Question : The database server called centos-host is running short on space! You have been asked to add an LVM volume for the Database team using some of the existing disks on this server.
Inspect the requirements in detail by clicking on the icons of the interactive architecture diagram on the right and complete the tasks. Once done click on the Check button to validate your work.
Install the correct packages that will allow the use of
"lvm" on the centos machine.
Create a Physical Volume for "/dev/vdb" &
"/dev/vdc"
Create a volume group called "dba_storage" using
the physical volumes "/dev/vdb" and "/dev/vdc"
Create an "lvm" called "volume_1" from
the volume group called "dba_storage". Make use of the entire space
available in the volume group.
Format the lvm volume "volume_1" as
an "XFS" filesystem
Mount the filesystem at the path
"/mnt/dba_storage".
Make sure that this mount point is persistent
across reboots with the correct default options.
Create a group called "dba_users" and add the user called 'bob' to this group
Ensure that the mountpoint "/mnt/dba_storage" has the group ownership set to the "dba_users" group
Ensure that the mount point
"/mnt/dba_storage" has "read/write" and execute permissions
for the owner and group and no permissions for anyone else
Solution:
1. At first switch to root user and check any existing physical / logical volumes
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[bob@centos-host
~]$ sudo su - [root@centos-host ~]#
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2. Install the correct packages that will allow the use of "lvm" on the centos machine.
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[root@centos-host
~]# yum install -y lvm2 Dependencies
resolved. ===================================================================================================================================================== Package
Architecture Version
Repository Size ===================================================================================================================================================== Installing: lvm2 x86_64 8:2.03.12-10.el8 baseos 1.6 M Upgrading: device-mapper
x86_64
8:1.02.177-10.el8
baseos 377 k device-mapper-libs x86_64 8:1.02.177-10.el8 baseos 409 k Installing
dependencies: device-mapper-event x86_64 8:1.02.177-10.el8 baseos 271 k device-mapper-event-libs x86_64 8:1.02.177-10.el8 baseos 270 k device-mapper-persistent-data x86_64 0.9.0-4.el8 baseos 925 k libaio
x86_64
0.3.112-1.el8
baseos 33 k lvm2-libs
x86_64
8:2.03.12-10.el8
baseos 1.2 M
Transaction
Summary ===================================================================================================================================================== Install 6 Packages Upgraded: device-mapper-8:1.02.177-10.el8.x86_64
device-mapper-libs-8:1.02.177-10.el8.x86_64
Installed:
device-mapper-event-8:1.02.177-10.el8.x86_64
device-mapper-event-libs-8:1.02.177-10.el8.x86_64 device-mapper-persistent-data-0.9.0-4.el8.x86_64
libaio-0.3.112-1.el8.x86_64
lvm2-8:2.03.12-10.el8.x86_64
lvm2-libs-8:2.03.12-10.el8.x86_64
Complete! [root@centos-host ~]# rpm -qa |grep lvm lvm2-libs-2.03.12-10.el8.x86_64 lvm2-2.03.12-10.el8.x86_64 [root@centos-host ~]# |
3. Create a Physical Volume for "/dev/vdb" & "/dev/vdc"
Create a volume group called "dba_storage" using the physical volumes "/dev/vdb" and "/dev/vdc"
Create an "lvm" called "volume_1" from the volume group called "dba_storage". Make use of the entire space available in the volume group.
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[root@centos-host
~]# pvcreate /dev/vdb Physical volume "/dev/vdb"
successfully created. [root@centos-host
~]# pvcreate /dev/vdc Physical volume "/dev/vdc"
successfully created. [root@centos-host
~]# vgcreate dba_storage /dev/vdb /dev/vdc Volume group "dba_storage"
successfully created [root@centos-host
~]# lvcreate -n volume_1 -l 100%FREE dba_storage Logical volume "volume_1"
created. [root@centos-host
~]# pvs PV
VG Fmt Attr PSize PFree /dev/vdb
dba_storage lvm2 a--
1020.00m 0 /dev/vdc
dba_storage lvm2 a--
1020.00m 0 [root@centos-host
~]# lvs LV
VG Attr LSize Pool Origin Data% Meta%
Move Log Cpy%Sync Convert volume_1 dba_storage -wi-a----- 1.99g
[root@centos-host
~]# |
4. Format the lvm volume "volume_1" as an "XFS" filesystem
Mount the filesystem at the path "/mnt/dba_storage".
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[root@centos-host
~]# mkfs.xfs /dev/dba_storage/volume_1 meta-data=/dev/dba_storage/volume_1
isize=512 agcount=4, agsize=130560
blks = sectsz=512 attr=2, projid32bit=1 = crc=1 finobt=1, sparse=1, rmapbt=0 = reflink=1 data = bsize=4096 blocks=522240, imaxpct=25 = sunit=0 swidth=0 blks naming =version 2 bsize=4096 ascii-ci=0, ftype=1 log =internal log bsize=4096 blocks=2560, version=2 = sectsz=512 sunit=0 blks, lazy-count=1 realtime
=none extsz=4096 blocks=0, rtextents=0 [root@centos-host
~]# [root@centos-host
~]# mkdir -p /mnt/dba_storage [root@centos-host
~]# mount -t xfs /dev/dba_storage/volume_1 /mnt/dba_storage [root@centos-host
~]# df -h /mnt/dba_storage/ Filesystem Size Used Avail Use% Mounted on /dev/mapper/dba_storage-volume_1 2.0G
47M 2.0G 3% /mnt/dba_storage [root@centos-host
~]# |
5. Make sure that this mount point is persistent across reboots with the correct default options.
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[root@centos-host
~]# vi /etc/fstab [root@centos-host
~]# cat /etc/fstab # /etc/fstab # Created by
anaconda on Fri Dec 4 17:37:32 2020 # # Accessible
filesystems, by reference, are maintained under '/dev/disk/'. # See man pages
fstab(5), findfs(8), mount(8) and/or blkid(8) for more info. # # After editing
this file, run 'systemctl daemon-reload' to update systemd # units
generated from this file. # UUID=a62c5b49-755e-41b0-9d36-de3d95e17232
/ xfs defaults 0 0 /swapfile none
swap defaults 0 0 /dev/mapper/dba_storage-volume_1
/mnt/dba_storage xfs defaults 0 0 #VAGRANT-BEGIN # The contents
below are automatically generated by Vagrant. Do not modify. #VAGRANT-END [root@centos-host
~]# |
6. Create a group called "dba_users" and add the user called 'bob' to this group
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[root@centos-host
~]# groupadd dba_users [root@centos-host
~]# usermod -G dba_users bob [root@centos-host
~]# id bob uid=1002(bob)
gid=1002(bob) groups=1002(bob),1003(dba_users) [root@centos-host
~]# |
Ensure that the mount point "/mnt/dba_storage" has "read/write" and execute permissions for the owner and group and no permissions for anyone else.
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[root@centos-host
~]# ll -lsd /mnt/dba_storage/ 0 drwxr-xr-x. 2
root root 6 Nov 10 14:29 /mnt/dba_storage/ [root@centos-host
~]# [root@centos-host
~]# chown :dba_users /mnt/dba_storage [root@centos-host
~]# [root@centos-host
~]# ll -lsd /mnt/dba_storage/ 0 drwxr-xr-x. 2
root dba_users 6 Nov 10 14:29 /mnt/dba_storage/ [root@centos-host
~]# [root@centos-host
~]# chmod 770 /mnt/dba_storage [root@centos-host
~]# ll -lsd /mnt/dba_storage/ 0 drwxrwx---. 2
root dba_users 6 Nov 10 14:29 /mnt/dba_storage/ [root@centos-host
~]# |
8. Click on Finish & Confirm to complete the task successfully
Script that automate the entire lab task
you can copy form gitlab https://gitlab.com/nb-tech-support/devops.git
Happy Learning!!!!
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