Linux Administration Online Training by QuontraSolutions

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Linux Administration

• QuontraSolutions
• Online Training with Placement
  support
• 
  Call us 20-3734-1498
• 
  Email info_at_quontrasolutions.co.uk
• Website www.quontrasolutions.co.uk

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Basic about Linux

• What is Linux ?
• -Linux is an open source, freely distributable
  Unix like operating system that uses Linux kernel
  .
• What is Kernel ?
• - Kernel is the program acting
• as chief of operations.
• Is Linux Free?
• -Yes, Linux is one of the most prominent
  examples of free and open source software
  collaboration.

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Installation of Linux
Methods of installing Linux -FTP-This is one of
the earliest methods for performing network
installations. -HTTP-The installation tree is
served from a web server. -NFS-The distribution
tree is shared/exported on an NFS server. -SMB-
This method is relatively new, and not all
distributions support it. The installation tree
can be shared on a Samba server or shared from a
Windows box. -From the Optical Media
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Managing User Account

• Username Field
• Password Field
• User-ID Field (UID)
• Group-ID Field (GID)
• GECOS
• Directory
• Shell

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Managing User Account

• Under Linux, every file and program must be
  owned by a user. Each user has a unique
  identifier called a user ID (UID).
• Each user must also belong to at least one group,
  a collection of users established by the system
  administrator.
• Users may belong to multiple groups. Like users,
  groups also have unique identifiers, called group
  IDs (GIDs).
• The /etc/passwd file stores the users login,
  encrypted password entry, UID, default GID, name
  (sometimes called GECOS), home directory, and
  login shell.

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File System of Linux
A file system is a data structure which
interprets the physical sector of a disc into
logical directory structure. The logical
structure will help computers and users to trace
files. The file system registers the location of
the files and directories on the disc .
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Network Configuration

• The ifconfig program is primarily responsible for
  setting up network interface cards (NICs).
• All of its operations can only be performed
  through command-line options, as its native
  format has no menus or graphical interface.
• Multiple IP address can be assigned for single
  NIC.
• Network configuration file stores in
  /etc/sysconfig/network-scripts/ifcfg
• Global Parameter configuration file stores in
  /etc/sysconfig/network.

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Network Configuration File

• DEVICEeth1
• BOOTPROTOnone
• HWADDR0012799EDC0B
• ONBOOTyes
• TYPEEthernet
• DHCP_HOSTNAMErcciit.com
• USERCTLno
• PEERDNSyes
• IPV6INITno
• IPADDR192.168.250.24
• NETMASK255.255.255.0
• GATEWAY192.168.250.21

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DHCP

• DHCP provides a method for hosts on a network to
  request, and be granted, configuration
  information including the addresses of router and
  nameservers.
• DHCP forwarding agents allow clients to receive
  addresses from a server which is not located on
  the same network segment.
• IP addresses are either dynamically assigned from
  a range or pool of addresses or statically
  assigned by MAC address.

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Service Profile DHCP

• Packages dhcp
• Daemons dhcpd
• Script dhcpd
• Ports 67(bootps), 68(bootpc)
• Configuration /etc/dhcpd.conf
• /var/lib/dhcp/dhcpd.le
  ases
• Related dhclient
• Sample configuration provided under
  /usr/share/doc/dhcp - ltversiongt

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FTP

• FTP configuration file stores in
  /etc/vsftpd/vsftpd.conf
• Default User(Anonymous) can access only /var/ftpG
• Generally used to transfer single with proper
  authentication from previously configured
  senders folder to recivers folder

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FTP Configuration File

• anonymous_enableYES
• anon_upload_enableYES
• /etc/vsftpd/ftpusers gt denied access
• /etc/vsftpd/user_list gt userlist_enableYES
• userlist_denyYES/NO

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Telnet

• Telnet is a network protocol used on the Internet
  or local area networks to provide a bidirectional
  interactive text-oriented communications facility
  using a virtual terminal connection. User data is
  interspersed in-band with Telnet control
  information in an 8-bit byte oriented data
  connection over the Transmission Control
  Protocol (TCP).
• Telnet can not restrict a user after connection
  to the host has made, (i.e a user telnetting to a
  remote host can totally access the host computer
  if he logged in as a root)

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Network File System/Service

• The Network File System (NFS) was developed to
  allow machines to mount a disk partition on a
  remote machine as if it were a local disk. It
  allows for fast, seamless sharing of files across
  a network.
• Exported directories are defined in /etc/exports
• Each entry specifies the hosts to which the
  filesystem is exported plus associated permission
  and options

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THANK YOU !!
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• Linux Administration
• Basic about Linux
• Installation of Linux
• Network Configuration
• Network Configuration File
• DHCP
• Service Profile DHCP
• FTP
• FTP Configuration File
• Telnet
• Network File System/Service
• THANK YOU !!