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In commercial organisations management by exception is a term commonly used. It means that no system should be logged into for routine maintenance. Computers are expected to be set up and to run for years with no human intervention. To facilitate this, scripts that monitor the health of a system are common, the idea is that the computer will run with no one checking it. A script will then run on the computer that checks everything looks okay and reports any problems that occur. In some cases the same script can also be used to help an operator investigate an incident. In this
assignment you will write such a script.
In the first instance, you should develop a menu driven programme that an operator can run, which is able to provide them with useful system information. This is all that is expected for a basic pass. Once it is developed, the concept can be advanced so that the application has its ‘own operator status report’ login, enabling the programme to run without giving the operator access to a shell. Advancing the concept further the programme could be developed so that it is able to run with a ‘none interactive flag’ enabling it’s execution to be automated with the resultant file e-mailed to a user perhaps once a day or once a week (please don’t use root’s crontab for this). For the most advanced students the concept could be advanced to the point where a user is e-mailed only if there is a problem that needs to be addressed or repair functions could be added that will allow the system to be changed if things are not as the
What your script covers is completely up to you. However for guidance purposes you may want to consider the following
General system information, such as
The name of the machine
The current system date and time
Licensing information such as the operating system revision level
When was the system last rebooted
Information on registered users, such as
Names of all registered users and/or information about them
Information on users currently logged in
Total number of users
Total disk usage for each user
Details of last logins and/or users who have logged in at unusual times
Details of those users who currently have an account but are not logged on.
Details of users who have not logged onto the system for a certain period of time
(e.g. 1 month, 6 months, 12 months+).
Information on network connectivity, such as
To check the current status of the NIC
The availability of other machines, based on those named in /etc/hosts
To provide additional information about the NIC such as its IP address, the
physical card address ( the MAC address ) and the subnet mask
Information on processes, such as
Those that are running
Those that belong to a specific user
Those that are using a lot of resources
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Hardware utilisation information, such as
The configuration and percentage usage of the UNIX file systems
Amount of RAM and the percentage used
Amount of swap space and the percentage used
Size of the CPU run queue, extent to which the CPU is utilised
Guidance on grades
A basic menu driven script that has four functioning options each of which presents some useful information to the user. For a grade D this information need not be formatted but may simply be the out put of four relevant commands as above but a reasonable range of system information should be accessible to the user (perhaps twelve options). Output and menu structure should be formatted and tidy as should the script. For a higher C grade the techniques used within the menu options to gather information should include additional conditional and/or iteration statements.
Your submission should be sufficient to inform ‘the markers’ of all your achievements.
Consider the following.
A series of screen shots and outputs that provide a comprehensive explanation of everything that your script(s) is capable of.
A listing of your script(s) their implementation and configuration files
A report that combines the submissions together.
On week 11, you will be required to demonstrate your work to your tutor.
Useful Fedora commands (don’t forget the man pages)
uname date whoami
users lspci free
df du ps –ef
top /sbin/chkconfig –list rpm
stat /sbin/ifconfig /sbin/ifconfig eth0
cat /etc/hosts /bin/ping cat /etc/passwd
cat /etc/group /dev/null whereis
ping ping –c1 wc –l
tr cut uname
date mailx -s subject user < filename mailx who who am i whoami last hostname who –q uname –a ifconfig –a ping vmstat netstat sar
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