root / doc / design-openvswitch.rst @ 7165b450
History | View | Annotate | Download (3.7 kB)
1 | 3771161c | Sebastian Gebhard | ======================== |
---|---|---|---|
2 | 3771161c | Sebastian Gebhard | Support for Open vSwitch |
3 | 3771161c | Sebastian Gebhard | ======================== |
4 | 3771161c | Sebastian Gebhard | |
5 | 3771161c | Sebastian Gebhard | .. contents:: :depth: 3 |
6 | 3771161c | Sebastian Gebhard | |
7 | 3771161c | Sebastian Gebhard | This is a design document detailing the implementation of support for |
8 | 3771161c | Sebastian Gebhard | Open vSwitch in the Ganeti tool chain. |
9 | 3771161c | Sebastian Gebhard | |
10 | 3771161c | Sebastian Gebhard | Current state and shortcomings |
11 | 3771161c | Sebastian Gebhard | ============================== |
12 | 3771161c | Sebastian Gebhard | |
13 | 20029b6e | Sebastian Gebhard | At the moment Ganeti's support for Open vSwitch is very basic and |
14 | 3771161c | Sebastian Gebhard | limited to connecting instances to an existing vSwitch. |
15 | 3771161c | Sebastian Gebhard | |
16 | 3771161c | Sebastian Gebhard | The shortcomings of this approach are: |
17 | 3771161c | Sebastian Gebhard | |
18 | 3771161c | Sebastian Gebhard | 1. The full functionality (VLANs, QoS and trunking) of Open vSwitch is not used. |
19 | 3771161c | Sebastian Gebhard | |
20 | 3771161c | Sebastian Gebhard | 2. Open vSwitch cannot be managed centrally. |
21 | 3771161c | Sebastian Gebhard | |
22 | 3771161c | Sebastian Gebhard | Proposed changes |
23 | 3771161c | Sebastian Gebhard | ---------------- |
24 | 20029b6e | Sebastian Gebhard | 1. Implement functions into gnt-network to manage Open vSwitch through Ganeti gnt-network |
25 | 20029b6e | Sebastian Gebhard | should be able to create, modify and delete vSwitches. The resulting configuration shall |
26 | 3771161c | Sebastian Gebhard | automatically be done on all members of the node group. Connecting Ethernet devices to |
27 | 3771161c | Sebastian Gebhard | vSwitches should be managed through this interface as well. |
28 | 3771161c | Sebastian Gebhard | |
29 | 3771161c | Sebastian Gebhard | 2. Implement VLAN-capabilities: Instances shall have additional information for every NIC: VLAN-ID |
30 | 3771161c | Sebastian Gebhard | and port type. These are used to determine their type of connection to Open vSwitch. This will |
31 | 3771161c | Sebastian Gebhard | require modifying the methods for instance creation and modification |
32 | 3771161c | Sebastian Gebhard | |
33 | 20029b6e | Sebastian Gebhard | 3. Implement NIC bonding: Functions to bond NICs for performance improvement, load-balancing and |
34 | 20029b6e | Sebastian Gebhard | failover should be added. It is preferable to have a configuration option to determine the |
35 | 20029b6e | Sebastian Gebhard | type of the trunk, as there are different types of trunks (LACP dynamic and static, different |
36 | 3771161c | Sebastian Gebhard | failover and load-balancing mechanisms) |
37 | 3771161c | Sebastian Gebhard | |
38 | 20029b6e | Sebastian Gebhard | 4. Set QoS level on per instance basis: Instances shall have an additional information: maximum |
39 | 20029b6e | Sebastian Gebhard | bandwidth and maximum burst. This helps to balance the bandwidth needs between the VMs and to |
40 | 3771161c | Sebastian Gebhard | ensure fair sharing of the bandwidth. |
41 | 3771161c | Sebastian Gebhard | |
42 | 20029b6e | Sebastian Gebhard | Configuration changes for VLANs |
43 | 20029b6e | Sebastian Gebhard | +++++++++++++++++++++++++++++++ |
44 | 20029b6e | Sebastian Gebhard | nicparams shall be extended by a value "vlan" that will store the VLAN information for each NIC. |
45 | 20029b6e | Sebastian Gebhard | This parameter will only be used if nicparams[constants.NIC_MODE] == constants.NIC_MODE_OVS, |
46 | 20029b6e | Sebastian Gebhard | since it doesn't make sense in other modes. |
47 | 20029b6e | Sebastian Gebhard | |
48 | 20029b6e | Sebastian Gebhard | Each VLAN the NIC belongs to shall be stored in this single value. The format of storing this information |
49 | 20029b6e | Sebastian Gebhard | is the same as the one which is used in Xen 4.3, since Xen 4.3 comes with functionality to support |
50 | 20029b6e | Sebastian Gebhard | OpenvSwitch. |
51 | 20029b6e | Sebastian Gebhard | |
52 | 20029b6e | Sebastian Gebhard | This parameter will, at first, only be implemented for Xen and will have no effects on other hypervisors. |
53 | 20029b6e | Sebastian Gebhard | Support for KVM will be added in the future. |
54 | 20029b6e | Sebastian Gebhard | |
55 | 20029b6e | Sebastian Gebhard | Example: |
56 | 20029b6e | Sebastian Gebhard | switch1 will connect the VM to the default VLAN of the switch1. |
57 | 20029b6e | Sebastian Gebhard | switch1.3 means that the VM is connected to an access port of VLAN 3. |
58 | 20029b6e | Sebastian Gebhard | switch1.2:10:20 means that the VM is connected to a trunk port on switch1, carrying VLANs 2, 10 and 20. |
59 | 20029b6e | Sebastian Gebhard | |
60 | 20029b6e | Sebastian Gebhard | This configuration string is split at the dot and stored in nicparams[constants.NIC_LINK] and |
61 | 20029b6e | Sebastian Gebhard | nicparams[constants.NIC_VLAN] respectively. |
62 | 20029b6e | Sebastian Gebhard | |
63 | 20029b6e | Sebastian Gebhard | For Xen hypervisors, this information can be concatenated again and stored in the vif config as |
64 | 20029b6e | Sebastian Gebhard | the bridge parameter and will be fully compatible with vif-openvswitch as of Xen 4.3. |
65 | 20029b6e | Sebastian Gebhard | |
66 | 20029b6e | Sebastian Gebhard | Users of older Xen versions should be able to grab vif-openvswitch from the Xen repo and use it |
67 | 20029b6e | Sebastian Gebhard | (tested in 4.2). |
68 | 20029b6e | Sebastian Gebhard | |
69 | 20029b6e | Sebastian Gebhard | The differentiation between access port and trunk port is given by the number of VLANs that are |
70 | 20029b6e | Sebastian Gebhard | specified. |
71 | 20029b6e | Sebastian Gebhard | |
72 | 20029b6e | Sebastian Gebhard | gnt-instance modify shall be able to add or remove single VLANs from the vlan string without users needing |
73 | 20029b6e | Sebastian Gebhard | to specify the complete new string. |
74 | 20029b6e | Sebastian Gebhard | |
75 | 20029b6e | Sebastian Gebhard | Configuration changes for QoS |
76 | 20029b6e | Sebastian Gebhard | +++++++++++++++++++++++++++++ |
77 | 3771161c | Sebastian Gebhard | Instances shall be extended with configuration options for |
78 | 3771161c | Sebastian Gebhard | |
79 | 3771161c | Sebastian Gebhard | - maximum bandwidth |
80 | 3771161c | Sebastian Gebhard | - maximum burst rate |
81 | 3771161c | Sebastian Gebhard | |
82 | 3771161c | Sebastian Gebhard | New configuration objects need to be created for the Open vSwitch configuration. |
83 | 3771161c | Sebastian Gebhard | |
84 | 3771161c | Sebastian Gebhard | All these configuration changes need to be made available on the whole node group. |
85 | 3771161c | Sebastian Gebhard | |
86 | 3771161c | Sebastian Gebhard | .. vim: set textwidth=72 : |
87 | 3771161c | Sebastian Gebhard | .. Local Variables: |
88 | 3771161c | Sebastian Gebhard | .. mode: rst |
89 | 3771161c | Sebastian Gebhard | .. fill-column: 72 |
90 | 3771161c | Sebastian Gebhard | .. End: |