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CHAPTER 6 SETTING THE SYSTEM TO YOUR HAND
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Note You normally will not use it, but, if you ever want to work with the /etc/crontab file, be aware
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that, between the time setting and the command you want to execute, the name of the user whose account should be used to execute the command is entered. For example, 0 17 * * * root /sbin/shutdown -h now would make sure the system shuts down automatically every day at 5 p.m. by using the permissions of the user root.
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Executing Once with at
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The cron mechanism is used to execute commands automatically on a regular basis. If you want to execute a command just once, at is the solution you need. The at mechanism comprises different parts: The service atd: Make sure it is started if you want to schedule commands to run once. The files /etc/at.allow and /etc/at.deny: Used to specify which users can and cannot schedule commands with at. The at command: Used to schedule a command. The atq command: Used to display an overview of all commands that currently have been scheduled. The atrm command: Used to delete jobs from the at execution queue. Scheduling a job with the at command is not hard; just use the at command followed by the time when you want to run the command, for example at 17:00. This command opens the interactive at prompt, where you ll enter the commands you want to schedule for execution at the specific time. When you ve finished entering the names of commands, use the Ctrl+D key sequence to close the interactive at prompt, and the commands will be scheduled. The at command has different options to specify when exactly a command should be executed. Some of the most useful options are listed here: HH:MM: In its most elementary form, time is indicated in an HH:MM format; for example an entry of 17:00 will execute the command the next time it is 17:00 hours. am/pm: If you don t like the HH:MM notation, use am/pm instead; for example, at 5 pm. DDMMYY HH:MM: To run a command at a specific time on a specific day, you can use a full day specification as well. Other options are available. For example, you can use words to tell at when to run a command. For example, at teatime tomorrow would run the command at 4 p.m. the next day. Check the at man page for more details.
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Tuning the Boot Procedure
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It s important that you know what happens during the boot procedure of your computer for two reasons. First, you need to know how it works to be able to perform troubleshooting.
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CHAPTER 6 SETTING THE SYSTEM TO YOUR HAND
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Second, you need to be aware of what happens if you want to make sure that a service is activated automatically. In the Linux boot procedure, the following phases can be distinguished: The boot loader GRUB is executed. The upstart process is started. The initial boot phase is executed. The runlevel is activated. In the next subsections, you ll learn in detail how these phrases work and how you can modify the boot procedure.
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Managing the GRUB Boot Loader
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The BIOS of every computer has a setting for the device that should be used for booting by default. Often, the server will try to initiate the boot procedure from its hard drive. It reads the very first sector of 512 bytes (the master boot record, or MBR), in which it finds the GRUB primary boot loader in the first 446 bytes. After that are the 64 bytes in which the partition table is stored; and to finish, in the last 2 bytes are where a magic code is written. Upon installing your server, the installation program writes the GRUB boot code onto the hard drive. This code makes sure that your server is started automatically. However, you can also interrupt the automatic startup by pressing the Esc key. Figure 6-2 shows the menu that you ll see in this case.
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