Public bug reported:
When there are multiple interfaces with their own default gateways, this
could result in asymmetric routing. In order to solve this, policy based
routing would have to be configured.
- There is already support to configure routes in cloud-init, but it misses
ability to specify routing table.
- Need ability to create routing table entries in /etc/iproute2/rt_tables
- Configure routing table lookup for a given network.
Here is a sample configuration:
echo "100 eth0" >> /etc/iproute2/rt_tables
echo "101 eth1" >> /etc/iproute2/rt_tables
auto eth0
iface eth0 inet static
address 10.172.142.37/24
dns-nameservers 10.172.40.1
gateway 10.172.142.253
up ip rule add from 10.172.142.0/24 lookup eth0
up ip route add 10.172.142.0/24 dev eth0 table eth0
up ip route add default via 10.172.142.253 table eth0
auto eth1
iface eth1 inet static
address 10.172.144.56/24
dns-nameservers 10.172.40.1
gateway 10.172.144.253
up ip rule add from 10.172.144.0/24 lookup eth1
up ip route add 10.172.144.0/24 dev eth1 table eth1
up ip route add default via 10.172.144.253 table eth1
** Affects: cloud-init
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1807297
Title:
Add support to configure policy based routing
Status in cloud-init:
New
Bug description:
When there are multiple interfaces with their own default gateways,
this could result in asymmetric routing. In order to solve this,
policy based routing would have to be configured.
- There is already support to configure routes in cloud-init, but it misses
ability to specify routing table.
- Need ability to create routing table entries in /etc/iproute2/rt_tables
- Configure routing table lookup for a given network.
Here is a sample configuration:
echo "100 eth0" >> /etc/iproute2/rt_tables
echo "101 eth1" >> /etc/iproute2/rt_tables
auto eth0
iface eth0 inet static
address 10.172.142.37/24
dns-nameservers 10.172.40.1
gateway 10.172.142.253
up ip rule add from 10.172.142.0/24 lookup eth0
up ip route add 10.172.142.0/24 dev eth0 table eth0
up ip route add default via 10.172.142.253 table eth0
auto eth1
iface eth1 inet static
address 10.172.144.56/24
dns-nameservers 10.172.40.1
gateway 10.172.144.253
up ip rule add from 10.172.144.0/24 lookup eth1
up ip route add 10.172.144.0/24 dev eth1 table eth1
up ip route add default via 10.172.144.253 table eth1
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