HowTo: Revoke OpenSSH Keys and Disable User Access

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Many users are using ssh to log into a remote machine and append the indicated identity file to machine’s ~/.ssh/authorized_keys file. I recently moved one of my server, and I would like to revoke openssh keys and disable user access under Linux operating systems. How do I revoke OpenSSH keys under Unix or Linux operating systems?

Ubuntu Linux NFS Server installation and Configuration

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Q. How do I install and configure NFS 4 Server under Ubuntu Linux ?

A. In order to set NFS server you need to install the following packages:

=> nfs-kernel-server – Linux NFS Server

=> nfs-common – NFS Common programs

=> portmap – The RPC portmapper

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