Skip to main content
Version: 2024.1

OpenStack Known Limitations

Take the following under consideration when setting up OpenStack App deployment in CloudShell.

  • OpenStack networking model: OpenStack networking is not a Pure L2 model where ports are attached to switches and VLANs. This is more of an L2/L3 hybrid where each L2 network (broadcast domain) is also associated with an L3 Subnet. In CloudShell, this model is implemented using segmentation ID as VLAN or VxLAN.

  • Access/Trunk VLANs: Currently, only Access mode is supported. In other words, end hosts are not VLAN-aware. VLAN trunking support is not present right now.

  • Attaching VLAN to vNIC: Support for selecting a VLAN to attach to a vNIC does not exist right now due to limitations with the hybrid L2/L3 model.

  • VM access using keypairs: Currently, username/password access to OpenStack instances is supported. Keypairs are currently not supported.

  • Hotplug interfaces: CloudShell uses udev rules for auto detecting interfaces on the deployed OpenStack instances. Therefore, make sure the instance image has udev support and 'cloud-init' installed and enabled. Note that most of the standard cloud images have built-in udev support.

    To use ubuntu images, the 'GNOME NetworkManager' service must be disabled.

  • App network CIDRs: In CloudShell's implementation, support for /24 CIDRs is provided. This might limit the number of supported hosts on a subnet to 255.