RHCSA RHEL 8 - Manage Layered Storage (Stratis)
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This video is based on RHEL 8.
Video to cover the section 'Manage Layered Storage' for the RHCSA (Red Hat Certified System Administrator).
More information on the required learning: http://bit.ly/rhcsa8
Notes from the video (also can be found on my website):
https://csg.tech.blog/2020/02/10/rhcs...
Stratis is a local management storage solution added into RHEL8. Stratis supports the following features:
Thin provisioning (allocating space but not reserving it).
Pool-based storage (multiple block devices to a single pool).
Filesystem snapshots
To install Stratis:
dnf install stratisd stratis-cli
Check status of the daemon:
systemctl status stratisd
Start:
systemctl start stratisd
Enable at boot:
systemctl enable stratisd
Then check the status of the daemon to ensure is running using the status command.
Creating a stratis pool:
Check the existing block devices (here we have already created /dev/sdb and /dev/sdc).
lsblk
Confirm the block devices have no filesystem on them:
blkid -p /dev/sdb
blkid -p /dev/sdc
If have a filesystem wipe with the following:
wipefs -a /dev/sdb
wipefs -a /dev/sdc
Create the stratis pool:
stratis pool create strat1 /dev/sdb /dev/sdc
Check the pool is created successfully:
stratis pool list
Create a filesystem on the newly created pool:
stratis fs create stratis fs1
Check the filesystem has been created successfully:
stratis fs list strat1
You can see the block devices created:
lsblk
Mounting the newly created filesystem:
mount /stratis/strat1/fs1 /mnt
You can use fstab to mount permanently, you can get the UUID required from the lsblk command above. Use the instructions from previous videos.
Add a block device to a stratis pool:
stratis pool add-data strat1 /dev/sdd
Check the stratis pool change:
stratis pool list
Create a stratis filesystem snapshot:
stratis fs snapshot strat1 fs1 snapshot1
Confirm the snapshot has been created:
stratis filesystem list strat1
Revert a snapshot:
umount /stratis/strat1/fs1
Snapshot the current filesystem state:
stratis filesystem snapshot strat1 fs1 snapshot2
Mount the snapshot:
mount /stratis/strat1/snapshot1
Remove a snapshot:
umount /stratis/strat1/snapshot1
stratis filesystem destroy strat1 snapshot1
stratis filesystem destroy strat1 snapshot2
List the filesystem to confirm the removal:
stratis filesystem list strat1
Remove a stratis pool:
umount /stratis/strat1/fs1
stratis filesystem destroy strat1 fs1
Confirm removal:
stratis pool list
lsblk
#rhcsa #rhel #linux