From my limited experience, the usual flow for most users is deploying/upgrading a host and installing vdsm from the engine UI on the hypervisor machine.
You are right, for non-hosted-engine hosts. For hosted-engine, at least the first host, you first install stuff on it (including vdsm), then deploy, and only then have an engine. If for any reason you reboot in the middle, you might run into unneeded problems, due to vdsm starting at boot.
In case of manual installations by non-users, it is accustomed to run "vdsm-tool configure --force" after step 3 and then reboot.
I didn't know that, sorry, but would not want to do that either, for hosted-engine. I'd rather hosted-engine deploy to do that, at the right point. Which it does :-)
Having a host on which vdsm is not running by default renders it useless for ovirt, unless it is explicitly set to be down from UI under particular circumstances.
Obviously, for an active host. If it's not active, and is rebooted, not sure we need vdsm to start - even if it's already added/configured/etc (but e.g. put in maintenance). But that's not my question - I don't mind enabling vdsmd as part of host-deploy, so that vdsm would start if a host in maintenance is rebooted. I only ask why it should be enabled by the rpm installation.
On Tue, Jan 28, 2020 at 11:47 AM Yedidyah Bar David <email@example.com
If I do e.g.:
1. Install CentOS
2. yum install ovirt-releaseSOMETHING
3. yum install vdsm
Then reboot the machine, vdsm starts, and for this, it does all kinds of things to the system (such as configure various services using vdsm-tool etc.). Are we sure we want/need this? Why would we want vdsm configured/running at all at this stage, before being added to an engine?
In particular, if (especially during development) we have a bug in this configuration process, and then fix it, it might not be enough to upgrade vdsm - the tooling will then also have to fix the changes done by the buggy previous version, or require a full machine reinstall.
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