Red Hat Enterprise Linux Diagnostics and Troubleshooting

Instructions

1. Log in to servera and switch to the root user.

   [student@workstation ~]$ ssh student@servera
   ...output omitted...
   [student@servera ~]$ sudo -i
   [sudo] password for student: student
   [root@servera ~]#

2. Install and enable the Stratis service.

   1. Install the stratisd and stratis-cli packages.

      [root@servera ~]# yum install stratisd stratis-cli

   2. Ensure that the stratisd service is enabled.

      [root@servera ~]# systemctl enable --now stratisd

3. Create a Stratis pool named my-pool that consists of the /dev/vdb and /dev/vdc devices.

   1. Wipe devices from any file system, partition table, or RAID signatures.

      [root@servera ~]# wipefs --all /dev/vdb /dev/vdc

   2. Create a Stratis pool.

      [root@servera ~]# stratis pool create my-pool /dev/vdb /dev/vdc

   3. Verify the Stratis pool.

      [root@servera ~]# stratis blockdev
      Pool Name   Device Node   Physical Size   Tier
      my-pool     /dev/vdb              1 GiB   Data
      my-pool     /dev/vdc              1 GiB   Data
      [root@servera ~]# stratis pool list
      Name                    Total Physical   Properties
      my-pool   2 GiB / 41.63 MiB / 1.96 GiB      ~Ca,~Cr

4. Create the Stratis file system.

   1. Create the file system in the pool.

      [root@servera ~]# stratis fs create my-pool my-fs

   2. Confirm the Stratis file system creation.

      [root@servera ~]# stratis fs list my-pool
      Pool Name Name  Used    Created           Device                     UUID
      my-pool   my-fs 546 MiB Oct 04 2021 23:47 /dev/stratis/my-pool/my-fs b6588...

   3. Create a /test directory and mount the Stratis file system.

      [root@servera ~]# mkdir /test
      [root@servera ~]# mount /dev/stratis/my-pool/my-fs /test

   4. Verify the Stratis file system.

      [root@servera ~]# df -h /test
      Filesystem                                  Size  Used Avail Use% Mounted on
      /dev/mapper/stratis-1-8c1...-thin-fs-b6...  1.0T  7.2G 1017G   1% /test

5. Explore the features of Stratis file systems.

   1. Inspect the file system format type.

      [root@servera ~]# blkid /dev/stratis/my-pool/my-fs
      /dev/stratis/my-pool/my-fs: UUID="b658..." BLOCK_SIZE="512" TYPE="xfs"

   2. Create a snapshot of the file system and verify it.

      [root@servera ~]# stratis fs snapshot my-pool my-fs my-fs-snapshot
      [root@servera ~]# stratis fs
      Pool Name Name           Used    Created           Device                              UUID
      my-pool   my-fs          546 MiB Oct 04 2021 23:47 /dev/stratis/my-pool/my-fs          b6588...
      my-pool   my-fs-snapshot 546 MiB Oct 05 2021 00:33 /dev/stratis/my-pool/my-fs-snapshot 1cf51...

   3. Create a test file and use a snapshot as a file system backup.

      [root@servera ~]# echo "Hello, I am a test file" > /test/mytestfile
      [root@servera ~]# cat /test/mytestfile
      Hello, I am a test file

      Back up the current file system state and verify it.

      [root@servera ~]# stratis filesystem snapshot my-pool my-fs my-fs-backup
      [root@servera ~]# stratis fs
      my-pool my-fs          546 MiB Oct 04 2021 23:47 /dev/stratis/my-pool/my-fs          b6588...
      my-pool my-fs-snapshot 546 MiB Oct 05 2021 00:33 /dev/stratis/my-pool/my-fs-snapshot 1cf51...
      my-pool my-fs-backup   546 MiB Oct 05 2021 00:39 /dev/stratis/my-pool/my-fs-backup   d25b5...

      Create a /bkp directory and mount the backup file system on it.

      [root@servera ~]# mkdir /bkp
      [root@servera ~]# mount /dev/stratis/my-pool/my-fs-backup /bkp
      [root@servera ~]# df -h /bkp
      Filesystem                                  Size  Used Avail Use% Mounted on
      /dev/mapper/stratis-1-8cc...-thin-fs-d2...  1.0T  7.2G 1017G   1% /bkp
      [root@servera ~]# cat /bkp/mytestfile
      Hello, I am a test file

   4. Use the file system backup to restore the original file system.

      Unmount and destroy the file system.

      [root@servera ~]# umount /dev/stratis/my-pool/my-fs
      [root@servera ~]# stratis filesystem destroy my-pool my-fs
      [root@servera ~]# stratis fs
      Pool Name Name           Used    Created           Device                              UUID
      my-pool   my-fs-snapshot 546 MiB Oct 05 2021 00:33 /dev/stratis/my-pool/my-fs-snapshot 1cf51...
      my-pool   my-fs-backup   546 MiB Oct 05 2021 00:39 /dev/stratis/my-pool/my-fs-backup   d25b5...

      Use the original file system name to back up the my-fs-backup snapshot and mount it on the /test directory. Confirm the restore.

      [root@servera ~]# stratis filesystem snapshot my-pool my-fs-backup my-fs
      [root@servera ~]# stratis fs
      my-pool my-fs-snapshot 546 MiB Oct 05 2021 00:33 /dev/stratis/my-pool/my-fs-snapshot 1cf51...
      my-pool my-fs-backup   546 MiB Oct 05 2021 00:39 /dev/stratis/my-pool/my-fs-backup   d25b5...
      my-pool my-fs          546 MiB Oct 05 2021 00:53 /dev/stratis/my-pool/my-fs          ca12d...
      [root@servera ~]# mount /dev/stratis/my-pool/my-fs /test
      [root@servera ~]# cat /test/mytestfile
      Hello, I am a test file

6. Return to workstation as the student user.

   [root@servera ~]# exit
   [student@servera ~]$ exit
   [student@workstation ~]$