10:47 a.m.
On Fri, Jun 12, 2020 at 9:23 AM Florian Schmid via Users <users(a)ovirt.org>
wrote:
Hi,
we are using cloud-init for several years now and it looks like, that
cloud-init needs a config for every boot, otherwise, it will use the
default network config, which is DHCP.
We come around this issue by adding this file:
cat /etc/cloud/cloud.cfg.d/99-disable-network-config.cfg
network: {config: disabled}
by cloud-init itself on the first run.
With this, cloud-init creates only once the network config and never
touches it again.
I would not completely disable cloud-init, because this could also have
some drawbacks, like not being able to create a root/user password anymore,
if on worst case, ssh is not working anymore...
What we also fix on the first boot is the datasource_list
-> datasource_list: ["NoCloud", "ConfigDrive"]
Otherwise, we have an extremely long boot process (up to 5 minutes or so),
because cloud-init tries to reach several cloud-config URLs.
BR Florian
----- Ursprüngliche Mail -----
Von: "Jp" <justin.obfuscate(a)gmail.com>
An: "users" <users(a)ovirt.org>
Gesendet: Donnerstag, 11. Juni 2020 16:54:31
Betreff: [ovirt-users] Re: cloud-init: reverts on reboot
I re-read the docs on creating VMs.
What is the difference between the Run Once w/ it's pop-up form vs the
Initial Run with it's embedded form?
From an engine point of view it's quite a difference, run once creates a
one-time configuration to start the VM with and then roll back to the
existing.
As for cloud-init, when you set it in the Edit VM, initial run (without
run-once), on the first time you will run the VM in your environment(first
boot for that VM in your environment), cloud-init will use it.
While, on run-once, it will use the configuration again.
If an (updated) doc were to have a sequential workflow for using
cloud-init in oVirt for a new VM's setup, would it look like this:
* assume cloud-init already installed, ex. Glance image; so
SysPre/Cloud-Init process already done*
Glance Image Method
1. Import Image + Create Template
2. Create VM (_don't_ use Run; and _don't_ populate Initial Run tab)
3. start VM with Run Once (_not_ Run)
4. fill out Run Once pop-up form
5. VM boots as usual
6. remote Console/shell into VM to verify setting
7. Reboot or Shutdown/Run
8. use cloud-init'd VM like any other non-cloud-init'd VM
That ^ look right?
I don't really understand point 8. But from at 5 the VM should consume the
cloud-init configuration and it should stay in the VM.
You may try and reconfigure if you use run-once again, setting cloud-init
configuration again.
It looks OK.
Is CentOS8.2 out? I checked blog.centos.org but it looks like they
had
build issues to still resolve as of last week ...
I'm not sure about centos8.2, adding +Sandro Bonazzola <sbonazzo(a)redhat.com>
.
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