How to refresh and reload group membership on Linux without a reboot or logging in again
Do you want to refresh and reload the group membership on Linux without rebooting the Linux machine or logging in again? Try the newgrp command to log in to a …
How to send emails with Postfix and Amazon AWS SES on RHEL/CentOS 8
Amazon Simple Email Service (SES) is a hosted cloud-based email service to send and receive email using your email addresses and domains. Typically SES is used for sending bulk email …
How to enable automatic updates for RHEL/CentOS 8
I talked about yum-cron that provides auto yum updates nightly via cron. However, this package is no longer available on CentOS/RHEL 8 or Fedora Linux 29 or above. So how …
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 …