[ovirt-users] Re: Strategy to Mange Ovirt VMs Created from Templates
Hello Jeremy,
we did this kind of workflow:
- create a standard base image, with all the required updates you
want. We usually started from the previous template of the same RHEL
release, but you can start from scratch every time if you want.
- Install cloud-init that starts at boot and then, after the first
successful execution, disables itself.
- a ssh key for ansible to allow login as root without password. This
key will be then removed after deployment is completed.
- create this new template as new version of the existing RHEL
template (RHEL 7 as example)
At deploy time with ansible:
- deploy a new vm starting from the latest template of RHEL7. Use
run_once cloudinit details for setting ip address. The vm has to be
connected to the right virtual network.
- wait_for vm to be reachable via network
- proceed with ansible to configure/install the remaining parts
(authentication, monitoring agents, backup utilities).
Luca
On Mon, Dec 23, 2019 at 4:20 PM <jeremy_tourville(a)hotmail.com> wrote:
I want to be able to manage VMs using Ansible. As part of the template creation process
it says to seal the VM. Can someone tell me what sealing does to a Linux VM? I
understand it removes some of things that make the VM unique but no real specifics.
So, if I want to manage a VM created from a template would this general process work?-
Seal the VM
Install CloudInit and keys, accounts, etc
Shut off VM and create template from it.
Create new VM using Ansbile & CloudInit
CloudInit would have just enough info so that you could manage the VM with Ansible.
Would that work?
I am just starting to explore what CloudInit can do and what it is. I am brand new to
it. I didn't find enough info on template sealing to help me devise a full cycle
management strategy. Perhaps there are other/easier methods? Thanks for your advice and
input.
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Luca 'remix_tj' Lorenzetto, http://www.remixtj.net ,
<lorenzetto.luca(a)gmail.com>