Network architecture¶
Although Ansible automates most deployment operations, networking on target hosts requires manual configuration because it varies from one use case to another. This section describes the network configuration that must be implemented on all target hosts.
For more information about how networking works, see Appendix E: Container networking.
Host network bridges¶
OpenStack-Ansible uses bridges to connect physical and logical network interfaces on the host to virtual network interfaces within containers. Target hosts are configured with the following network bridges.
LXC internal:
lxcbr0The
lxcbr0bridge is required, but OpenStack-Ansible configures it automatically. It provides external (typically Internet) connectivity to containers.This bridge does not directly attach to any physical or logical interfaces on the host because iptables handles connectivity. It attaches to
eth0in each container.The container network that the bridge attaches to is configurable in the
openstack_user_config.ymlfile in theprovider_networksdictionary.Container management:
br-mgmtThe
br-mgmtbridge is required. It provides management of and communication between the infrastructure and OpenStack services.The bridge attaches to a physical or logical interface, typically a
bond0VLAN subinterface. It also attaches toeth1in each container.The container network interface that the bridge attaches to is configurable in the
openstack_user_config.ymlfile.Storage:
br-storageThe
br-storagebridge is optional, but recommended for production environments. It provides segregated access to Block Storage devices between OpenStack services and Block Storage devices.The bridge attaches to a physical or logical interface, typically a
bond0VLAN subinterface. It also attaches toeth2in each associated container.The container network interface that the bridge attaches to is configurable in the
openstack_user_config.ymlfile.OpenStack Networking tunnel:
br-vxlanThe
br-vxlanbridge is required if the environment is configured to allow projects to create virtual networks. It provides the interface for virtual (VXLAN) tunnel networks.The bridge attaches to a physical or logical interface, typically a
bond1VLAN subinterface. It also attaches toeth10in each associated container.The container network interface it attaches to is configurable in the
openstack_user_config.ymlfile.OpenStack Networking provider:
br-vlanThe
br-vlanbridge is required. It provides infrastructure for VLAN tagged or flat (no VLAN tag) networks.The bridge attaches to a physical or logical interface, typically
bond1. It attaches toeth11for VLAN type networks in each associated container. It is not assigned an IP address because it handles only layer 2 connectivity.The container network interface that the bridge attaches to is configurable in the
openstack_user_config.ymlfile.
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