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Extend the root partition in LVM - CentOS7

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a) Use the following script:
1) Change the extension of the script to .sh. Place this script in /home/compose.
2) Give executable rights chmod +x lvmManagement_Centos7.sh
3) Execute as sudo sh lvmManagement_Centos7.sh
If you do not want to use the script follow the below mentioned steps:
  • ssh to the VM and type "df -h" command to view the partitions and "df -T" for type of partitions.
    image2016-4-22-12-5-29
  • Type "sudo lvs" command to show the logical volumes and volume groups
    image2016-4-22-12-5-29image2016-4-22-12-5-29
  • Type "sudo fdisk -l", here the newely added disk will be visible in /dev/sdb
    image2016-4-22-12-5-29
  • Type "sudo fdisk /dev/sdb" and press the following letters
    Press "n" for new partition
    Press "p" for primary partition
    Press "1" for default value of partition no.
    Let the value of first sector and last sector me deafult
    Press "t" for type of partition
    Press "8e" for the hex code for LVM Partition
    Press "p" to print the value
    Press "w" to write the changes
    image2016-4-22-12-5-29
  • Type "sudo pvcreate /dev/sdb1" to create a new partition
    image2016-4-22-12-5-29
  • Type "sudo vgs"  to find the volume group
  • Use the value of group obtained and type "sudo vgextend cl /dev/sdb1"
    image2016-4-22-12-5-29
  • Type "sudo pvs" and "sudo vgs" to get the partitioned volume and volume group
    image2016-4-22-12-5-29
  • Type "sudo lvextend /dev/cl/root -L +{value of extended partition - 1/2 GBs / MBs} -r" to add the volume
    image2016-4-22-12-5-29
  • Type "df -h" tp see the output of storage, you'll see the that the storage has been extended.
    image2016-4-22-12-5-29
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