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Script to find memory usage on Ubuntu

This simple script will show the total memory, free memory and percentage of memory used. Have tested it on Ubuntu 14/16 but will work on CentOS as well #!/bin/bash freemem=$(($(free -m |grep "buffers/cache:"|awk '{print $4}'))) totalmem=$(($(free -m |awk 'NR==2 {print $2}'))) usage=$(($totalmem-$freemem)) echo "Memory used: $usage" echo "Total memory: $totalmem" usage=$(($usage*100 / $totalmem)) echo "Usage percentage: $usage" echo "Free memory: $freemem" echo "$TIMESTAMP $totalmem $usage $freemem"
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Outside NAT script on Linux

/sbin/ifconfig eth1:1 202.141.240.174 netmask 255.255.255.248 /sbin/ifconfig eth1:1 up /sbin/iptables -t nat -A PREROUTING -j DNAT -d 202.141.240.174 --to-destination 192.168.0.22 /sbin/iptables -t nat -A POSTROUTING -j SNAT -s 192.168.0.22/32 -d 0/0 --to-source 202.141.240.174 Another useful link http://home1.gte.net/res0psau/security/nat-on-linux.html http://www.cyberciti.biz/faq/linux-demilitarized-zone-howto/
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Implementation of central authentication from Active Directory for Samba Shares

You have configure Kerberos and Winbind to join Active Directory. Configure Samba to use ADS in globals [global] workgroup = ******* realm = ******.COM.PK server string = ***** security = ADS map to guest = Bad Uid password server = ip adrress of Domain Controller log file = /var/log/samba/log.%m max log size = 50 idmap uid = 100000-200000 idmap gid = 100000-200000 cups options = raw [homes] comment = Home Directories read only = No browseable = No [printers] comment = All Printers path = /var/spool/samba printable = Yes browseable = No [Test] path = /d/infopool valid users = rahat.khan, *******\Administrators, *****\rahat.khan admin users = ******\rahat.khan write list = ******\rahat.khan acl group control = Yes guest ok = yes
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fwbaackups

fwbackups is a feature-rich user backup program that allows you to backup your documents anytime, anywhere. It is completely free to download and use without any sort of trial or restrictions. In fact, fwbackups is open-source, which means anybody can use, share it and improve it. If you would like to help develop or test fwbackups, see the developer's page. fwbackups offers a simple but powerful interface that permits you to perform backups with ease. With support for scheduled backups and backing up to remote computers, you will never have to worry about losing your data again. For more information, select a page from the menu on the left of this text. fwbackups - Features fwbackups™ has a rich interface that is both powerful and easy to use. Here are just a few of its many features: * Simple interface: Configuring new backups or restoring documents from a previous backup is a breeze. * Cross-platform: It doesn't matter if you're running Microsoft Windows, Mac OS
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How to start Virtual Machines automatically in VirtualBox

Create Config File for vboxcontrol service script # mkdir /etc/virtualbox # touch /etc/virtualbox/machines_enabled The file “machines_enabled” located in “/etc/virtualbox” is where we list the names of the Guest VM’s that we want vboxcontrol to control. To get a list of your current Guest VM names execute the following command and notice the name is in ” “: $ VBoxManage list vms "Windows XP" {5087b02a-5816-4c76-b302-c13175623023} "Windows 7" {bcae660a-f627-46d6-8c95-9da97363eeea} "Windows 2008" {3907173c-cc15-4820-a930-f0bb3c13cb7e} Add Guest VM’s to “machines_enabled” include one VM name per line # vi /etc/virtualbox/machines_enabled Windows XP Windows 7 Windows 2008 Add VirtualBox VM Service script Create new init.d service script file and give execute permissions # touch /etc/init.d/vboxcontrol # chmod 755 /etc/init.d/vboxcontrol Copy the following code into file “/etc/init.d/vboxcontrol” #! /bin/sh # vboxcontrol Startup script for VirtualBox Virtual
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PacketFence

PacketFence is a fully supported, trusted, Free and Open Source network access control (NAC) system. Boasting an impressive feature set including a captive-portal for registration and remediation, centralized wired and wireless management, 802.1X support, layer-2 isolation of problematic devices, integration with the Snort IDS and the Nessus vulnerability scanner; PacketFence can be used to effectively secure networks - from small to very large heterogeneous networks. PacketFence
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Transferring FSMO Roles

Transferring some or all of the FSMO Roles from one DC to another? Windows 2000/2003 Active Directory domains utilize a Single Operation Master method called FSMO (Flexible Single Master Operation), as described in Understanding FSMO Roles in Active Directory. In most cases an administrator can keep the FSMO role holders (all 5 of them) in the same spot (or actually, on the same DC) as has been configured by the Active Directory installation process. However, there are scenarios where an administrator would want to move one or more of the FSMO roles from the default holder DC to a different DC. Moving the FSMO roles while both the original FSMO role holder and the future FSMO role holder are online and operational is called Transferring, and is described in this article. The transfer of an FSMO role is the suggested form of moving a FSMO role between domain controllers and can be initiated by the administrator or by demoting a domain controller. However, the transfer process is not ini
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