In Ansible, the when statement is used to conditionally execute a task based on the outcome of a test. You can use multiple when statements in a task by using the and and or operators to join multiple tests. To use multiple when statements with the and operator, you can use the and keyword followed … Read more
Alpine Linux uses the apk package manager to manage software packages. To see what package updates are available, you can use the apk update command to update the package index, and then run the apk version command to check for updates. Update the package index by running the following command: apk update Check for package … Read more
ZFS on Linux uses the Adaptive Replacement Cache (ARC) to store frequently accessed data in memory. On Ubuntu/Debian, you can set the size of the ARC by modifying the kernel parameters. Check your current ARC size by running the following command: cat /proc/spl/kstat/zfs/arcstats To set the ARC size, you will need to add a kernel … Read more
To copy files remotely on Linux using scp, the basic syntax is: scp [source file] [username]@[remote host]:[destination] For example, to copy a file called “file.txt” from your local machine to a remote host called “example.com” in the user’s home directory, you would use the following command: scp file.txt user@example.com:~/ To copy files remotely on Linux … Read more
There are a few ways to convert a man page to HTML on Linux and Unix. One method is to use the command line tool “groff” to format the man page as HTML. Here is an example command: groff -mandoc -Thtml manpage.1 > manpage.html Another method is to use the command line tool “man2html” to … Read more
To uninstall Nginx on Ubuntu or Debian Linux, you can use the following steps: Stop the Nginx service by running the following command: sudo systemctl stop nginx Remove the Nginx package and its dependencies by running the following command: sudo apt-get remove nginx -y To remove the configuration files and any other files that were … Read more
To install Docker on an Amazon Linux 2 EC2 instance, you can use the following steps: Connect to your EC2 instance via SSH. Update the package index by running the following command: sudo yum update -y Add the Docker repository to your system by running the following command: sudo amazon-linux-extras install docker Install Docker by … Read more
o set or change the hostname on an Amazon Linux EC2 instance, you can use the hostnamectl command. Here are the steps to set the hostname: Connect to your EC2 instance via SSH. Use the following command to set the hostname: sudo hostnamectl set-hostname new-hostname Replace new-hostname with the desired hostname. Verify the hostname has … Read more
You can switch the boot target to text or GUI mode in a system running Linux with systemd by performing the following steps: To switch to text mode, enter the following command in the terminal: sudo systemctl set-default multi-user.target To switch to GUI mode, enter the following command in the terminal: sudo systemctl set-default graphical.target … Read more
You can reinstall a package on a system running CentOS or RHEL using the dnf command. The dnf command is a package manager for RPM-based Linux distributions, such as CentOS and RHEL. Here’s an example of how to reinstall a package using the dnf command: sudo dnf reinstall package_name This command will reinstall the package … Read more