Linux Administration Online Training By QuontraSolutions

1. QuontraSolutions Online Training with Placement support Call us: 20-3734-1498 Email: info@quontrasolutions.co.uk Website: www.quontrasolutions.co.uk Linux Administration

2. 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.

3. 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

4. Managing User Account • Username Field : • Password Field : • User-ID Field (UID): • Group-ID Field (GID): • GECOS: • Directory: • Shell:

5. 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 user’s login, encrypted password entry, UID, default GID, name (sometimes called GECOS), home directory, and login shell.

6. 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 .

7. 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.

8. Network Configuration File • DEVICE=eth1 • BOOTPROTO=none • HWADDR=00:12:79:9E:DC:0B • ONBOOT=yes • TYPE=Ethernet • DHCP_HOSTNAME=rcciit.com • USERCTL=no • PEERDNS=yes • IPV6INIT=no • IPADDR=192.168.250.24 • NETMASK=255.255.255.0 • GATEWAY=192.168.250.21

9. 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.

10. Service Profile: DHCP • Packages: dhcp • Daemons: dhcpd • Script: dhcpd • Ports: 67(bootps), 68(bootpc) • Configuration: /etc/dhcpd.conf /var/lib/dhcp/dhcpd.leases • Related: dhclient • Sample configuration provided under : /usr/share/doc/dhcp - <version>

11. 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 sender’s folder to reciver’s folder

12. FTP Configuration File • anonymous_enable=YES • anon_upload_enable=YES • /etc/vsftpd/ftpusers ==> denied access • /etc/vsftpd/user_list ==> userlist_enable=YES • userlist_deny=YES/NO

13. 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)

14. 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

15. THANK YOU !!

16. 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 !!