happens just do it. And do it today.

The below are some of the commonly used docker commands. These commands helps to get started for working with docker images and containers.

docker stop $(docker ps -a -q) (Stops all containers)

docker rm $(docker ps -a -q) (Removes all containers)

docker ps -a (Lists all containers)

docker images (Lists all images)

docker images -a (Lists all dangling images)

docker images -a | awk '{print $3}' | xargs docker rmi --force (Removes all images including dangling images)

docker image rm <image_id> (Removes the image, use --force to force remove)

docker logs <container_id> (To see logs of a container)

docker logs --follow <container_id> (Tails the logs)

Streams in Java 8 provide a convenient way to loop through a collection of objects. The following are the few examples on their usage. 

Filter

List<Employee> adminEmployees = employees.stream()                .filter(employee -> employee.getDepartment().equals("ADMIN"))                .collect(Collectors.toList());

All Match

boolean areAllActive = employees.stream()                .filter(employee -> employee.getDepartment().equals("ADMIN"))                .allMatch(Employee::isActive);

Any Match

boolean hasAnyActiveEmployee = employees.stream()                .anyMatch(Employee::isActive);

None Match