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Red Hat network scripts integration

The RPM packages for Open vSwitch provide some integration with Red Hat's network scripts. Using this integration is optional.

To use the integration for a Open vSwitch bridge or interface named <name>, create or edit /etc/sysconfig/network-scripts/ifcfg-<name>. This is a shell script that consists of a series of VARIABLE=VALUE assignments. The following OVS-specific variable names are supported:

DEVICETYPE
Always set to "ovs".
TYPE

If this is "OVSBridge", then this file represents an OVS bridge named <name>. Otherwise, it represents a port on an OVS bridge and TYPE must have one of the following values:

  • OVSPort, if <name> is a physical port (e.g. eth0) or virtual port (e.g. vif1.0).
  • OVSIntPort, if <name> is an internal port (e.g. a tagged VLAN).
  • OVSBond, if <name> is an OVS bond.
  • OVSTunnel, if <name> is an OVS tunnel.
  • OVSPatchPort, if <name> is a patch port

Additionally the following DPDK port types may be available, depends on OVS build- and runtime configuration:

  • OVSDPDKPort, if <name> is a physical DPDK NIC port (name must start with dpdk and end with portid, eg dpdk0)
  • OVSDPDKRPort, if <name> is a DPDK ring port (name must start with dpdkr and end with portid, e.g. dpdkr0)
  • OVSDPDKVhostUserPort if <name> is a DPDK vhost-user port
  • OVSDPDKBond if <name> is an OVS DPDK bond.
OVS_BRIDGE
If TYPE is anything other than "OVSBridge", set to the name of the OVS bridge to which the port should be attached.
OVS_OPTIONS
Optionally, extra options to set in the "Port" table when adding the port to the bridge, as a sequence of column[:key]=value options. For example, "tag=100" to make the port an access port for VLAN 100. See the documentation of "add-port" in ovs-vsctl(8) for syntax and the section on the Port table in ovs-vswitchd.conf.db(5) for available options.
OVS_EXTRA
Optionally, additional ovs-vsctl commands, separated by -- (double dash).
BOND_IFACES
For "OVSBond" and "OVSDPDKBond" interfaces, a list of physical interfaces to bond together.
OVS_TUNNEL_TYPE
For "OVSTunnel" interfaces, the type of the tunnel. For example, "gre", "vxlan", etc.
OVS_TUNNEL_OPTIONS
For "OVSTunnel" interfaces, this field should be used to specify the tunnel options like remote_ip, key, etc.
OVS_PATCH_PEER
For "OVSPatchPort" devices, this field specifies the patch's peer on the other bridge.

Note

  • ifdown on a bridge will not bring individual ports on the bridge down. "ifup" on a bridge will not add ports to the bridge. This behavior should be compatible with standard bridges (with TYPE=Bridge).
  • If ifup on an interface is called multiple times, one can see RTNETLINK answers: File exists printed on the console. This comes from ifup-eth trying to add zeroconf route multiple times and is harmless.

Examples

Standalone bridge:

==> ifcfg-ovsbridge0 <==
DEVICE=ovsbridge0
ONBOOT=yes
DEVICETYPE=ovs
TYPE=OVSBridge
BOOTPROTO=static
IPADDR=A.B.C.D
NETMASK=X.Y.Z.0
HOTPLUG=no

Enable DHCP on the bridge:

  • Needs OVSBOOTPROTO instead of BOOTPROTO.
  • All the interfaces that can reach the DHCP server as a space separated list in OVSDHCPINTERFACES.
DEVICE=ovsbridge0
ONBOOT=yes
DEVICETYPE=ovs
TYPE=OVSBridge
OVSBOOTPROTO="dhcp"
OVSDHCPINTERFACES="eth0"
HOTPLUG=no

Adding Internal Port to ovsbridge0:

==> ifcfg-intbr0 <==
DEVICE=intbr0
ONBOOT=yes
DEVICETYPE=ovs
TYPE=OVSIntPort
OVS_BRIDGE=ovsbridge0
HOTPLUG=no

Internal Port with fixed IP address:

DEVICE=intbr0
ONBOOT=yes
DEVICETYPE=ovs
TYPE=OVSIntPort
OVS_BRIDGE=ovsbridge0
BOOTPROTO=static
IPADDR=A.B.C.D
NETMASK=X.Y.Z.0
HOTPLUG=no

Internal Port with DHCP:

  • Needs OVSBOOTPROTO or BOOTPROTO.
  • All the interfaces that can reach the DHCP server as a space separated list in OVSDHCPINTERFACES.
DEVICE=intbr0
ONBOOT=yes
DEVICETYPE=ovs
TYPE=OVSIntPort
OVS_BRIDGE=ovsbridge0
OVSBOOTPROTO="dhcp"
OVSDHCPINTERFACES="eth0"
HOTPLUG=no

Adding physical eth0 to ovsbridge0 described above:

==> ifcfg-eth0 <==
DEVICE=eth0
ONBOOT=yes
DEVICETYPE=ovs
TYPE=OVSPort
OVS_BRIDGE=ovsbridge0
BOOTPROTO=none
HOTPLUG=no

Tagged VLAN interface on top of ovsbridge0:

==> ifcfg-vlan100 <==
DEVICE=vlan100
ONBOOT=yes
DEVICETYPE=ovs
TYPE=OVSIntPort
BOOTPROTO=static
IPADDR=A.B.C.D
NETMASK=X.Y.Z.0
OVS_BRIDGE=ovsbridge0
OVS_OPTIONS="tag=100"
OVS_EXTRA="set Interface $DEVICE external-ids:iface-id=$(hostname -s)-$DEVICE-vif"
HOTPLUG=no

Bonding:

==> ifcfg-bond0 <==
DEVICE=bond0
ONBOOT=yes
DEVICETYPE=ovs
TYPE=OVSBond
OVS_BRIDGE=ovsbridge0
BOOTPROTO=none
BOND_IFACES="gige-1b-0 gige-1b-1 gige-21-0 gige-21-1"
OVS_OPTIONS="bond_mode=balance-tcp lacp=active"
HOTPLUG=no

==> ifcfg-gige-* <==
DEVICE=gige-*
ONBOOT=yes
HOTPLUG=no

An Open vSwitch Tunnel:

==> ifcfg-gre0 <==
DEVICE=ovs-gre0
ONBOOT=yes
DEVICETYPE=ovs
TYPE=OVSTunnel
OVS_BRIDGE=ovsbridge0
OVS_TUNNEL_TYPE=gre
OVS_TUNNEL_OPTIONS="options:remote_ip=A.B.C.D"

Patch Ports:

==> ifcfg-patch-ovs-0 <==
DEVICE=patch-ovs-0
ONBOOT=yes
DEVICETYPE=ovs
TYPE=OVSPatchPort
OVS_BRIDGE=ovsbridge0
OVS_PATCH_PEER=patch-ovs-1

==> ifcfg-patch-ovs-1 <==
DEVICE=patch-ovs-1
ONBOOT=yes
DEVICETYPE=ovs
TYPE=OVSPatchPort
OVS_BRIDGE=ovsbridge1
OVS_PATCH_PEER=patch-ovs-0

User bridge:

==> ifcfg-obr0 <==
DEVICE=obr0
ONBOOT=yes
DEVICETYPE=ovs
TYPE=OVSUserBridge
BOOTPROTO=static
IPADDR=A.B.C.D
NETMASK=X.Y.Z.0
HOTPLUG=no

DPDK NIC port:

==> ifcfg-dpdk0 <==
DPDK vhost-user port:
DEVICE=dpdk0
ONBOOT=yes
DEVICETYPE=ovs
TYPE=OVSDPDKPort
OVS_BRIDGE=obr0

==> ifcfg-vhu0 <==
DEVICE=vhu0
ONBOOT=yes
DEVICETYPE=ovs
TYPE=OVSDPDKVhostUserPort
OVS_BRIDGE=obr0

==> ifcfg-bond0 <==
DEVICE=bond0
ONBOOT=yes
DEVICETYPE=ovs
TYPE=OVSDPDKBond
OVS_BRIDGE=ovsbridge0
BOOTPROTO=none
BOND_IFACES="dpdk0 dpdk1"
OVS_OPTIONS="bond_mode=active-backup"
HOTPLUG=no

Reporting Bugs

Please report problems to [email protected].