How to check and update planned day light saving (DST) changes (timezone) in Linux

How to check and update planned day light saving (DST) changes (timezone) in Linux

Daylight Saving Time happens in multiple countries across the globe and in many places the DST keeps changing every couple of years. IMPORTANT NOTE: If your system is configured with online NTP pool servers then you need not worry about the leap seconds or DST changes as NTP server will take care of all these ... Read more How to check and update planned day light saving (DST) changes (timezone) in Linux

How to disable or enable hyper threading on my Linux server

How to disable or enable hyper threading on my Linux server

In my last article I had shared steps to limit CPU count on your multi core Linux system and to assign a service to a specific CPU core in CentOS / RHEL 7 Hyper threading uses processor resources more efficiently, enabling multiple threads to run on each core. As a performance feature, it also increases ... Read more How to disable or enable hyper threading on my Linux server

How to migrate (move) logical volumes and volume groups from one disk to another disk online without reboot in Linux

How to migrate (move) logical volumes and volume groups from one disk to another disk online without reboot in Linux

In this article I will show you two methods to migrate a logical volume /dev/rhel/lv1 from one disk to another without reboot assuming you have the extra disk already available on your system. Below steps are validated on Red Hat Enterprise Linux 7 Also in the end of the article a quick example to migrate ... Read more How to migrate (move) logical volumes and volume groups from one disk to another disk online without reboot in Linux

Best practices to harden and increase security with ssh (ciphers, MACs etc)

In my another article I have shared the steps to configure SSH port forwarding and tunnelling in Linux Below are some of the selected arguments which can be used in sshd_config to harden the ssh based security. There can be many more such arguments which you can find from man page of sshd_config HostKey A ... Read more Best practices to harden and increase security with ssh (ciphers, MACs etc)

How to configure NTP client to sync with NTP server during system startup (boot) in (RHEL 7 / CentOS 7) Linux

While working on NTP server on my setup I realised that in Red Hat Enterprise Linux when we a service restart for NTPD or chronyd, the local time does not syncs with the NTP server immediately and it takes some time before syncing the local clock So we have to manually sync the clock with ... Read more How to configure NTP client to sync with NTP server during system startup (boot) in (RHEL 7 / CentOS 7) Linux

Step by Step tutorial guide to configure BIND DNS server in chroot environment for Red Hat (RHEL/CentOS) 7

Step by Step tutorial guide to configure BIND DNS server in chroot environment for Red Hat (RHEL/CentOS) 7

This article is little outdated as with RHEL 7 now you do not need to copy the bind DNS configuration files into the chroot environment. Step-by-Step Tutorial: Configure DNS Server using bind chroot (CentOS/RHEL 7) In this article I will share the list of steps to configure DNS server on RHEL 7 or CentOS 7. ... Read more Step by Step tutorial guide to configure BIND DNS server in chroot environment for Red Hat (RHEL/CentOS) 7