Month: November 2009

Some interview topics

If you are preparing for interviews for linux admin jobs you should be familiar with below concepts.. 1) Port number of different servers {cat /etc/services} 2) Linux Installation(through FTP,HTTP,NFS) 3) Boot process 4) Diff b/w ext3 and ext2 5) RAID LEVELS and Selection of raid 6) backup methods 7) Package management such as Yum server 8) Kernel Tuning 9) IPTABLES 10) TCP WRAPPERS 11) DIFFERENT RUN LEVELS 12) USER AND GROUP MANAGEMENT 13) QUOTA SETTING(user and group) 14) DIFF B/W CRON AND AT 15) BASIC SHELL SCRIPTING 16) Troubleshooting different issues. 17) Tell me why we should hire you? 18) DAILY ACTIVITES IN YOUR CURRENT COMPANY 19) RECENTLY SOLVED CRITICAL ISSUE 20) LVM (Very Imp) 21) Vertias Volume manager 22) cluster basic like HAD , GAB , LLT , HEARTBEAT , CONFIG FILES , RESOURCE , SERVICE GROUPS etc. 23 ) kernel panic troubleshooting 24) Process management 25)Configuration part of NFS , NIS , Samba , DHCP , DNS,Apache, Sendmail etc.. 26)Remote administration experience. And many more depending on your job profile. You should know each topics what you mentioned in your resume . If you are not sure about anything , dont mention in your resume and your resume should reflect your skills. Please visit for more linux admin...

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SAMBA Server Configuration

SAMBA(SMB server) is a file sharing server. Which is used to share files between Windows, Linux and Unix Systems. SMB(Server Message Block) is a proprietary protocol which is developed by MicrosoftLets see how we can configure SAMBA in Linux.Step1 : Create a directory where you want to keep data and share with other remote systems(either windows/Solaris/in fact any unix flavor etc).#mkdir /share1 Step2 : Installing Samba server#yum install samba Step3 : Once we install Samba server, configure it using its main configuration file(/etc/samba/smb.conf)Step3(a) : Open smb.conf file and specify the work group where this server belongs #vi /etc/samba/smb.confsearch for workgroup word and specify your work group nameworkgroup = windows-group.Why we require this workgroup? Ans : When windows user try to access any network resource they first try to access my network places and then search for workgroup then to server. So definitly we have to specify this workgroup entry in smb.conf file. Step3(b) : So now we have to give a name to this samba server, search for “server string” with out quotes then provide the samba server name(here that name is linux-share)server string = linux-share Step3(c):Now specify the share details, which folder you want to share. To whom you want to share? Goto last line of the smb.conf file specify your shared folder details as follows.[myshare]comment = “This is my Linux data want to share with my windows...

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How To Find the process running For A Service Or Server Or User?

This is a long time question in my mind. I used to try all sorts of commands to find what process are running by a service/user. The commands are as follows. 1.#ps -ef 2.#top But none of these tools gives number of process run for an Application/User. To serve this purpose there is a built-in command in Linux called pgrep(process grep). Let us have a look in to pgrep usage. Syntax: #pgrep application-name Example: # pgrep firefox Clipped output of the above command 4000 4008 Suppose you need process run by a user then use below command #pgrep -u...

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DIG command explained with examples in Linux

In this post I am going to teach How to use DIG and with examples. DIG is one of the most important tool in debugging DNS server related issues. Some points to be noted about DIG. 1.DIG full-form/abbreviation is Domain Information Groper 2.DIG can work on command line or as well in batch mode 3.DIG supports Internationalized Domain Name(IDN) convections too. 4.DIG is more advanced than older tools such as nslookup and host commands. 5.DIG output have so much information than any other tool, such as Question/Answer/Authority sections (which we are going to discuses in this post) Usage1 : Using...

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11 Basic Linux NMAP command Examples for System administrators

Learn nmap with examples NMAP(Network Mapping) is one of the important network monitoring tool. Which checks for what ports are opened on a machine. Some important to note about NMAP NMAP abbreviation is network mapper NMAP is used to scan ports on a machine, either local or remote machine (just you require IP/hostname to scan). NMAPis can be installed on windows, Sun Solaris machines too. NMAPcan be used to scan large networks, remember I am saying large networks. NMAPcan be used to get operating system details such as open ports, software used for a service and its version no, vendor of network card and up time of that system too(Don’t worry we will see all these things in this post. Please do not try to use NMAP on machines which you don’t have permission. Can be used by hackers to scan for systems for vulnerability. Just a funny note : You can see this NMAP used by Trinity in Matrix-II movie, when she tries to hack in to electric grid super computer. Note : MAN pages of NMAP is one of the best man pages I have come across. It is explained in such a way that even new user can understand what each option do and one more thing is that, it even have examples in to on how to use NMAP in different situations, when you have...

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