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Solaris 10 Interview Questions

> What is the protocol supported by NFS ?

> What is the difference between dsk and rdsk ?
DSK: Block level devices
RDSK: Raw level device or character level device

> How to find the boot path in solaris ?
# prtconf –vp | grep bootpath
# eeprom

> How to bring the process to offline or online ?
# psradm –f (no of the process)
# psradm –a –n ( no of the process)

> How to check the no of the processor available ?
# psrinfo –v

> How will you check the process for particular user ?
# ps –U oracle
#ps –fu oracle | grep smon

> How do you check the no of user logged into the system ?
# who

> How do you check the run level ?
# who –r

> How to enable the telnet or ftp session for one host ?
Edit the /etc/hosts.allow (it will have list of host to access) -> This will show the user list on that host.
/etc/hosts.deny (it will have list of host to access deny)-> This will show the user list on that host.- /etc/services file

> If telnet not working, what are the thing to be checked ?
Ping test, service enable or not in (/etc/inetd.conf), NIS problem

If telnet is not working, first of all you will not be get connected, login through console access and then find out with ps -ef | grep telnetd or Kill -1 <pid_inetd>

> In which file port No's are defined ?
# /etc/service

> Tell me the port for Telnet, ftp,nis,ssh,nfs ?
ftp = 21ssh = 22Telnet = 23nfs = 2049nis = 749

> How will you restart the inetd process?
# Pkill –HUP inetd

> What is nice and renice command do ?
To set the high priority for the process
-20 high priorities
+20 low priorities
Eg: # nice –20 oracle

> What are thing you must ensure to provide security the system ?
1. Latest patches
2. Access to the system:
3. Limited su access
4. Stop unnecessary service at run level
/etc/inetd.config : finger, discard, daytime,charger,tftp,spary & etc

> How will you check the disk performance?
# iostat –xctd 4 5

> What are performance tool used ?
Iostat ,vmstat , prstat , sar ,netstat, top
Which service assign port no dynamically
Rpc service ( /etc/rpc)

As a user how he can change is passwd with root privilege.
Setuid to set on /usr/bin/passwd command

> What is default permission of /etc/passwd , /etc/shadow files ?
/etc/passwd: 644
/etc/shadow: 400

> What is default permission of files and directory?
file: 644
directory: 755

> What is UMASK ?
UMASK is a Unix environment variable, which automatically sets file permissions on newly created files.

> Defalut value for umask ?
umask default value is 022

> Explain setuid, setgid and stickybit ?
Setuid : When setuid permission set on a executable file, user who access the file is granted access permission of the owner of the file.
# find / -prem –4000

setgid : Permission similar to setuid, The process is changed to owner of the file.
# find / -prem –2000

Stickybit : It is a special permission that protect the files within a public writable directory
Stickybit permission set the shared directory, user can create a files or directory
But only by owner of the directory can modify or delete.
# find / -prem –1000

> How to set passwd never expire for a user ?
#passwd –x –1 (username)

> How to find the kernel bit version or architecture ?
# isainfo –kv

> How to set the time zion ?
# /etc/default/init

> How to enable and disable the dtlogin ?
# /usr/dt/bin/dtconfig –e ( enable)
# /usr/dt/bin/dtconfig –d ( disable)

> How to change the hostname and Ethernet address in single command ?
# /usr/sbin/sys-unconfig

> How do you add the disk without reboot the server?
# devfsadm –c disk

> How to delete "abc" files using find command ?
# find / -name "abc" –exec rm {}\;

> What are the NFS daemon in server & client ?
Server Daemons Client Daemons
1 mountd statd
2.nfsd lockd

> How to start / stop the nfs server ?
# /etc/init.d/nfs.server start
# /etc/init.d/nfs.server stop

> How to find out the shared file system from server and client ?
Server : # share & dfmount
Client : # showmount –e (hostname) and dfshares

> To find the OBP environment variable ?
OK printenv

> Expalin soft link and hard link ?
Softlink : link between different file systems and inode number will be different
(eg) /U3 - /U4
#ln –s /U3/file1 /U4/file2

Hardlink : link between same file systems and inode number will be same
(eg) /U3 - /U3
#ln –s /U3/file1 /U3/file2

> Explain FSCK ?
Utility for checking and repairing the files system inconsistence due to abnormal shutdown.
It has 5 phases
Phase 1 : Check block and size
Phase 2 : Check pathname
Phase 3 : Check connectivity
Phase 4 : Check reference count
Phase 5 : Check cylinder group
If super block corrupted how to recover
# newfs –N /dev/rdsk/c0t0d0s6
Then run the fsck utility using alternative super block
# fsck –F ufs –o b=32 /dev/rdsk/c0t0d0s6

> How to create swap file ?
#mkfile 20m /filename
#swap –a /filename
#swap –l ( to view and swap file)
#swap –d ( to delete the swap file)

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