Thanks, I should have been clearer, what I meant was could you install 4.3.5 and restore to that, then run engine-setup --offline?

Regards, Paul S. ________________________________ From: Yedidyah Bar David <didi(a)redhat.com&gt; Sent: 11 November 2019 10:19 To: Staniforth, Paul <P.Staniforth(a)leedsbeckett.ac.uk&gt; Cc: wangyu13476969128(a)126.com <wangyu13476969128(a)126.com>; users <users(a)ovirt.org&gt; Subject: Re: [ovirt-users] Re: After importing the ovirt-engine 4.3.5 backup file into ovirt-engine 4.3.6, will the information of the ovirt-engine 4.3.6 management interface be the same as ovirt-engine 4.3.5? On Mon, Nov 11, 2019 at 12:12 PM Staniforth, Paul <P.Staniforth(a)leedsbeckett.ac.uk&gt; wrote: > > I haven't tried it but doesn't engine-setup --offline stop it upgrading minor releases. It prevents only the packager component. If you already have 4.3.6 installed, which was the original question, then engine-setup will still update the database schema. And if it didn't, the 4.3.6 engine might fail working correctly with a 3.4.5.5 database. In particular: The documentation for engine-backup always stated that you must run engine-setup immediately after restore. But at some points in time, and under certain conditions, this was actually optional. You could have done a restore, and immediately start the engine, and it would have worked. But this isn't the case if your restored db is older than the installed engine. Then, you must run engine-setup before starting the engine. Best regards, > > Regards, > Paul S. > ________________________________ > From: Yedidyah Bar David <didi(a)redhat.com&gt; > Sent: 11 November 2019 07:57 > To: wangyu13476969128(a)126.com <wangyu13476969128(a)126.com&gt; > Cc: users <users(a)ovirt.org&gt; > Subject: [ovirt-users] Re: After importing the ovirt-engine 4.3.5 backup file into ovirt-engine 4.3.6, will the information of the ovirt-engine 4.3.6 management interface be the same as ovirt-engine 4.3.5? > > On Tue, Oct 29, 2019 at 11:55 AM <wangyu13476969128(a)126.com&gt; wrote: > > > > The current version of ovirt-engine in production environment is 4.3.5.5. > > In order to prevent the ovirt-engine machine from being down, the management interface cannot be used, according to the relevant link: > > https://eur02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fovirt.o... > > > > I backed it up using the command: > > engine-backup --scope=all --mode=backup --file=file_name --log=log_file_name > > > > I have prepared another machine as a spare machine. Once the ovirt-engine is down in the production environment, the standby machine can be UP and the standby machine can manage the ovirt-nodes. > > > > According to the relevant links: > > https://eur02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fovirt.o... > > > > The ovirt-engine is installed on the standby machine. > > > > After I have executed these three commands: > > 1. yum install https://eur02.safelinks.protection.outlook.com/?url=http%3A%2F%2Fresource... > > > > 2. yum update > > > > 3. yum install ovirt-engine > > > > I found that the ovirt-engine version of the standby machine is 4.3.6 > > > > So my question is: > > > > 1. The ovirt-engine version of the standby machine is 4.3.6, and the production environment ovirt-engine version is 4.3.5.5, which command is used on the production environment ovirt-engine machine: > > engine-backup --scope=all --mode=backup --file=file_name --log=log_file_name > > > > Files obtained after using the backup command on the ovirt-engine in the production environment are restored using these two files under the standby computer. Will the information on the ovirt-engine management interface of the standby computer be consistent with the ovirt-engine of the production environment (eg data center, host, virtual machine, etc.)? > > In principle it should be ok. After you restore with above command, > you should run 'engine-setup', and this will update your restored > database schema to 4.3.6. > This is not routinely tested explicitly, though, but I expect that > people often do this, perhaps even unknowingly, when they restore from > a backup taken with a somewhat-old version. > > > > > 2. Can the ovirt-engine of the standby machine be installed with version 4.3.5.5? How do I need to modify the following three commands to get the backup machine to install the version 4.3.5.5? > > 1. yum install https://eur02.safelinks.protection.outlook.com/?url=http%3A%2F%2Fresource... > > 2. yum update > > 3. yum install ovirt-engine > > In theory you can change last one to 'yum install > ovirt-engine-4.3.5.5'. I didn't try that, and you are quite likely to > run into complex dependencies you'll have to satisfy by yourself. > > I think the best solution for you, if you care about active and > standby to be identical, is to upgrade your active one as well, and > keep them same version going forward. > > I'd also like to note that maintaining a standby engine and using it > the way you intend to, is not in the scope of oVirt. People do similar > things, but have to manually work around this and be careful. One very > important issue is that if for any reason you allow both of them to be > up at the same time, and manage the same hosts, they will not know > about each other, and you'll see lots of confusion and errors. > > You might also want to check: > > 1. Hosted-engine setup with more than one host as hosted-engine host. > There, you only have a single engine vm, but it can run on any of your > hosts. You still have a single VM disk/image, and if that's corrupted, > you have no HA and have to somehow reinstall/restore/etc. > > 2. https://eur02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.ovi... > > Best regards, > -- > Didi > _______________________________________________ > Users mailing list -- users(a)ovirt.org > To unsubscribe send an email to users-leave(a)ovirt.org > Privacy Statement: https://eur02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.ovi... > oVirt Code of Conduct: https://eur02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.ovi... > List Archives: https://eur02.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.o... > To view the terms under which this email is distributed, please go to:- > http://leedsbeckett.ac.uk/disclaimer/email/ -- Didi To view the terms under which this email is distributed, please go to:- http://leedsbeckett.ac.uk/disclaimer/email/