RHEL 7 HowTo - Linux / Unix Q & A from nixCraft

Delta RPMs disabled because applydeltarpm not installed

last updated October 21, 2019 in CentOS, Linux, Package Management, RedHat and Friends

I am getting the following warning on both CentOS 7 and RHEL (Red Hat) 7 when I run yum command:
Delta RPMs disabled because /usr/bin/applydeltarpm not installed.
What is delta RPM (DRPM) and how does it differ from RPM? How do I fix this issue on a CentOS or RHEL 7 server/desktop?

Disable SELinux on CentOS 7 / RHEL 7 / Fedora Linux

last updated July 18, 2019 in CentOS, Linux, RedHat and Friends, SELinux

I need to disable SELinux on CentOS 7. How can I disable SELinux from the command line over ssh based session?

How to create VM using the qcow2 image file in KVM

last updated November 17, 2018 in CentOS, Debian / Ubuntu, Linux, Linux KVM, Suse

I have image.qcow2 file. How do I install the qcow2 image provided in the qcow2 format? How do I create Linux KVM VM from provided image (say image.qcow2) file?

CentOS 7 Run Script When Network Interface is Up (Network Manager)

last updated October 15, 2018 in CentOS, Linux, Networking, RedHat and Friends

I want to run a shell script or other program immediately after my network interface goes up on a CentOS 7 / RHEL 7 server. I created /sbin/ifup-local, but it is not working on a CentOS 7 box but works perfectly on CentOS 6. I am using NetworkManager with CentOS 7. How do I run ifup-post or ifup-pre scripts?

How to configure Nginx with Let’s Encrypt on CentOS 7

last updated October 2, 2019 in CentOS, Nginx, openssl, RedHat and Friends

How do I secure my Nginx web server with Let’s Encrypt free ssl certificate on my CentOS 7 or RHEL 7 server? How to configure Nginx with Let’s Encrypt on CentOS 7?

How to install PHP 7.2 on CentOS 7/RHEL 7

last updated July 22, 2018 in CentOS, Nginx, PHP, RedHat and Friends

How do I Install PHP 7.2 on CentOS 7 server? How can I setup and install PHP 7.2 on RHEL 7 server along with Nginx web server? How do I configure PHP-fpm version 7.2 with Nginx server running on a CentOS / Red Hat Enterprise Linux version 7?