similar to: Networking in KVM

<div style="FONT-FAMILY: Arial; COLOR: rgb(0, 0, 0); FONT-SIZE: 12px"><div>Thanks, I followed the 2nd article, and it got the existing virtual machines communicating with each other.<br /><br />However, any new virtual machines I created after making the changes can't communicate with anything, they can't even get out to the internet, even if I manually

Hi all, I use virt-manager as a way to give customers direct access to their (virtual) servers. This is important for things like OS installs or when do admin work where the network is down. This means I have to install a little linux machine though as none of my clients are linux shops. So I got to wondering; If I understand, virt-manager is more or less a hypervisor-aware VNC client,

> I'm guessing you're using standard 7,200rpm platter drives? You'll need > to share more information about your environment in order for us to > provide useful feedback. Usually though, the answer is 'caching' and/or > 'faster disks'. Yes , 7.2k rpm disks. 2T mirror (soft). In fact, I had such a preference for slightly more capacity. Unfortunately very

Almost exactly two years ago, I released the first tutorial for building an HA platform for KVM VMs. In that time, I have learned a lot, created some tools to simplify management and refined the design to handle corner-cases seen in the field. Today, the culmination of that learning is summed up in the "2nd Edition" of that tutorial, now called "AN!Cluster Tutorial 2".

Hello I use KVM. In a virtual machine "jbd2 dm-0" disk I / O is very increases. It consumes up to 99%. For this reason, slowing down the other virtual machine. What should I do to solve the problem. ? Thanks..

> If you run top what are you seeing on the %Cpu(s) line? %20 On Mon, Feb 8, 2016 at 9:30 PM, Alvin Starr <alvin at netvel.net> wrote: > Slow disks will show up as higher I/Owait times. > If your seeing 99% cpu usage then your likely looking at some other problem. > > If you run top what are you seeing on the %Cpu(s) line? > > > On 02/08/2016 02:20 PM, Gokan Atmaca

Paul, On Thu, Mar 17, 2016 at 5:47 PM, Digimer <lists at alteeve.ca> wrote: > On 17/03/16 04:47 PM, paul.greene.va at verizon.net wrote: > > Thanks, I followed the 2nd article, and it got the existing virtual > > machines communicating with each other. > Right, so your VMs are on the same bridge group now (at Layer2 of OSI). > > > > However, any new

On Tue, Dec 15, 2015 at 6:36 PM, Digimer <lists at alteeve.ca> wrote: > On 15/12/15 10:17 AM, Traiano Welcome wrote: >> Hi All >> >> Is it possible to upgrade from CentOS 6.7 to CentOS 7? >> >> I see there is some attempt at an upgrade tool available, but it's >> apparently broken: >> >>

On 12-03-2015 17:39, Digimer wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > On 12/03/15 04:29 PM, Gilbert Sebenste wrote: >> Hello everyone, >> >> A network engineer buddy of mine brought up for discussion with me >> that he'd like to do some throughput testing, but he's new to >> Linux/RedHat. Is there any software I can recommend to

Hi, I have two KVM hosts (CentOS 7) and would like them to operate as High Availability servers, automatically migrating guests when one of the hosts goes down. My question is: Is this even possible? All the documentation for HA that I've found appears to not do this. Am I missing something? My configuration so fare includes: * SAN Storage Volumes for raw device mappings for guest vms

Hi all. We've got a lot of customers running CentOS 5 and 6 servers. We've been asked by many to provide backup, which is something we don't want to do in house. So we started looking for backup companies to partner with. The problem is that the ones we've found who support RHEL won't support CentOS. So does anyone know of an online backup company that _will_

I had so much trouble putting Centos 6 guest VMs on a Centos 5 host that I finally switched to a Centos 6 host. I've not needed more that test VMs, so I've used Virtual Machine Manager on the old system, which worked pretty well, so I decided to create my first KVM guest machine. I noticed when I created it, I only had the options of NAT for my network interface, so I used that

Once upon a time, Digimer <lists at alteeve.ca> said: > The cluster software and any hosted services aren't running. It's not > that they think they're wrong, they just have no existing state so they > won't try to touch anything without first ensuring it is safe to do so. Well, I was being short; what I meant was, in HA, if you aren't known to be right, you are

Hi all, I'm happy to announce a new tutorial! https://alteeve.com/w/2-Node_Red_Hat_KVM_Cluster_Tutorial This tutorial walks a user through the entire process of building a 2-Node cluster for making KVM virtual machines highly available. It uses Red Hat Cluster services v3 and DRBD 8.3.12. It is written such that you can use entirely free or fully Red Hat supported environments.

Hi all, I'm happy to announce a new tutorial! https://alteeve.com/w/2-Node_Red_Hat_KVM_Cluster_Tutorial This tutorial walks a user through the entire process of building a 2-Node cluster for making KVM virtual machines highly available. It uses Red Hat Cluster services v3 and DRBD 8.3.12. It is written such that you can use entirely free or fully Red Hat supported environments.

Hi all, I was trying to rebuild mtr (http://vault.centos.org/6.7/os/Source/SPackages/mtr-0.75-5.el6.src.rpm) and I keep getting: ==== Executing(%install): /bin/sh -e /var/tmp/rpm-tmp.gu9Ds0 + umask 022 + cd /root/rpmbuild/BUILD + '[' /root/rpmbuild/BUILDROOT/mtr-0.75-5.el6.x86_64 '!=' / ']' + rm -rf /root/rpmbuild/BUILDROOT/mtr-0.75-5.el6.x86_64 ++ dirname

I have done what you said and I restarted centos7. It still goes into graph mode automatically. So what is the step I can do to go into text mode automatically? 2015-03-19 12:03 GMT-07:00 Digimer <lists at alteeve.ca>: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > Try: > > plymouth-set-default-theme --list > > You should see 'text' and

Hi all, For development reasons, I've setup a pair of VMs (host is Fedora 22) running EL6 as an HA cluster. On these two nodes, I host a 3rd VM (so Fedora 22 -> 2x EL 6.7 -> El 6.7). Currently, 'EL' == CentOS, but I can switch to RHEL proper if need be. To my happy surprise, it actually works! Of course, the two-deep EL6 guest is slow as molasses. I don't really care

Once upon a time, John R Pierce <pierce at hogranch.com> said: > On 6/22/2016 10:47 AM, Digimer wrote: > >This is called "fabric fencing" and was originally the only supported > >option in the very early days of HA. It has fallen out of favour for > >several reasons, but it does still work fine. The main issues is that it > >leaves the node in an unclean

Is there a utility to zero unused blocks on a disk? CentOS 6.7/Ext4 I saw zerofree, but I?m not sure it would work on Ext4 or even work on this version of CentOS. thanks, -wes