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Ubuntu/Debianにおいて再起動無しでLinux Bonding(VLAN-tagged)を構成するための黒魔術

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/etc/network/interfacesを以下のように編集してタグVLANがついたbondインターフェースを構成する場合、一度再起動する必要があると、ずっと思っていた。

$ cat /etc/network/interfaces
auto lo
iface lo inet loopback

auto bond0
iface bond0 inet manual
        mtu 1500
        bond-mode balance-alb
        bond-miimon 100
        bond-slaves em1 em2

auto bond0.1234
iface bond0.1234 inet static
        address 10.x.y.50
        netmask 255.255.255.0
        gateway 10.x.y.1
        network 10.x.y.0
        vlan_raw_device bond0

auto em1
iface em1 inet manual
bond-master bond0

auto em2
iface em2 inet manual
bond-master bond0

1234は、VLANのIDである。

上記のNIC構成の場合、rootユーザで以下のコマンドを打つことで、再起動を避けることが可能である。

$ ifdown bond0 && ifup bond0 && ifup em1 && ifup em2 && ifup bond0.1234
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