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Question 1:
An important service provided by any system is the ability to run a process on a predetermined schedule without human intervention. The “automation” of tasks can reduce the workload of the system administrator significantly. Unfortunately Linux currently offers not one service but potentially three—cron, anacron, and systemd timer units.
In about a page compare and contrast all three systems. Illustrate your discussion by using the system files /etc/anacron and /etc/crontab and by constructing equivalent systemd service and timer files.
Question 2:
The web administrator of your organisation needs to login remotely to the machine that is running the organisation’s public web site. You tell her that the only way to login is via The Secure Shell—which she knows nothing about! Assuming she is logging in via a Linux boxwrite a help document for her containing the following—
a. A short introduction to SSH, explaining why it is the preferred way of logging into a remote machine—this explanation will need to discuss symmetric and asymmetric key encryption.
Question 3:
A user comes to you requesting that you create and implement a backup policy for his desktop machine. What he wants, is to be able to place a blank DVD in his Single-Sided DVD-burner at the end of the working day on a Friday and have all the files he has been working on for the week backed up automatically that evening to the DVD!
Verified Expert
Linux has three main timer units namely Cron, Anacron and Systemd. There is a distinct set of features that all of these time schedulers in Linux are built with. However, it is a fact that all of these three are merely timers and the application of their usage is quite different from each other. Cron is a time based task scheduler program in Linux. Cron is specifically used in the environment where the system has to be scheduled to very specific times, generally precisely to the minutes and seconds. Tasks can run on particular dates, or repeat at periods as little as consistently. Cron likewise permits clients in extensive national systems to assign the time zone under which their tasks fall, to guarantee fitting execution utilizing local times. Anacron can be considered as ‘Cron’ for laptops and desktops, as it processes in the same way as the Cron.
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