Configuring Sudo with the log rotations for 90 days

 To create the logs for 90 days

$touch /var/log/sudolog
 vi /etc/sudoers and add following lines : -----
 Defaults !syslog
 Defaults logfile = /var/log/sudolog ----- Then save it.
 Rotating this log file : vi /etc/logrotate.d/sudolog and put following : ------
/var/log/sudolog {
rotate 90
size 5M
postrotate
/usr/bin/killall -HUP syslogd
endscript
}
To add user in the sudo
User_Alias   SIERRA = sadba

# Cmnd alias specification

# Defaults specification

# User privilege specification
root    ALL=(ALL) ALL
SIERRA  ALL=/bin/chmod , /bin/chown , /bin/su - * , /bin/su * , !/bin/su - , !/bin/su - root
arvind ALL=(ALL) ALL
# Uncomment to allow people in group wheel to run all commands
# %wheel        ALL=(ALL)       ALL

Defaults:SIERRA         !lecture

# Same thing without a password
# %wheel        ALL=(ALL)       NOPASSWD: ALL

# Samples
# %users  ALL=/sbin/mount /cdrom,/sbin/umount /cdrom
# %users  localhost=/sbin/shutdown -h now
Defaults:SIERRA         !lecture,timestamp_timeout=30