niketa agarwal – Best DevOps

Docker Image

niketa agarwal — Tue, 17 Aug 2021 07:32:11 +0000

It is a record of a Docker container at a specific point in time.

A Docker image has many layers, and each image includes everything needed to configure a container environment — system libraries, tools, dependencies and other files.

Docker images also act as the starting point when using Docker

docker wait

niketa agarwal — Tue, 17 Aug 2021 05:35:52 +0000

blocks container and when container is stop ,it prints their exit code

[root@ip-172-31-4-255 centos]# docker run -dit –name=my_container ubuntu bash
dcd196da19b9c9b356597efa55b442fe0479f7c4f66d6dcf6745fab0995a64eb
[root@ip-172-31-4-255 centos]# docker wait my_container

in duplicated terminal

[root@ip-172-31-4-255 centos]# docker stop my_container
my_container

in previous terminal

[root@ip-172-31-4-255 centos]# docker wait my_container
0

Assignment Day -2

niketa agarwal — Tue, 17 Aug 2021 05:31:21 +0000

docker update

docker update docker configuration in runtime

docker update --cpu-shares 512 dockerID

            "Isolation": "",
            "CpuShares": 512,
            "Memory": 0,

Assignment Day 1 -Niketa Agarwal

niketa agarwal — Mon, 16 Aug 2021 10:09:26 +0000

Difference between docker kill and docker stop

docker kill process with sigkill signal while docker stop process with sigterm signal

Assignment day 1 -Niketa Agarwal

niketa agarwal — Mon, 16 Aug 2021 10:04:57 +0000

Unpause and pause

Pause command works as it will suspends all process in a container without process knowing in it suspended and later they can be resumed ,they as able to do this with the help of cgroup freezer

UnPause will make process to resume from thier last activity