System Administration Development Tutorials, Guides & Insights

  sudo dpkg --update-avail

Updates available packages by checking online repositories and downloads the latest versions to your local repository.

   sudo service iptables save

• Delete a Rule:

Docker is an open-source platform that automates the deployment of applications inside lightweight, portable containers. Containers include everything an application needs to run, such as libraries, dependencies, and configurations, ensuring that it behaves the same regardless of where it is deployed.

• Consistency: Docker containers ensure that applications run the same way across different environments.
• Efficiency: Containers are lightweight and share the host OS kernel, making them more resource-efficient than virtual machines.
• Scalability: Docker makes it easier to scale applications, allowing you to deploy multiple containers across a cluster.

sudo yum update package-name

sudo yum remove package-name

This command sets the permissions for all files and subdirectories within directoryname.

The chown (change owner) command is used to change the owner and group of a file or directory.