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What is Docker (and Linux containers?)

A while ago, around the release of the Linux kernel version 3, the concept of namespaces and containerization was introduced through a module called lxc (Linux containers). The idea behind a container is sort of similar to the idea of a virtual machine. For example, with virtualisation, you have a server (the ‘host’ ) running something like KVM or VMware. The machines running under it are called guests. They are fully self-contained computers, running on…


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Analysing system performance with ‘Top’

There are literally hundreds of guides on the Internet detailling how to use the ‘top’ command. A very handy command-line tool that has come with UNIX since back in the dark ages, however not all of these guides are directed flatly at the new Linux user. This one won’t go into loads of detail but will give you the basics. Why would I want to run ‘top’ ? Top is a great utility to find out if your Linux machine is running slowly,…