virt

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2 participants
1612 discussions

domU doesn't see all memory
by sg＠cyon.ch 24 Jan '13

24 Jan '13

Hi, I'm running CentOS 6.2 x86_64 as xen guest on a CentOS 5.7 dom0. The host is running 2.6.18-274.7.1.el5xen, the guest 2.6.32-220.2.1.el6.x86_64. Memory for domU is set to 1024 MB and "xm list" shows these 1024 MB. But "free -m" on the guest system shows only 652 MB. When I set up a CentOS 5.x guest with 1024 MB "free -m" shoes 1024 MB. Anyone else seeing this? Any ideas on how to fix it? Cheers, Sebastian

7 8

virt-manager
by mattias 23 Jan '13

23 Jan '13

are there any windows based software to administer an kvm hhost? e.g create edit machines no web based

6 7

Upgrading libvirt and qemu to latest version
by Peter Smith 20 Jan '13

20 Jan '13

Hi, I am considering upgrading the libvirt to v0.10.1 and qemu-kvm to v1.2 qemu version because they are recommended by Ceph. I am wondering does CentOS kernel support upstream qemu well? And are there rpms for theses version somewhere? or I have to build myself? Thanks. Peter

2 1

i solved it
by mattias 18 Jan '13

18 Jan '13

cool i now administer my kvm host from my laptop with virt-manager now i should only figure out how to asign public ips

3 2

virt-manager
by mattias 17 Jan '13

17 Jan '13

can i connect to a libvirt-host over internet? it work with ssh but with tcp?

3 2

create a guest
by mattias 16 Jan '13

16 Jan '13

can i create a guest with libvirt and use an existing disc with freebsd?

4 7

create a guest
by mattias 16 Jan '13

16 Jan '13

can i create a guest with libvirt and use an existing disc with freebsd?

3 4

create a guest
by mattias 16 Jan '13

16 Jan '13

can i create a guest with libvirt and use an existing disc with freebsd?

1 0

xen device mapping/translation
by Luis Fernando Alen 16 Jan '13

16 Jan '13

Hello, list. Yesterday I was pleased to see that Centos has released official images at the aws marketplace. Nice job. Today I started playing with the Centos 6.3 image ( https://aws.amazon.com/marketplace/pp/B00A6L6F9I, on which I plan to deploy a gluster cluster in production soon) and noticed a weird thing. EBS Volumes attached to sd<X> are translated to xvd<Y> at the OS level. However, after a few research and IRC chat, I figured out that it's not weird, it's actually a normal and expected behavior (thanks for your help, z00dax). sdX is actually mapped to xvdX+4. There is a consistent offset of 4. Suppose you attach an ebs volume to /dev/sdf. It'll be translated to xvdj at the OS level. sdg to xvdk, sdh to xvdl and so on. Allright. After having figured the mystery out, it became easy to work on automations that deal with ebs volumes and file systems, such as volumes created, attached and mounted on the fly, snapshots that freeze file systems and so on... However, I really do think to myself: Wouldn't it be cleaner if the image use simple translation (sdX to xvdX)? If I'm not wrong, Rightscale uses this on their Centos images and it's much simpler. There's no extra work needed to deal with that 4 offset when you want to automate things. Is there a reasonable reason for the 4 offset which makes it unchangeable? It's just a thought. I think it's worth considering it.. Luis Alen www.izap.com.br Ligue com tarifa local de todo o Brasil 4020.3000

4 8

kvm
by mattias 16 Jan '13

16 Jan '13

i have installed kvm on centos 6 but how to run it i not use libvirt

2 1

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