Debug School: Nityanand kumar

Write a Notes on all the git commands which we have learned and one line explaination of it.

Nityanand kumar — Fri, 18 Nov 2022 07:28:25 +0000

git init:- initializes the git in the folder
git config :- used to config the git user name and email associated
git add file1.txt :- Add file1.txt to
git add . :- Adds a file to the staging area.
git commit -m "commit message" :- Records or snapshots the file permanently in the version history.
git push origin master :-
git pull :-
git branch :- lists all the local branches in the current repository.
git checkout :- This command is used to switch from one branch to another.
git merge :- command merges the specified branch’s history into the current branch.
git clean :- used to remove unwanted files from your working directory
git clone URL:- For getting a repository from an existing URL
git log :- used to list the version history for the current branch
git status :- lists all the files that have to be committed.

How can we store container data in memory using docker volume

Nityanand kumar — Wed, 16 Nov 2022 05:24:54 +0000

Volumes are used to share files between the host machine and container so that we can have persist data even after the container is stopped.

We can use the mount by using --mount type=tmpfs,destination=/app. To create tmpfs mounts, we don’t have to create a file structure in our host file system. We can mention only the destination file path and it will create the directory structure on its own.

What is a Docker image ?

Nityanand kumar — Tue, 15 Nov 2022 06:45:35 +0000

Docker image is a combination of a file system and parameters like: RootFS + Java+ Tomcat + Apache
--Storage driver used in Docker is overlays2 (present inside the root directory)
Some of the command are:
_du -sh
du -kh
docker images: list of Docker images on the system
docker pull httpd
_

Docker Commands:

Nityanand kumar — Tue, 15 Nov 2022 04:43:30 +0000

1) What is the use of "docker update"? Hint - docker run --help
Answer: It update the configuration of one or more containers. We can look for different options available.

2)What is the use of "docker wait"?
Answer: "docker wait" is used to wait or block until one or more containers stop, and then it outputs their exit codes.
Example: We start a container in the background and then use the command docker wait which should block until the container exits.

14th November Assignment

Nityanand kumar — Mon, 14 Nov 2022 10:10:20 +0000

1) what is the diff between docker pause and docker unpause

Answer: Pause suspends all processes of the selected container while unpause resumes the containers.

2) What is the diff between docker stop and docker kill
Answer: Kill command(send SIGKILL) kills whereas stop command(send SIGTERM) is used to stopping the running container.

Summary of Docker Introduction

Nityanand kumar — Mon, 14 Nov 2022 07:20:57 +0000

1)What is Docker ?
----Docker is a container management tool which can save cost, save time and improve the quality of software also.

2) Basically what a Docker can do ?
----It can create/ start/ stop/ and remove the container.

3) Different components of the Docker:
Docker Engine, Images, Containers, Registries & Repositories.

4) What is Kernel ?
----Kernel is the sub-part of the Operating system. Some of the functions are mentioned below:
a)Process management
b)File management
c)Network management

5) Different components of Linux Kernel-
---- cgroups, namespaces, capabilities, etc.

6)Learned about the distinction between Physical Machine ----Virtual Machine and Container.

7) Also about the motivation of need to have a container over the personal computer- Like 3 Apache servers cannot run on single PC using the same port number.