Essential Unix Administration

What is the major device number for /dev/loop0? Hint: use ls to examine devices in /dev/, and the size field contains the major and minor device numbers.

Enter a number:

What is the kernel name (names and major numbers are held in /proc/device) for the device /dev/ram0? Hint: Find the major device number as in q1, then use /proc/devices to match the device number to the kernel module. It is in 2 groups, so make sure you know if this is a block or character device.

Enter a string:

What is the process id of rsyslogd? Hint: remember the 'ps aux' command?

Enter a number:

Kill rsyslogd using the kill command.

Restart the rsyslogd services. In a linux system controlled by systemd, you need to use "service" or "systemctl". "service" the easiest.

Try the "service" command with "service rsyslog status".

To start the service again, work out the command to restart the service rather than get its status.

Stop the mysqld service using "service".

Start the mysqld service using "service".

What user does the mysqld service run as? Hint: Normally 'ps aux' would be fine, but the mysqld command name may be too long to see, so try 'ps auxw'. Ignore mysqld_safe.

Enter the user:

Somewhere in the /proc filesystem there is a file which tells you how much swap space has been allocated to the computer. Find that file and then find out how big in bytes the swap space is. Hint: the information that you require is located within the /proc directory.

Enter a number:

What run levels does sshd run at (specified as a list like 139 for runlevels 1, 3, and 9). Hint: Try the chkconfig command with the --help option, and look for the list option.

Enter a number: