GNU/Linux - useful commands

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Citrix - Xenserver - Migrate MAC address

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This post provides two scripts based on the shell of linux to export basic network information of your XenServer's virtual machines (VMs) , this will include the VM 's name, the device number, the MAC address and the network name of all the virtual interfaces (VIFs) of every VM of your pool, it has to be known that this software only works fine when the name of you VM s and the name of your networks have no spaces in between neither leading spaces, so rename this paramenters before using the scripts. Why should you like to save this information? In the following scenario: There are 2 sites in your company, one of them are the principal one, there you have provisioned VM 's with DHCP reserved to their MAC addresses, the alternate site is a recovery site, where you have to make work your VMs if the main site fails, as a requirement you have to have: Repplication LUNs from one site to the other, the VM 's disks have to be in a shared Storage Repository (SR) , the ...
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Block web sites on Windows

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Here is how to make your windows computer (Not Server) to become a DNS server. Why should you do that? Avoid webpages to redirect you to anoying sites, publicity you don't need, or if you want to restrict access so some pages without having a proxy server or software. There are a vast number of web pages that when you click on something, they open a new window and connect you to a different web site, this other web sites may contain only unuseful content or dangerous content. Ways to avoid it: a)  Include your URLs in your web browser restriction access list. Limitations:  It is needed to configure a per communication protocol domain restriction list, I find it not very flexible. b)  Configure your windows  C:\Windows\System32\drivers\etc\hosts  file . This method overcomes option  a)   by adding only one line per web site   protocol connection (ftp, http, https, etc), so you have to configure only one line to avoid whatever the...
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Micro sd read only ubuntu

I wasn't able to format a micro sd card using ubuntu. So I saw several threads but none worked on my device. The following steps allowed me to format it. This wasn't my sd card so I was able to validate all once, but not find if all steps are required. #Find the device you want to access: sudo fdisk -l #Example output: /dev/sdb1 #Set some variables to ease the access to your device DEV=dev/sdb DEVX=dev/sdb1 #The following code lines seemed to fix the problem, including the last one. Them alone don't seem to work sudo chown ${USER}:${USER} -R ${DEV} sudo chown ${USER}:${USER} -R ${DEVX} find ${DEV} -type d -execdir chmod 777 -Rv {} + find ${DEVX} -type d -execdir chmod 777 -Rv {} + chmod 777 ${DEV} chmod 777 ${DEVX} sudo mount -orw,remount ${DEV}
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