[ovirt-users] Re: qemu-guest-agent on Ubuntu doesn't report FQDN

Hello Yedidyah, thank you for this great answer. I will answer in the text below. BR Florian ----- Ursprüngliche Mail ----- Von: "Yedidyah Bar David" <didi(a)redhat.com&gt; An: "Florian Schmid" <fschmid(a)ubimet.com&gt; CC: "Tomas Golembiovsky" <tgolembi(a)redhat.com&gt;, "Sandro Bonazzola" <sbonazzo(a)redhat.com&gt;, "users" <users(a)ovirt.org&gt; Gesendet: Donnerstag, 23. Juli 2020 08:37:21 Betreff: Re: [ovirt-users] Re: qemu-guest-agent on Ubuntu doesn't report FQDN On Wed, Jul 22, 2020 at 5:34 PM Florian Schmid via Users <users(a)ovirt.org&gt; wrote: >> >> Hi, >> >> after digging a bit deeper, it looks like it is the problem with the qemu-guest-agent. >> >> It does only report the hostname and nothing more. It uses this function: g_get_host_name () >> >> This function always returns the value in /etc/hostname and this is normally the short name of the VM without the domain part. >> >> It looks like, that the ovirt-guest-agent made this different, > >Indeed, and from checking the git log, it seems like it did this since >the very first commit - already then, >ovirt-guest-agent/GuestAgentLinux2.py had: > def getMachineName(self): > return socket.getfqdn() Correct, this is what I wanted back. > >> but this is not working anymore with python 3. > >If in "this" you refer to ovirt-guest-agent, then it's deprecated: > >https://bugzilla.redhat.com/show_bug.cgi?id=1672732 Yes, I know. Now using the QGA with oVirt 4.3 reports only the short hostname. > >> >> There was a recent patch for qga -> https://bugzilla.redhat.com/show_bug.cgi?id=1845127 > >This bug seems to discuss something else, not directly related to your >own issue. > >> but this won't help me, because even when this patch would add the FQDN to oVirt back, there won't be a package for this for Ubuntu 20.04 and probably also not for RedHat/CentOS 8. > >Not sure what you mean here. The bug is on qga, and fixing it (or your >own issue) is unrelated to oga's deprecation. I wanted to say, that this change might also impact the reported hostname, but I don't think so... > >Your issue seems to be, to me: > >1. oga used to report the FQDN, as returned by python's socket.getfqdn() >2. qga returns something else (and this something else might be >changed, following above bug, but likely not to what you want). >3. oVirt now uses qga instead of oga, thus changing its past behavior. >4. You want the old behavior back - basically, claiming this is a regression. Yes, exactly. > >If so, then: > >1. You are welcome to open a bug about this, on qga. >2. Your request *might* be rejected, on the ground of breaking >compatibility for existing/old users of qga (say, using virt-manager >or whatever other virt tool, without oga installed) I'm 100 % sure, that they will reject this. > >Alternatively, or if this bug is rejected, you can open two new bugs: > >1. one on qga, to provide the fqdn (using, hopefully, logic similar to >python's getfqdn, although qga is written in C) Possible, but this won't help me a lot, because even if they add a new function to qga, oVirt would need to be changed too, to access this function instead of the one it is using now. >2. other on the oVirt engine, to use this new functionality of qga >instead of the existing one. Yes. > >You also have another alternative - just adapt your machines to have >the fqdn as the hostname. I personally think this is the best way to >go. Have 'hostname' return the FQDN you want, and only use 'hostname >-s' where you really want it to be short. How do you set the hostnames >of your machines? This is what I don't know, if this has some drawbacks. I have checked this on internet, but haven't find a lot about it, what is digging deeper. Maybe someone here has some experience with using FQDN for hostname?

I can live with such a solution, when it doesn't have big drawbacks...