Archive for the ‘Linux’ Category
Today we are going to go through the process of creating a clustered file system on a pair of Oracle Linux 6.3 nodes. This exercise is not very resource intensive. I am using two VMs each with 1GB of RAM a single CPU and a shared virtual disk file in addition to the OS drivers. [...]
In Part One we went over the basics of sudo, what it is, why we use it, and how it is used properly. In this article we are going to take it a step further and look at specific use cases for sudo. The key thing to remember though, is that you have two ways [...]
What is Sudo? Prior to sudo whenever you wanted to run a command as a specific user then you would su (switch user) to gain access to a shell for that user. This of course required that you knew the password for that user, and it would spawn a new shell after successful authentication. The [...]
Today I am revisiting my previous post on Openvswitch on Ubuntu 12.04. Things have changed since then. Previously Openvswitch was relatively new and as such the userland tools (with libvirt being the one I use) didn’t support it yet, so while you could have used Openvswitch by executing the kvm processes for each VM manually. [...]
Logical Volume Manager makes the dynamic expansion of file systems dead stupid simple. However there is a weakness, if you are using a partitioned file system as your Physical Volume (PV) then you will end up needing to expand the file system if you ever need to grow the actual storage. This can be avoided [...]