Re: [ovirt-users] Recovering oVirt-Engine with a backup before upgrading to 4.2

-----Ursprüngliche Nachricht----- Von: users-bounces(a)ovirt.org [mailto:users-bounces@ovirt.org] Im Auftrag von Sven Achtelik Gesendet: Mittwoch, 28. März 2018 18:28 An: Yedidyah Bar David Cc: users(a)ovirt.org Betreff: Re: [ovirt-users] Recovering oVirt-Engine with a backup before upgrading to 4.2 > -----Ursprüngliche Nachricht----- > Von: Yedidyah Bar David [mailto:didi@redhat.com] > Gesendet: Mittwoch, 28. März 2018 10:06 > An: Sven Achtelik > Cc: users(a)ovirt.org > Betreff: Re: [ovirt-users] Recovering oVirt-Engine with a backup > before upgrading to 4.2 > > On Tue, Mar 27, 2018 at 9:14 PM, Sven Achtelik > <Sven.Achtelik(a)eps.aero&gt; > wrote: > > Hi All, > > > > > > > > I’m still facing issues with my HE engine. Here are the steps that I > > took to end up in this situation: > > > > > > > > - Update Engine from 4.1.7 to 4.1.9 > > > > o That worked as expected > > > > - Automatic Backup of Engine DB in the night > > > > - Upgraded Engine from 4.1.9 to 4.2.1 > > > > o That worked fine > > > > - Noticed Issues with the HA support for HE > > > > o Cause was not having the latest ovirt-ha agent/broker version on hosts > > > > - After updating the first host with the latest packages for the > > Agent/Broker engine was started twice > > > > o As a result the Engine VM Disk was corrupted and there is no Backup of > > the Disk > > > > o There is also no Backup of the Engine DB with version 4.2 > > > > - VM disk was repaired with fsck.ext4, but DB is corrupt > > > > o Can’t restore the Engine DB because the Backup DB from Engine V 4.1 > > > > - Rolled back all changes on Engine VM to 4.1.9 and imported Backup > > > > o Checked for HA VMs to set as disabled and started the Engine > > > > - Login is fine but the Engine is having trouble picking up and > > information from the Hosts > > > > o No information on running VMs or hosts status > > > > - Final Situation > > > > o 2 Hosts have VMs still running and I can’t stop those > > > > o I still have the image of my corrupted Engine VM (v4.2) > > > > > > > > Since there were no major changes after upgrading from 4.1 to 4.2, > > would it be possible to manually restore the 4.1 DB to the 4.2 > > Engine VM to this up and running again or are there modifications > > made to the DB on upgrading that are relevant for this ? > > engine-backup requires restoring to the same version used to take the > backup, with a single exception - on 4.0, it can restore 3.6. > > It's very easy to patch it to allow also 4.1->4.2, search inside it > for "VALID_BACKUP_RESTORE_PAIRS". However, I do not think anyone ever > tested this, so no idea might break. In 3.6->4.0 days, we did have to > fix a few other things, notably apache httpd and iptables->firewalld: > > https://bugzilla.redhat.com/show_bug.cgi?id=1318580 > > > All my work on rolling back to 4.1.9 with the DB restore failed as > > the Engine is not capable of picking up information from the hosts. > > No idea why, but not sure it's related to your restore flow. > > > Lessons learned is to always make a copy/snapshot of the engine VM > > disk before upgrading anything. > > If it's a hosted-engine, this isn't supported - see my reply on the > list ~ 1 hour ago... > > > What are my options on getting > > back to a working environment ? Any help or hint is greatly appreciated. > > Restore again with either methods - what you tried, or patching > engine- backup and restore directly into 4.2 - and if the engine fails > to talk to the hosts, try to debug/fix this. > > If you suspect corruption more severe that just the db, you can > install a fresh engine machine from scratch and restore to it. If it's > a hosted-engine, you'll need to deploy hosted-engine from scratch, > check docs about hosted-engine backup/restore. I read through those documents and it seems that I would need an extra Host/Hardware which I don't have. https://ovirt.org/documentation/self- hosted/chap-Backing_up_and_Restoring_an_EL-Based_Self- Hosted_Environment/ So how would I be able to get a new setup working when I would like to use the Engine-VM-Image ? At this point it sounds like I would have to manually reinstall the machine that is left over and running. I'm lost at this point. > > Best regards, > -- > Didi _______________________________________________ Users mailing list Users(a)ovirt.org http://lists.ovirt.org/mailman/listinfo/users