virbr0 interface?

[Gustavo Berman]

Hi there!
I don't think this is critical, just curious

I just installed rc0 front end in a KVM VM
There is a virbr0 created with address 192.168.122.0
Also some packages installed for libvirt/qemu, but I didn't installed the KVM roll, and libvirtd.service is up
Any idea why?

[root@rocks7beta ~]# rocks list roll
NAME                     VERSION    ARCH   ENABLED
CentOS:                  7.4.1708   x86_64 yes   
core:                    7.0        x86_64 yes   
fingerprint:             7.0        x86_64 yes   
ganglia:                 7.0        x86_64 yes   
hpc:                     7.0        x86_64 yes   
kernel:                  7.0        x86_64 yes   
perl:                    7.0        x86_64 yes   
python:                  7.0        x86_64 yes   
serf:                    0.8.1      x86_64 yes   
Updates-CentOS-7.4.1708: 2017-11-04 x86_64 yes   
zfs-linux:               0.7.1      x86_64 yes   
base:                    7.0        x86_64 yes   

rocks list host interface
SUBNET  IFACE MAC               IP           NETMASK         MODULE NAME       VLAN OPTIONS CHANNEL
private ens4  52:54:00:FF:BE:33 172.16.0.1   255.255.0.0     ------ rocks7beta ---- ------- -------
public  ens3  52:54:00:09:F5:1F 10.73.25.223 255.255.255.192 ------ rocks7beta ---- ------- -------

[root@rocks7beta ~]# ip add
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN qlen 1
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: ens3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 52:54:00:09:f5:1f brd ff:ff:ff:ff:ff:ff
    inet 10.73.25.223/26 brd 10.73.25.255 scope global ens3
       valid_lft forever preferred_lft forever
    inet6 fe80::5054:ff:fe09:f51f/64 scope link
       valid_lft forever preferred_lft forever
3: ens4: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 52:54:00:ff:be:33 brd ff:ff:ff:ff:ff:ff
    inet 172.16.0.1/16 brd 172.16.255.255 scope global ens4
       valid_lft forever preferred_lft forever
    inet6 fe80::5054:ff:feff:be33/64 scope link
       valid_lft forever preferred_lft forever
4: virbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN qlen 1000
    link/ether 52:54:00:b8:83:7b brd ff:ff:ff:ff:ff:ff
    inet 192.168.122.1/24 brd 192.168.122.255 scope global virbr0
       valid_lft forever preferred_lft forever
5: virbr0-nic: <BROADCAST,MULTICAST> mtu 1500 qdisc pfifo_fast master virbr0 state DOWN qlen 1000
    link/ether 52:54:00:b8:83:7b brd ff:ff:ff:ff:ff:ff

[root@rocks7beta ~]# ip route
default via 10.73.25.194 dev ens3 proto static metric 100
10.73.25.192/26 dev ens3 proto kernel scope link src 10.73.25.223 metric 100
10.73.25.223 via 172.16.0.1 dev ens4 scope link
172.16.0.0/16 dev ens4 proto kernel scope link src 172.16.0.1 metric 100
192.168.122.0/24 dev virbr0 proto kernel scope link src 192.168.122.1
224.0.0.0/24 dev ens4 scope link
255.255.255.255 dev ens4 scope link

[root@rocks7beta ~]# grep -R 192.168.122.1 /etc/
/etc/libvirt/qemu/networks/default.xml:  <ip address='192.168.122.1' netmask='255.255.255.0'>
/etc/libvirt/qemu/networks/autostart/default.xml:  <ip address='192.168.122.1' netmask='255.255.255.0'>
grep: /etc/grub2-efi.cfg: No such file or directory

[Cooper, Trevor]

Gustavo,

This is the default behavior on CentOS 7 server installed with GUI (as the frontend is).

When I last checked libvirt-daemon/qemu-kvm/etc were pulled in by gnome-boxes.

Earlier attempts to remove gnome-boxes triggered removal of a large number of RPMs that were needed though when I just checked today that may no longer be the case.

Perhaps some RPM dependency 'magic' has been resolved.

Just disable/turn-off the services you don't need running.

Trevor

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