How to restart CentOS or RHEL server safely
I use the reboot command to reboot our PostgreSQL server running on RHEL 7. We have a development server running on CentOS 7 too. However, sometimes I noticed database corruption …
How to check if CentOS / RHEL needs a full reboot
I am using a CentOS/RHEL 6/7/8 server. How do I check from the command line if a reboot is required for my CentOS host? How do I check if a …
How to view status of a service on Linux using systemctl
How do I use the systemctl command to view status of a systemd service on Linux operating systems?We use systemctl status command under systemd to view the status of the …
How to install less on CentOS / RHEL / Fedora
One of my PHP and bash scripts depends upon less command to display the help system to other users. But, whenever they run less on a particular version of CentOS …
How To Set Up WireGuard Firewall Rules in Linux
How do I set up WireGuard Firewall rules (iptables) in Linux?For road warrior WireGuard and other purposes, you need to set up and configure firewall rules. You need to configure …
How to backup and restore LXD containers
Now that I set up an LXD container, how do I backup and restore LXD containers running on Ubuntu/Debian or Fedora/CentOS Linux server?Backing up your LXD server is an essential …
How to find ulimit for user on Linux
How can I find the correct ulimit values for a user account or process on Linux systems?For proper operation, we must ensure that the correct ulimit values set after installing …
How to extract tar.xz files in Linux and unzip all files
How do I extract tar.xz files in Linux? Can you tell me command to unzip linux-5.6.13.tar.xz file? How can I uncompressing (or decompressing) all files in the current directory?The tar …
How to forcefully renew Let’s Encrypt certificate
How do I forcefully renew the Letsencrypt certificate on an Ubuntu, Debian, CentOS, RHEL, Fedora, or FreeBSD Unix systems?As you know, Let’s Encrypt is a free, automated, and open certificate …
Systemd systemctl list all failed units/services on Linux
Is there is a command to print list all failed units or services when using systemd on Linux? Can you tell me the systemctl command to list all failed services …