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DNS Fallback

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Kroese 2023-04-14 01:52:33 +02:00 committed by GitHub
parent ddcc5bc02d
commit 3898893aae
1 changed files with 27 additions and 20 deletions
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47
network.sh
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@ -14,18 +14,6 @@ set -eu
# Functions # Functions
# ###################################### # ######################################
setupLocalDhcp () {
IP="$2"
MAC="$1"
CIDR="24"
HOSTNAME="QEMU"
# dnsmasq configuration:
DNSMASQ_OPTS="$DNSMASQ_OPTS --dhcp-range=$IP,$IP --dhcp-host=$MAC,,$IP,$HOSTNAME,infinite --dhcp-option=option:netmask,255.255.255.0"
# Create lease file for faster resolve
echo "0 $MAC $IP $HOSTNAME 01:${MAC}" > /var/lib/misc/dnsmasq.leases
chmod 644 /var/lib/misc/dnsmasq.leases
}
# Setup macvtap device to connect later the VM and setup a new macvlan device to connect the host machine to the network # Setup macvtap device to connect later the VM and setup a new macvlan device to connect the host machine to the network
configureNatNetworks () { configureNatNetworks () {
@ -46,7 +34,15 @@ configureNatNetworks () {
#Enable port forwarding flag #Enable port forwarding flag
[[ $(< /proc/sys/net/ipv4/ip_forward) -eq 0 ]] && sysctl -w net.ipv4.ip_forward=1 [[ $(< /proc/sys/net/ipv4/ip_forward) -eq 0 ]] && sysctl -w net.ipv4.ip_forward=1
setupLocalDhcp $VM_NET_MAC $VM_NET_IP CIDR="24"
HOSTNAME="QEMU"
# dnsmasq configuration:
DNSMASQ_OPTS="$DNSMASQ_OPTS --dhcp-range=$VM_NET_IP,$VM_NET_IP --dhcp-host=$VM_NET_MAC,,$VM_NET_IP,$HOSTNAME,infinite --dhcp-option=option:netmask,255.255.255.0"
# Create lease file for faster resolve
echo "0 $VM_NET_MAC $VM_NET_IP $HOSTNAME 01:${VM_NET_MAC}" > /var/lib/misc/dnsmasq.leases
chmod 644 /var/lib/misc/dnsmasq.leases
} }
# ###################################### # ######################################
@ -80,17 +76,28 @@ for nameserver in "${nameservers[@]}"; do
fi fi
done done
DNSMASQ_OPTS="$DNSMASQ_OPTS \ if [ -z $DNS_SERVERS ]; then
--dhcp-option=option:dns-server,$DNS_SERVERS \ DNS_SERVERS="1.1.1.1"
--dhcp-option=option:router,${VM_NET_IP%.*}.1 \ else
--dhcp-option=option:domain-search,$searchdomains \ COMMAS=${DNS_SERVERS//[^,]/}
--dhcp-option=option:domain-name,$domainname" COMMAS=${#COMMAS}
((COMMAS < 1)) && DNS_SERVERS="$DNS_SERVERS,1.1.1.1"
fi
[[ -z $(hostname -d) ]] || DNSMASQ_OPTS="$DNSMASQ_OPTS --dhcp-option=option:domain-name,$(hostname -d)" DNSMASQ_OPTS="$DNSMASQ_OPTS \
--dhcp-option=option:dns-server,$DNS_SERVERS \
--dhcp-option=option:router,${VM_NET_IP%.*}.1"
if [ -n "$searchdomains" -a "$searchdomains" != "." ]; then
DNSMASQ_OPTS="$DNSMASQ_OPTS --dhcp-option=option:domain-search,$searchdomains"
DNSMASQ_OPTS="$DNSMASQ_OPTS --dhcp-option=option:domain-name,$domainname"
else
[[ -z $(hostname -d) ]] || DNSMASQ_OPTS="$DNSMASQ_OPTS --dhcp-option=option:domain-name,$(hostname -d)"
fi
$DNSMASQ $DNSMASQ_OPTS $DNSMASQ $DNSMASQ_OPTS
KVM_NET_OPTS="${KVM_NET_OPTS} -device virtio-net-pci,netdev=hostnet0,mac=${VM_NET_MAC},id=net0" KVM_NET_OPTS="${KVM_NET_OPTS} -device virtio-net-pci,romfile=,netdev=hostnet0,mac=${VM_NET_MAC},id=net0"
# Hack for guest VMs complaining about "bad udp checksums in 5 packets" # Hack for guest VMs complaining about "bad udp checksums in 5 packets"
iptables -A POSTROUTING -t mangle -p udp --dport bootpc -j CHECKSUM --checksum-fill iptables -A POSTROUTING -t mangle -p udp --dport bootpc -j CHECKSUM --checksum-fill