Linux System Administration
LINUX SYSTEM
ADMINISTRATION
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Linux System Administration - Linux Network Administration - Lecture Slides, Slides of Computer Security
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
Typology: Slides
2012/2013
1 / 15
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LINUX SYSTEM
ADMINISTRATION
SYS ADMIN TASKS
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.
Init Runlevels
Desktop Configuration
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.
Linux Services
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
Linux Services
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
Creating a new User Account
Add an entry in /etc/passwd and /etc/shadow file
(use next uid and suitable gid). You will have to
create the user directory and assign a password to
the user
Use useradd or adduser command to create a new
user (useradd –g -d -c
-s login-name) and groupadd
to create a new group (groupadd group-name). You
will have to assign a password (passwd login-
name)
In GUI: Applications System Settings Users
and Groups Docsity.com
/etc/shadow File
/etc/shadow Contains the encrypted password
information for users' accounts and optionally the
password aging information. Included fields are:
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