I know that a robust API is provided for performing VM backup functions, but it seems crazy to me that oVirt has not implemented a simple method to backup VM to a storage domain such as an NFS export domain. Is this functionality being left out for a reason (perhaps not wanting to step on toes of 3rd party software vendors providing backup solutions for oVirt/RHEV)?
On Mon, May 13, 2019 at 11:21 AM Gianluca Cecchi <gianluca.cec...@gmail.com> wrote: > On Mon, May 13, 2019 at 3:47 PM Derek Atkins <de...@ihtfp.com> wrote: > >> Strahil <hunter86...@yahoo.com> writes: >> >> > Another option is to create a snapshot, backup the snapahot and merge >> > the disks (delete the snapshot actually). >> > Sadly that option doesn't work with Databases, as you might inyerrupt >> > a transaction and leave the DB in inconsistent state. >> >> Yet another reason to do it from inside the VM. >> > > Actually doable, depending on DB architecture and if some > "logging/archiviing" supported/enabled on database. > See here related threads where I was involved: > > https://lists.ovirt.org/archives/list/users@ovirt.org/message/LJFQOLIWU224R2KE35VGHYXZFL6GZK4R/ > and here: > > https://lists.ovirt.org/archives/list/users@ovirt.org/thread/J65N7E2PY3KWUCZE2OGFVCKKWXKFDSRI/ > > When you install qemu-guest-agent (in my case > version 0.12.1.2-2.506.el6_10.1) you also get an example for MySQL in > /usr/share/qemu-kvm/qemu-ga/fsfreeze-hook.d/mysql-flush.sh.sample > and eventually updated code (actually I see it is dated 2013...) here: > > https://github.com/guillon/qemu-plugins/blob/master/scripts/qemu-guest-agent/fsfreeze-hook.d/mysql-flush.sh.sample > > In case of PostgreSQL you would need to have WAL enabled and do an > Exclusive Low Level Backup, because the pre-snapshot and post-snapshot > could not be inside the same RDBMS session connection: > > https://www.postgresql.org/docs/10/continuous-archiving.html#BACKUP-BASE-BACKUP > > so the freeze option of your freeze-hook script would contain a call to a > connection that runs > SELECT pg_start_backup('label', true); > to minimize time to do checkpoint > > and the thaw option would contain > SELECT pg_stop_backup(); > > This needs also that archives during the elapsed of backup (and the last > generaed when stopping backup) are copied in some way externally in respect > of the VM OS for complete recoverability, if you don't already have it for > your standard archiving policy. > > And thoroughly test the whole workflow, both backups and restores, > especially when upgrading your software layers, oVirt, VM OS, PostgreSQL.... > > HIH, > Gianluca > _______________________________________________ > Users mailing list -- users@ovirt.org > To unsubscribe send an email to users-le...@ovirt.org > Privacy Statement: https://www.ovirt.org/site/privacy-policy/ > oVirt Code of Conduct: > https://www.ovirt.org/community/about/community-guidelines/ > List Archives: > https://lists.ovirt.org/archives/list/users@ovirt.org/message/2RAVXSCEPPCWLSQI4DAU6D6A2G2QBZBB/ >
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