Debug School: Prashant C

Devops Day2 -1

Prashant C — Tue, 15 Nov 2022 04:52:50 +0000

What is the use of "docker update"?
--The docker update command dynamically updates container configuration. You can use this command to prevent containers from consuming too many resources from their Docker host. With a single command, you can place limits on a single container or on many.

What is the use of "docker wait"?
--The 'docker wait' is a command that is used to wait or block until one or more containers stop, and then it outputs their exit codes which means you cannot use your terminal if you are running the command on the terminal.

Docker Assessment 2

Prashant C — Mon, 14 Nov 2022 10:06:02 +0000

what is the diff between docker pause and docker unpause
The docker pause command suspends all processes in the specified containers. We can apply this command , if the container is in running state
we can verify this by using docker stats, we can see that cup usage goes to zero when we do docker pause.
The docker unpause command un-suspends all processes in the specified containers. We can apply this command , if the container is in pause state

What is the diff between docker stop and docker kill
docker stop: Stop a running container (send SIGTERM, and then SIGKILL after grace period). The main process inside the container will receive SIGTERM, and after a grace period, SIGKILL.

docker kill: Kill a running container (send SIGKILL, or specified signal) .The main process inside the container will be sent SIGKILL, or any signal specified with option --signal. [emphasis mine]signal). The main process inside the container will be sent SIGKILL, or any signal specified with option --signal. [emphasis mine]

Docker Understandings

Prashant C — Mon, 14 Nov 2022 07:07:21 +0000

Write a notes on following with your learning with last session
What is Docker?

Docker is a container management tool which facilitates resource isolation at kernel level by creating separate root level user by creating 1PID tree, 1NW FS, 1RootFS, 1Boot FS Why Docker?
We are using Docker to create containers which can help us save time, cost etc. What is Container
Each of unique user group with isolated resources is a container. Docker workflow
Human -> Docker client -> Docker Server -> Container Dependencies -> Kernel. How container created?