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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

Resetting the ESX host firewall policy in ESX 4.x

Resetting the ESX host firewall policy in ESX 4.x

You cannot stop the firewall service in ESX 4.x. If you try, you see the
message:

Firewall can’t be stopped. To disable the firewall run:
esxcfg-firewall –allowIncoming –allowOutgoing

You can allow all packets through the firewall by running the command:

$ esxcfg-firewall --allowIncoming --allowOutgoing

To return the firewall configuration to its previous setting, run the
command:

$ esxcfg-firewall --blockIncoming --blockOutgoing

http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1003634

create backup of entire filesystem with tar and bzip compression

# tar -cjvpf backup.tar.bz2 --exclude=backup.tar.bz2 --exclude=proc --exclude=sys --exclude=dev .

dd using netcat to /dev/sdx / or from/to image file

destination:

# nc -l 19000 | bzip2 -d | dd bs=16M of=/dev/sda

source:

# dd bs=16M if=/dev/sda | bzip2 -c | nc serverB.example.net 19000

Reference:
http://www.ndchost.com/wiki/server-administration/netcat-over-ssh

OR

dd from source partition to destination image file

destination:

#nc -l 19000 | bzip2 -d | dd bs=16M of=/path/imagefile.dd

source:

# dd bs=16M if=/dev/sda | bzip2 -c | nc source.server.com 19000

dd from source image file to destination partition

destination:

#nc -l 19000|bzip2 -d | dd bs=16M of=/dev/sda

source:

# dd bs=16M if=/path/imagefile.dd|bzip2 -c | nc source.server.com 19000

Reset iptables firewall

# /sbin/iptables -F
# /sbin/iptables -X
# /sbin/iptables -t nat -F
# /sbin/iptables -t nat -X
# /sbin/iptables -t mangle -F
# /sbin/iptables -t mangle -X
# /sbin/iptables -P INPUT ACCEPT
# /sbin/iptables -P FORWARD ACCEPT
# /sbin/iptables -P OUTPUT ACCEPT

Online Anti-Virus Websites and Tools