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Simple NVA - Fixes race condition 

Prevents a race condition where the Google agent creates the local route for the LB VIP only after this script has been run
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Simone Ruffilli 2022-12-15 11:02:24 +01:00 committed by GitHub
parent c297d1061f
commit 3e5c0b5ca7
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1 changed files with 15 additions and 13 deletions
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28
modules/cloud-config-container/simple-nva/files/policy_based_routing.sh
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@ -17,16 +17,18 @@
IF_NAME=$1
IP_LB=$(ip r show table local | grep "$IF_NAME proto 66" | cut -f 2 -d " ")
# If there's a load balancer for this IF...
if [ ! -z $IP_LB ]
then
IF_NUMBER=$(echo $IF_NAME | sed -e s/eth//)
IF_GW=$(curl http://metadata.google.internal/computeMetadata/v1/instance/network-interfaces/$IF_NUMBER/gateway -H "Metadata-Flavor: Google")
IF_IP=$(curl http://metadata.google.internal/computeMetadata/v1/instance/network-interfaces/$IF_NUMBER/ip -H "Metadata-Flavor: Google")
IF_NETMASK=$(curl http://metadata.google.internal/computeMetadata/v1/instance/network-interfaces/$IF_NUMBER/subnetmask -H "Metadata-Flavor: Google")
IF_IP_PREFIX=$(/var/run/nva/ipprefix_by_netmask.sh $IF_NETMASK)
grep -qxF "$((200 + $IF_NUMBER)) hc-$IF_NAME" /etc/iproute2/rt_tables || echo "$((200 + $IF_NUMBER)) hc-$IF_NAME" >>/etc/iproute2/rt_tables
ip route add $IF_GW src $IF_IP dev $IF_NAME table hc-$IF_NAME
ip route add default via $IF_GW dev $IF_NAME table hc-$IF_NAME
ip rule add from $IP_LB/32 table hc-$IF_NAME
fi
# Sleep while there's no load balancer IP route for this IF
while [ -z $IP_LB ] ; do
sleep 2
IP_LB=$(ip r show table local | grep "$IF_NAME proto 66" | cut -f 2 -d " ")
done
IF_NUMBER=$(echo $IF_NAME | sed -e s/eth//)
IF_GW=$(curl http://metadata.google.internal/computeMetadata/v1/instance/network-interfaces/$IF_NUMBER/gateway -H "Metadata-Flavor: Google")
IF_IP=$(curl http://metadata.google.internal/computeMetadata/v1/instance/network-interfaces/$IF_NUMBER/ip -H "Metadata-Flavor: Google")
IF_NETMASK=$(curl http://metadata.google.internal/computeMetadata/v1/instance/network-interfaces/$IF_NUMBER/subnetmask -H "Metadata-Flavor: Google")
IF_IP_PREFIX=$(/var/run/nva/ipprefix_by_netmask.sh $IF_NETMASK)
grep -qxF "$((200 + $IF_NUMBER)) hc-$IF_NAME" /etc/iproute2/rt_tables || echo "$((200 + $IF_NUMBER)) hc-$IF_NAME" >>/etc/iproute2/rt_tables
ip route add $IF_GW src $IF_IP dev $IF_NAME table hc-$IF_NAME
ip route add default via $IF_GW dev $IF_NAME table hc-$IF_NAME
ip rule add from $IP_LB/32 table hc-$IF_NAME