linux administration

How to install Vmware tools There are lot of ways this process To follow there are install VMware Tools in a Linux guest operating system using RPM: Ensure that your Linux virtual machine is powered on. If you are running a GUI interface, open a command shell. Click VM in the virtual machine menu, then click Guest > Install/Upgrade Vmware Tools and click OK. To create a mount point, run:  mkdir /mnt/cdrom  (check your system once before do the process) To mount the CDROM, run: mount /dev/cdrom /mnt/cdrom To install VMware Tools using RPM, run:( RPM - package installer) rpm -ivh /mnt/cdrom/VMwareTools-version.rpm( chck once it's available your server or system or not before  do the process or staart the process) Where <version> is the version of VMware Tools you want to install To check the existing version of VMware Tools, use the "cd" command to go to /mnt/cdrom/ directory and list the contents of the director...

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Logical Volume Manager(LVM)- L.V.M(Logical Volume Manager) LVM is a method of allocating harddrive space into logical volumes that can be easily resized instead of partitions. With LVM the harddrive (or) set of harddrives are allocated to one or more physical volumes.  The physical volumes are combined into volume groups  Each volume group is divided into logical volumes which are assigned mountpoints such as /home and filesystem types such as ext3 To configure LVM -Create three LVM partitions -Convert them as physical volumes -Create volume groups from physical volumes -Create logical volumes from volume groups and assign mountpoints Implemention: fdisk -l #fdisk /dev/sda :n +500M :t <partition number> :8e    (Linux LVM) :w   (save & exit) #partx -a /dev/sda (update kernel) To convert LVM partitions as physical volumes #pvcreate /dev/sda<partition numbers> ex: pvcreate /dev/sda{9,10,11} To view physical...

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Disk Partitions or Disk Management- Disk Management  All Existing Disk Partitions Using      fdisk -l fdisk -  command using the partitions you create a new partition, or modify an existing partition, you might want to view all available partition in the system. Use fdisk -l to view all available partitions as shown below.   device info will present under  /dev      ide ------------------   /dev/had     sata------------------   /dev/sda Creating a Partition [root@linuxadmin sysusers]# fdisk   /dev/sda Options-       m – To get  the help      p  -  To print the partition table      n  -  To create a Partition      d – To delete a   Partition      w  -  To save the modification      q  - To quit without save   ...

Job Scheduling- As a system administrator some tasks are respective like backup. monitoring, log files.   To automate them below the commands or keys -at   -batch -crontab Crontab: to run some tasks automatically   to set a crontab for an user #crontab -e -u <user name> * * * * * /bin/echo "hello" A crontab file contains instructions to the cron deamon of the general form   "run this command at this time on this date" Cron examines entries once every minute Time mentioned here  field        allowed values  -----                   --------------  minutes               0-59  hour                  0-23  day of month     1-31  month     ...

Sudo is super user  a concept which is used to specify a customized  privilege commands to non-privileged  users. All sudo configuration is located under /etc/sudoers file.       To edit sudo configuration file use visudo command.             Add users using useradd command                                                  #useradd   sree                                 #useradd   sinu                     ...