Docker 8

 Read the previous articles.

In the previous article, i have committed my changes . So now i want to login and check . In the previous i have created login credentials in the https://hub.docker.com/ 

To make it  visible to the public

Revise the previous articles 

1 step : pull the image

docker pull redis

2 step

Run the below command

docker run  -it redis bash

Step 3

docker exec -it redis123 bash

Let me go inside that directory and create a sample text and save with sample.txt name

Step 4:

root@befffa2a3fd7:/data# mkdir demo123

Step 5

Step 6

echo "test container">sample.txt

Next step is we need to run the exit command.

Now, the above commit will be saved in the docker images

Next step in login to docker hub by running the below command

Now, we need to push the changes to the docker hub of your login. So that you will be able to see your changes in the hub.

Make that as public

Now, i am going to delete the container

Now, let me delete all the images 

Now, i am pulling that image from hub by using the below command

docker run -idt --name testabc uday9287/redis:1.0

Docker 7

 Please read the previous articles related to azure 

From the above image , you can see the list of images complete details inside that

Now, i want to list out all the container details

Now, from the above screenshot you can compare the ids.

You can forcefully delete the container instead of stopping it. By using the below command

docker rm -f containerId or Name

Committing Changes to Docker

Running a Container

Running of containers is managed with the Docker run command. To run a container in an interactive mode, first launch the Docker container.

Syntax:    sudo docker run –it centos /bin/bash 

Now, let us exec the command using bash

docker exec -it test123 bash

From the above image you can see once you have runned the command, It has changed the root ip to the container id.

Type ls command to list the files inside it

Let me run the below command to create a directory inside that

root@83059965016c:/# mkdir demo123

Let me go inside that directory and create a sample text and save with sample.txt name

root@83059965016c:/demo123# echo "This is my tes file">sample.txt

root@83059965016c:/demo123# ls

root@83059965016c:/demo123# exit

Now, if i click on exit i am going to come back again to root folder. 

Now, i want to commit this changes

Still am changes are in the temp memory. That is not permanent.  Now let us go back to AWS Account and check.

Now, we need to give read and write permissions to that file first. We can also install package as well.

Try to install apache2 by running the below command

 apt install apache2 -y

Try to install git by running the below command 

To check if the git is installed, use the below command

root@83059965016c:/# git -v

git version 2.39.2

We can also go inside the folder  by using the below commands

root@83059965016c:/# ls/usr/share/

Finally exit the command n then use commit command

docker commit containerid or name

The above  commit will be saved in the docker images.

if we check

Few more Commands

docker images -q

This command is used to return only the Image ID’s of the images.

docker inspect

This command is used see the details of an image or container.

Syntax

docker inspect imagename

docker history

With this command, you can see all the commands that were run with an image via a container.

docker history ImageID 

docker stop
This command is used to stop a running container.
Syntax
docker stop ContainerID 
docker rm
This command is used to delete a container.
Syntax
docker rm ContainerID 
docker stats
This command is used to provide the statistics of a running container.
docker stats ContainerID
docker pause
This command is used to pause the processes in a running container.
docker pause ContainerID 



docker unpause
This command is used to unpause the processes in a running container.



docker kill
This command is used to kill the processes in a running container.
docker kill ContainerID



Docker – Container Lifecycle
The following illustration explains the entire lifecycle of a Docker container.
Initially, the Docker container will be in the created state.
Then the Docker container goes into the running state when the Docker run command is used.
The Docker kill command is used to kill an existing Docker container.
The Docker pause command is used to pause an existing Docker container.
The Docker stop command is used to pause an existing Docker container.
The Docker run command is used to put a container back from a stopped state to a running state

docker container prune:
This is the command, which will delete all the exited containers.

What is difference between docker run and docker start?
Docker start command is used to start any stopped container. Docker run command is a combination of creating and start as it creates a new container and starts it immediately.


What is difference between docker attach and Docker exec?
This is basically the major difference between exec and attach. When you run an exec, it will basically spins up a new process inside the container whereas attach basically lets you attach to an existing process inside the container

Differences Between Docker Run and Docker Exec

The docker run command creates and starts a new container from an image, while the docker exec command interacts with an already running container

Example of Docker Attach