Category: libvirt / KVM


Cat a number of files and want to know which file it is working on?

Filed Under: libvirt / KVM, Linux, OS, virtualization by Jason L Froebe — Leave a comment
November 28, 2011

In the following example, I have 21 files that came from a raw partition that I split at 10GB intervals. I am piping that to parallel bzip2 (pbzip2) and writing it to a raw partition (logical volume).

 cat /mnt/DBADEV1/DBADEV1.disk.bz2.00 /mnt/DBADEV1/DBADEV1.disk.bz2.01 /mnt/DBADEV1/DBADEV1.disk.bz2.02 /mnt/DBADEV1/DBADEV1.disk.bz2.03 /mnt/DBADEV1/DBADEV1.disk.bz2.04 /mnt/DBADEV1/DBADEV1.disk.bz2.05 /mnt/DBADEV1/DBADEV1.disk.bz2.06 /mnt/DBADEV1/DBADEV1.disk.bz2.07 /mnt/DBADEV1/DBADEV1.disk.bz2.08 /mnt/DBADEV1/DBADEV1.disk.bz2.09 /mnt/DBADEV1/DBADEV1.disk.bz2.10 /mnt/DBADEV1/DBADEV1.disk.bz2.11 /mnt/DBADEV1/DBADEV1.disk.bz2.12 /mnt/DBADEV1/DBADEV1.disk.bz2.13 /mnt/DBADEV1/DBADEV1.disk.bz2.14 /mnt/DBADEV1/DBADEV1.disk.bz2.15 /mnt/DBADEV1/DBADEV1.disk.bz2.16 /mnt/DBADEV1/DBADEV1.disk.bz2.17 /mnt/DBADEV1/DBADEV1.disk.bz2.18 /mnt/DBADEV1/DBADEV1.disk.bz2.19 /mnt/DBADEV1/DBADEV1.disk.bz2.20 | pbzip2 -dcv -p4 > /dev/mapper/VG_VMH1-LV_DBADEV1

Output:

Parallel BZIP2 v1.0.5 – by: Jeff Gilchrist [http://compression.ca]
[Jan. 08, 2009]             (uses libbzip2 by Julian Seward)

         # CPUs: 4
——————————————-
         File #: 1 of 1
     Input Name:
    Output Name:

 BWT Block Size: 900k
Decompressing data (no threads)…

This will take a while, so let’s determine which file it is currently working on:

$ lsof|grep DBADEV1
cat       24137      root    3r      REG                8,1   10737418240         80 /mnt/DBADEV1/DBADEV1.disk.bz2.07

Oh boy, it’s only on file #8. oh well, we can watch it a little easier with the “watch” command set to run the lsof command every 5 seconds:

watch -n5 ‘lsof|grep DBADEV1′
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Libvirt/KVM best practices

Filed Under: libvirt / KVM, Linux, OS, virtualization by Jason L Froebe — Leave a comment
November 28, 2011

For those of you that are thinking about using using libvirt/kvm on Linux… here is a discussion on proposed best practices

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KVM: virsh and virt-top

Filed Under: libvirt / KVM, Linux, OS, virtualization by Jason L Froebe — Leave a comment
November 28, 2011

little annoyed that setting a ‘default’ connect string with virt-top and virsh is different:

virsh uses the environment variable VIRSH_DEFAULT_CONNECT_URI
export VIRSH_DEFAULT_CONNECT_URI=’qemu:///system’

virt-top uses the config file .virt-toprc
connect qemu:///system

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KVM: Virtual Bridge (virbr0) is NOT needed! I show you how to remove it :)

Filed Under: libvirt / KVM, Linux, OS, virtualization by Jason L Froebe — Leave a comment
November 28, 2011

for KVM, using an actual network bridge is desired for performance over NAT. There is a virtual bridge used by XEN (virbr0) that you won’t need.
To disable it:

$ virsh net-destroy default
$ virsh net-undefine default

# If Redhat based distro:
$ service libvirt-bin stop
# if Debian/Ubuntu based distro:
$ service libvirtd restart  

$ ifconfig
 

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