locate RDP-Tcp key under HKEY_LOCAL_MACHINE

Key path:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Terminal Server\WinStations\RDP-Tcp

Find the subkey named PortNumber ,change the value to decimal from Hexadecimal

change port number according to your requirement and save

Reboot your server and test

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Run CMD.EXE  as Administrator.

In terminal , type the following command

netsh  wlan set hostednetwork mode=allow ssid=MyNet key=MyPassword

Replace MyNet, and MyPassword with whatever name you need to give.This command will create  Wireless hotspot with SSID MyNet.

Now start the network  you created with following command.

netsh wlan start hostednetwork

Open Control Panel and go to Network and Sharing Center. Click Change Adapter Settings.

Right click your Internet connection and select Properties.Click the Sharing tab. Check the box that says “Allow other network users to connect.”  Choose your virtual wi-fi adapter and click OK.

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net stop w32time && net start w32time

This should get you setup with minimal registry hack impact.

Note:

• Make sure W32Time is set to Automatic startup mode.
• Make sure UDP 123 is allowed through your firewall.
• Use this Internet Time program to help you debug connectivity to your SNTP/NTP server

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In shortly, Number of ways of selecting zero or more things from ‘n’ different things is given by 2^n-1. In the above example, we are expecting 2^4 -1 = 15 unique combinations.

Implementation Logic :

1. By using the above equation, we can find the number of all possible combinations.
2. Iterate the input list with iterate count is same as that of the number of possible combination.
3. In each iteration, check the bitwise operation result . If it is not zero , then add the corresponding member into the set.. Like wise, find all the combinations.

Its source code is given below.

/**
* @param uniqueIds
* @return
*/
public static Set< Set< Integer > > getAllCombinations(List< Integer > uniqueIds) {
Set< Set< Integer > > combinationsSet = new HashSet< Set< Integer > >();
int listCnt = uniqueIds.size();
int power = (int) Math.pow(2, listCnt);
for (int outer = 1; outer <= power-1; outer++) {
Set< Integer > memeber = new HashSet<Integer>();
for (int inner = 1; inner <= listCnt; inner++) {
int pow = (int) Math.pow(2, inner-1);
if ( ( outer & pow ) != 0 ){
memeber.add(  uniqueIds.get(inner-1) );
combinationsSet.add( memeber );
}
}
}
return combinationsSet;
}
 
 

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UCS-Unified Computing System is a datacenter computing solution which is focused on maintaining greater flexibility and scalability and simplified management. That is all I can say about Cisco UCS in single line. But I know that doesn’t give enough.

Cisco unified computing system or UCS is composed of computing hardware, virtualization software, switching fabric and management software. So this makes datacenter environment and important thing is all this components can be managed by single management unit.

Why UCS?

One of the major expenses for any organization is operating expenses. So by integrating different components into a single platform Cisco UCS reducing the operating expense in large amount. And  of course the centralized management console makes everything simple.

So what makes Cisco UCS???

These are the building blocks of Cisco unified computing system

1. UCS Manager

UCS Manager is the single point management console which is embedded into the fabric interconnects. So UCS manager provides the management to the server, network resources and storage. It also allows the management to the service profiles which could be defined in the manager itself.

2. UCS Fabric interconnect

A UCS system consists of one or two 6100 series fabric interconnect which comes with 20-port and 40-port versions. And it is capable of running UCS manager and also has support for VN-links architecture which required for virtual machine connectivity.

4. Fabric extenders

2100 series Fabric extenders connect the fabric to the blade chassis. Each 5100 chassis has two fabric extender module bays and could be used for redundancy purposes.

5. UCS Blade Server chassis

UCS 5100 series blade chassis are designed to hold UCS blade servers. These blade chassis are logically part of UCS fabric interconnect.UCS blade chassis is designed to support two types of blade servers. Half width and full width. The blade chassis also contains four power-supply bays with power entry in the rear, and redundant-capable, hot-swappable power supply units accessible from the front panel. It also has eight hot-swappable fan trays and two fabric extender slots.

6. UCS Blade Servers

The UCS B-Series blade servers are based on x86 architecture and support Microsoft Windows, Red hat Linux, variants of UNIX, and virtualization software like VMware ESX. The UCS B200 M1 Blade Server is half-width which uses two Intel Xeon 5500 series processors and supports up to 96 GB of DDR3 RAM. The half width server supports a single mezz card and two optional hot-swappable SAS disk drives. The blades also feature the blade service processor or the BMC and support management using IPMI.

7. UCS Network Adapters

UCS got its own network adapters. It carries out the entire network I/O from the servers. These adapters have two unified fabric connections to each of the two fabric extender slots.

image credit: http://www.cisco.com

So how Cisco UCS market is growing??? I have some stats to share.That tells everything.

image credit: http://www.cisco.com

Reference: Cisco.com

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Steps:

#yum install exim system-switch-mail

After successful installation, we need to make some necessary configurations. Switch default MTA(Mail Transfer agent) to exim if it is sendmail or any other application by using system-switch-mail. Then stop sendmail service if it is running and disable in startup.

#service sendmail stop
#chkconfig  sendmail off

And start exim service and enable to start at boot time

#service exim start
#chkconfig exim on

If you want to enable manual routing for mail then ,add  the following  entry in “dnslookup” section in /etc/exim/exim.conf

driver = manualroute
domains= !+all
transport= remote_smtp
route_list=”* mail1.remoteserver.com;”

And restart exim

#service exim restart

Verify the configurations by sending test mail

#echo “test mail”|mail -s “$HOSTNAME” user1@domain.com

And check the mail received or not.

That’s it you are done with basic exim configuration

Note:

Some  time exim service will dead by throwing some errors like exim dead but subsys locked .This can be happen because of different causes. Here I will give you some .

1. If you are getting an error “IPv6 socket creation failed: Address family not supported by protocol” in panic.log then check the following line in /etc/exim/exim.conf

local_interfaces = <; 127.0.0.1 ; ::1
And remove the entry   ::1 to disable IPv6 and restart exim, then exim will work fine

2. Check the size of exim_mainlog .If it is too big then clear it and try to restart the service.(During first time setup there is no chance for  this  case to happen).

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#find /var/log -mtime +200
After verifying ,you can delete those files/folders

#find /var/log -mtime +200 -exec rm {} \;

Note:If you want the files  which only have the extension “.log” then
#find /var/log -name ‘*.log’ -mtime +200 -exec rm {} \;

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Download path:  http://fuse.sourceforge.net/sshfs.html

1. FUSE

package: fuse-2.8.5.tar.gz

Extract and install
#tar xvf fuse-2.8.5.tar.gz
#cd fuse-2.8.5
#./configure
#make
#make install

After successful installation,install SSHFS

2.SSHFS

package: sshfs-fuse-2.2.tar.gz

Extract and install
#tar xvf sshfs-fuse-2.2.tar.gz
#cd sshfs-fuse-2.2
#./configure
#make
#make install

Now we can use sshfs to mount sftp share.Before mounting,create mount point where the share to be mounted.
#mkdir /mnt/ftpshare

Mount command:  sshfs <username>@<ftpserver IP/host>:/<ftp_share_path> /<mountpoint>

Eg:
#sshfs testuser@192.168.1.2:/home/testuser /mnt/ftpshare/

This will prompt for password if user configured any password.

NOTE:  If you want to avoid prompting for password,then you should configure passwordless(key based) ssh login between these servers.(Assuming you are aware of how to configure it)

Verify the mounted partition using df command.

To mount this share directory in boot time,we need to add the following entry in /etc/fstab

sshfs#testuser@192.168.1.2:/home/testuser     /mnt/ftpshare          fuse                   defaults        0 0

NOTE:     For unmounting this partition,we can use fusermount command as below
#fusermount -u /mnt/ftpshare/

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Login to linux server as root
create required mount point
#mkdir /mnt/winshare
Mount windows share with following command
#mount -t cifs //winserver/winshare /mnt/winshare
This is for mounting password less share.We can also share windows share to linux machine with username and password use the following command for mounting windows share which is restricted with password

#mount -t cifs //winserver/winshare -o username=<username>,password=<password> /mnt/winshare

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