search for: rdiez

Hi all: I am using the libvirt version that comes with Ubuntu 18.04.3 LTS. I want to backup a virtual machine in a foolproof way: - Gracefully shutdown the VM. - Backup the disk image. - Restart the VM. I wrote the following script to do that: https://github.com/rdiez/Tools/blob/master/VirtualMachineManager/BackupVm.sh Writing that script was difficult enough because of the virsh limitations (in my opinion) described in the comments. But at least it works. The main problem is that libvirt sets the ownership and permissions of volume files in such a way that a...

...hat comes with Ubuntu 18.04.3 LTS. I have written a script that backs up my virtual machines every night. I want to limit the amount of memory that this backup operation consumes, mainly to prevent page cache thrashing. I have described the Linux page cache thrashing issue in detail here: http://rdiez.shoutwiki.com/wiki/Today%27s_Operating_Systems_are_still_incredibly_brittle#The_Linux_Filesystem_Cache_is_Braindead The VM virtual disk weighs 140 GB at the moment. I thought 500 MiB of RAM should be more than enough to back it up, so I added the following options to the systemd service file asso...

...iver it locally. After all, it is running on the same Dovecot. But it cannot do that, can it? Is there a work-around? I am still hoping that the mail server still works locally if the Internet connection fails. But I would need to learn some Postfix magic for that, would I? Thanks in advance, rdiez

...quot;smart relay"?? You will communicate only via smtp and only with your provider, and you can use a nice open-source bundle ( dovecot is mandatory because you wrote on that list :) ) in your LAN. > > > > > > > > > > ? Original Message > > > From: rdiezmail-2006 at yahoo.de > Sent: October 25, 2020 10:57 AM > To: dovecot at dovecot.org > Subject: Looking for a guide to collect all e-mail from the ISP mail server > > > Hi all: > > I am evaluating mail server solutions for a small business. The trouble is, I am only a part-ti...

...ntication purposes, and running on the same Dovecot server instance, needs to use an MTA to deliver a local message, it is like going out to come back in again. But I do not know much about mail servers yet. Have I missed some important concept here that makes this idea silly indeed? Regards, rdiez

...tten a script that backs up my virtual machines every night. >> I want to limit the amount of memory that this backup operation >> consumes, mainly to prevent page cache thrashing. I have described the >> Linux page cache thrashing issue in detail here: >> >> http://rdiez.shoutwiki.com/wiki/Today%27s_Operating_Systems_are_still_incredibly_brittle#The_Linux_Filesystem_Cache_is_Braindead >> >> >> The VM virtual disk weighs 140 GB at the moment. I thought 500 MiB of >> RAM should be more than enough to back it up, so I added the following &gt...

...ail scenario. I am prepared to learn more and write my own Perl scripts and/or installation guide, but it would be stupid to waste time if something easy already exists. After all, the setup I am describing (external ISP mail server + internal mail server) is not so weird. Thanks in advance, rdiez

Hi all: I have an Ubuntu 18.04 system. What is the easiest way to run all of my virtual machines with a low priority? Say a "nice" level of 15. I just do not want my virtual machines to have too much of an impact in any other processes on the system. Thanks in advance, rdiez

...n, but I did not quite understand it. It talks about vCPUs and how they are scheduled. My guess is that it is all about how those virtual CPUs are scheduled against each other. However, I wanted to lower the priority of all virtual machines against other processes on the host system. Regards, rdiez

...r locally to locals > > Feel free to fill in the details ;) And I thought you guys had nothing else to do, sitting here on the mailing list and pretending to have some mail server skills... So, yes, it does look like I'll have to be the one filling in all the details! 8-) Regards, rdiez

...en with Ubuntu 18.04. And changing XML on all guest VMs is extra work. Is there no other way? For example, are all such virtual machines not some daemon or systemd unit or set of units? Would it be feasible to lower the priority on all of those? Or is that not easy to do either? Thanks again, rdiez

...he trouble is, with that configuration, if the Internet link goes down, internal e-mail stops working too. I was hoping that there would be a complete mail server setup guide somewhere for this kind of setup. But I guess I'll have to piece all these information snippets together. Regards, rdiez

...more than big ones. The idea is that those autoresponders should also work internally. I just learnt that you can install a "Managesieve server" plug-in for forwarding and autoresponders. That would be the way to go then, instead of using the autoresponder at the ISP. Best regards, rdiez

...nes of "I would do it this way, but if you need something professional, I am out of my depth, because I am not actually an admin at all, you know". That's how real life often works. 8-) In other words, I am looking for a workaround.org guide for multidrop. Just for fun! Regards, rdiez

On Thu, May 02, 2019 at 11:33:06AM +0200, Martin Kletzander wrote: > On Wed, May 01, 2019 at 11:58:23AM +0200, R. Diez wrote: > > > > > You would have to set the priority of all vCPUs in each guest, as well > > > as emulator threads in each guest (the latter needs very new libvirt). > > > > This does not seem a viable option then with Ubuntu 18.04. And

...business, I would insist that the e-mail server is not exposed at all on the Internet. A web interface etc. is not a problem: I just connect with a VPN and bypass most external security issues. If you are the admin, you can also forward the web interface over an SSH connection. Best regards, rdiez

...-mails, stored in a different e-mail server, and it would be nice to be able to reorganise them as they are. That way, I could archive the existing older e-mails before migrating to Dovecot, which would reduce the disk size and the export/import time for the migration. Many thanks in advance, rdiez

...ttle detail myself. I'm not promising anything, but I may actually invest the time if I don't find anything else more interesting in the meantime. 8-) In any case, thanks for the hints. I know now what the way to go is. Those pesky port 25 people are not going to get me! ;-) Regards, rdiez

...to do either? > I'm not sure if we're resetting all the cgroup values, so it should be possible by setting this for the machine.slice cgroup (or somewhere around there) which would make it effective for all the VMs, right? I have not tested it, though, sorry. >Thanks again, > rdiez > >_______________________________________________ >libvirt-users mailing list >libvirt-users@redhat.com >https://www.redhat.com/mailman/listinfo/libvirt-users

...ine Manager" GUI. Is there not an easier way? I realised there is a "libvirtd.service" on my system. Is there a simple way in systemd to just lower the priority of everything under that service? I am assuming that this service is starting all the virtual machines. Best regards, rdiez