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Making a backup of a CD-ROM with dd is one option. And any other similar device can be copied as well. How would you go about making a complete copy of your entire hard disk It s easy, but I recommend that you first boot your server using the rescue option that you can find on the installation CD. Doing this gives you a complete Linux system that doesn t use any of the files on your server s hard disk, which ensures that no files are in use at that moment. Before you start, make sure you know what device is used by your server s hard drive. The best way to find out is by using the sudo fdisk -l command, which provides a list of all partitions found on your server, with the local hard disk coming first. In most cases, the name of your hard drive will be /dev/sda, but it may be /dev/hda or something completely different. Let s assume that your server s hard drive is /dev/sda, and you now have to attach a second hard drive to your server. Typically, this second drive would be known as /dev/sdb. Next, you can use the dd command to clone everything from /dev/sda to /dev/sdb: dd if=/dev/sda of=/dev/sdb. This command takes quite some time to complete, and it also wipes everything that currently exists on /dev/sdb, replacing it with the contents of /dev/sda. Unfortunately, it often takes several hours to dd everything from one hard disk to another.

Note The Ubuntu file system is referred to as a hierarchical file system. This means that it consists of a lot of

a) Member (some columns)

The last essential system administration task covered in this chapter is logging. It s obviously very important to understand where certain information is recorded on your server. Knowing this helps you troubleshoot when something doesn t work out the way you expect. Also, understanding how logging works may help prevent your entire server from filling up with log files. On Ubuntu Server, syslog is used to configure logging. You ll learn now how to configure it and where its associated log files are written.

directories that contain files. Windows also uses a hierarchical file system. Ubuntu refers to the very bottom level of the file system as the root. This has no connection with the root user, or the directory named /root, which is the personal file storage area for the root user.

You can access the root of the file system by clicking File System in the Places pane in Nautilus. Only users with administrative powers can write files to the root of the file system. This is to prevent damage, because most of the directories in the root of the file system are vital to the correct running of Linux and contain essential programs or data. Most directories allow all users to browse them and access the files within. You just can t write new files there or delete the directories themselves. You might be able to modify or execute programs contained within the directory, but this will depend on the permissions of each individual file. Table 10-3 provides a brief description of what each directory and file in the Ubuntu root file system contains. This is for reference only; there s no need for you to learn this information. The Ubuntu file system broadly follows the principles in the Filesystem Hierarchy Standard1, as do most versions of Linux, but it does have its own subtleties.

Logging on to Ubuntu Server is handled by the syslogd process. The process reads its configuration file /etc/syslog.conf and based on the instructions it finds there, it determines what information is logged to what location. You can even define different destinations for different logs. For example, information can be logged to files or a terminal, or (if it is very important) a message can be written to one or more users who are logged in at that moment. Listing 3-7 shows the default contents of /etc/syslog.conf.

1 The Filesystem Hierarchy Standard, or FHS, is a standard maintained by the Linux Foundation and defines the main directories and their content for the Linux OS.