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Disable monitor blanking on Debian with LXDE for remote access using NoMachine and VNC

Edit file: /etc/xdg/lxsession/LXDE/autostart
Remove:
@xscreensaver -no-splash

Append:

@xset s noblank
@xset s off
@xset -dpms

Sources: https://raspberrypi.stackexchange.com/questions/752/how-do-i-prevent-the-screen-from-going-blank

Patch vSphere 5.5 Updates

https://kb.vmware.com/s/article/2008939
(OLD: http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=2008939)

http://www.v-front.de/2014/09/vmware-releases-vsphere-55-update-2.html

Search for string in file system in Linux

Search for the string ‘root’ in the entire filesystem

# grep -H -R root ./* | cut -d: -f1

Source: http://www.cyberciti.biz/faq/howto-search-find-file-for-text-string

Shrink qemu qcow2 files

Excerpt from source:

Windows Guest

1.Delete all unnecessary files, empty recycle bin
2.Defragment drive (you might need to do this several times, until you see it “compacted” well)
3.Use sdelete to zero free disk space. Please note that this operation will cause that all drive free space will be filled by zero, so the virtual machine image will grow to the maximum size.

Using command prompt

sdelete -c c:

Linux/FreeBSD Guest

# dd if=/dev/zero of=./zero bs=1M
# sync
# rm -f ./zero

Note, the bs parameter is important, since it greatly reduce time necessary to complete this task.

Host
Convert image to the same format that is currently is (e.g. qcow2 => qcow2)… during this procedure it will release unused space.

# qemu-img convert -O qcow2 w2k3.qcow2 w2k3-shrinked.qcow2

Source:
http://mindref.blogspot.com/2011/07/shrink-qcow2.html

Download sdelete from here:

https://technet.microsoft.com/en-us/sysinternals/bb897443.aspx

Find files larger than 50 megabytes in Linux

Find files larger than 50 megabytes

$ find . -type f -size +50000k -exec ls -lh {} \; | awk '{ print $9 ": " $5 }'

Reference: http://www.cyberciti.biz/faq/find-large-files-linux

Best compression using tar and 7z

Compress using tar and 7z

$ tar cf - <source folder/file> | 7z a -si <Destination archive>.tar.7z

$ 7z x -so yourfile.tar.7z | tar xf - -C target_dir

Reference:
1. http://askubuntu.com/questions/300097/how-do-i-create-tar-7z-file-from-the-command-line

2. http://askubuntu.com/questions/341628/how-to-extract-tar-7z-files-from-command-line

Converting OVA to QCOW2 for use with QEMU/KVM

$ tar -xvf file.ova

$ qemu-img convert -O qcow2 file.vmdk file.qcow2

Block Inbound for Ports 135, 445, 1028 and Ping (ICMP 8) for Windows 7, 2008 Server

For workstations/servers that are public Internet facing and do not have a  hardware/software firewall solution, use Windows Firewall with Advanced Security and block port 135, 445, 1028 and PING (ICMP 8) .  GRC’s Shields Up! shows these ports as being open.

Reference:

https://www.grc.com/x/ne.dll?bh0bkyd2
http://www.rackspace.com/knowledge_center/article/creating-an-inbound-port-deny-rule-for-windows-firewall-windows-2008

Check Linux with rootkithunter and chkrootkit

Debian Linux

# apt-get install chkrootkit rkhunter

# aptitude install chkrootkit rkhunter

CentOS 6.x

# yum install chkrootkit rkhunter

Import Active Directory Domain Services Cmdlets

Open Powershell Prompt

PS C:\> Import-Module active*
PS C:\> Get-Command -Module active

Reference:

http://blogs.technet.com/b/heyscriptingguy/archive/2010/01/25/hey-scripting-guy-january-25-2010.aspx