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The key points in the computer security are:Linux System Administration, Setting the Run Level, System Services, User Management, Network Settings, Scheduling Jobs, Quota Management, Backup and Restore, Adding and Removing Software, Setting a Printer
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Setting the Run Level
System Services
User Management
Network Settings
Scheduling Jobs
Quota Management
Backup and Restore
Adding and Removing software/packages
Setting a Printer
Monitoring the system (general, logs)
Monitoring any specific services running. Eg. DNS, DHCP, Web, NIS, NPT, Proxy etc.
The default runlevel for a system to boot to is configured in /etc/inittab.
id:5:initdefault:
In GUI: Applications System Settings Server Settings Services Generally, Linux operates in runlevel 3 or 5.
There are 113 deamons, Out of them, the following are most widely used:
apmd : Power Management
autofs : Automount services
crond : Periodic Command Scheduler
cups : Common Unix Printing System
dhcpd : The DHCP server
dovecot : IMAP (Internet Message Access Protocol) and POP3 (Post Office Protocol) server
gpm : Mouse
httpd : Apache Web server
sendmail : Sendmail Mail Server
smb : Samba Network Services
snmpd : Simple Network Management Protocol
squid : Squid Proxy Server
sshd : Open SSH and SFTP server
syslog : System Logging
xinetd : Provides support for telnet, ftp, talk, tftp etc.
ypbind : NIS Server
Login name Encrypted password Days since Jan 1, 1970 that password was last changed Days before password may not be changed Days after which password must be changed Days before password is to expire that user is warned Days after password expires that account is disabled Days since Jan 1, 1970 that account is disabled