OpenShift Virtualization testing—VM snapshots

[computate]

Motivation

The ability to create and manage VM snapshots of virtual machines, allowing to easily revert to previous states.
This is essential for ensuring data safety, enabling rollback after updates, and supporting test and development use cases.

Completion Criteria

• Users are able to create snapshots of the virtual machines.
• Users are able to revert to previous snapshots efficient and without data loss.
• Documentation on how to create and manage snapshots is provided.

Description

• [x] Implement the ability to create snapshots for virtual machines in OpenShift Virtualization.
• [x] Implement the ability to revert virtual machines to previously created snapshots.
• [x] Create documentation and provide examples for creating, managing, and reverting snapshots.

Completion dates

Desired - 2024-10-23 Required - TBD

[computate]

I have successfully tested installing postgresql-server on a CentOS Stream 9 image with multiple VM Snapshots along the way:

• base
• yum-install-postgresql-server
• yum-install-postgresql-contrib
• systemctl-start-postgresql
• create-database-computate
• create-table-stuff
• insert-into-stuff

I was able to shutdown the VM, restore to several of these snapshots, restart the VM and see the state of the filesystem at the various snapshots.

[computate]

Here are some steps I did to install a PostgreSQL database for testing the VM.

$ sudo yum install -y postgresql-server postgresql-contrib
$ sudo systemctl start postgresql
$ sudo systemctl enable postgresql

$ sudo -u postgres psql
$ create user test password '...';
$ create database test owner test;
$ create table test(pk bigserial primary key, id text unique, val text);

$ postgres=# insert into test(id, val) values('best-linux-flavor', 'rhel9');
INSERT 0 1
$ postgres=# insert into test(id, val) values('best-linux-flavor', 'ubuntu24.04');
ERROR:  duplicate key value violates unique constraint "test_id_key"