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Written by Cristian Ciobanu
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Monday, 01 August 2011 18:52 |
Introduction
Virtual switches also known as vSwitches are logical switches built into the ESX infrastructure which allows you to connect virtual machines at layer 2 and provide traffic management for virtual machines. A vSwitch has 56 logical ports by default and can be extended up to 4088 ports in vSphere 4. You can create and manage vSwitches through the vSphere Client or through the VMware ESX Service Console using the esxcfg-vswitch command. A vSwitch can be created without any NICs mapped to it, or with one or more NICs mapped to it. If the vSwitch does not have any NICs attached to it is called an internal vSwitch, because it allows communication only within the ESX host. A single ESX host can support up to 127 virtual switches.
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Last Updated on Friday, 19 August 2011 21:15 |
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Written by Cristian Ciobanu
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Tuesday, 31 May 2011 08:45 |
Introduction
Making backups for your MySQL databases is really important, in cases of disasters, data loss, database migration or replication. There are situations when a user with full privileges to a specific database can issue by mistake a DROP DATABASE statement and delete its contents. As a database administrator you should ensure you have regular backups for all databases which can be used for later restoration. There are several tools out there to make database backups and restores but here we'll talk only about the command line tools provided by MySQL.
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Written by Cristian Ciobanu
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Thursday, 05 May 2011 11:03 |
Introduction
The Linux filesystem is based on a hierarchical directory structure where the root mount point is defined by the '/' symbol. In fact everything is a collection of files (files, directories, partitions, pipes, sockets, and hardware devices). Directories are used as containers that list other files. Most Linux distributions follow the Filesystem Hierarchy Standard (FHS) for organizing the filesystem structure. Permissions are used to control who can read, write and execute the contents of a file, and ownership indicates to which username and group a file belongs. If you are working as a system administrator, assigning incorrect permissions or ownership can have serious consequences in terms of security. In this article I will explain the theory and show you how to manipulate them using some practical examples.
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Last Updated on Thursday, 05 May 2011 11:05 |
