Fix macvtap issues and move to network_mode: host

Dockerfile

@@ -1,4 +1,5 @@
-FROM alpine
-RUN apk add qemu-system-x86_64 qemu-modules bash
+FROM ubuntu
+# iproute2 in Alpine linux does not properly handle macvtap interfaces
+RUN apt-get update && apt-get install -y qemu-kvm bash iproute2
 COPY entrypoint.sh /entrypoint.sh
 ENTRYPOINT /entrypoint.sh

README.md

@@ -24,3 +24,13 @@ Insert Jenkins or your favourite CI/CD software SSH public keys into
 `C:\ProgramData\ssh\administrators_authorized_keys` and adjust ACL-s as described
 [here](https://www.concurrency.com/blog/may-2019/key-based-authentication-for-openssh-on-windows)
 Use the resulting virtual machine disk image with this Docker image.
+
+
+# Debugging
+
+If you can't ping the VM from host, make sure bridge mode is used
+on the macvlanX interface:
+
+```
+ip -d link show type macvtap
+```

entrypoint.sh

@@ -2,14 +2,17 @@
 set -x
 set -e
 
-# Create macvlan interface on Docker's eth0
-ip link add link eth0 name macvtap0 type macvtap mode bridge
-ip link set dev macvtap0 address ${MAC:?}
-ip link set macvtap0 up
+PARENT=bond0.1
+MACVTAP=macvtap$OFFSET
+
+! ip link delete $MACVTAP
+ip link add link $PARENT name $MACVTAP type macvtap mode bridge
+ip link set dev $MACVTAP address ${MAC:?}
+ip link set $MACVTAP up
 
 # No udev in Docker
-IFS=: read major minor < <(cat /sys/devices/virtual/net/macvtap0/tap*/dev)
-DEV=/dev/tap$(cat /sys/class/net/macvtap0/ifindex)
+IFS=: read major minor < <(cat /sys/devices/virtual/net/$MACVTAP/tap*/dev)
+DEV=/dev/tap$(cat /sys/class/net/$MACVTAP/ifindex)
 rm -fv $DEV
 mknod $DEV c $major $minor
 
@@ -23,7 +26,8 @@ mknod $DEV c $major $minor
   -drive if=none,id=hd,file=/data/image.bin,snapshot=on,format=raw \
   -device scsi-hd,drive=hd \
   -usb \
-  -device usb-ehci,id=ehci                         \
+  -device usb-ehci,id=ehci \
   -device usb-tablet,bus=usb-bus.0 \
-  -vnc :0 \
-  -netdev tap,id=hostnet0,vhost=on,fd=9 9<>$DEV
+  -netdev tap,id=hostnet0,fd=9 9<>$DEV \
+  -nographic -vga qxl
+#  -vnc :$OFFSET