🌠 Docker Lifecycle interview question

Описание: Day 4 | Docker Lifecycle | Important Docker interview question and answer | Free Docker Tutorials

In this video i had covered below points

✔️ Explain Docker Lifecycle
✔️ How to create docker containers
✔️ How to run docker containers
✔️ How to pause docker containers
✔️ How to unpause docker containers
✔️ How to kill or delete docker containers
✔️ How to start docker containers
✔️ How to delete running containers
✔️ How to check docker images
✔️ How to check running docker containers
✔️ How to check docker container states

1. Created State:
A container enters the "created" state after being initialized from a Docker image using the docker create command.
In this state, the container exists on the system, but its processes are not yet running.
2. Running State:
The container transitions to the "running" state when docker start is executed on a created container or when docker run (which combines creation and starting) is used.
In this state, the container's main process and any other specified commands are actively executing.
3. Paused State:
A running container can be temporarily suspended using docker pause.
This state halts all processes within the container without terminating them, allowing for later resumption.
4. Unpaused State:
A paused container can be resumed with docker unpause, returning it to the "running" state and allowing its processes to continue execution.
5. Stopped (Exited) State:
A running container enters the "stopped" or "exited" state when its main process completes or when explicitly stopped using docker stop.
docker stop attempts a graceful shutdown, sending a signal to the container's main process. If it doesn't shut down within a timeout, Docker sends a kill signal.
6. Killed State:
A running container can be forcefully terminated using docker kill.
This command immediately sends a kill signal to the container's main process, bypassing graceful shutdown procedures.
7. Deleted State:
Containers, whether in a created or stopped state, can be permanently removed from the system using docker rm.
docker rm will only remove stopped containers by default; the -f flag is required to force removal of a running container.


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