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Note There s a fine line between security concern and paranoia. Connecting to a remote machine for the first time and accepting its ssh key is considered insecure by some people, because you cannot be 100 percent sure that the remote machine is the one you want to connect to. It might have been swapped for a different machine by crackers. In addition, the key might be intercepted on its journey to you. Because of this, those who are highly security conscious can use the ssh-keygen program or Seahorse (see 8) to create a key on the remote machine first, and then import it to the local machine before logging in. See the ssh-keygen man page or www.openssh.com for more details.

After confirming that you want to make the connection, you re invited to enter the password for the user account under which you initiated the ssh connection. After this is done, you should find yourself with a shell login on the remote computer. You can run the same commands as usual and perform identical tasks.

If, due to some error, the superblock isn t accessible anymore, you have a serious challenge. Fortunately, some backup copies of the superblock are written on the Ext3 file system by default. Using these backup copies, you can still mount a file system that you may have otherwise considered lost. And, as you can guess, the dd command is an excellent help. The actual position on disk of the first backup of the superblock depends on the size of the file system. On modern large file systems, you will always find it at block 32768. To try if it really works, you can mount from it directly using the mount option -o sb. The issue, however, is that mount expects you to specify the position of the superblock in 1,024 byte blocks, whereas the default block size for a modern Ext3 volume or partition is often 4,096 bytes. (Use dumpe2fs if you want to be sure about that.) Therefore, to tell the mount command where it can find the superblock, you have to multiply the position of the superblock by 4, which in most cases results in a block value 131072. If, for example, your /dev/sda5 file system should have a problem, you can try mounting it with the command mount -o sb=131072 /dev/hda5 /somewhere. Did the file system mount successfully If so, the problem really was in the superblock. So let s fix that problem by copying the backup superblock back to the location of the old superblock. You can do this using dd if=/dev/hda5 of=/dev/hda5 bs=1024 skip=131072 count=1 seek=1. Once finished, your file system is accessible again, just as it was before.

The machine you re logged in to will show no symptoms of being used remotely. It isn t like the movies, where what you type on your local machine is somehow mirrored on the remote machine for all to see. However, obviously, if a user of the remote machine were to view her network connections using something similar to the netstat command, then she would see another computer attached via ssh. To end an ssh session, simply type exit to return to the command prompt on your own machine. You can also press Ctrl+D to log out.

Figure 5-1. Data model for coaches and members (not recommended!)

Tip There s a version of the ssh client that runs on a variety of non-Linux operating systems, making it possible to log in to your Ubuntu machine from a Windows computer. The program is called PuTTY and can be downloaded from www.chiark.greenend.org.uk/~sgtatham/putty/ and many mirrors of this site around the world. PuTTY is also available for Linux, and you can install it using Ubuntu Software Center. It is useful to access another Linux machines without having to open a terminal window each time. Another graphical front-end for ssh and scp is SecPanel, also available in Ubuntu Software Center.

Summary