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| Alexey_ | Ваше здоровье! 🍺 | 15:07 |
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| lotuspsychj3 | !english | Alexey_ | 15:19 |
| ubottu | Alexey_: The main Ubuntu IRC channels are English only. For a complete list of channels in other languages, please visit https://wiki.ubuntu.com/IRC/ChannelList | 15:19 |
| === kostkon_ is now known as kostkon | ||
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| pvh_sa | Hey there... I have a 22.04 server (recently upgrade) that is hosting some VMs using libxl (Xen driver) in libvirt - trying to start a VM fails with "Failed to balloon domain0 memory" - does anyone know what this means and how to fix it? | 18:33 |
| ChmEarl | pvh_sa, its usually the xen hypervisor cmdline lacks max in dom0_mem= | 18:36 |
| pvh_sa | thanks! let me look into that | 18:37 |
| ChmEarl | see the hypervisor lines in /etc/default/grub | 18:37 |
| ChmEarl | GRUB_CMDLINE_XEN_DEFAULT= | 18:38 |
| pvh_sa | ok - so this is going to be the max RAM that all VMs can consume (together)? | 18:39 |
| pvh_sa | or... the max memory used for the host? | 18:39 |
| ChmEarl | max for host | 18:41 |
| pvh_sa | ok let me carve off 16 GB for that and leave the rest for VMs. I'm just using this machine for a few legacy VMs (the main stuff is over on OpenStack) | 18:42 |
| pvh_sa | so reading some docs... Xen guests also have access to the balloon device to negotiate memory dynamically | 18:45 |
| ChmEarl | pvh_sa, mine has: dom0_mem=4096M,max:4096M | 18:46 |
| pvh_sa | so the Xen hypervisor (dom0) runs in 4GB? | 18:47 |
| ChmEarl | so that any VM balloon won't hurt my dom0 | 18:47 |
| ChmEarl | it can be much lower, like 1024M | 18:47 |
| ChmEarl | pvh_sa, sudo xl dmesg | grep Command | 19:00 |
| ChmEarl | shows hypervisor cmdline | 19:01 |
| pvh_sa | thanks... that resolved the balloon error - now its giving "libxenlight failed to create new domain" - the libxl log is saying "libxl__get_domid: failed to get own domid" | 19:09 |
| pvh_sa | I see others found this was related to stale config - https://askubuntu.com/questions/1239384/xen-cannot-start-domains-after-upgrading-from-18-04-to-20-04 | 19:10 |
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