DEV Community: Kamrul Hasan

Check Docker Installation Details- Part 4

Kamrul Hasan — Sun, 18 May 2025 05:19:30 +0000

Troubleshooting Common Docker Issues

Issue: Docker Daemon Not Running

If you attempt to run a Docker command and encounter an error such as:
Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?

This indicates that the Docker daemon isn't running. To fix this:

1.Verify the status of the Docker service by running:

# systemctl status docker

2.If it's not running, start the Docker service with the following command:

# systemctl start docker

3.If the service fails to start, examine the logs for error messages using:

# journalctl -u docker

Let’s walk through a simulated scenario of this issue and how to resolve it:

## First, stop the Docker service to simulate the issue

    # systemctl stop docker

## Try to run a Docker command

    # docker ps

## You'll see the "Cannot connect" error
## Now restart the service to fix it

    # systemctl start docker

## Verify Docker is working again

    # docker ps

Issue: Permission Denied

If you encounter an error such as: Got permission denied while trying to connect to the Docker daemon socket.

This typically indicates that your user lacks permission to access the Docker socket. To resolve this, add your user to the docker group:

# usermod -aG docker $USER

After executing this command, you’ll usually need to log out and log back in for the changes to take effect.

Issue: Disk Space Problems

Over time, Docker can use up a considerable amount of disk space due to unused images, containers, and volumes. If you notice your system is low on disk space

1.Inspect Docker's disk usage with:

# docker system df

2.Remove unused resources:

## Remove all stopped containers
    # docker container prune

## Remove all unused images
    # docker image prune

## Remove all unused volumes
    # docker volume prune

## Or remove everything unused in one command
    # docker system prune

Let's walk through how to use the pruning command:

## Create some containers that will exit immediately
    # docker run hello-world
    # docker run ubuntu echo "This will exit immediately"

## Now prune stopped containers
    # docker container prune

You'll be asked to confirm the operation:
WARNING! This will remove all stopped containers. Are you sure you want to continue? [y/N] y
Type y to confirm. You should see output showing the removed containers.

Issue: Container Not Starting

If a container fails to start, you can investigate by checking its logs:

## First, try to start a container that might fail
    # docker run --name failing-container ubuntu apt-get update

## Check the logs
    # docker logs failing-container
You might see errors in the logs that indicate why the container failed.

Issue: Network Problems

If containers are unable to communicate with one another or with external networks:
1.Inspect Docker’s network settings:

# docker network ls

2.Inspect a specific network:

# docker network inspect bridge

## 3.Test connectivity from within a container:

## Start a container with networking
    # docker run -it ubuntu bash
## From inside the container, install ping
    # apt-get update && apt-get install -y iputils-ping
## Try pinging a website
    # ping google.com
## Exit the container
    # exit

Docker Logs and Debugging

For overall Docker troubleshooting, reviewing the Docker daemon logs can provide valuable insights:

# journalctl -u docker

For a specific container's logs:

# docker logs <container_id>

You can also get a real-time stream of logs:

# docker logs -f <container_id>

These troubleshooting steps can help you identify and fix most common Docker problems.

Md. Kamrul Hasan

https://linkedin.com/in/kamrul-dev
https://github.com/kamrul-dev

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How to install CentOS in Virtual Box

Kamrul Hasan — Wed, 14 May 2025 06:40:19 +0000

CentOS Installation on Virtual Box

1.Download Virtual Box and install it on you Host Operating System:

https://www.virtualbox.org/wiki/Downloads

2.Open the Virtual Box and click “New” button.

3.Fill up the fields and click “Next” Button

• Name: For identifying your OS, put the name which OS you are installing.
• Folder: In this filed refers to where you install the OS system files
• ISO Image: Refers to select .iso image from your computer.
• Skip the Unattended Installation

4.In this section provide the Base Memory (RAM) and Processors then click “Next” button.

5.In this section provide the storage for the installation and click “Next” button.

6.You will find the total system configuration summary then “Finish” button.

7.Select the centos and click on the “Start” button.

8.An installation window will be open, and it will automatically select “Install CentOS Stream 9” and press “Enter” It will start booting the system.

9.Select Language and press “Continue” button.

10.Installation summary page will be opened. And click on Root Password option.

11.Provide the root password and default username will be root. click on the “Done” button.

12.Click on the User Creation option for create a user.

13.Fill up the fields such as Full name, Username, Password and click on “Done” button.

14.Now set up the automatic storage disk. Click on the “Installation Destination”.

15.Select the and check mark the “Local Standard Disks”, radio button will be automatic. And finally click on “Done” button.

16.Now click on the “Begin Installation” button.

17.Installation process will start, and I will take some time according to your pc configurations. Keep patience and wait until this part is completed.

18.After Installation process complete click on the “Reboot System” button.

19.Finally, you will get the login page for entering the centos system. Click on the Name Shown on the screen.

20.Type passwordwhich you already created for this user.

21.Now click on No Thanks or You can Take Tour.

22.You will get the final window for the CentOS. Click Activities and then click Terminal Icon.

23.Now you can update your system by following the steps below on the screenshot. You can directly update as root user. Here you can see steps to update your system as a normal user.

Let apply this command:

`- sudo dnf update

su – root
usermod -aG wheel mrk
su – mrk
sudo dnf update`

Md. Kamrul Hasan

LinkedIn: https://linkedin.com/in/kamrul-dev
GitHub: https://github.com/kamrul-dev

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Check Docker Installation Details Part - 3

Kamrul Hasan — Sun, 11 May 2025 01:30:08 +0000

Exploring Basic Docker Commands

Now that we've verified our Docker installation works correctly (Part-2), let's explore some basic Docker commands that will help you manage containers and images.

Running an Interactive Container

Unlike the hello-world container that runs and exits immediately, we can run containers interactively.

1.Let's run an Ubuntu container and interact with its shell:

docker run -it ubuntu bash

This command:
• -i keeps STDIN open
• -t allocates a pseudo-TTY (terminal)
• ubuntu is the image name.
• bash is the command to run inside the container.

Once the container starts, you'll be at a bash prompt inside the container. The prompt shows you're logged in as root in the container. The alphanumeric string is the container ID.

2.Try running some Linux commands inside the container:

cat /etc/os-release

This will display information about the Ubuntu version running in the container:

3.When you're done exploring, exit the container by typing:

exit

This will return you to your host terminal.

Container Lifecycle Management

4.Let's explore how to manage the lifecycle of a container. First, we'll start a container in detached mode:

docker run -d --name web nginx

This command:
• -d runs the container in detached mode (in the background)
• --name web assigns the name "web" to the container
• nginx is the image to use.

You'll see a long container ID printed on the screen.

5.Now, let's check that the container is running:

docker ps

You should see the nginx container running.

6.To stop the container:

docker stop web

7.Verify it's stopped:

docker ps

8.The container should no longer appear in the list of running containers. To see all containers including stopped ones:

docker ps -a

You should the nginx containers in the stopped state.

9.To start the container again and check container status:

docker start web

docker ps

10.to remove a container when you no longer need it:

docker rm web

11.Error response from daemon: cannot remove container "/web": container is running stop the container before removing. First stop the running container then remove and check:

docker stop web

docker rm web

Command: docker ps -a

You should see the web container not available.

Managing Docker Images

Let's explore how to manage Docker images. To list all images:
12.Let’s check the docker images available of your system.

docker images

You should see at least the hello-world and nginx images.

13.To remove an image when you no longer need it:

docker rmi hello-world

Error response from daemon: conflict: unable to remove repository reference "hello-world" (must force) - container be8b92819418 is using its referenced image 74cc54e27dc4.
Note that you can't remove images that are being used by containers (even stopped ones). You'll need to remove those containers first.

14.Let’s remove the hello-world container then remove hello-world image:

Command:docker ps -a

Command: docker rmi hello-world

Command: docker images

You should see the hello-world image not available in the images list.

Docker System Information

To check disk space used by Docker (containers, images, volumes):

15.Let’s check disk space used by docker:

docker system df

This will show a summary of disk usage.

16.To get more detailed information:

docker system df -v

This will show a breakdown of each image and container and their sizes.

LinkedIn: https://linkedin.com/in/kamrul-dev
GitHub: https://github.com/kamrul-dev

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Check Docker Installation Details- Part 2

Kamrul Hasan — Wed, 07 May 2025 08:17:09 +0000

Running a Test Container

Now that we've confirmed Docker is installed and running (Part 1), let's test the setup by running a simple container. This will verify that Docker can successfully download images and run containers.

The Hello World Container

Docker offers a lightweight "hello-world" image specifically designed to test Docker installations. This minimal container confirms that:

• The Docker client can connect to the Docker daemon.
• The Docker daemon has access to pull images from Docker Hub.
• Docker can create and launch or run containers.

1.Let's run this test container with the following command:

docker run hello-world

When you run this command for the first time, Docker will:

• Check if the hello-world image exists locally
• If not, download it from Docker Hub
• Create a container from this image
• Start the container, which prints a message and exits

This message confirms that your Docker installation is working correctly.

Listing Containers

After running the hello-world container, let's check the list of containers on your system. The container we just ran has already exited, but we can still see it in the list of all containers.

2.To see all containers (including stopped ones), run:

docker ps -a

The -a flag shows all containers, including those that have stopped. Without this flag, docker ps would only show running containers.
Note the STATUS column shows "Exited (0)", which means the container completed its task and exited with a status code of 0 (indicating success).

Listing Docker Images

The hello-world image was downloaded to your local machine. Let's verify this by listing all Docker images:

docker images

This confirms that the hello-world image is stored locally on your system.

LinkedIn: https://linkedin.com/in/kamrul-dev
GitHub: https://github.com/kamrul-dev

Check Docker Installation Details- part 1

Kamrul Hasan — Wed, 07 May 2025 02:46:18 +0000

Checking Docker Version and Status

Introduction
In this tutorial, we will learn how to verify Docker installation and ensure it's working correctly.

1.At first, let's check the version of Docker that's installed on your system. Open a terminal and make sure you are root user and run the following command:

docker –version

2.For more detailed version information, including both the client and server components, use:

docker version

If you receive an error saying "docker: command not found," it indicates that Docker is not installed correctly or not in your PATH.

Check Docker Daemon Status

3.Let's verify that the Docker daemon (service) is running. The Docker daemon is the background service responsible for managing Docker containers.
Run the following command,

systemctl status docker

You should see output indicating that the Docker service is active and running:

Press q for quite this session.

4.If the Docker service is not running, you can start it with:

systemctl start docker

5.To ensure Docker starts automatically when your system boots, you can enable it:

systemctl enable docker

Check Docker Info

6.For a comprehensive overview of your Docker installation, use the docker info command:

docker info

This will display detailed information about your Docker installation, including:
• Container and image counts
• Storage driver
• Docker root directory
• Runtime information
• Network settings
• Registry configuration
The output will be quite extensive but provides valuable information about your Docker setup.

LinkedIn: https://linkedin.com/in/kamrul-dev
GitHub: https://github.com/kamrul-dev

Linux Soft Links and Hard Links

Kamrul Hasan — Sun, 13 Apr 2025 10:29:25 +0000

Linux Soft Links and Hard Links with Practical Examples

In Linux, there are two types of links: soft links (symbolic links) and hard links. Both are used to create shortcuts or references to files and directories, but they behave differently.

1.Soft Link (Symbolic Link)

A soft link, also called a symbolic link, is like a shortcut in Windows. It points to the location of a file or directory. If the original file is deleted, the soft link becomes broken and unusable.

Key Features:

Can link to files and directories.
If the target is removed or renamed, the symbolic link becomes broken.
Does not occupy extra space on the disk except for the link itself.

Creating a Soft Link:

ln -s /path/to/target /path/to/link

Example of Soft Link:
1.Create a file:

echo "This is a test file" > original_file.txt

2.Create a symbolic link to this file:

ln -s original_file.txt soft_link.txt

3.Check the symbolic link:

ls -l

Output:

lrwxrwxrwx 1 user user   15 Aug 22 14:12 soft_link.txt -> original_file.txt
-rw-rw-r-- 1 user user   20 Aug 22 14:11 original_file.txt

4.Access the content through the soft link:

cat soft_link.txt

Breaking the Soft Link:
1.Delete the original file:

rm original_file.txt

2.Try accessing the soft link:

cat soft_link.txt

Output:

cat: soft_link.txt: No such file or directory

The link is broken because the target file is gone.

2.Hard Link

A hard link is a reference to the same inode (data) on disk as the original file. Deleting the original file does not affect the hard link because both links point to the same data.

Key Features:

Can only link to files, not directories.
Both the original file and the hard link share the same inode number.
Even if the original file is deleted, the hard link continues to access the file's content.
Occupies no extra space, both the file and hard link share the same data.

Creating a Hard Link:

ln /path/to/target /path/to/link

Example of Hard Link:
1.Create a file:

echo "This is a test file" > original_file.txt

2.Create a hard link to this file:

ln original_file.txt hard_link.txt

3.Check the hard link:

ls -li

Output:

123456 -rw-rw-r-- 2 user user   20 Aug 22 14:11 hard_link.txt
123456 -rw-rw-r-- 2 user user   20 Aug 22 14:11 original_file.txt

Notice both hard_link.txt and original_file.txt have the same inode number (123456), meaning they are pointing to the same data.

4.Access the content through the hard link:

cat hard_link.txt

Deleting the Original File:
1.Remove the original file:

rm original_file.txt

2.Access the file through the hard link:

cat hard_link.txt

Output:

This is a test file

The hard link still works even though the original file was deleted, because the data remains on the disk until all hard links are removed.

4.Conclusion

Use soft links when you need shortcuts or references across different filesystems, or when you need to link to directories.
Use hard links when you want to create multiple names for the same file that can still work even if one of the links is deleted.

How to Install Docker, Create - Container, Start Container, Stop Container, Delete Container in Ubuntu Server

Kamrul Hasan — Sun, 05 Nov 2023 15:29:36 +0000

In this lab tutorial I tried to show how to Install Docker, Create - Container, Start Container, Stop Container, Delete Container in Ubuntu Server. Follow the steps :

Step 1: For Docker installation, at first you have to write these two commands. I am using ubuntu server 22.04.3 LTS.

sudo apt install docker.io

sudo snap install docker

Step 2: Check if Docker is installed or not. For checking write this command

which docker

Step 3: To see all images present in your local machine. Write this command. What do you see? Nothing ? Yes, you are right. Initially there is no image because you did not create any image.

sudo docker images

Step 4: To find out images in docker hub. Here I want to search for a ubuntu machine. Just write this command to find out all Ubuntu images or other packages. Remember you should write what name is assigned by the docker hub. Here “ubuntu” is named as ubuntu image. You can download this ubuntu image by this command. Any images you can download by this command.

→ Usage: sudo docker pull <image name>

sudo docker pull ubuntu

Step 5: By this command you can create a container with an image,pull the image, run the image inside the container, and get inside the container with interactive bash shell. Here, [run = run the the image inside the container, -it = interactive terminal or bash shell, --name = name of the container (“mycontainer”), ubuntu = image name, /bin/bash = default directory you should add ]

sudo docker run -it --name mycontainer ubuntu /bin/bash

Step 6: If you want to come out from the container you can write this command.

exit

Step 7: Now you can see the docker images by this command. Here you can see the ubuntu image is created.

sudo docker images

Step 8: To check status if the docker service starts or not by this command. You can see the service has already started. After checking the status type “q” for quit.

Service docker status

Step 9: To see only running containers by this command. Here [p = process, s = start] . What do you see? Nothing ? Yes, there is no running container yet.

sudo docker ps

Step 10: Now let's run the container and check running status by this command. You can see the container status is “Up” that means the container is running.

→ Usage: sudo docker start <container name>

    sudo docker start mycontainer
    sudo docker ps

Step 11: You can go inside the container by this command. If you do “ls” then you will see the Linux file system inside the container.

→ Usage: sudo attach <container name>

sudo attach mycontainer

Step 12: Two useful commands. [p = process, s = start, -a = all].

sudo docker ps

{It is used for show only running containers}

sudo docker ps -a

{It is used for show running and also stopped containers at the same time}

Step 13: Stop container

→ Usage: sudo docker stop <container name>

sudo docker stop mycontainer

Step 14: Delete the container. [rm = remove].

→ Usage: sudo docker rm <container name>

sudo docker rm mycontainer

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How to Install Ubuntu Server in Virtual Box

Kamrul Hasan — Sat, 04 Nov 2023 13:54:12 +0000

In this tutorial I tried to show how to Install Ubuntu Server in Virtual Box.

Need Hardware Requirements At Least:

- CPU: 1 gigahertz or better. 
- RAM: 1 gigabyte or more. 
- Disk: a minimum of 2.5 gigabytes.

Step 1: First of all we have to download a virtual box and install it on your computer and download the Ubuntu server version iso file.

⇒ Virtual box download Link: https://www.virtualbox.org/wiki/Downloads

⇒ Ubuntu server Link: https://ubuntu.com/download/server

Step 2: After installing virtual box in your computer then open the virtual box and you will found this window and click “New” to start installation process.

Step 3: You will find this window and fill up the text box. Provide the name of your server in the name section - I provided the name is “ubuntu-server”, Folder is where you want to install the server I select F: drive to install this server, ISO Image is the ubuntu server iso file. Then click the “Next” button.

Step 4: Now fill up the text box such as username, password, hostname, domain name. I provided the username as “kamrul” and host name “localhost”.

Step 5: In the hardware section select your computer RAM(base memory) and Processor. Provide this resource according to your computer configuration . I provided RAM(base memory) as 2GB(2048 MB) and Processors 2 CPU. Now click the “Next” button.

Step 6: In the Virtual Hard disk section. Provide the storage for the ubuntu server. I provided the 30GB storage for this server. Click the “Next” button.

Step 7: You will find the summary page . Here you can see the configuration of what you have done. Click the “Finish” button.

Step 8: For accessing this server from the outside you have to apply the “Bridged Adapter” Rule.
Select ubuntu-server > settings > Network > Adapter 1 > Enable Network Adapter as “Bridged Adapter” > Click OK.

Step 9: Now select ubuntu-server and Click “Start” button. Then it will be started the installation process.

Step 10: You will find the this window and press the enter button on “Try or install ubuntu server” option.

Step 11: Select your comfortable language. I select “English” and press Enter.

Step 12: Select “Continue without updating” by using the arrow key on the keyboard then press Enter.

Step 13: In the “Keyboard configuration” just select “Done” and Press Enter.

Step 14: In the “Choose type of install” - select “Ubuntu Server” by pressing spacebar on your computer then it will be selected and ‘X’ sign will appear inside the parentheses. That means “Ubuntu Server” is selected. Then move down by pressing down arrow key and select the “Done” and press Enter.

Step 15: In “Network connections” - keep as it is and Just select “Done” and press Enter.

Step 16: In “Configure proxy” - keep as it is and select “Done” and press Enter.

Step 17: In ‘Configure Ubuntu archive mirror“ - keep as it is and wait a few seconds for pass the tests then select “Done” and press Enter.

Step 18: In “Guided storage configuration” - move down using the down arrow key and select “Done” and press.

Step 19: In “Storage configuration” - select “Done” and press Enter.

Step 20: Select “Continue” and press Enter.

Step 21: In “Profile setup” - provide your name, your server’s name, pick a username, choose a password then select “Done” and press Enter.

Step 22: In “Upgrade to Ubuntu pro” - select skip now then select “Continue” and press Enter.

Step 23: In “SSH Setup” - Select “Install OpenSSH server” then select “Done” and press Enter.

Step 24: In “Featured Server Snaps” - skip the services and move down and select “Done” and press Enter.

Step 25: Now finally installing the system and it will take some time . keep patience and wait until the “reboot now” button appear on the bottom side.

Step 26: Now the “Reboot Now” button appears and Select it and press Enter. It will take some time to start the machine.

Step 27: Now your ubuntu server is ready to login . Provide the username and password for login into the server.

Step 28: When you are logged in then do some tests . such as create a file and display that file. Following this commands.

→ touch testfile
    → ls

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How to Create EC2 instance for Linux Machine in AWS and How to Access that Machine Through PuTTY.

Kamrul Hasan — Wed, 01 Nov 2023 11:33:09 +0000

How to Create EC2 instance for Linux Machine in AWS and How to Access that Machine Through PuTTY.

In this lab we will explore how to create linux ec2 instances in aws and how to access that machine through putty software and how to terminate the linux machine.

Step1: Go to your AWS Management Console and select a region where you want to create an instance of Windows machine.

Step 2: Now go to the search bar and type EC2 . Then you will find EC2 service and click on it.

Step 3: You will find EC2 Dashboard like this image and click on “Launch instance”. You can also create instances by clicking the “Instance (running)” option.

Step 4: Now you will find the Launch an instance page for filling up necessary information for creating a Linux instance. Follow the below instructions :

⇒ Provide the name of your Linux machine. Here I provided a name as “linux-ec2”.

⇒ Select your desired Linux machine. I selected Amazon Linux and I am using free tier eligible service.

⇒ Select your desired instance type. I selected t2.micro type which is free. You can also take other instance type by clicking “compare instance types”

⇒ Now you have to create a login key pair for login through PuTTY. Click on “Create new key pair”. And you will find a window.

⇒ Provide a key pair name, key pair type RSA and private key file format should .ppk **accessed through **PuTTY. By this key pair you can access your Linux machine through PuTTY. Now click on “Create key pair” and the key pair will be downloaded. The key pair must be saved in a secure place.

⇒ Now Setup your Network settings. Click on the “Edit” button to enable the edit option.

⇒ Now select a VPC . I selected a default VPC (Virtual Private Cloud). Then Select Subnet in your availability zone (or you can create a new subnet). Then Enable “Auto-assign public IP”. Now create a security group or you can use default security group or newly created security group by selecting existing security group option. I created a new security group. Provide a security group name and description as your purpose.

⇒ Now add inbound security group rules. Click on the “Add security group rule” button .

⇒ Now add Inbound Security Group Rules for public access. Add Rules for SSH (port: 22), HTTP(port: 80) and assign source type anywhere so that anyone can send requests and get responses from anywhere via Internet.

⇒ You can configure storage from this storage setting. And There is an Advanced details option for allowing advanced configuration. In this Lab we are not going to set up this advanced feature.

⇒ Now click on “Launch instance”. After that Linux ec2 instance will be created within a few seconds.

⇒ Now click on “View all instances”. After that will be redirected to the instances list page. Where your will find all instances.

⇒ Wait until the status 2/2 checks pass . It means your instance is ready to use.

Step 5: Select “linux-ec2” machine and Click on the right bottom upper sign icon for the details of the ec2 machine.

⇒ Now copy the public ip address for login with PuTTY.

                  **Access Through PuTTY**

Step 6: Go to google and search putty download for windows. And go to www.putty.org then click on “Download PuTTY”.

⇒ Download the putty.exe file according to your computer configuration

⇒ Open putty.exe file by double click.

⇒ your will find this window as like as below image.

⇒ Click on +SSH tab

⇒ Then Click +Auth > Credentials. You will find your computer browsing option. Click on Browse.

⇒ Now upload your ec2 machine’s private key when you downloaded it at the time of creating an ec2 instance. Now Scroll up and find “Session” tab

⇒ Click on “Session” tab and put your ec2 machine’s public IP address (follow step 5 for getting public IP address) and click on “Open”.

⇒ Click on “Accept”.

Step 7: Now will find your ect2 instance Linux machine’s terminal. For login type: ec2-user and press enter.

⇒ Now you are eligible to access Linux ec2 instance of your AWS account

⇒ Create a text file for testing.
→ touch testfile
→ ls

               **Terminate This EC2 Machine**

Step 8: Go to Instances list page and click on “Instance state” and click “Terminate instance”

⇒ Click on Terminate. The Linux ec2 instance machine will be terminated within a few seconds.

                  **Thank You and Pray for me**

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How to create EC2 instance in AWS;
Linux EC2 instance setup on AWS;
Access AWS EC2 Linux instance with PuTTY;
Connecting to AWS EC2 Linux using PuTTY;
Step-by-step guide for AWS EC2 Linux setup PuTTY;
AWS EC2 SSH connection PuTTY tutorial;
AWS EC2 PuTTY private key setup;
Amazon Web Services EC2 Linux instance SSH access;
AWS EC2 Linux machine configuration for PuTTY access;

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How to create aws ec2 instance for windows server machine

Kamrul Hasan — Thu, 26 Oct 2023 15:21:27 +0000

In this tutorial I tried to show how to create windows server ec2 instance in AWS and also I showed how to access that ec2 instance through RDP. If you follow all the instructions step by step, you will be able to create windows server ec2 instance and also will be able to access that machine.

Step 1: Go to your AWS Management Console and select a region where you want to create an instance of Windows machine.

Step 2: Now go to the search bar and type EC2 . Then you will find EC2 service and click on it.

Step 3: You will find EC2 Dashboard like this image and click on instances (running).

Step 4: You will find a window for Launch instances . Now click on Launch instances.

Step 5: Now you will find the Launch an instance page for filling up necessary information for creating a windows server . Follow the below instructions :

→ Provide the name of your windows server. Here I provided a name as “windows-server”.

→ Select your desired windows server. I selected Windows server 2022 and I am using free tier eligible service.

→ Select your desired instance type. I selected t2.micro type which is free.

→ Now you have to create a login key pair for login through RDP (Remote Desktop Connection). Click on “Create new key pair”. And you will find a window.

→ Provide a key pair name. By this key pair you can access your windows server. Now click on “Create key pair” and the key pair will be downloaded. The key pair must save in a secure place.

→ Now Setup your Network settings. Click on the “Edit” button to enable edit option.

→ Now select a VPC . I selected a default VPC (Virtual Private Cloud). Then Select Subnet in your availability zone (or you can create a new subnet). Then Enable “Auto-assign public IP”. Now create a security group or you can use default security group or newly created security group by selecting existing security group option. I created a new security group. Provide a security group name and description as your purpose.

→ Now add Inbound Security Group Rules for public access. Add Rules for RDP, HTTP, HTTPS and assign source type anywhere so that anyone can send requests and get responses from anywhere via Internet.

→ ** You can configure storage from this **storage setting. And There is an Advanced details option for allowing advanced configuration. In this Lab we are not going to set up this advanced feature.

→ Now click on “Launch instance”. After that windows server instance will be created within a few minutes.

→ Now click on “View all instances”. After that will be redirected to the instances list page. Where you will find all instances.

Step 6: Wait until the status 2/2 checks passed . It means your instance is ready to use.

Step 7: Now It is time to access the windows server visually Through RDP. Add a checkmark on your instance and click on “Connect”.

Step 8: After clicking the connect button you will find this window. Now click the RDP client to connect using the RDP client. Then Download the RDP file by clicking “Download remote desktop file” . After that please click on “Get password” for login.

Step 9: After clicking “Get password” , you will find this window for uploading your private key when you downloaded it during creating an instance. I named this private key file “windows-server-key”. You will find this key pair download section of your computer. Now click on “Upload private key file” and upload your private key file. And finally click the “Decrypt Password" button for decrypt your login password and copy it and save it in a secure place.

Step 10: After getting the password then go to your computer > download > here you will find the Remote Desktop Connection file when you downloaded. Open this RDP file by double click.

Step 11: After opening the RDP file . You will find this window and click on “Connect” button.

Step 12: Now paste your copied password here and click the ok button.

Step 13: Now click on the yes button.

Step 15: Hurrah ! yayyy! Now you can access your aws ec2 windows server 2022 machine.

Related Keywords: AWS EC2 instance creation;
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AWS EC2 Windows instance setup;
Launch Windows Server on Amazon EC2;
Amazon Web Services Windows instance tutorial;
Step-by-step guide to create Windows EC2 on AWS;
AWS Windows Server instance configuration;
Windows Server Amazon Machine Image (AMI) selection;
EC2 security group setup for Windows Server;
Connect to AWS Windows EC2 instance;

Kamrul devops; kamrul-hasan-devops; kamrul-hasan-aws-solution-architect; kamrul-devops; kamrul-cloud; kamrul-hasan-devops;

How to create a cyber security fiverr account profile effective way

Kamrul Hasan — Tue, 21 Mar 2023 08:36:06 +0000

Creating a good profile on Fiverr can be a daunting task, but it is crucial for gaining traction and securing clients. In the field of cyber security, a well-crafted profile is especially important as clients need to know they can trust their freelancer with sensitive information. Here are some tips for creating a strong Fiverr profile in the cyber security field.

1. Showcase your expertise
Highlight your expertise in the field of cyber security. Mention any relevant certifications or degrees you have earned. Discuss your experience working with different technologies and software. Your potential clients need to know that you have the skills and knowledge necessary to protect their business from cyber threats.

2. Define your services
Clearly define the services you offer. What are your areas of expertise? What types of security services can you provide? Be specific in what you can offer and don't hesitate to mention any additional services you can provide to your clients.

3. Use professional language
Your Fiverr profile should be professional and informative. Avoid using slang or overly casual language. Use technical language when necessary, but also make sure to explain complex concepts in a way that is easy for clients to understand.

4. Provide relevant work samples
Include relevant work samples in your profile. Clients want to see examples of your previous work to determine if you are a good fit for their needs. If you have worked on cyber security projects in the past, provide examples of your work in your portfolio.

5. Showcase your personality
While your Fiverr profile should be professional, it should also showcase your personality. Clients want to work with someone they like and trust. Talk about your interests and hobbies outside of work. Let clients know what motivates you and what sets you apart from other freelancers in your field.

6. Keep your profile up to date
Make sure to keep your profile up to date. Update your profile with new work samples or certifications as you earn them. Respond to messages from clients in a timely manner. Keeping your profile up to date shows that you are actively engaged in the field of cyber security and are committed to providing top-notch services to your clients.

In conclusion, creating a strong Fiverr profile is crucial for anyone working in the field of cyber security. By showcasing your expertise, defining your services, using professional language, providing relevant work samples, showcasing your personality, and keeping your profile up to date, you can attract new clients and build a successful career on Fiverr.

Here is my profile you can see>> https://www.fiverr.com/kamrul_security

Related Keywords: Malware, Data Breach, Network Security, Phishing, Encryption, Firewall, Cyber Threats,Vulnerability Assessment, Penetration Testing, Cyber Attack, Cyber Crime, Cyber Defense, Cloud Security, Identity Theft, Information Security, Cyber Hygiene, Cybersecurity Framework,Cybersecurity Awareness, Cybersecurity Risk Management, Cybersecurity Incident Response,

How does JavaScript work in browsers? A quick explanation?

Kamrul Hasan — Mon, 30 May 2022 00:27:51 +0000

We know that JavaScript code runs on the browser. The browser has a browser engine to execute the program. Google chrome has v8 engine, fire-fox has Spider monkey engine, Internet Explorer has Chakra engine.

Let’s take an example v8 engine of chrome browser. When v8 engine takes the JavaScript code from the js program source files then v8 engine starts parsing the code using “parser”. Then parsing is converted into “Abstract Syntax Tree(AST). After that interpreter converts this Abstract Syntax Tree to “Byte-code” or by using “Just in Time Compiler “optimized machine code”. Just in Time Compiler Increases the performance and code runs faster. In this way JavaScript code works in v8 engine to execute the program.