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How to use Dockerfile? This file contains user commands which will be needed to build an image. This is the simplest way that I can explain this. For more information please follow the Dockerfile reference guide The following image shows a sample Dockerfile that I created to build an image with php. I will explain line by line. FROM php:7.4.4-apache - This is where you define what image you will be using to build a custom image COPY site1/ /var/www/html - This is will copy the local path content to remote path (to container) EXPOSE 80 - This is where you define which port should be exposed After creating a Dockerfile now you can build the image.  docker build -t somename #this command is to build an image with the given tag name After creating the image you can run docker images to view if the created image exists. If you want to check if the image is created or not just run this command. docker images, this will show all the images created. As you have seen the image name shows phptu

What is docker? Docker is a set of platform as a service products that uses OS-level virtualization to deliver software in packages called containers. Containers are isolated from one another and bundle their own software, libraries and configuration files; they can communicate with each other through well-defined channels Difference between docker and virtual Machines How to setup and run your first docker image? First install the docker for your preferred operating system. I have done my setup on ubuntu and that's my preference. Here is official docker website link for supported platforms and how to proceed installation. https://docs.docker.com/engine/install/ In docker you can run any microservices that you like and you can build your own images to run in the docker. Docker hub is a such a place which have thousands of images of microservices that can be run in seconds. By running docker you can run containers for each service you need to run.  For example, if you want to run my

What is NMAP & use of it? Basically NMAP is a free security scanner and a network mapper mainly used by system administrators, hackers , pentesters and etc.  These are few use cases of NMAP and there are tons of ways to use NMAP. Finding hosts in the network ports used by hosts and its status Finding vulnerabilities Information on versions and OS used Basic NMAP Scan nmap -sP 192.168.1.0/24 Ping multiple host to check if the hosts are alive or not Screen capture of scan TCP scan (full open scan) nmap -sT 192.168.1.9 This is a TCP connect scan. TCP connections are done with a 3 way handshake SYN SYN-ACK ACK This is otherwise called as full open scan Screen capture of scan Wireshark packet capture Stealth Mode Scan (Half open scan) namp -sS 192.168.1.9 This is known as SYN scan / Half open scan / Stealth scan SYN SYN-ACK RST Screen capture of

for full post please visit  https://blog.particle.io/2019/12/12/particle-ota-101/