Adding extra network to container¶
In some cases it may be useful to have an ability to add extra network interface for some container group (or just a single container). As an example this can be used for applying known fixed IP address from another network for Designate service. We will show futher configuration based on this example. Let’s assume, that this network is 10.0.20.0/24 which is reachable through br-dns interface.
To add new interface with that network into dessignate containers, we need to
do several actions in
You may find detailed example of openstack_user_config.yml configuration in section openstack_user_config settings reference.
Add this network in
cidr_networks: container: 172.29.236.0/22 tunnel: 172.29.240.0/22 storage: 172.29.244.0/22 designate: 10.0.20.0/24
Describe network in
global_overrides: provider_networks: - network: container_bridge: "br-dns" container_type: "veth" container_interface: "eth5" ip_from_q: "designate" type: "veth" group_binds: - dnsaas_hosts
Define override for containers
Adding gateway key will create default route inside container through it
dnsaas_hosts: aio1: ip: 172.29.236.100 container_vars: container_extra_networks: dns_address: bridge: br-dns interface: eth5 address: 10.0.20.100 netmask: 255.255.255.0 gateway: 10.0.20.1
Using SR-IOV interfaces in containers¶
For some deployments it might be required to passthrough devices directly to containers, for example, when SR-IOV is used or devices can’t be bridged (ie with IPoIB <https://www.kernel.org/doc/html/latest/infiniband/ipoib.html>)
You would need to manually map physical interfaces to specific containers. This also assumes, that same interface name is present on all containers and it is consistent and present before LXC startup.
Below as an example we will try using IB interfaces for storage network
and pass them inside containers that require storage connectivity.
For that you need describe connections in
inside openstack_user_config.yml configuration:
global_overrides: provider_networks: - network: container_bridge: "ib1" container_type: "phys" container_interface: "ib1" ip_from_q: "storage" type: "raw" group_binds: - cinder_volume - network: container_bridge: "ib3" container_type: "phys" container_interface: "ib3" ip_from_q: "storage" type: "raw" group_binds: - glance_api - network: container_bridge: "ib5" container_type: "phys" container_interface: "ib5" ip_from_q: "storage" type: "raw" group_binds: - gnocchi_api