OpenVSwitch

2016-02-02T02:02:10Z

Max-k:

[[Category:Networking]]
This document describes how to configure an OpenVSwitch in Alpine Linux.

== Installing OVS ==

<pre>
apk add openvswitch
rc-update add ovs-modules
rc-update add ovsdb-server
rc-update add ovs-vswitchd
rc-service ovs-modules start
rc-service ovsdb-server start
rc-service ovs-vswitchd start
</pre>

== Using ovs-vsctl ==
Open VSwithes are manually managed with the '''ovs-vsctl''' command.

To manually create a switch named "lan":
{{Cmd|ovs-vsctl add-br lan}}

To add interface eth0 to the switch "lan":
{{Cmd|ovs-vsctl add-port lan eth0}}

Note that you need to set the link status to ''up'' on the added interfaces.
{{Cmd|ip link set dev eth0 up}}

To see what OVS are defined:
{{Cmd|ovs-vsctl list-br}}

To see what interfaces are linked to the lan OVS:
{{Cmd|ovs-vsctl list-ports lan}}

To enable spanning tree (if needed):
{{Cmd|1=ovs-vsctl set bridge lan stp_enable=true}}

LACP Timer setting 'fast' mode:
{{Cmd|1=ovs-vsctl set port bond0 other_config:lacp-time=fast}}

== Using OVS appctl ==
ovs-appctl lacp/show bond0

== Configuration file ==

configured in ''/etc/network/interfaces''

<pre>
auto eth0 lan
iface eth0 inet manual
up ifconfig eth0 0.0.0.0 up
down ifconfig eth0 down

iface lan inet dhcp
</pre>

== OVS and qemu ==

=== Helper scripts ===

ovs-ifup-
<pre>
#!/bin/sh
switch=$(echo $0|/usr/bin/cut -d- -f3)
[ -z ${switch} ] && echo "Please define some symlink with suffix to use." && exit 1
[ $# -lt 1 ] && echo "Too few params. Must be 1 and is $#." && exit 2
/sbin/ifconfig $1 0.0.0.0 up
ovs-vsctl add-port ${switch} $1
logger "qemu: $1 added to ${switch} at startup of VM"
</pre>

ovs-ifdown-
<pre>
#!/bin/sh
switch=$(echo $0|/usr/bin/cut -d- -f3)
[ -z ${switch} ] && echo "Please define some symlink with suffix to use." && exit 1
[ $# -lt 1 ] && echo "Too few params. Must be 1 and is $#." && exit 2
/sbin/ifconfig $1 0.0.0.0 down
ovs-vsctl del-port ${switch} $1
logger "qemu: $1 removed from ${switch} at shutdown of VM"
</pre>

== OVS and LXC ==

=== Helper scripts ===

lxc-ovs-ifdown-
<pre>
#!/bin/sh
switch=$(echo $0|/usr/bin/cut -d- -f4)
[ -z ${switch} ] && echo "Please define some symlink with suffix to use." && return 1
[ $# -lt 5 ] && echo "Too few params. Must be 5 and is $#." && exit 2
nic=$5
/usr/bin/ovs-vsctl del-port ${switch} ${nic}
/usr/bin/logger "lxc: ${nic} removed from ${switch} at shutdown of VM."
</pre>

== Caveats ==

Beware to have OVS package files available with no hassle at next reboot! this ca be a problem when running from ram with no cache...

Alpine Linux - User contributions [en]

OpenVSwitch