NetworkManger Creates Extra Bonds; Is This A Bug?

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Hi All,

I see an unexpected beahviour from NetworkManager on CentOS 7.1. Using nmcli tool, I create a bond with two slaves as explained in the Red Hat 7.1 Networking guide. I enable slaves and master; bond works as expected. When I restart NetworkManager, it creates a new bond with the same name but not connected to any device. Two bonds with the same name is confusing for my other monitoring scripts. I’m wondering why a second bond is created? Is it a bug in NetworkManger?

#Create a bond with two slaves nmcli con add autoconnect no type bond con-name bond0 ifname bond0
nmcli con mod bond0 ipv6.method ignore ipv4.method manual ipv4.addresses
${BOND_IP}/${BOND_CIDR} ${BOND_GW} ${BOND_DNS} ${BOND_DNS_SEARCH}
ipv4.never-default no ipv4.ignore-auto-dns no nmcli con add autoconnect no type bond-slave con-name bond-slave-eth0
ifname eth0 master bond0
nmcli con add autoconnect no type bond-slave con-name bond-slave-eth1
ifname eth1 master bond0

#Enable bond nmcli con mod bond-slave-eth0 connection.autoconnect yes nmcli con up bond-slave-eth0

nmcli con mod bond-slave-eth1 connection.autoconnect yes nmcli con up bond-slave-eth1

nmcli con mod bond0 connection.autoconnect yes nmcli con up bond0

systemctl restart NetworkManager systemctl restart iptables

nmcli con | grep bond bond0 9942bdc6-df72-4723-b2ed-47a78e3a5c59 bond bond0
bond-slave-eth0 8b0fbbe1-a7f0-448c-8005-46d11599f57a 802-3-ethernet eth0
bond-slave-eth1 333dd1b9-15a4-4119-8e42-55ac3621a85d 802-3-ethernet eth1
*bond0 460dd9e8-bc0b-473e-9c89-41facda98b66 bond
— # Why this extra bond connections has been created?*

I’d appreciate your comments and suggestions to fix the issue.

Thanks,

Joe

3 thoughts on - NetworkManger Creates Extra Bonds; Is This A Bug?

  • To this day, on EL6, creating bonds always generates a spurious ‘bond0’
    interface with no slaved interfaces. It was reported to red hat bugzilla ages ago but the issue was closed without resolution (sorry, I’ve been looking for the rhbz# but haven’t found it yet).

    digimer

  • Found it:

    https://bugzilla.redhat.com/show_bug.cgi?id=1245440

    ====
    Neil Horman 2015-07-22 14:30:57 EDT

    inserting the bonding module always creates the first bond interface, thats always how its been, and isn’t a bug.

    Status: NEW → CLOSED
    Resolution: — → NOTABUG
    Last Closed: 2015-07-22 14:30:57
    ====

    digimer


    Digimer Papers and Projects: https://alteeve.ca/w/
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