Modified setup-interfaces to create simple bridges (works only with
one interface per bridge). Useful when setting up a Xen system, since
interfaces need to be bridged in order for guests to have networking.
Some distributions automatically create one bridge for each interface
when Xen is installed, but I think this is too aggressive.
Changes since v1:
* Only ask to bridge interfaces if Xen Dom0 is detected
---
libalpine.sh.in | 9 +++++++++
setup-interfaces.in | 49 +++++++++++++++++++++++++++++++++++++++++++++----
2 files changed, 54 insertions(+), 4 deletions(-)
diff --git a/libalpine.sh.in b/libalpine.sh.in
index 36d2a93..8661643 100755
--- a/libalpine.sh.in
+++ b/libalpine.sh.in
@@ -106,4 +106,13 @@ askpassword() {
IFS=$_oifs
}
+# Detect if we are running Xen
+is_xen() {
+ test -d /proc/xen
+}
+# Detect if we are running Xen Dom0
+is_xen_dom0() {
+ is_xen && \
+ grep -q "control_d" /proc/xen/capabilities
+}
diff --git a/setup-interfaces.in b/setup-interfaces.in
index b461529..aee2e83 100755
--- a/setup-interfaces.in
+++ b/setup-interfaces.in
@@ -5,6 +5,7 @@ PREFIX=
. $PREFIX/lib/libalpine.sh
+bridges=""
detect_interfaces() {
ip addr | grep -v ' lo:' | awk -F : '/^[0-9]*:/ { print $2}'
@@ -42,7 +43,30 @@ config_iface() {
local address
local netmask
local gateway
+ local bridge
local conf=$prefix$iface.conf
+ local answer
+
+ if is_xen_dom0; then
+ while [ "$answer" != "yes" ] && [ "$answer" != "no" ] ; do
+ echon "Do you want to bridge the interface $iface? [no] "
+ default_read answer no
+ done
+ else
+ answer="no"
+ fi
+
+ if [ "$answer" = "yes" ]; then
+ bridge="br"`echo $iface | sed 's/[^0-9]//g'`
+ while [ 1 ]; do
+ echon "Name of the bridge you would like to create: [$bridge] "
+ default_read bridge $bridge
+ `echo "$bridges" | grep -q "$bridge"` || break
+ echo "Name already in use, please choose another one"
+ done
+ echo "bridge=${bridge}" > $conf
+ bridges="$bridges $bridge"
+ fi
# use ipcalc to validate the address. we do accept /mask
# we are no interested in the result, only error code, so
@@ -55,7 +79,7 @@ config_iface() {
[ "$address" = "abort" ] && return
if [ "$address" = "dhcp" ] ; then
HAS_DHCP=yes
- echo "type=dhcp" > $conf
+ echo "type=dhcp" >> $conf
rm $iface.noconf
return
fi
@@ -87,7 +111,7 @@ config_iface() {
[ -z "$gateway" ] && break
done
- echo "type=static" > $conf
+ echo "type=static" >> $conf
echo "address=${address%%/*}" >> $conf #strip off /mask if there
echo "netmask=$netmask" >> $conf
echo "gateway=$gateway" >> $conf
@@ -146,8 +170,20 @@ prompt_for_interfaces() {
iface=`basename $i .conf`
iface=${iface#[0-9]*~}
. ./$i
- echo "auto $iface" >> interfaces
- echo "iface $iface inet $type" >> interfaces
+ if [ -n "$bridge" ]; then
+ echo "auto $iface $bridge" >> interfaces
+ echo "" >> interfaces
+ echo "iface $iface inet manual" >> interfaces
+ echo -e "\tup ip link set \$IFACE up" >> interfaces
+ echo -e "\tdown ip link set \$IFACE down" >> interfaces
+ echo "" >> interfaces
+ echo "iface $bridge inet $type" >> interfaces
+ echo -e "\tpre-up brctl addbr $bridge" >> interfaces
+ echo -e "\tpre-up brctl addif $bridge $iface" >> interfaces
+ else
+ echo "auto $iface" >> interfaces
+ echo "iface $iface inet $type" >> interfaces
+ fi
case $type in
dhcp)
[ -n "$hostname" ] \
@@ -160,7 +196,12 @@ prompt_for_interfaces() {
&& echo -e "\tgateway $gateway" >> interfaces
;;
esac
+ if [ -n "$bridge" ]; then
+ echo -e "\tpost-down brctl delif $bridge $iface" >> interfaces
+ echo -e "\tpost-down brctl delbr $bridge" >> interfaces
+ fi
echo "" >> interfaces
+ bridge=""
done
while [ "$answer" != "yes" ] && [ "$answer" != "no" ] ; do
--
1.7.7.1
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On Fri, 30 Dec 2011 10:51:38 +0100
Roger Pau Monne <roger.pau@entel.upc.edu> wrote:
> Modified setup-interfaces to create simple bridges (works only with
> one interface per bridge). Useful when setting up a Xen system, since
> interfaces need to be bridged in order for guests to have networking.
> Some distributions automatically create one bridge for each interface
> when Xen is installed, but I think this is too aggressive.
>
> Changes since v1:
>
> * Only ask to bridge interfaces if Xen Dom0 is detected
> ---
> libalpine.sh.in | 9 +++++++++
> setup-interfaces.in | 49
> +++++++++++++++++++++++++++++++++++++++++++++---- 2 files changed, 54
> insertions(+), 4 deletions(-)
applied.
I also added a -b option so you can do: setup-interfaces -b and get
question about bridge.
Thanks!
-nc
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