To change PHP version for a web site hosted in Virtualmin, click on the Virtualmin tab. Select the domain from drop down that you need to change PHP version for. Virtualmin > YourDomain > Server Configuration > PHP Versions On this page, select PHP version from drop down. See Virtualmin
On a CentOS server, when sending mail from PHP scripts, mail failed to work. On checking postfix log file (/var/log/maillog), i see following error. Aug 11 01:41:53 forums postfix/sendmail[44463]: fatal: open /etc/postfix/main.cf: Permission denied To fix this, disable selinux setenforce 0 To permanantly disable SELinux, run sed -i ‘s/SELINUX=enforcing/SELINUX=disabled/’ /etc/selinux/config
To protect files on Linux by accidently overwritten by > operator, you can use set -o noclobber Now if you try to overwrite a file with >, you will get error root@ok:~# echo “Hello” > 1.txt -bash: 1.txt: cannot overwrite existing file root@ok:~# If you really need to overwrite, use >! operator. echo “Hello” >! … Read more
To extract Audio from Video using ffmpeg, run ffmpeg -i VIDEO_FILE.mp4 audio.mp3
On web servers, you may need to get email alert when someone logs in to your server using SSH. To do this edit file Add In above, replace you@your-domain.com with your actual email address. You need a mail server installed on your server for this to work. If you want to log to a file, … Read more
By default VNC Console on a KVM virtual Machine only listens to localhost. So you need to do SSH tunnel to access VNC console. To make VNC available on all interfaces on Host machine, you need to edit file vi /etc/libvirt/qemu.conf You need to uncomment the line vnc_listen = “0.0.0.0”. # VNC is configured to … Read more
This script will check disk usage on / partition and email you if disk usage is above 80% We can use df / command to find current disk usage df / As you can see, the result have 2 lines. We don’t need first line. To ignore first line, we can use df / | … Read more
To install Linux KVM hypervisor on CentOS 8, run Install libvirtd Enable libvirtd to start on boot Start libvirtd To see status, run Install virt-install Now you have Linux KVM installed. You can use virt-install or Virt Manager to create virtual machine. See Linux KVM Virtualization
I have a movie cut with hjspit. To join them on Linux, run Back to cat
When you run a docker image, it create a container and run it. After docker container stop, container stays, so you can use it again if required. Some times, you need to delete docker container after it is run. This is useful if your docker container is just a command line executable. In my case, … Read more
One of my internet provider only provide IPv4 connection. When i run apt install command, it failed with error as it try to connect using IPv6. To force apt to use IPv4 only, edit Add If you want to force IPv6, add
On rebooting the CentOS 7 server, changes made to resolv.conf is lost. This is because one of the network interface is configured to use DNS server. To fix, edit Remove the line Now NetworkManager will not modify /etc/resolv.conf file on boot. Or you can set valid DNS servers in network config file like If your … Read more