To install the latest kernel on CentOS 7 using the yum command, you need to follow these steps: Update the yum repository to ensure that you have access to the latest packages: sudo yum update Install the kernel-devel package, which is required for building kernel modules: sudo yum install kernel-devel Install the latest kernel package … Read more

You can write a Raspbian image file to an SD card on macOS / OS X using the command line tool “dd”. Here’s how you can do it: Insert the SD card into your Mac’s card reader. Determine the device name of the SD card by running the following command: diskutil list Unmount the SD … Read more

Debian provides a package called “unattended-upgrades” to automate security updates. Here’s how you can configure it: Install the unattended-upgrades package: sudo apt-get install unattended-upgrades Open the configuration file: sudo nano /etc/apt/apt.conf.d/50unattended-upgrades Enable the automatic upgrade of security updates: Unattended-Upgrade::Allowed-Origins { “${distro_id}:${distro_codename}-security”; // “${distro_id}:${distro_codename}-updates”; // “${distro_id}:${distro_codename}-proposed”; // “${distro_id}:${distro_codename}-backports”; }; Enable email notifications for upgrades: Unattended-Upgrade::Mail “root”; … Read more

The uptime of a Linux server can be found using the following methods: Using the “uptime” command: uptime This command displays the current time, the amount of time the system has been running, the number of users currently logged on, and the system load averages for the past 1, 5, and 15 minutes. Using the … Read more

In iptables, you can specify multiple IP addresses by using the ‘–ipset’ option in conjunction with an IP set. An IP set is a database that holds a collection of IP addresses or CIDR networks and is implemented as a kernel module in Linux. Here’s an example of how you can specify multiple IP addresses … Read more

Here is a step by step guide to install and configure OpenVPN on Debian 9: Update the package index and install OpenVPN: sudo apt-get update sudo apt-get install openvpn Create a directory for the VPN configuration files: sudo mkdir /etc/openvpn/server Copy the sample OpenVPN server configuration file to the new directory: sudo cp /usr/share/doc/openvpn/examples/sample-config-files/server.conf.gz /etc/openvpn/server … Read more

To check and verify the MD5, SHA1, or SHA256 checksum of a downloaded file on macOS, follow these steps: Download the checksum file for the file you want to verify. This file should contain the expected checksum values for the file you have downloaded. Open a terminal window. Change the current working directory to the … Read more

To install and setup PostgreSQL 9.6 on Debian 9, follow these steps: Update the package index: sudo apt-get update Install the PostgreSQL 9.6 package: sudo apt-get install postgresql-9.6 Start the PostgreSQL service and enable it to start at boot: sudo systemctl start postgresql sudo systemctl enable postgresql Change the default PostgreSQL user password: sudo -u … Read more

The method to upgrade LXD (Linux Container Daemon) depends on the operating system it is running on. Here are the steps to upgrade LXD on Ubuntu/Debian and CentOS Linux: For Ubuntu/Debian: Update the package index: sudo apt-get update Upgrade LXD: sudo apt-get dist-upgrade Restart the LXD service: sudo systemctl restart lxd For CentOS: Update the … Read more

To change the root password in Ubuntu, follow these steps: Open a terminal window or switch to a TTY console. Type sudo passwd and press enter. Enter your current user password. Type the new root password and press enter. Re-enter the new root password to confirm. The root password should now be changed. Note: In … Read more