[libvirt-users] removing virbr0
I am building a custom Linux image which includes KVM and will be installed on multiple machines. By default when installing libvirt you get a 'default network' which adds a 'vrbr0'. I found several tutorials online about removing this 'virbr0' but I would like to not have it in the first place. I am compiling libvirt from source so I would think there is some compile time option or some configuration file I need to change for the default network not to be included. Thanks for your help! Andrei -- The information transmitted is intended only for the person or entity to which it is addressed and may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of or taking of any action in reliance upon this information by persons or entities other than the intended recipient is prohibited. If you receive this in error please contact the sender and delete the material from any computer immediately. It is the policy of Klas Limited to disavow the sending of offensive material and should you consider that the material contained in the message is offensive you should contact the sender immediately and also your I.T. Manager. Klas Telecom Inc., a Virginia Corporation with offices at 1101 30th St. NW, Washington, DC 20007. Klas Limited (Company Number 163303) trading as Klas Telecom, an Irish Limited Liability Company, with its registered office at Fourth Floor, One Kilmainham Square, Inchicore Road, Kilmainham, Dublin 8, Ireland.
On Wed, 2016-03-09 at 14:15 +0000, Andrei Perietanu wrote:
I am building a custom Linux image which includes KVM and will be installed on multiple machines. By default when installing libvirt you get a 'default network' which adds a 'vrbr0'. I found several tutorials online about removing this 'virbr0' but I would like to not have it in the first place.
I am compiling libvirt from source so I would think there is some compile time option or some configuration file I need to change for the default network not to be included.
It should be enough to run # virsh net-autostart --disable default or delete /etc/libvirt/qemu/networks/autostart/default.xml after installation. You can also run # virsh net-undefine default or delete /etc/libvirt/qemu/networks/default.xml if you are sure you're never going to need the default network. Cheers. -- Andrea Bolognani Software Engineer - Virtualization Team
On Wed, Mar 9, 2016 at 2:49 PM, Andrea Bolognani <abologna@redhat.com> wrote:
On Wed, 2016-03-09 at 14:15 +0000, Andrei Perietanu wrote:
I am building a custom Linux image which includes KVM and will be installed on multiple machines. By default when installing libvirt you get a 'default network' which adds a 'vrbr0'. I found several tutorials online about removing this 'virbr0' but I would like to not have it in the first place.
I am compiling libvirt from source so I would think there is some compile time option or some configuration file I need to change for the default network not to be included.
It should be enough to run
# virsh net-autostart --disable default
or delete
/etc/libvirt/qemu/networks/autostart/default.xml
after installation. You can also run
# virsh net-undefine default
or delete
/etc/libvirt/qemu/networks/default.xml
if you are sure you're never going to need the default network.
Cheers.
Thanks for the answer, but this does not solve the problem. As I said
I am building an linux image which will be installed on multiple machines. I don't want to have to go to each one and manually disable the default network. I would like to disable it in the image itself so that it's not installed in the first place.
-- Andrea Bolognani Software Engineer - Virtualization Team
-- The information transmitted is intended only for the person or entity to which it is addressed and may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of or taking of any action in reliance upon this information by persons or entities other than the intended recipient is prohibited. If you receive this in error please contact the sender and delete the material from any computer immediately. It is the policy of Klas Limited to disavow the sending of offensive material and should you consider that the material contained in the message is offensive you should contact the sender immediately and also your I.T. Manager. Klas Telecom Inc., a Virginia Corporation with offices at 1101 30th St. NW, Washington, DC 20007. Klas Limited (Company Number 163303) trading as Klas Telecom, an Irish Limited Liability Company, with its registered office at Fourth Floor, One Kilmainham Square, Inchicore Road, Kilmainham, Dublin 8, Ireland.
On Wed, 2016-03-09 at 14:53 +0000, Andrei Perietanu wrote:
On Wed, Mar 9, 2016 at 2:49 PM, Andrea Bolognani <abologna@redhat.com> wrote:
On Wed, 2016-03-09 at 14:15 +0000, Andrei Perietanu wrote:
I am building a custom Linux image which includes KVM and will be installed on multiple machines. By default when installing libvirt you get a 'default network' which adds a 'vrbr0'. I found several tutorials online about removing this 'virbr0' but I would like to not have it in the first place.
I am compiling libvirt from source so I would think there is some compile time option or some configuration file I need to change for the default network not to be included.
It should be enough to run
# virsh net-autostart --disable default
or delete
/etc/libvirt/qemu/networks/autostart/default.xml
after installation. You can also run
# virsh net-undefine default
or delete
/etc/libvirt/qemu/networks/default.xml
if you are sure you're never going to need the default network. Thanks for the answer, but this does not solve the problem. As I said I am building an linux image which will be installed on multiple machines. I don't want to have to go to each one and manually disable the default network. I would like to disable it in the image itself so that it's not installed in the first place.
Not shipping either just the first file mentioned or both of them in your image should do the trick. Cheers. -- Andrea Bolognani Software Engineer - Virtualization Team
On Wed, Mar 9, 2016 at 3:05 PM, Andrea Bolognani <abologna@redhat.com> wrote:
On Wed, 2016-03-09 at 14:53 +0000, Andrei Perietanu wrote:
On Wed, Mar 9, 2016 at 2:49 PM, Andrea Bolognani <abologna@redhat.com>
wrote:
On Wed, 2016-03-09 at 14:15 +0000, Andrei Perietanu wrote:
I am building a custom Linux image which includes KVM and will be installed on multiple machines. By default when installing libvirt you get a 'default network' which adds a 'vrbr0'. I found several tutorials online about removing this 'virbr0' but I would like to not have it in the first place.
I am compiling libvirt from source so I would think there is some compile time option or some configuration file I need to change for the default network not to be included.
It should be enough to run
# virsh net-autostart --disable default
or delete
/etc/libvirt/qemu/networks/autostart/default.xml
after installation. You can also run
# virsh net-undefine default
or delete
/etc/libvirt/qemu/networks/default.xml
if you are sure you're never going to need the default network.
Thanks for the answer, but this does not solve the problem. As I said I am building an linux image which will be installed on multiple machines. I don't want to have to go to each one and manually disable the default network. I would like to disable it in the image itself so that it's not installed in the first place.
Not shipping either just the first file mentioned or both of them in your image should do the trick.
Cheers.
-- Andrea Bolognani Software Engineer - Virtualization Team
Not shipping default.xml is easier said then done; even if I remove it from the output build folder is still end's up being installed on the target machine once the linux image is extracted. Libvirt must store it somewhere internally but I can't figure out how to get rid of it. Thanks, Andrei -- The information transmitted is intended only for the person or entity to which it is addressed and may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of or taking of any action in reliance upon this information by persons or entities other than the intended recipient is prohibited. If you receive this in error please contact the sender and delete the material from any computer immediately. It is the policy of Klas Limited to disavow the sending of offensive material and should you consider that the material contained in the message is offensive you should contact the sender immediately and also your I.T. Manager. Klas Telecom Inc., a Virginia Corporation with offices at 1101 30th St. NW, Washington, DC 20007. Klas Limited (Company Number 163303) trading as Klas Telecom, an Irish Limited Liability Company, with its registered office at Fourth Floor, One Kilmainham Square, Inchicore Road, Kilmainham, Dublin 8, Ireland.
I do something similar, generating a custom image that gets installed on multiple systems. I just have a startup script in my image that runs "virsh net-undefine default" during boot-up. If you are creating your own image, you should be able to insert something similar in your start-up process. Peter On 03/09/2016 07:19 AM, Andrei Perietanu wrote:
On Wed, Mar 9, 2016 at 3:05 PM, Andrea Bolognani <abologna@redhat.com <mailto:abologna@redhat.com>> wrote:
On Wed, 2016-03-09 at 14:53 +0000, Andrei Perietanu wrote: > > On Wed, Mar 9, 2016 at 2:49 PM, Andrea Bolognani <abologna@redhat.com <mailto:abologna@redhat.com>> wrote: > > On Wed, 2016-03-09 at 14:15 +0000, Andrei Perietanu wrote: > > > I am building a custom Linux image which includes KVM and will be installed on multiple machines. By default when > > > installing libvirt you get a 'default network' which adds a 'vrbr0'. > > > I found several tutorials online about removing this 'virbr0' but I would like to not have it in the first place. > > > > > > I am compiling libvirt from source so I would think there is some compile time option or some configuration file I > > > need to change for the default network not to be included. > > > > It should be enough to run > > # virsh net-autostart --disable default > > or delete > > /etc/libvirt/qemu/networks/autostart/default.xml > > after installation. You can also run > > # virsh net-undefine default > > or delete > > /etc/libvirt/qemu/networks/default.xml > > if you are sure you're never going to need the > default network. > > Thanks for the answer, but this does not solve the problem. As I said I am building an linux image which will be > installed on multiple machines. I don't want to have to go to each one and manually disable the default network. I > would like to disable it in the image itself so that it's not installed in the first place.
Not shipping either just the first file mentioned or both of them in your image should do the trick.
Cheers.
-- Andrea Bolognani Software Engineer - Virtualization Team
Not shipping default.xml is easier said then done; even if I remove it from the output build folder is still end's up being installed on the target machine once the linux image is extracted. Libvirt must store it somewhere internally but I can't figure out how to get rid of it.
Thanks, Andrei
The information transmitted is intended only for the person or entity to which it is addressed and may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of or taking of any action in reliance upon this information by persons or entities other than the intended recipient is prohibited. If you receive this in error please contact the sender and delete the material from any computer immediately. It is the policy of Klas Limited to disavow the sending of offensive material and should you consider that the material contained in the message is offensive you should contact the sender immediately and also your I.T. Manager.
Klas Telecom Inc., a Virginia Corporation with offices at 1101 30th St. NW, Washington, DC 20007.
Klas Limited (Company Number 163303) trading as Klas Telecom, an Irish Limited Liability Company, with its registered office at Fourth Floor, One Kilmainham Square, Inchicore Road, Kilmainham, Dublin 8, Ireland.
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On Wed, 2016-03-09 at 15:19 +0000, Andrei Perietanu wrote:
Not shipping either just the first file mentioned or both of them in your image should do the trick.
Not shipping default.xml is easier said then done; even if I remove it from the output build folder is still end's up being installed on the target machine once the linux image is extracted. Libvirt must store it somewhere internally but I can't figure out how to get rid of it.
I have no idea how you're building your image, but removing those files on my system yields the expected result so I'm pretty confident libvirt is not picking up the network configuration from anywhere else. Unless of course you are using a session instance and have a network defined in your home directory. In Fedora, the default network is even shipped in a separate package, libvirt-daemon-config-network: the package contains /usr/share/libvirt/networks/default.xml and its %post script copies it over to /etc to actually enable the network. Cheers. -- Andrea Bolognani Software Engineer - Virtualization Team
On 03/09/2016 09:53 AM, Andrei Perietanu wrote:
On Wed, Mar 9, 2016 at 2:49 PM, Andrea Bolognani <abologna@redhat.com <mailto:abologna@redhat.com>> wrote:
On Wed, 2016-03-09 at 14:15 +0000, Andrei Perietanu wrote: > I am building a custom Linux image which includes KVM and will be installed on multiple machines. By default when > installing libvirt you get a 'default network' which adds a 'vrbr0'. > I found several tutorials online about removing this 'virbr0' but I would like to not have it in the first place. > > I am compiling libvirt from source so I would think there is some compile time option or some configuration file I > need to change for the default network not to be included.
It should be enough to run
# virsh net-autostart --disable default
or delete
/etc/libvirt/qemu/networks/autostart/default.xml
after installation. You can also run
# virsh net-undefine default
or delete
/etc/libvirt/qemu/networks/default.xml
if you are sure you're never going to need the default network.
Cheers.
Thanks for the answer, but this does not solve the problem. As I said I am building an linux image which will be installed on multiple machines. I don't want to have to go to each one and manually disable the default network. I would like to disable it in the image itself so that it's not installed in the first place.
This is why libvirt has been split into many smaller subpackages. Just setup your image to not install the package called "libvirt-daemon-config-network" and the default network (and thus virbr0) will never be created. (This assumes that your distro uses the same packaging setup as RHEL/Fedora/CentOS). (the "libvirt" package itself is just a meta-package that includes a bunch of the other smaller packages).
On Wed, 2016-03-09 at 14:39 -0500, Laine Stump wrote:
This is why libvirt has been split into many smaller subpackages. Just setup your image to not install the package called "libvirt-daemon-config-network" and the default network (and thus virbr0) will never be created. (This assumes that your distro uses the same packaging setup as RHEL/Fedora/CentOS).
He's building libvirt from source though, see the first message :) Cheers. -- Andrea Bolognani Software Engineer - Virtualization Team
participants (4)
-
Andrea Bolognani -
Andrei Perietanu -
Laine Stump -
Peter Steele