add second IP addresss

Ref Ref

# create new low priority config file
cat <<EOF > /etc/network/interfaces.d/100-cloud-init
iface eth0 inet static
    address XXX.YY.ZZZ.AAA/24

challenges

old or new style

Two gateway problem

Don't use two gateway

test ifup

ifup --no-act eth0

The output:

/bin/run-parts --exit-on-error /etc/network/if-pre-up.d

/sbin/ip addr add AAA.BB.CCC.DDD/255.255.255.0 broadcast AAA.BB.CCC.255 dev eth0 label eth0
/sbin/ip link set dev eth0 up
/sbin/ip route add default via AAA.BB.CCC.DDD dev eth0 onlink

/bin/run-parts --exit-on-error /etc/network/if-up.d

flags

--force: Force configuration or deconfiguration of the interface. --ignore-errors: If any of the commands of scripts fails, continue --no-act: Don't configure any interfaces or run any "up" or "down" commands.