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rhel7

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

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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

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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

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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

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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

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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This article is little outdated as with RHEL 7 now you do not need to copy the bind DNS configuration files into the chroot environment.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)

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How to assign a service to a specific core using systemd in RHEL 7 / CentOS 7

In my last article I have given an overview of systemd with examples. If your service is a multithread service then it may run on multiple cores based on the availability of the threads and

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How to limit CPU count or disable CPUs in a multi core server in RHEL 7 / CentOS 7

There are three different methods using which the number of CPU can be limited in Red Hat Enterprise Linux 7. Method 1: maxcpus Using maxcpus parameter : Add kernel parameter maxcpus=N in /boot/grub2/grub.cfg. IMPORTANT NOTE:

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