What is a container?

 A native, default zone on the Oracle Solaris 10 OS is called a container. The other containers that run on Oracle Solaris 10 include Oracle Solaris 8 Containers and Oracle Solaris 9 Containers. Many people use the terms "zone" and "container" interchangeably.

how to install JAVA in LINUX?

download  latest version of java and extract it in /usr/local #./jdk-6u14-linux-i586.bin

#which java : display java location

#cd /usr/local
#ln -s jdk1.6.0_14 java : create soft link with name java
#mv /usr /bin/java /usr /bin/java.org
#ln -s /usr/local/java/bin/java  /usr/bin/java
#/usr/bin/java -version : it will display the latest version of java

password expiration extension command for UNIX?

LINUX:-

if password has expired.no need to reset password.we can extend the password.

#chage -d <date year-month-day:current date>  user

solaris:
#usermod -e  <data it has to expire> username

in solaris,suppose to day date is may10th. u have to give as auguest10th. i.e password has extended up to aug 10th. in linux u have to give to day date.

how to synchronize system local time with hwclock by using NTP server in LINUX?

Following is the process to synchronize  local time with hwclock by using NTP server.

• ntpdate
• ntpdate <server name>
• check system date by using #date command.
• #hwclock --show : it will display hwclock
• #ntpstat : communicate with ntp server and display time.
• check which time zoemne has mentioned in server  #cat /etc/sysconfig/clock.

                ls -ltr /etc/localtime
                rm -rf /etc/localtime
                ln -s /usr/share/zoneinfo/America/Denver /etc/localtime
                ls -ltr /etc/localtime
      now check hwclock and system date as same.

•          still if you are facing problem,check  /etc/ntp.con file with ntp server details.

how to bring newly added disk under control of LVM ?

#first check all available disks: fdisk -l
#check pvs and lvs
#create disk partition using : fdisk /dev/sdb
#create physical volume : pvcreate /dev/sdb1
#create volume group : vgcreate mysql_vg /dev/sdb1
#create logical volume : lvcreate -L 20G -n datavol mysql_vg
#make a file system : mkfs.ext4 -m 2 /dev/mysql_vg/datavol
#create a mount point 
#mount the Partition : mount /dev/mysql_vg/datavol  <mount point>  

how to scan LUNS in LINUX with out rebooting server?

first check busing fdisk -l command.
if new luns has not detected.before that take lun id from storage team.it is easy to identify lun.

#powemt config
Assuming that there are two hbas, numbered 0 and 1 :-

echo "- - -" > /sys/class/scsi_host/host0/scan

echo "- - -" > /sys/class/scsi_host/host1/scan

#echo "1" > /sys/class/fc_host/host0/issue_lip
#echo "1" > /sys/class/fc_host/host1/issue_lip
then,

powermt display dev=all | grep "Pseudo"

powermt display dev=all | grep "Logical device"
we can check with lun id provided by storage team.

how to remove logical volume form LVM

unmount the partation : umount  <mount point>

remove logical volume : lvremove <lv name>

check with lvdisplay command,to check status.

vgremove <vg name > : remove volume group

pvremove /dev/sdb1 : remove physical volume

fdsik -l : check the physical partations.