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docs: Update README to show iptables fix

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Dalton Hubble
2015-12-09 15:22:04 -08:00
parent 95c9814a0f
commit a6b090a8ae
2 changed files with 18 additions and 9 deletions
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9
README.md
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@@ -32,6 +32,15 @@ Finally, run the `vethdhcp` to create a virtual ethernet connection on the `dock
make run-dhcp
If you get an "address is already in use" error, try stopping the `default` network created in virt-manager. If you find that the `docker0` bridge receives DHCP Offers from dnsmasq, but the VM does not you may need to change an iptables rule.
$ ip tables -L -t nat
$ iptables -t nat -R POSTROUTING 1 -s 172.17.0.0/16 ! -d 172.17.0.0/16 -j MASQUERADE
POSTROUTING
MASQUERADE all -- 172.17.0.0/16 0.0.0.0/0 (Original Rule 1)
MASQUERADE all -- 172.17.0.0/16 !172.17.0.0/16 (Updated Rule 1)
Create a PXE boot client VM using virt-manager as described above. Let the VM PXE boot using the boot config determined the MAC address to config mapping set in the config service.
## Clients

18
scripts/vethdhcp
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@@ -12,15 +12,15 @@ LEASE_TIME=30m
# create and attach the veth if it is missing
if ! ip link show $VETH; then
# create a virtual ethernet device (veth pair)
ip link add $VETH type veth peer name ${VETH}_b
# attach the "b" side of the veth to the bridge
brctl addif $BRIDGE ${VETH}_b
# assign an IP address to the veth
ip addr add $VETH_ADDR dev $VETH
# set both links to be up
ip link set $VETH up
ip link set $VETH_b up
# create a virtual ethernet device (veth pair)
ip link add $VETH type veth peer name ${VETH}_b
# attach the "b" side of the veth to the bridge
brctl addif $BRIDGE ${VETH}_b
# assign an IP address to the veth
ip addr add $VETH_ADDR dev $VETH
# set both links to be up
ip link set $VETH up
ip link set $VETH_b up
fi
dnsmasq --no-daemon --port=0 -i $VETH --dhcp-range=$ADDR_RANGE_START,$ADDR_RANGE_END,$LEASE_TIME