Change PHP version in Virtualmin Server
To change PHP version for a web site hosted in Virtualmin, click on the Virtualmin tab. Select the domain from drop down…
linux
fatal: open /etc/postfix/main.cf: Permission denied
On a CentOS server, when sending mail from PHP scripts, mail failed to work. On checking postfix log file (/var/log/maillog), i see…
Protecting files with noclobber
To protect files on Linux by accidently overwritten by > operator, you can use set -o noclobber Now if you try to…
Extract Audio from Video using ffmpeg
To extract Audio from Video using ffmpeg, run ffmpeg -i VIDEO_FILE.mp4 audio.mp3
Email Alert When User Login Using SSH
On web servers, you may need to get email alert when someone logs in to your server using SSH. To do this…
KVM VNC Allow Remote Access
By default VNC Console on a KVM virtual Machine only listens to localhost. So you need to do SSH tunnel to access…
Bash Script to Monitor Disk Usage
This script will check disk usage on / partition and email you if disk usage is above 80% We can use df…
Install Linux KVM on CentOS 8
To install Linux KVM hypervisor on CentOS 8, run Install libvirtd Enable libvirtd to start on boot Start libvirtd To see status,…
Joining files with Cat on Linux
I have a movie cut with hjspit. To join them on Linux, run Back to cat
Docker delete container after running
When you run a docker image, it create a container and run it. After docker container stop, container stays, so you can…
apt force IPv4
One of my internet provider only provide IPv4 connection. When i run apt install command, it failed with error as it try…
CentOS 7 resolv.conf make changes permanent
On rebooting the CentOS 7 server, changes made to resolv.conf is lost. This is because one of the network interface is configured…